Compressors and vacuum pumps – Safety requirements
Contents
1. 8 2 Leak tightness test for hazardous gases Gas compressors Leak tightness of the gas containing parts of compressors and associated pipelines shall be tested with a pressure between 1 0 and 1 1 times the maximum allowable working pressure Testing for leakage shall be carried out with inert gas air or processed gas under operating conditions The tests may be made during commissioning BSI 1997 8 3 Noise measurements Verification of noise emission values shall be made in accordance with ISO 4871 The measured noise emission values shall be determined in accordance with EN 12076 8 4 Structure of verification Page 17 EN 1012 1 1996 Safety requirement Visual check Function check Measurement Reference to clauses of this standard or to other standards 5 1 1 x x x EN 294 Cutting EN 349 trapping EN 953 5 1 2 x x 8 1 Fluid injection 5 1 3 x x 8 1 Ejection of parts 5 1 4 x x Stability 5 1 5 x Slip trip fall 5 2 x x EN 50014 Electrical safety EN 50081 2 EN 50082 2 5 3 x x EN 563 Thermal safety EN 1127 1 EN 50014 5 4 x EN 12076 Noise 5 5 1 x x Liquid shock 5 5 2 x 8 2 Gases 5 5 3 x Annex B Fire and explosion 5 5 4 x Microbiological substances 5 6 x x EN 61310 1 Ergonomics 5 7 1 x x Energy supply 5 7 2 x x Breaking down 5 7 3 x x Errors of fitting 5 8 1 x Safety system 5 8 2 x x E2. hazards which are unique for specific compressors and which are listed under the relevant headings 4 1 Mechanical hazards Reference to safety requirement 4 1 1 Generally applicable cutting and severing 5 1 1 1 5 8 2 drawing in trapping or entanglement 5 1 1 1 6 3 1 friction or abrasion 5 1 1 1 high pressure fluid injection 5 1 2 1 ejection of parts 5 1 3 loss of stability 5 1 4 1 slip trip and fall 5 1 5 4 1 2 Large compressors drawing in trapping or entanglement 5 1 1 2 7 2 9 4 4 1 3 Portable and skid mounted air compressors trapping and entanglement 7 2 9 1b c high pressure injection 7 2 9 1b c loss of stability 5 1 4 2 7 2 9 1b BSI 1997 Page 5 EN 1012 1 1996 4 2 Electrical hazards 4 2 1 Generally applicable electrical contact direct or indirect 5 2 1 1 electrostatic phenomena 5 2 2 external influences on electrical 5 2 3 equipment 4 2 2 Gas compressors sparks 5 2 2 4 2 3 Portable and skid mounted air compressors electric installation 5 2 1 1 4 3 Thermal hazards 4 3 1 Generally applicable burns or scalds by flames or explosion 5 3 or possible contact by persons with hot or cold materials or surfaces 4 4 Noise 4 4 1 Generally applicable hearing loss and interference with 5 4 1 7 2 4h communication 4 4 2 Construction site compressors environmental disturbance 5 4 2 4 5 Hazards g
3. 7 2 3 Information affecting the application a The media for which the compressor is intended b Inlet intermediate and discharge temperatures c Inlet intermediate and discharge pressures d The maximum pressure ratio e The specification of lubricants and filters concerning quality quantity and recommended frequency of replacement f The specification of hydraulic transmission fluids g Limiting pressures and temperatures of the lubrication system h Limiting ambient conditions i The maximum and if applicable minimum speed j The need to provide pressure relief devices and other protective devices in the case where they are not supplied as part of the compressor k A warning against the use of a compressor in a potentially explosive atmosphere unless it has been specially designed for that purpose and if so information on the precautions to be taken 1 How contaminated condensates are contained effectively and disposed of safely m Information on operation of compressors at an ambient temperature below 0 C precautions to prevent ice and snow interfering with the operation of the machine in particular that pressure relief devices intake air filters of the compressor and of the cooling air may be blocked actions to be taken to prevent freezing of cooling water systems water traps valves and fittings measures to avoid the freezing of accumulations of condensate actions to be
4. Warnings shall be given of the hazards of opening and entering intake ducts 7 3 Service Manual The Service Manual shall identify the work that must be performed by specialist personnel This work is in addition to the routine checks cleaning and replacements identified in 7 2 4g above The Service Manual shall include the same information as on the data plate drawings and diagrams necessary for the routine service and simple repairs list of parts and consumables that need periodic inspection or replacement instructions for fault analysis schedule for periodic inspection and replacement of parts and consumables instructions for routine servicing and simple repairs together with the appropriate safety procedures instructions on how to enable service work and subsequent testing to be carried out safely in multiple compressor installations instructions on how to safely start stop and isolate any unit independently of the other compressors in a multiple installation address of maintenance agent s approved by the manufacturer warning that only one safety function may be put out of service at one time for the purpose of inspection or maintenance and repair NOTE In addition to the Service Manual provided with all machines the manufacturer will have available for his authorized maintenance agents workshop instructions in one language identifying all procedures for ca
5. 1996 Methodology leading to verification procedures DD ENV 1070 1993 Safety of machinery Terminology BS EN 50014 1993 Electrical apparatus for potentially explosive atmospheres General requirements BS EN 50081 Electromagnetic compatibility Generic emission Part 2 1994 Industrial environment BS EN 50082 Electromagnetic compatibility Generic immunity Part 2 1995 Industrial environment BS EN 61310 Safety of machinery Indication marking and actuation Part 1 1995 Requirements for visual auditory and tactile signals BSI 1997 BS EN 1012 1 1997 BS EN 60204 Safety of machinery Electrical equipment of machines EN 60204 1 Part 1 1993 Specification for general requirements ISO 3457 BS EN ISO 3457 1995 Earth moving machinery Guards and shields Definitions and specifications BS 5791 Glossary of terms for compressors pneumatic tools and machines ISO 3857 1 Part 1 1979 General ISO 3857 2 Part 2 1979 Compressors BS 6413 Lubricants industrial oils and related products Class L ISO 6743 3A Part 3 Classification for family D compressors Section 3 1 1988 Air compressors ISO 6743 3B Part 3 Classification for family D compressors Section 3 2 1989 Gas and refrigeration compressors ISO 7000 BS 7324 1990 Guide to graphical symbols for use on equipment Index and synposis Compliance with a British Standard does not of itself confer immunity from lega
6. safety chains for connection to the towing vehicle shall be provided b A portable compressor shall preferably have only one lifting point The lifting bail or bails shall withstand a continuous minimum vertical load of 2 times the machine gross mass see 5 1 4 any load due to change in position caused by differences in machine mass distribution If there is more than one lifting point the safe limits of angles for cables or chains shall be clearly indicated either on the machine or in the Instruction Manual Under the maximum specified load conditions the lifting bail or bails shall sustain no significant permanent deformation c Lashing points shall be provided to allow safe securing to a vehicle on which the compressor may be transported They shall be marked according to annex C 5 7 3 Errors of fitting Valve and valve port design for reciprocating compressors shall be such that no inlet valve can be fitted instead of a discharge valve and that no discharge valve can be wrongly fitted 5 8 Safety related measures and means 5 8 1 Safety systems to monitor and control the compressor 5 8 1 1 Generally applicable After a stop caused by the safety devices restart shall only be possible by an intentional operation of a manual control Intended automatic or remote manual restart after a short term power failure is permitted if no risk for personnel exists and if there are no other fault conditions
7. any copper alloy silver and any silver alloy mercury 2 prohibited materials in presence of acetylene with lime and ammonia impurities aluminium and its alloys magnesium and its alloys zinc and its alloys except brass by only allowing soldering when the width of the gap is less than 0 3 mm and the solder has a content of copper of not more than 37 and of silver of not more than 46 The content of copper and silver together shall not be more than 76 c To limit the hazard due to the flammability of acetylene the following shall be taken into account gas tightness of the compressor protection by avoiding effective electric electrostatic and mechanical sparks discharge from unloading and pressure relief devices vents drainage and leakages connections for purging the compressor system with an inert gas remote operation of isolating and unloading valves which are inside the danger zone 5 5 2 5 High pressure compressors For high pressure lubricated reciprocating compressors the following additional measures shall be taken into consideration design for low compression temperatures and moderate pressure ratios specify the lubricant carefully the incorporation of a gas filter to absorb reactive impurities or impurities having a catalytic action ensure that any lubricant injected into cylinders is free from air bubbles 5 5 2 6 Portable
8. compressor intended for compression of air 3 2 2 oil free air compressor A compressor design in which the compressed air does not come in contact with oil 3 2 3 oil lubricated air compressor A compressor design in which the compressed air may come in contact with oil but excluding oil flooded air compressors 3 2 4 oil flooded air compressor A compressor design in which the compressed air and the oil are mixed 3 2 5 gas compressor A compressor for handling hazardous gases as defined under 3 1 6 3 2 6 oxygen compressor A compressor for handling pure oxygen or oxygen rich mixture of more than 70 mole per cent oxygen 3 2 7 acetylene compressor A compressor intended for handling acetylene 3 2 8 high pressure compressor A compressor for maximum allowable working pressures above 40 bar BSI 1997 3 2 9 low temperature compressor A compressor for continuous handling of media other than air having an inlet temperature below 0 C 3 2 10 large compressor A compressor with an input shaft power above 1000 kW 3 2 11 portable compressor A compressor which is wheel mounted and can be towed 3 2 12 skid mounted compressor A compressor which is mounted on skids and which can be towed short distances or transported 4 List of hazards specific to compressors 4 0 Introduction Hazards listed in clause 4 are hazards common to all compressors and which are listed under the heading Generally applicable
9. for handling oxygen compressors for handling acetylene Compressors for extreme temperatures and pressures high pressure compressors over 40 bar compressors for low inlet temperatures below 0 C Other types of compressors large compressors over 1000 kW input power portable and skid mounted air compressors compressors exposed for potentially explosive atmospheres Exceptions The following compressors are excluded from the scope of this standard compressors having a shaft input power of less than 0 5 kW compressors for gases other than acetylene having a maximum allowable working pressure of less than 0 5 bar refrigerant compressors used in refrigerating systems or heat pumps as defined in EN 378 2 Normative references This European standard incorporates by dated or undated reference provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references subsequent amendments to or revisions of any of the publications apply to this European standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies BSI 1997 Page 3 EN 1012 1 1996 EN 292 1 1991 Safety of machinery Basic concepts General principles for design Part 1 Basic terminology methodology EN 2
10. lubricated and BSI 1997 Page 19 EN 1012 1 1996 maintained are free from fire hazards However abnormally high temperatures in the oil system will accelerate oil oxidation with consequent risk High oil viscosity during cold start up clogged oil filters or valve malfunction can result in oil starvation B 2 2 Laboratory tests and experience from the field indicate that three factors are important to prevent the risk of such oil fires occurring These are the design the choice of oil the operation and maintenance of the compressor B 2 3 The following points are of particular importance a Regular and complete oil changes b Ensuring that the oil cooling arrangements are kept clean and protective devices maintained in working c Monitoring oil consumption Page 20 EN 1012 1 1996 Annex C informative Labels signs and tags Symbol Reference Colours Corresponding standard and registration number C 1 Mandatory Background blue ISO 7000 0419 Read the Instruction Symbol white Manual C 2 Mandatory action Background blue ISO 3864 Hearing protection Symbol white EN 61310 1 must be worn C 3 Prohibition Background Do not start white Circular band red Symbol black BSI 1997 Page 21 EN 1012 1 1996 Symbol Reference Colours Corresponding standard and registration number Prohibition Background Do not operate the white porta
11. pressure exceeding 10 bar safety pattern gauges according to EN 837 1 shall be used Page 14 EN 1012 1 1996 5 8 9 Emergency stops An emergency stop shall be provided when a hazardous situation can develop which needs to be averted by a manual action Emergency stop devices shall be in accordance with EN 418 and EN 50099 See annex C However if an analysis shows that the normal stop device complies functionally with emergency stop requirements this is acceptable and the stop device shall be marked accordingly 6 Markings signs written warnings 6 1 Generally applicable Markings signs and warnings shall be permanently attached and clearly visible 6 2 Data plate 6 2 1 Generally applicable Compressors shall be permanently marked on the data plate s with at least the following information name and address of the manufacturer year of manufacture designation type or series serial number or batch number and year maximum allowable working pressure bar at the outlet of the compressor nominal input shaft power kW rotational shaft speed mirr as rotational speed of prime mover interface or compressor 6 2 2 Portable and skid mounted air compressors Additional marking on the data plate to be applied the gross mass of the compressor kg the maximum vertical load on the coupling hook N 6 3 Signs and warnings 6 3 1 Generally applicable If relevant a sign to rec
12. shall be provided in the electrical installation to protect the wiring harness and the electric equipment This excludes the starter and charging circuit 5 2 2 Electrostatic phenomena The build up of electrostatic charges shall be avoided by earthing all conductive stationary components if there is a risk to persons or the possibility of an effective ignition source developing 5 2 3 External influences on electrical equipment The safety system and other electrical equipment shall be so designed and constructed that they cannot give rise to a hazardous situation in case of disturbances such as short circuiting external impacts variations in the supply voltage electromagnetic fields see EN 50081 2 and EN 50082 2 earthing faults 5 3 Thermal safety Where high or low temperature of the processed medium lubricant or cooling medium can cause a hazard to personnel the temperature shall be monitored and if the limits are exceeded the compressor shall be brought to a safe condition Pipework or other parts with an external surface temperature above 70 C or below 10 C and which may be accidentally touched by personnel during normal operation of the machine shall be guarded insulated or carry an adequate warning See EN 563 Other high temperature pipework shall be clearly marked in accordance with annex C Any piping shall be free to move with changing temperature and hot piping shall not
13. taken to protect the control system against being non operative the specification of lubricants for low temperatures or measures to be taken to keep the lubricating system warm BSI 1997 Page 15 EN 1012 1 1996 7 2 4 Information relating to operation a Starting and stopping b Emergency stop controls their location function and use c Guidelines for finding simple faults d Operation with lids and doors shut if the compressor is designed to be operated in this mode e The remote control of the compressor f Symbols used see annex C g Routine checks maintenance and cleaning procedures including the cleaning of coolers top up and replacement of simple parts e g air filters and oil filters h A recommendation for the use of hearing protectors if appropriate i The location of excessively hot or cold surfaces j The risk of inhalation of harmful gases mists and fumes k The risk of coke formation in the delivery piping 1 The means necessary to protect the operator from residual risks 7 2 5 Decommissioning Information on safe decommissioning is available in EN 626 7 2 6 Identification of the operator s position if appropriate 7 2 7 Noise Reference shall be made to the requirements in EN 292 2 1 7 4f of annex A 7 2 8 Training Requirements for the training of operators shall be stated 7 2 9 Instructions for specific types of compressors In addition the Instruction Manual shall contain the fo
14. 92 2 1991 Safety of machinery Basic concepts General principles for design Part 2 Technical principles and specifications EN 294 Safety of machinery Safety distances to prevent danger zones to be reached by the upper limbs EN 349 Minimum distances to avoid crushing of parts of the human body EN 378 Refrigerating systems and heat pumps Safety and environmental requirements EN 418 Safety of machinery Emergency stop equipment Functional aspects EN 563 Temperatures of touchable surfaces Ergonomic data to establish temperature limit values Jor hot surfaces Safety of machinery Principles for machinery manufacturers on the reduction of risk to health from hazardous substances emitted by machinery EN 626 EN 837 1 Pressure gauges Part 1 Bourdon tube pressure gauges Dimensions metrology requirements and testing EN 953 Safety of machinery Guarding of machinery Fixed and movable guards EN 1127 1 Safety of machinery Fires and explosions Part 1 Explosion prevention and protection ENV 1070 EN 12076 Safety of Machinery Terminology Acoustics Noise test code for compressors and vacuum pumps Grade 2 Electrical apparatus for potentially explosive atmospheres General requirements EN 50014 EN 50081 2 Electromagnetic compatibility Generic emission Part 2 Industrial environment EN 50082 2 Electroma
15. BRITISH STANDARD Compressors and vacuum pumps Safety requirements Part 1 Compressors The European Standard EN 1012 1 1996 has the status of a British Standard ICS 23 140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1012 1 1997 BS EN 1012 1 1997 This British Standard having been prepared under the direction of the Engineering Sector Board was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 1997 The following BSI references relate to the work on this standard Committee reference MCE 8 Draft for comment 93 703167 DC ISBN 0 580 26279 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MCE 8 Compressors pneumatic tools and pneumatic machines upon which the following bodies were represented British Compressed Air Society Engineering Equipment and Materials Users Association Institute of Marine Engineers Institution of Gas Engineers Institution of Mechanical Engineers Institution of Plant Engineers South Wales Institute of Engineers Amendments issued since publication Amd No Date Text affected BS EN 1012 1 1997 Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 1012 1 3 BSI 1997 BS EN 1012 1 1997
16. I 1997 26 blank BS EN 1012 1 1997 List of references See national foreword BSI 1997 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible the identity of which can be found on the inside front cover Tel 020 8996 9000 Fax 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI international and foreign standards publications should be addressed to Customer Services Tel 020 8996 9001 Fax 020 8996 7001 In response to orders for international standards it is BSI policy to supply the BSI implementation of those that have been published as British Standards unless otherwise requested Information on standards BS
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18. N 953 Guards 5 8 3 4 5 6 x x x ISO 4196 1 Pressure relief devices 5 8 8 x x EN 837 1 Warning device 5 8 9 x x EN 418 Emergency stop EN 61310 1 BSI 1997 Page 18 EN 1012 1 1996 Annex A informative Bibliography In this annex are listed various reference documents for information and which have a bearing on the content of this standard EN 286 1 Simple unfired pressure vessels designed to contain air or nitrogen Part 1 Design manufacture and testing IGC 9 78 Code of practice for acetylene pipelines based upon working ranges IGC 10 81 Reciprocating compressors for oxygen services Code of practice IGC 27 93 Turbo compressors for oxygen services Code of practice The documents IGC 9 78 10 81 and 27 93 can be obtained from European Industrial Gases Association Avenue des Art Bte 16 1040 BRUSSELS Directive 79 113 EEC Council directive on the approximation of the laws of the member states relating to the determination of noise emission of construction plant and equipment Directive 84 533 EEC Council directive on the approximation of the laws of the member states relating to the permissible sound power level of compressors Directive 85 406 EEC Commission directive of 11 July 1985 adapting to technical progress Council directive 84 5383 EEC on the approximation of the laws of the member states relating to the permissible sound power levels of COMPYESSOTS Direc
19. National foreword This British Standard has been prepared by Technical Committee MCE 8 and is the English language version of EN 1012 Compressors and vacuum pumps Part 1 1996 Compressors published by the European Committee for Standardization CEN EN 1012 1 was produced as a result of international discussions in which the United Kingdom took an active part Cross references Publication referred to EN 292 1 1991 EN 292 2 1991 EN 294 EN 349 EN 418 EN 563 EN 626 ENV 1070 EN 50014 EN 50081 2 EN 50082 2 EN 61310 1 Corresponding British Standard BS EN 292 Safety of machinery Basic concepts General principles for design Part 1 1991 Basic terminology methodology Part 2 1991 Technical principles and specifications BS EN 294 1992 Safety of machinery Safety distances to prevent danger zones to be reached by the upper limbs BS EN 349 1993 Safety of machinery Minimum gaps to avoid crushing of parts of the human body BS EN 418 1992 Safety of machinery Emergency stop equipment Functional aspects Principles for design BS EN 563 1994 Safety of machinery Temperatures of touchable surfaces Ergonomic data to establish temperature limit values for hot surfaces BS EN 626 Safety of machinery Reduction of risks to health from hazardous substances emitted by machinery Part 1 1995 Principles and specifications for machinery manufacturers Part 2
20. Warning signs according to annex C that automatic or remote start may take place shall be provided For signals in the monitoring and control system which have a low energy level and which may influence each other special care shall be taken to ensure that they are securely transmitted 5 8 1 2 Gas compressors Safety devices shall be installed which provide an alarm and if appropriate trip the compressor or shut off the supply of gas and prevent air entering the compressor if any one of the following conditions arise the temperature of the main gas stream at any casing or cylinder exceeds the maximum allowed value there is a lubricant shortage which may lead to a lack of cylinder lubrication for compressors with rated power exceeding 20 kW the force feed lubrication pressure is below the minimum allowed value If the inlet pressure of a flammable gas after the filter can drop below the atmospheric pressure then the admission of air shall be prevented by suitable means 5 8 1 3 Oxygen compressors Safety devices shall be installed and shall shut down or bring the compressor to a safe condition if any one of the following conditions arise there is a shortage of injected liquid for lubrication of the compressor the temperature of the main gas stream at any casing or cylinder exceeds a maximum allowed value the pressure or flow of cooling water falls below the minimum allowed value the lubricatio
21. all be easily drained off without hazard The refuelling point shall be so located that any spillage is clear of hot surfaces 5 5 4 Micro organisms biological and microbiological substances Drainage facilities shall be provided to avoid the accumulation of stagnant liquid which may promote the growth of micro organisms The compressor shall be equipped to allow containment of condensate fluids and subsequent safe disposal 5 6 Ergonomic principles 5 6 1 Generally applicable Start and stop devices shall be easy to operate and shall be clearly marked in accordance with EN 418 or IEC 417 See annex C Manual controls and other frequently used devices shall be arranged to be easily reached and operated without excessive effort Instruments shall be located so as to be easily visible from the operator s position from which the controls related to those instruments are operated Controls and instruments shall be designed and arranged to assist the operator to understand their function and hence avoid operator s error The compressor shall be designed and constructed to permit safe handling of fluids during filling purging venting recovery and draining 5 6 2 Portable and skid mounted compressors If the load on the tow bar at the point where it is lifted is more than 500 N a mechanism shall be provided for lifting the tow bar Refuelling points shall be easily accessible 5 7 Failure of energy supply breaking d
22. and skid mounted air compressors The exhaust system from the internal combustion engine shall be so directed that in normal operation the exposure of personnel to exhaust fumes is minimized 5 5 3 Fire and explosion 5 5 3 1 Generally applicable Immersion heaters used for heating the lubricant shall have a power dissipation not greater than 25 kW m2 For general information on fire and explosion see ISO 5388 5 5 3 2 Oil flooded rotary air compressors a The design of oil flooded rotary air compressors shall be such that the maximum temperature at the delivery flange of the compressor before the oil separator does not exceed 110 C under normal conditions Oil flooded rotary air compressors shall have an automatic shutdown device to trip the compressor in the event that the temperature of the compressor oil exceeds the safe limit The tripping device shall be actuated at a temperature not exceeding 120 C Temperatures higher than 120 C may be permissible when special lubricants are used b The temperature measurement probe or sensor shall be located as close as possible to the outlet port of the compressor element c The compressor shall be so designed that a sufficient quantity of lubricant is injected under all operating conditions i e under normal use as well as under abnormal conditions and use not covered by safety devices e g faulty starting emergency stop d Oil filters in the main circuit shall have a b
23. ard about 100 mm high Stairs or ladders of more than four steps shall have a safety rail on both sides 5 2 Electrical safety 5 2 1 Electrical installation 5 2 1 1 Generally applicable The electrical installation of a compressor shall fulfil the requirements of EN 60204 1 Protection devices and switches shall be so designed and connected as to fulfil the requirements of fail safe The overcurrent protection of the power circuit may be installed outside the compressor enclosure on site In such a case the Instruction Manual shall state that the user has to make provision for the installation of the overcurrent protection of the power circuit Where the compressor is not fitted with an electrical disconnecting device the Instruction Manual shall specify that this device is to be provided by the user Wiring harnesses shall be adequately secured and protected not be in contact with hot surfaces have adequate electrical insulation Page 8 EN 1012 1 1996 For compressors to be installed in potentially explosive atmospheres the electrical equipment shall comply with EN 50014 5 2 1 2 Portable and skid mounted air compressors Batteries shall be firmly secured and provided with lifting points They shall be mounted so there is no risk of electrolyte splashing on personnel and surrounding equipment The terminals shall be insulated according to 4 10 and 4 11 of ISO 3457 A suitable overcurrent protection device
24. azards shall be sought from competent bodies and precautions taken a Hazards caused by reactions of the gas inside the compressor shall be avoided as applicable by limiting the compression temperature by design and by installing tripping devices on the discharge of each casing or cylinder preventing ignition hazard e g hot surfaces or friction choice of suitable lubricant and or use of sparkless material pairing where friction is possible using materials resistant to corrosion caused by the processed gas arranging connections so that adequate purging of the compressor system with inert gas can be achieved using filters or other appropriate measures to avoid solid impurities in the processed gas ensuring that the compressor installation undergoes a leak tightness test at commissioning b If the requirements of clause a cannot be fulfilled or are insufficient and there is a risk from decomposition of the gas or of an explosion in the gas the system shall be built to resist the resulting pressure If this is not possible the Instruction Manual shall state that personnel shall not have access to the danger zone BSI 1997 c The gas dispersal into the environment shall be minimized by the following measures preventing leakage of harmful or flammable gases providing double sealing with intermediate venting or with a sealing medium using gaskets suitable for the gases processed at pr
25. be in contact with wood or flammable material Compressors installed in an area with potentially explosive atmosphere must have limited surface temperatures and any other ignition sources shall be avoided see EN 50014 and EN 1127 1 5 4 Noise 5 4 1 Generally applicable Design considerations shall be given to noise reduction taking into account ISO TR 11688 1 Design shall be such that continuous full load operation is possible at the maximum specified ambient temperature with all the doors and access covers closed 5 4 2 Construction site compressors The noise emission level shall comply with the requirements for construction site equipment 5 5 Materials and substances processed used or exhausted 5 5 1 Liquid shock If liquid resulting from injection priming or condensation can be present or be formed adequate separators traps and draining facilities shall be installed If this equipment is not part of the compressor the Instruction Manual shall state that this equipment shall be installed outside the compressor 5 5 2 Gases and substances processed 5 5 2 1 Generally applicable Freezing of coolant effects on the lubrication or ingested liquid due to low temperature of the media being compressed or of the environment at starting stopping or unloading conditions shall be prevented by suitable means 5 5 2 2 Gas compressors For gases or vapours other than those specifically treated in this standard advice on h
26. ble compressor Circular band with the doors or red enclosures open Symbol black Prohibition Background Do not open the cock white before the air hose is Circular band attached red Symbol black C 6 Warning Background ISO 7000 0017 Unit is remotely yellow controlled and may Triangular band start without warning black Symbol black BSI 1997 Page 22 EN 1012 1 1996 Symbol Reference Colours Corresponding standard and registration number C 7 Warning Background TEC 417 5041 Risk of high yellow temperature Triangular band black Symbol black C 8 Warning Background Maintenance work in yellow progress Triangular band black Symbol black C 9 Warning Exhaust of hot or harmful gases in normal working area Background yellow Triangular band black Symbol black BSI 1997 Page 23 EN 1012 1 1996 Symbol Reference Colours Corresponding standard and registration number C 10 Warning Background EN 61310 1 Risk of low yellow temperature Triangular band black Symbol black C 11 Warning Background EN 61310 1 Risk of electric shock yellow ISO 3864 Triangular band black Symbol black C 12 Start device TEC 417 5007 C 13 Stop device IEC 417 5008 C 14 Start and stop device IEC 417 5010 BSI 1997 Page 24 EN 1012 1 1996 Symbol Refer
27. c principles in machine design 4 6 1 Generally applicable neglecting to use personal protection 7 2 4 equipment human errors resulting from unsuitable 5 6 1 7 2 3 positioning of control devices and instruments 4 6 2 Portable and skid mounted air compressors tow bars with excessive down load 5 6 2 4 7 Hazards caused by failure of energy supply breaking down of machinery parts and other functional disorders 4 7 1 Generally applicable 5 7 1 1 5 7 1 1 failure of energy supply failure of control system e g unexpected start up errors of fitting 5 7 3 break down of machinery parts due to 5 7 2 1 dynamic stresses fatigue and cyclic pressure variation hazards resulting from leakages and 5 7 2 1 gas discharges 4 7 2 Gas compressors break down of machinery parts 4 7 3 Acetylene compressors break down of machinery parts 4 7 4 High pressure compressors leakage 4 7 5 Portable and skid mounted air compressors loss of braking capacity falling when lifted breaking down deterioration or bursting of delivery hose 4 8 Hazards caused by missing or incorrectly positioned safety related measures and means 4 8 1 Generally applicable all kinds of guards all kinds of safety related devices starting and stopping devices safety signs and tags all kinds of information or warning devices energy supply disconnect devices emergenc
28. cation of pressure safety and relief devices to the gas and air side Only the final stage of multi stage positive displacement compressors requires a pressure relief device if the other stages cannot be shut off individually and provided each stage and intermediate section is designed for the maximum allowable working pressure of the final stage Pressure safety devices are not required for rotary compressors with an inlet volume flow of up to 300 m h 83 l s and which by design cannot exceed a maximum allowable working pressure of 1 bar Pressure safety devices are not required for small single stage reciprocating compressors with an input power of less than or equal to 1 kW and which by design are not capable of exceeding their maximum allowable working pressure BSI 1997 Page 13 EN 1012 1 1996 5 8 5 Application of pressure relief devices at the cooling medium side In the case of components containing liquid whose volume can be isolated and potentially subject to temperature rise or in some cases temperature fall measures shall be taken to avoid the build up of unallowable pressure 5 8 6 Installation of pressure relief devices Pressure relief devices shall be installed as close as practical to the system to be protected Under no circumstances shall it be possible to isolate a relief device from the system it is protecting Direct relief to the atmosphere is recommended but if not acceptable due to the
29. cooling due to a build up of deposits A failure of cooling water can result in a sharp rise in temperature above the level appropriate to the particular machine and is a well recognized cause of fire initiation when the coke layer in the hot zone is thick enough Failure of valves can similarly raise the temperature and cause dangerous conditions BSI 1997 B 1 3 The presence of certain substances can have a catalytic effect e g iron oxide rust B 1 4 To prevent excess temperature build up and the likelihood of a cylinder fire multistage lubricated compressors should be unloaded in the correct sequence i e from the high pressure stage downward This is of particular relevance where manual drainage is left to the discretion of the operator Loading should be carried out in the opposite sequence i e from the low pressure to the high B 1 5 Oil choking sometimes occurs in gear transmissions with high pitchline velocities This has in some instances resulted in overheating of the oil and subsequent fires Sufficient free oil volume inside the gear casing and adequate drainage facilities shall be provided to avoid this Any space such as a crank case or gear box where risk of oil mist or vapour could lead to an explosion should be provided with a relief device to retrieve the increase caused by an explosion B 2 Oil flooded compressors B 2 1 Experience shows that oil flooded rotary air compressors of good design correctly
30. dination of safety standards with CEN TC 182 Refrigerating systems safety and environmental requirements and CEN TC 234 Gas supply Annexes A C and ZA to this European Standard are informative and annex B is normative The standard is divided in two parts EN 1012 1 Compressors EN 1012 2 Vacuum Pumps Contents Foreword 1 Scope 3 2 Normative references 3 3 Definitions 4 3 1 General definitions 4 3 2 Definitions of specific compressors 4 4 List of hazards specific to compressors 5 4 0 Introduction 5 4 1 Mechanical hazards 5 4 2 Electrical hazards 5 4 3 Thermal hazards 5 4 4 Noise 5 4 5 Hazards generated by used or exhausted materials and substances processed 5 4 6 4 7 4 8 Hazards generated by neglecting ergonomic principles in machine design Hazards caused by failure of energy supply breaking down of machinery parts and other functional disorders Hazards caused by missing or incorrectly positioned safety related measures and means 5 Safety requirements and measures for all types of compressors 5 1 Mechanical safety 5 2 Electrical safety 5 3 Thermal safety 5 4 Noise 5 5 Materials and substances processed used or exhausted 5 6 Ergonomic principles 5 7 Failure of energy supply breaking down of machinery parts and other functional disorders 5 8 Safety related measures and means 6 Markings signs written warnings 6 1 Generally applicable 6 2 Data plate 6 3 Signs and warnings 7 In
31. ence Colours Corresponding standard and registration number C 15 Emergency stop device Red coloured EN 418 mushroom type push button mounted on a yellow background C 16 Combined stop and Red coloured EN 418 emergency stop device Symbol white TEC 417 5008 mushroom type push button mounted on a yellow background C 17 Direction of rotation Symbol black ISO 7000 004 C 18 Fuel fill Symbol black ISO 7000 0245 C 19 Oil fill Symbol black ISO 7000 0248 7 C 20 O Coolant fill Symbol black TSO 7000 0524 C 21 Lifting point Symbol black ISO 7000 1368 BSI 1997 Page 25 EN 1012 1 1996 Annex ZA informative Clauses of this European Standard addressing essential requirements or other provisions of EU Directives This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EU Directive 89 392 EEC Safety of machinery WARNING Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard The following clause of this standard is likely to support the requirements of the above Directive Clause 5 Safety requirements and measures for all types of compressors Compliance with clause 5 of this standard provides one means of conforming with the specific essential requirements of the Directive concerned and associated EFTA regulations BS
32. enerated by used or exhausted materials and substances processed 4 5 1 Generally applicable contact with or inhalation of harmful 5 5 1 7 2 4 fluids gases mists fumes and dust fire or explosion 5 5 3 1 7 2 3 biological and micro biological 5 5 4 substances 4 5 2 Air compressors fire and explosion 5 5 3 2 5 5 3 3 7 3 4 5 3 Gas compressors reaction explosion or decomposition 5 5 2 2a b of the gas inside the compressor reactions of the processed gas with 5 5 2 2b the environment due to leakage dispersal of the processed gas into the 5 5 2 2c environment Page 6 EN 1012 1 1996 4 5 4 Oxygen compressors reaction of the oxygen inside the 5 5 2 3a compressor inadequate choice of materials for 5 5 2 3b oxygen service inadequate choice of materials and 5 5 2 3 design of valves for oxyen service lack of maintenance and cleaning 5 5 2 3d emission of oxygen or oxygen 5 5 2 3e enriched atmosphere 4 5 5 Acetylene compressors decomposition of acetylene 5 5 2 4a b flammability of acetylene in gas 5 5 2 4 mixture 4 5 6 High pressure compressors increased reactivity of gases lubricants 5 5 2 5 and impurities at high pressure 4 5 7 Portable and skid mounted air compressors contact with or inhalation of harmful 5 5 2 6 gases 5 5 3 4 5 5 3 4 fire or explosion refuelling 4 6 Hazards generated by neglecting ergonomi
33. evailing pressures and temperatures neutralizing diluting to a safe level or venting into a safe area taking precautions for handling polluted lubricants drainages and deposits 5 5 2 3 Oxygen compressors An oxygen enriched atmosphere creates conditions for health and fire hazards in the installation area and the following safety measures for the compressors shall be taken as a minimum Page 9 EN 1012 1 1996 isolating and unloading valves inside the danger zone shall be remotely operated valves shall be designed so that spindles are secure against withdrawal d Maintenance and cleaning provisions shall be made to allow thorough inspection and cleaning of the compressor including the cooling jackets connections when integral with the compressor shall be arranged so that purging of the compressor system with dry oil free air or inert gas can be carried out Where such connections are not provided by the supplier the Instruction Manual shall instruct the user that such purging is necessary components for oxygen service shall be free of particles and rust and free from oil and grease other than lubricants recognized for oxygen service a Ignition points shall be avoided by ensuring adequate clearance between moving parts selecting suitable materials limiting the quantity and size of particles and impurities in the oxygen stream not allowing oil and grease i
34. event starting whilst openings are not fully and properly closed The doors shall be lockable in the open position 5 1 2 Fluid injection 5 1 2 1 Generally applicable The hazard of fluid injection into the human body shall be minimized by designing all auxiliaries which come within the scope of pressure equipment codes e g coolers hoses pipes separators silencers and traps in accordance with the applicable codes testing pressure containing parts on the gas side of the compressor according to subclause 8 1 designing and supporting integral pipework hoses and auxiliaries to withstand vibration thermal expansion and their own mass foreseeable external forces influence of contaminants and external chemical substances ensuring that all piping which is in a position likely to be damaged is protected robust and sufficiently supported taking measures to prevent damage from freezing during off load or non operational periods Providing drainage facilities to ensure that liquid can be removed from piping and accessories such as water jackets coolers pulsation dampers and air receivers See also subclause 7 2 5 1 2 2 High pressure compressors The design of pressure relief devices and the location of vents shall take account of the characteristics and velocity of gas likely to be discharged BSI 1997 Page 7 EN 1012 1 1996 5 1 3 Ejection of parts Moving parts shall be designed and mou
35. gnetic compatibility Generic immunity Part 2 Industrial environment Page 4 EN 1012 1 1996 EN 61310 1 Safety of machinery Indication marking and actuation Part 1 Requirements for visual auditory and tactile signals IEC 1310 1 1995 Electrical equipment of industrial machines Part 1 General requirements EN 60204 1 ISO 3457 Earth moving machinery Guards and shields Definitions and specifications ISO 3864 ISO 3857 1 Safety colours and safety signs Compressors pneumatic tools and machines Vocabulary Part 1 General Compressors pneumatic tools and machines Vocabulary Part 2 Compressors ISO 3857 2 ISO 4126 1 Safety valves Part 1 General requirements ISO 4871 Acoustics Declaration and verification of noise emission values of machinery and equipment ISO 6743 38A Lubricants industrial oils and related products Class L Classification Part 3A Family D Compressors ISO 6743 3B Lubricants industrial oils and related products Class L Classification Part 3B Family D Gas and refrigeration compressors ISO 7000 Graphical symbols for use on equipment Index and synopsis ISO TR 11688 1 Acoustics Recommended practice Jor the design of low noise machinery and equipment Part 1 Planning IEC 417 Graphical symbols for use on equipment 3 Definitions For the purposes of this standard the definitions gi
36. il system shall be separated from any discharge with a high oxygen content 5 5 2 4 Acetylene compressors Acetylene is a highly flammable and chemically unstable gas It may spontaneously decompose resulting in deflagration with a pressure increase about 11 times the initial pressure or can detonate with a pressure increase up to 350 times the initial pressure a To limit the hazards and the consequences of decomposition the following precautions shall be taken limit the capacity or the power of each compression unit the diameter and length of the gas piping shall be as small as practicable consideration of installation of flash arrestors at the inlet and outlet of the compressor system b The risk of decomposition shall be minimized by considering the pressure and temperature of the acetylene to avoid liquefaction limiting the compression temperature by design to a maximum of 140 C under any foreseeable circumstances avoiding hot spots by applying suitable lubrication low piston speed cooling and precautions to preclude impurities or debris of hard material avoiding the presence of catalytic agents which promote decomposition e g iron rust pipe scale using materials which do not react with acetylene or other components in the processed gas Page 10 EN 1012 1 1996 1 prohibited materials copper and copper alloys with more than 70 copper for filter meshes
37. l obligations BSI 1997 iti blank EUROPEAN STANDARD EN 1012 1 NORME EUROP ENNE EUROP ISCHE NORM April 1996 ICS 23 140 Descriptors Air compressors safety requirements safety of machines accident prevention definitions failure safety measures design construction installation utilization maintenance verification name plates English version Compressors and vacuum pumps Safety requirements Part 1 Compressors Compresseurs et pompes vide Kompressoren und Vakuumpumpen Prescriptions de s curit Sicherheitsanforderungen Partie 1 Compresseurs Teil 1 Kompressoren This European Standard was approved by CEN on 1996 03 13 CEN members are bound to comply with the CEN CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up to date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member The European Standards exist in three official versions English French German A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Ita
38. llowing information for specific types of compressors 7 2 9 1 Portable and skid mounted air compressors a All necessary instructions for correct operation inspection lifting and transportation b A warning that all hoses and fittings shall be suitable for site use at the maximum allowable working pressure of the portable compressors c A recommendation that for pressures above 7 bar delivery hoses should be fitted with a safety cable d Information on the greatest permissible inclination from the horizontal e Warning against the use of an internal combustion engine driven compressor in a confined space f That before towing the jockey wheel or support stand is raised the coupling is securely fastened to the towing vehicle a safety device is installed to stop the compressor if the towing connection fails while towing lighting leads are correctly connected Page 16 EN 1012 1 1996 7 2 9 2 Gas compressors If there is a risk from decomposition of the gas or of internal explosion and the compressor is not built to resist the resulting pressure a warning shall be given and the compressor area shall be designated as a danger zone Information shall be given on the appropriate purging of associated piping and equipment 7 2 9 3 Acetylene compressors The user shall be instructed to install flash arrestors in the system to prevent propagation of flash backs in the installation 7 2 9 4 Large compressors
39. ly Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland and United Kingdom CEN European Committee for Standardization Comit Europ en de Normalisation Europ isches Komitee f r Normung Central Secretariat rue de Stassart 36 B 1050 Brussels 1996 Copyright reserved to CEN members Ref No EN 1012 1 1996 E Page 2 EN 1012 1 1996 Foreword This European Standard has been prepared by Technical Committee CEN TC 232 Compressors Safety the secretariat of which is held by SIS This European Standard shall be given the status of a national standard either by publication of an identical text or by endorsement at the latest by October 1996 and conflicting standards shall be withdrawn at the latest by October 1996 This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EU Directive s For the relationship with EU Directive s see informative annex ZA which is an integral part of this standard According to the CEN CENELEC Internal Regulations the national standards organizations of the following countries are bound to implement this European Standard Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland and the United Kingdom The responsibility of CEN TC 232 includes coor
40. n pressure falls below the minimum allowed value for the compressor the vibration exceeds a preset value for compressors with a shaft input power exceeding 100 kW 5 8 1 4 Large compressors If it is necessary for periodical inspections and repairs to override the monitoring and control system during operation this is allowed provided that the alarm system remains in operation during the override and an alarm signal is given when the safety limits are reached override is indicated by a clearly observable signal override is effected by auxiliaries specially installed for that purpose e g key operated switches 5 8 2 Guards All moving parts shall be enclosed within the permanent casing or cover of the compressor When this is not possible guards shall be provided to prevent contact with all rotating and reciprocating parts which may be hazardous to personnel An opening shall be provided in flywheel guards when required for barring over the compressor and to provide access to timing marks wheel hub and any other part which may require attention This opening shall be closed when the compressor is in operation Guards shall be sufficiently rigid so as not to deflect as a result of bodily contact see EN 953 BSI 1997 5 8 3 Pressure relief devices 5 8 3 1 Generally applicable Each separate pressure containing compartment of a compressor and auxiliary used to contain gas above atmospheric pressure
41. n the oxygen stream avoiding corrosion particularly by minimizing moisture preventing any contact between oxygen and substances having combustible properties mainly oil and greases limiting the oxygen discharge temperature by design and by installation of a shutdown device limiting the oxygen velocity in pipes ensuring no severe bends or sharp interior edges providing adequate cooling b The choice of materials in oxygen compressors shall be optimized under consideration of the following characteristics high ignition temperature high thermal conductivity high specific heat capacity low specific heat of combustion adequate corrosion resistance recognized quality for oxygen service of non metallic materials e g gaskets or seals coolants and lubricants that can come into contact with oxygen shall be of a quality recognized as not being flammable in oxygen service c The following are specified for piping and valves carbon steel pipes can be used depending on oxygen pressure and velocity based on documented values accepted in the oxygen industry valves shall be designed for low friction flow and operation BSI 1997 e Hazard due to emission of oxygen all released gases purges drainage and leakages containing oxygen shall be discharged without hazard to personnel and provisions made for adequate dilution the venting of any o
42. nager Tel 020 8996 7070
43. nature or pressure of the gas being released the discharge shall be arranged so as not to create a hazard to personnel and environment Pressure relief discharge lines shall be affixed so that no excessive forces can be transmitted to the pressure relief devices Pressure relief discharge lines shall be so designed and constructed that collection of liquid at any point in the system is avoided Pressure relief devices shall be accessible for maintenance The pressure drop in the piping between the compressor and the pressure relief device shall not exceed 3 of the set pressure of the pressure relief device when discharging at full flow 5 8 7 Design specifications of pressure relief devices The design and functional requirements of pressure relief valves shall conform to ISO 4126 1 5 8 8 Information and warning devices A suitable pressure indicator shall be provided to display the pressure in the final outlet of a compressor each separate stage of diaphragm compressors with a maximum allowable working pressure exceeding 3 bar each separate stage of positive displacement compressors having a shaft input power of more than 20 kW the pump feed lubricant system on a compressor having an input power of more than 75 kW the inlet of a compressor having inlet conditions other than atmospheric For mechanical pressure gauges with a casing diameter exceeding 63 mm and a maximum allowable working
44. nted in such a way that in all foreseeable modes of operation the ejection of parts is avoided 5 1 4 Loss of stability 5 1 4 1 Generally applicable Compressors shall be provided with means to allow them to be adequately mounted and secured 5 1 4 2 Portable and skid mounted air compressors The centre of gravity shall be low enough to ensure that the compressor remains stable without tipping or slipping when used within the manufacturer s limits which shall be stated in the instructions Tyres of a compressor shall be rated to carry the maximum gross mass of the compressor at the highest towing speed specified by the manufacturer All tyres shall be of the same construction NOTE Gross mass is defined as the maximum specified mass of the compressor including tools equipment and fuel The support leg or jockey wheel shall be of adequate strength It shall be possible to securely lock it in both the support and towing positions 5 1 5 Slip trip and fall Platforms stairs and railings that are an integral part of the compressor shall be positioned so that access is available to all areas where routine maintenance or operator s inspections are necessary Their positioning shall not interfere with maintenance of any parts with respect to accessibility or lifting Open sides of platforms elevated by more than 1 m shall be guarded with safety rails set at about 1050 mm and 600 mm above the platform and provided with a toe bo
45. ntrations and stress levels Seals or gaskets shall be made from materials which are capable of withstanding the extremes of pressure and temperature to be encountered 5 7 2 2 Gas compressors If there is a risk of explosion or decomposition of the gas the compressor shall be built to resist the resulting pressure or the risk shall be warned against For flammable toxic and corrosive gases precautions shall be taken to prevent leakage into the coolant circuit This does not apply to separate oil circuits of compressors with direct oil injection 5 7 2 3 Acetylene compressors The compressor system shall be built to resist increases of pressure due to deflagration resulting from accidental gas decomposition Precautions shall be taken to prevent leakage into the coolant circuit 5 7 2 4 High pressure compressors For gases under high pressure precautions shall be taken to prevent detectable pressure rise in the coolant system caused by gas leakage Page 12 EN 1012 1 1996 5 7 2 5 Portable and skid mounted air compressors a Off road portable compressors shall meet the following requirements for machines with a gross mass over 750 kg a parking brake system shall be fitted to provide efficient braking for compressors equipped with brakes an effective mechanism shall be provided to apply the brakes automatically if the compressor becomes decoupled from the towing vehicle for compressors without brakes
46. nufacturer or his authorized representative or by the person introducing the machinery into the language area in question The text shall be simple adequate complete and be suitable for the personnel responsible for the compressor For additional requirements for Instruction Manuals see 5 5 of EN 292 2 The sales brochures describing the machinery shall not contradict the instructions for use with regard to safety The documentation supplied shall be appropriate to the complexity of the compressor and shall consist of a Instruction Manual to be supplied with all machines including instructions for both the owner and operator The Instruction Manual shall be kept permanently with the compressor and be available for the operator b Service Instruction comprising the instructions for the tasks to be carried out by specialised personnel c List of parts used for service The information in this documentation may appear in more than one document BSI 1997 7 2 Instruction Manual This document shall contain 7 2 1 The same information as on the data plate 7 2 2 Drawings diagrams instructions and information on a The installation and assembly b The disconnecting device to isolate the compressor from the electrical supply c The putting into operation d The shutting down e The taking out of operation f The handling and lifting e g mass of compressor or major assemblies g The adjustments and settings
47. ommend the use of hearing protectors shall be displayed For symbol see annex C The direction of rotation shall be marked on the compressor by means of an arrow see annex C 6 3 2 Large compressors For compressor enclosures within which there are excessively hot or cold surfaces a clear warning shall be marked at the entrance 6 3 3 Portable and skid mounted air compressors Suitable warning symbols shall be attached to the compressor that the outlet cocks of the compressor must not be opened unless a hose is attached for hot surfaces to operate only with doors and lids closed stating the correct fuel at the point of refuelling marking of input points for fuel oil coolant marking of the specified tyre pressure marking of lashing and lifting points For symbols see annex C 7 Instructions for use 7 1 Generally applicable Documentation shall be supplied with each compressor to cover its intended use It shall lay down procedures for safe operation and maintenance and shall warn against known dangerous practices misuses and residual risks The documentation shall be drawn up by the manufacturer On being put into service all compressors must be accompanied by the Instruction Manual in the original language of the manufacturer and a translation of this in one of the official languages of the country in which the compressor is to be used The translation may be done either by the ma
48. own of machinery parts and other functional disorders 5 7 1 Failure of energy supply 5 7 1 1 Generally applicable In case of loss of the main or auxiliary energy supply the compressor shall be brought to a safe condition by the safety system The system design shall be such that failure of the energy supply or the control system shall not result in a hazardous situation at the time of the failure or when the energy supply is reinstated or the control system is operable again BSI 1997 Page 11 EN 1012 1 1996 5 7 1 2 Large compressors Compressed air for measuring control and safety systems shall be suitably conditioned for the purpose Hydraulic systems for measuring control and safety shall be provided with a double filter system A shut down device shall be fitted to stop the compressor in case of the hydraulic fluid level or pressure falling below the specified values if no fail safe device exists 5 7 2 Breaking down of machinery parts 5 7 2 1 Generally applicable Materials used in compressors shall not endanger the health and safety of personnel Materials used shall be compatible with the lubricants or other fluids specified by the manufacturer and with the substances being processed Materials chosen shall have sufficient ductility and fatigue resistance for the specified and foreseeable stress level that occurs The shape of parts under cyclic pressure variation shall be chosen to reduce stress conce
49. rrying out major servicing and repairs of the compressor installation 7 4 List of parts used for service The manufacturer shall provide a list giving information on all relevant parts used for service with an unambiguous identification and indicating the location of the part on the compressor 8 Verification 8 1 Pressure tests 8 1 1 Generally applicable The parts or assemblies forming the pressurized gas side and coolant side of the compression space shall be tested at a test pressure of not less than 1 5 times the maximum allowable working pressure for cast parts 1 3 times the maximum allowable working pressure for forged and welded parts with stress calculation and for parts pressurized above 2000 bar For compressors produced in batches and designed to operate at maximum allowable working pressure not greater than 16 bar sample testing is allowed However individual testing is required for compressor casings with integral pressure vessels reclaimer systems heat exchanger housings oil separator systems oil reservoirs if the energy content of the component exceeds 250 bar litres 8 1 2 Acetylene compressors The ability of acetylene compressors to withstand elevated pressure in case of deflagration shall be tested see table 1 Table 1 Test pressures Max allowable working Test pressure pressure p bar bar p lt 0 2 3 75 02 lt p lt 04 12 04 lt p lt 15 25 15 p 11 X p 10
50. shall be protected by a pressure relief device or devices if its maximum allowable working pressure can be exceeded Maximum allowable working pressure must not be exceeded by more than 10 A risk assessment shall be made to ensure that under all foreseeable conditions the design will not result in maximum allowable working pressure of any compressor compartment being exceeded The flow at this pressure for the most severe conditions shall determine the size of the pressure relief device Devices to prevent the maximum allowable working pressure from being exceeded shall be pressure relief valves or bursting discs or pressure sensing devices whose effectiveness can be proven and which cause any one of the following actions a stopping of the prime mover b isolating the pressure system by shut off devices cC opening of pressure relief valves such as overflow or blow off valves The pressure sensing devices shall have a fail safe action and there shall be at least two of them which shall be protected against unauthorized adjustment 5 8 3 2 Turbo compressors For turbo compressors with atmospheric suction which by design cannot attain a pressure of more than 110 of the maximum allowable working pressure it is not mandatory to apply safety relief devices for safeguarding the outlet pressure The control of pressure may be maintained by an appropriate means or an alarm shall be given 5 8 4 Appli
51. structions for use 7 1 Generally applicable 7 2 Instruction Manual 7 3 Service Manual 7 4 List of parts used for service 8 Verification 8 1 Pressure tests 8 2 Leak tightness test for hazardous gases 8 3 Noise measurements 8 4 Structure of verification Annexes A informative Bibliography B normative Fires and explosions in the pressure system C informative Labels signs and tags ZA informative Clauses of this European Standard addressing essential requirements or other provisions of EU Directives ceo NNN 11 11 12 14 14 14 14 14 14 15 16 16 16 16 16 17 17 18 18 20 25 BSI 1997 1 Scope This standard is applicable to all types of compressors The standard lists the significant hazards associated with compressors and specifies safety requirements applicable to the design installation operation maintenance and dismantling of compressors during their foreseeable lifetime and subsequent disposal Compressors intended for use in special applications shall also comply with any specific standards relating to those applications This standard specifies safety requirements for all compressors and additional requirements for the following specific types Compressors for various types of gases oil lubricated air compressors oil flooded air compressors oil free air compressors compressors for handling hazardous gases gas compressors compressors
52. the installation of lighting and light signalling devices on motor vehicles and their trailers Annex B normative Fires and explosions in the pressure system B 1 Oil lubricated compressors B 1 1 It is generally accepted that the occurrence of fires in oil lubricated air compressor systems dependent on the build up of oil degradation deposits oil coke Instructions shall be provided to ensure that oil quality and system cleanliness are maintained B 1 2 Delivery temperatures rise and hence coke forms at a higher rate if an air cooled compressor is badly sited or there is a restriction to the cooling fluid flow Factors that affect coke formation are listed below a Type and quality of oil used The temperature at which significant oxidation starts is related to the grade and type of oil used b Rate of oil feed Excessive oil feed promotes deposit formation c Oil exposure time Solids ingested with the suction air thicken the oil and delay its passage through the hot part of the delivery system increase the time it is subject to oxidation and hence increase the rate of deposit formation d Temperature It is good practice to reduce the air temperature by a special air cooler to not more than 80 C if any pressure vessel or piping system is arranged downstream of the compressor In the case of compressors with water cooled cylinders it is recommended that treated or demineralized water be used to prevent a reduction in
53. tive 89 336 EEC Council directive on the approximation of the laws of the member states relating to electromagnetic compatibility ISO 1217 Displacement compressors Acceptance tests Stationary Air Compressors Safety rules and code of practice ISO 5388 ISO 8010 Compressors for the process industry Screw and related types Specifications and data sheets for their design and construction ISO 8011 Compressors for the process industry Turbo types Specifications and data sheets for their design and construction ISO 8012 Compressors for the process industry Reciprocating types Specifications and data sheets for their design and construction This standard does not cover those safety aspects of road transport dealt with by EC legislation for trailers These directives applicable to compressors towed on highways are Directive 85 647 EEC Commission directive of 23 December 1985 adapting to technical progress Council directive 71 320 EEC on the approximation of the laws of the member states relating to the braking devices of certain categories of motor vehicles and their trailers Directive 71 320 EEC Council directive 71 320 EEC on the approximation of the laws of the member states relating to the braking devices of certain categories of motor vehicles and their trailers Directive 76 756 EEC Council directive 76 756 EEC on the approximation of the laws of the member states relating to
54. ven in ENV 1070 apply Definitions specifically needed for compressors are listed below and in the standard ISO 3857 1 and ISO 3857 2 3 1 General definitions 3 1 1 compressor A machine which compresses air gases or vapours to a pressure higher than the inlet pressure A compressor comprises the bare compressor itself the prime mover and any component or device supplied which is necessary for safe operation of the compressor 3 1 2 pressure Pressure in this standard means effective gauge pressure unless otherwise stated NOTE The unit bar for pressure is used 1 bar 100 kPa 3 1 3 nominal discharge pressure The pressure at the outlet of the compressor as specified by the manufacturer 3 1 4 maximum allowable working pressure The maximum operating pressure as specified by the manufacturer 3 1 5 maximum allowable working temperature The maximum operating temperature as specified by the manufacturer 3 1 6 hazardous gas or vapour Gas or vapour with chemical radioactive or biological properties such as flammable explosive unstable pyrogenic corrosive caustic toxic carcinogenic which generate hazards by reactions inside the compressor or through dispersal or through reactions with the environment A hazardous gas may be a mixture of gases with these properties 3 1 7 tripping Automatic stopping of a compressor initiated by limiting device 3 2 Definitions of specific compressors 3 2 1 air compressor A
55. y devices essential equipment and accessories for safe adjustment and maintenance 4 8 2 Gas compressors all kinds of safety related devices 4 8 3 Oxygen compressors all kinds of safety related devices 4 8 4 Large compressors essential equipment and accessories for safe adjustment and maintenance 4 8 5 Portable and skid mounted compressors safety signs and tags 5 7 2 2 5 7 2 3 5 7 2 4 5 7 2 5 5 7 2 5a 7 2 9 1 5 8 2 5 8 3 5 8 7 5 8 1 5 6 6 3 1 6 7 2 3 5 8 9 7 3 5 8 1 2 5 8 1 3 5 8 1 4 6 3 2 6 3 3 BSI 1997 5 Safety requirements and measures for all types of compressors 5 1 Mechanical safety 5 1 1 Cutting severing drawing in trapping entanglement friction and abrasion 5 1 1 1 Generally applicable Guards to protect against contact with moving parts shall be installed For specification of guards see 3 22 of EN 292 1 and clause 4 of EN 292 2 and EN 953 and EN 294 The hazards of cutting and severing friction and abrasion shall be minimized See 3 1 and 3 2 of EN 292 2 Atmospheric inlets and inspection openings on inlets shall be provided with protective devices so that persons or foreign matter cannot be drawn in See EN 294 EN 349 and EN 953 5 1 1 2 Large compressors Openings in air and gas inlet ducts intended for internal inspection and maintenance by people inside the ducts shall be provided with interlocking devices or systems to pr
56. ypass which is opened by a certain differential pressure across the filter to ensure a sufficient oil supply 5 5 3 3 Oil lubricated air compressors The design shall be such that the formation of oil coke in the outlet of each compression stage is reduced to a minimum and provision shall be made for the possibility of inspecting and cleaning the air cooler The following outlet temperatures shall not be exceeded under normal conditions when normal compressor oils are used 220 C for single stage compressors with a maximum allowable pressure of not more than 10 bar 200 C for single stage compressors with a maximum allowable pressure of more than 10 bar 180 C for multi stage compressors with maximum allowable working pressure of not more than 10 bar 160 C for multi stage compressors with maximum allowable working pressure of more than 10 bar Temperatures higher than those specified above may be permissible when special lubricants are used and or special precautions have been taken to minimize the formation of oil coke The maximum pressure ratio used shall not create ignition in any of the compression stages See also annex B in particular subclause B 1 2c and ISO 6743 3A and ISO 6743 3B BSI 1997 5 5 3 4 Portable and skid mounted air compressors The risk of spilling when refuelling an internal combustion engine driven portable or skid mounted air compressor shall be minimized Any spillage sh
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