User Manual (eng)
Contents
1. Tel 39 049 89 75 462 5 linee r a FI BOLDRIN S r l Via Pitagora 27 35030 Rubano PD ITALY P P P P P P P P P P ovs o eps m ge m mm va m m TECNOLOGIE PER IL GAS Table 3 Dimensions and weights of the turbine gas meter CGT part 2 Pressure rate PN10 16 PN25 PN40 PN63 ANSII150 ANSI300 ANSI600 PN10 16 PN25 PN40 PN63 ANSII150 ANSI300 ANSI600 Fax 39 049 89 75 474 AINA INA INA INA IA INA FH IA INA HAIN INA n housing versions g from cast irons s from steel with welded connecting pieces f from steel turned Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it 1 5 Construction The turbine gas meter consists of 5 main components Counter he2. 3 08315E 02 8 47089E 04 3 08315E 02 8 47089 04 5 35645E 02 1 47167E 03 Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it nternet http www boldringroup it 1 4 Dimensions The external dimensions of the turbine gas meters can you take from the table 3 An allocation of the parameters takes place according to the figure 1 The dimensions are to be considered when planning from measuring systems 130 BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS figure 1 External dimensions the turbine gas meter CGT Table 3 Dimensions and weights of the turbine gas meter CGT part 1 Pressure Weight rate PN10 16 PN10 16 PN25 40 PN63 ANSII50 ANSII50 ANSI300 600 PN10 16 PN10 16 PN25 40 PN63 ANSII50 ANSII50 ANSI300 600 PN10 16 PN10 16 PN25 40 PN63 ANSII50 ANSII50 ANSI300 ANSI600 PN10 16 PN10 16 PN25 40 PN25 40 PN63 PN63 ANSI150 ANSI150 ANSI300 ANSI300 ANSI600 ANSI600 N10 N10 N16 N16 N25 N25 N40 N40 N63 N63 ANSII50 ANSII50 ANSI300 ANSI300 ANSI600 ANSI600 housing versions g from cast irons s from steel with welded connecting pieces f from steel turned Fax 39 049 89 75 474 E mail dir comm boldrintech it Internet http www boldringroup it
3. rim TECNOLOGIE PER IL GAS TURBINE GAS METER Manual 0 List of contents 1 Design and Function o 1 1 Description 1 2 Function 1 3 Meter sizes 1 4 Dimensions 1 5 Construction 1 5 1 Main housing 1 5 2 Measuring cartridge 1 5 3 Counter head 1 5 4 Flow conditioner 1 5 5 Oil lubrication 1 6 Materials 1 7 Measurement and pulse outputs 1 7 1 Counter head 1 7 2 NF Reed Contacts 1 7 3 NF NAMUR Pulse sensors 1 7 4 HF NAMUR Pulse sensors 1 7 4 1 and HF2 1 7 4 2 HF3 up to HF6 1 7 5 Link specification of the electrical pulse sensors 1 7 5 1 Pulse sensors in the counter head 1 7 5 2 Pulse sensors in the meter body 1 7 5 3 Technical data of the Reed Contacts 1 7 5 4 Technical data of the NAMUR Pulse sensors 1 7 6 Pressure measurement 1 7 7 Temperature measurement 1 8 Designation and signs Measuring values Measuring accuracy 3 1 Error of the measurement principle 3 2 Error of the installation Pressure loss Transport and storage Installation Putting into operation Maintenance and lubrication Verification Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http Wwww boldringroup it F BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS 1 Design and Function 1 1 Description The turbine gas meters CGT serve for the volume measurement of flowing gases They
4. p M Ps Pa Definition Qnis minimum flow value under operating pressure m h Qai minimum flow value according to table 2 m h ip coefficient Pw density of the gas of the verification kg m p density of the operation gas with operating pressure kg m Pg X density of the operation gas with atmospheric pressure according to table 1 kg m p gas overpressure in front of the turbine gas meter bar Pa atmospheric pressure bar The figure 19 shows a diagram to the determination of with determined operating pressure Based on the operating pressure and the temperature it has to be determined the density In dependency of this density values the coefficient 1 can be determined from the right page of the diagram Under help of the formula in the diagram fig 19 it is possible to calculate the appropriate Qmin p under operating pressure by using the value from table 2 Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS P 9 PUU jreuu 3 5168 670 6 xeJ 686 06 PL ned operating pressure and operating Diagram for the determination of the value at defi
5. reference gas density po 1kg m p gas over pressure in front of the meter Ap pressure loss for gas density po Abb 20 atmospheric pressure 1 Ap t mbar E10 0 1 l 10 100 1000 Q m h Figure 20 Pressure loss diagram of the turbine gas meter CGT of a density 1 kg m Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it rin BOLDRIN S r l Via Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http Wwww boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS f In the case if a complete meter run with upstream and downstream pipe temperature pockets and a Sprenkle flow conditioner will be used a calculation of the pressure loss by the same formula is possible The pressure loss value Ap of the complete meter run is to be inferred thereby from the pressure loss diagram in figure 21 Ap Jiu Pa mbar 1000 10 100 10 rot t H 0 1 1 10 100 1000 Q m h Figure 21 Pressure loss diagram meter run of a density 1 kg m 5 Transport and storage The turbine gas meter CGT is a precise measuring instrument and is to handle with the utmost
6. Technical data of the NAMUR Pulse sensors The NAMUR Pulse generators are active sensors and used for low or high frequency output signals They have the following technical data supply voltage 82V supply current inactive low lt L2 mA supply current active high gt 2 1 mA load resistance 1 max switching frequency 5 kHz The circuitry of the electrical connection is represented in figure 9 and the output signals which can be expected in figure 10 8 2V R 1kQ Connection to the Connection to the pulse sensor EE d volume corrector Figure 9 Diagram of connections of the inductive NAMUR initiators U V inactive state U lt 1 2 V active state gt 2 1 V Figure 10 Output signals of the inductive NAMUR initiators 1 7 6 Pressure measurement The measurement of the operating pressure of the turbine gas meter can be done by the reference measuring tap These is available at the front and as doubles at the rear side of meter see fig 3 In that way it will take place at the front without attention of the installation position The thread dimensions for the connection of a screw connector is represented in the figure 11 Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it FIn BOLDRIN S r l Via Pitagora 27 35030 Rubano ITALY f TECNOLOGIE PER IL GAS Fax 39 049 89 75 474 E mail d
7. 3 sensors or on customer s request in the counter head The electrical connection to the socket is to be implemented over a plug of the company Tuchel with the designation C091 31 H006 100 6 An information plate see fig 15 ofthe electrical specification of the socket is positioned on the rear side of the counter head 1 7 5 2 Pulse sensors in the meter body The position and the connectors of the possible pulse generators in the meter body are represented in the figure 3 The detection of the electrical impulses to the customer installation is made by the respective plugs at the sensor The electrical connection could be realised to the 4 pin plug by a coupling socket of the company Tuchel with the designation C091 31 D004 100 2 An equipment of the meter with these sensors has to be required in the meter order A retrofit is possible only if the appropriate drilling with a thread hole M16x1 5 is available in the meter body according to figure 8 This retrofitting can be done by the manufacturer only or executed by assigned technical personnel Thread hole Figure Assembly hole for the HF Pulse sensors HF3 up to HF6 in the meter body 1 7 5 3 Technical data of the Reed Contacts The Reed Contacts are passive sensors and used for low frequency output signals only They have the following technical data max switching voltage 24V max switching current 100 mA contact resistance 0 15 Q max switching frequency 500 Hz 1 7 5 4
8. existing reference wheel generates the pulses in up to two approximation initiators see fig 4 You find a representation of the position as well as the connection possibilities in the figures 6 and 7 Figure 4 Representation of the HF pulse sensors and HF2 in the counter head 1 7 4 2 HF3 up to HF6 The pulse sensors HF3 up to HF6 are positioned in the meter body see fig 3 The pulses of the turbine wheel are generated by the sensors HF3 and HF4 and the pulses of the reference wheel by the sensors HF5 and HF6 whereby the last two are only possible starting from the meters with nominal size DN100 Because the reference wheel is positioned on the same shaft like the turbine wheel and the numbers of frames on the reference wheel and the shovels of the turbine wheel are the same all four pulse generators have the same output frequency The sensors are approximation initiators and possess in each case a separate plug see fig 5 Figure 5 Pattern of the connectors of the HF pulse sensors HF3 up to HF6 in the meter body 1 7 5 Link specification of the electrical pulse sensors Whether a pulse sensor is available and which impulse value of these possesses you can take from the pulse generator sign of the turbine gas meter fig 14 NF1 magnet 2 4 signal plate 1 HF 2 Lr a A UU UFU TT 2 2277 n 12 D 7777 st Ye TIT CA I N X
9. meter was designed according to the laws of the mechanical measuring technique of liquids and gases Counter sums up the passed gas volume and brings it to the display Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS 1 3 Meter sizes The standard sizes of the BOLDRIN turbine gas meters are arranged in table 2 On request also the supply of larger nominal sizes is possible Table 2 Standard sizes of the turbine gas meters CGT maximum flow Qm m h minimum flow m h Measure ment range 4 Counter head pulse rate U m Imp HF2 Counter head 1 84929 04 HF6 Turbine and Reference wheel m Imp 6 10862E 06 3 69858E 04 1 01810E 05 9 24645 04 2 34947E 05 1 185 19E 03 3 26246E 05 2 12954E 03 5 86196E 05 7 22932E 04 3 40498E 05 1 44586E 03 5 95871E 05 2 58587E 03 1 06569E 04 2 58587E 03 1 06569E 04 4 57365E 03 1 50792E 04 7 75761 03 2 55706 04 8 61957E 03 2 84185E 04 8 61957E 03 2 84185E 04 1 44586E 02 4 76697E 04 1 72391E 02 4 73641E 04 1 72391E 02 4 73641 04 2 97619 02 8 17701E 04
10. temperature Figure 19 SVO 315 O1OND41L ATWLI Gd oueqns OEOSE LZ ejobeyd rs PU plon 9 3 2 Error of the installation Turbine gas meters are inferential gas meters and therefore dependent on the direction distribution and the homogeneity of the gas flow The integrated flow conditioner guarantees under considering of the minimum requirements as per OIML recommendation IR 32 89 also without additional flow conditioner in the upstream pipe the adherence of the error limits There it means that with an upstream pipe length of 2xD regardless of any perturbations the error deviation is not larger than 0 3 In the case of pulsating or intermittent gas flows which cause a run after of the turbine wheel of over 1 in relation to the operation flow a turbine gas meter without special add on modules is not suitable In these cases volume measuring instruments should be used as for example the BOLDRIN rotary gas meters CGR 4 Pressure loss The gas meter causes an inevitable pressure loss This 1s limited by the maximum value according to DIN 33800 The pressure loss values of the individual nominal sizes at a gas density 1kg m that can be taken from the diagram of the figure 20 The real pressure loss is calculated according to the following formula p Pat p Ap 3 Po Pa Definition p gas density according to table 1 operating pressure loss po
11. were developed by the company BOLDRIN in close co operation with the oil and gas industry The standard version is appropriate for the gases in table for pressure rates up to 100 bar The operating pressure amounts to thus 0 to pmax the appropriate pressure rate of the meter Table 1 List of appropriate gases for the measurement with turbine gas metes in standard version Symbol chemical formula Density Density kg m relating to air Argon Ethylene Butan Ethan Natural gas Helium Carbon dioxide Carbon monoxide Air Methan Propane Nitrogen Hydrogen p at 1 01325 bar and 273 15 The gas meters are specified by the following parameters Nominal size DN maximal operating pressure pmax as well as maximum flow Qmax and minimum flow Qmin under operating pressure and operating temperature The admissible error between Qmax and Qmin under operating conditions is determined by the margins of error of turbine gas meters as per EEC guideline for volume gas meters The minimum flow results from the pattern approval the Verification Ordinance General Provisions annex 7 and TRG 7 for testing with high pressure gas 1 2 Function The measurement principle of the turbine gas meter is based on the proportionality of the linear gas rate for the rotating speed of the turbine wheel in the defined annular space of the measuring cartridge This area of the gas
12. 5 and HF6 The turbine gas meter can be equipped with these sensors according to demand of the customer The output signals are in fixed relation to the rotation of the turbine wheel and can not be changed by the adjustment gear wheels They serve generally the control of line powered volume correctors flow computers or data storage devices The pulses can be transferred over larger distances up to approximately 200 m surely The specifications in the table 2 are approximate values whereby the exact impulse values of an each sensor and meter are determined during the calibration and can deviate from the indicated value in table 2 The technical data please take from the paragraph Technical data of the NAMUR Pulse sensors pulse generators are certified for hazard areas and possess a EEx conformance certificate d 2 2 a o c o o C gt tc Q Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it nternet http www boldringroup it TECNOLOGIE PER IL GAS Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http Wwww boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS 1 7 4 1 HF1 and HF2 This both pulse sensors are positioned in the counter head There
13. DRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS The gas meter loses its permission for the application of custody transfer if a seal were damaged or removed The seal positions can be taken from the figure 23 V z rat gai Figure 23 Seal positions of the turbine gas meter CGT Seals for add on modules are not marked At special information it is pointed out that blind screw connections which are not be used by sensors can be sealed too Also with a break of these apparently unnecessary security seals the calibration validity of the measuring instrument goes out
14. NF2 NM meen Hei Figure 6 Position of the NF and HF pulse sensors in the counter head of the turbine gas meter CGT FS EUN So2 So1 x 36 2 46 20 m 46 16 54 10 5 So2 301 6 6 Socket 4 Socket 1 Socket 2 win Standard connection of the complete version X Alternative connections Figure 7 Diagram of connections of the pulse sensors in the counter head of the turbine gas meter CGT Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it F BER BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it nternet http www boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS 1 7 5 1 Pulse sensors in the counter head The position and the connectors of the possible pulse generators in the counter head are represented in the figures 6 and 7 The standard version contains only the NF Reed contact NF1 All other sensors can be installed on customer s request The connection of the electrical pulses to the installation for clients is made by the sockets Sol and 502 whereby 502 15 installed optionally with more than
15. ad Main housing Measuring cartridge Flow conditioner BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS Figure 2 Sectional view of the turbine gas meters CGT 1 5 1 housing Housings of pressure rates to ANSI 150 and nominal sizes to DN 200 can be made of casting For pressure rates to ANSI 600 the housings in smaller nominal sizes from forging steel are manufactured or welded together with larger nominal sizes from different parts The dimensions and weights of the meters are indicated in table 3 The installation of the meters is made by DIN or ANSI of flanges For detecting of the operating pressure at the meter is at the front and rear side one p connecting piece each in form of a tapped hole M 12 x 1 5 available Starting from nominal size DN 100 the installation of two temperature pockets into the meter body is possible 1 5 2 Measuring cartridge The measuring cartridge contains the turbine wheel and starting from nominal size DN 100 optionally the reference wheel which are hold by means of lubricated or self lubricated ball bearings on the main shaft The rotating motion of the main shaft will be reduced by gear wheels and transferred to the magnetic coupling A direct detecting of the rotating motion of the turbine or reference wheel as high frequency impulse is additionally possible by the optional installation of up to two HF sensors eac
16. ad The specification concerning pulse outputs and their value can be taken from the pulse generator sign on the top side of the counter head fig 14 The flow direction is indicated by arrows fig 16 on the front and rear side of the meter body The marking of the pressure and temperature measuring points takes place at the meter body according to the representation in figure 17 In similar manner also the pulse generators HF3 up to HF6 are marked Figure 13 type plate 335335335 Figure 14 Pulse sensor sign Figure 15 Sign for the connector identification of the pulse generators in the counter head Figure 16 Arrow on the meter body for the specification of the flow direction Figure 17 Information designation for the pressure and temperature measurement Tel 39 049 89 75 462 5 linee r a Fax 39 049 89 75 474 E mail dir comm boldrintech it Internet http www boldringroup it aj BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 E mail dir comm boldrintech it Internet http www boldringroup it FIn BOLDRIN S r l Via Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS f 2 Measuring values The gas volume which flows through a turbine gas meter is displayed by the counter concerning the operating or line conditions pressure temperature an
17. and has a high long term reliability Mostly by Reed Contacts battery powered devices are connected such as volume correctors or tariff devices You find a representation of the position as well as the connection possibilities in the figures 6 and 7 as well as the specification of the pulse values in table 2 The technical data please take from the paragraph Technical data of the Reed Contacts 1 7 3 NF NAMUR Pulse sensor NF NAMUR pulse generators are optionally possible up to two slot initiators NF3 and NF4 in the counter head They are adjusted like the mechanical roll counter and the Reed Contacts and output pulses which are in direct relation to the mechanical display The use of such active pulse generators 15 possible due to increased requirement of electric power consumption generally only with line power devices Thus however pulses can be transferred over larger distances up to approximately 200 m surely You find a representation of the position as well as the connection types in the figures 6 and 7 as well as the specification of the pulse values in table 2 The technical data please take from the paragraph Technical data of the NAMUR Pulse sensors pulse generators are certified for hazard areas and possess a EEx conformance certificate 1 7 4 HF NAMUR Pulse sensor HF NAMUR pulse generators are optionally possible in the counter heading and HF2 at the turbine wheel HF3 and HF4 and at the reference wheel HF
18. caution The following points are to be considered During transportation the meter is not to be thrown or to expose strong vibrations Special caution 1s required for loading and unloaded of high pressure meters in the case of a large mass The transportation of the meter has to be done with emptied storage vessel of the oil pump The meter is to be transported and to be stocked in the appropriate installation position At meters with oil pump it is to be paid attention that they may be brought only briefly into another position than the installation position The gas meter should be transported in the original packaging up to the place of work Removing from fabrication catches and transportation covers is only recommendable at the installation place A raising of the turbine gas meter at the counter head is not admissible For the movement of heavy devices the transport eyes are to be used It is to be paid attention to as dry a storage as possible The meter is to be protected against precipitation and other humidity It is to be made certain that by the transportation and by remove of the packing no verification seal is damaged or 1s removed since otherwise the official verification is lost Storing gas meters do not need to be lubricated For mentioned above transport damages the manufacturer does not take over a warranty 6 Installation Before the gas meter is installed it should be checked again if the meter meets the requir
19. d compressibility only In order to determine a comparable value independently to the respective operating conditions for accounting purposes a conversion of the volume to standard conditions V is used The standard volume determines itself from the following calculation po Ta Vp 273 pat 1 1 Tb Z t 273 where k Z Z Definition Vy operating volume m h Tp standard gas temperature abs 273 15 Va standard volume m h Tn operating gas temperature abs operating pressure at the meter bar k compressibility factor constant or operating over pressure at the meter bar calculation by 88 Pn standard pressure bar 1 01325 bar Z real gas factor t operating gas temperature C Z gas factor standard condition 2 1 The operation volume V of an accounting period determines itself from the difference of the counter statuses of the turbine gas meter the at the beginning and to the end of the period The operation over pressure pa is determined on the reference pressure point p of the meter as average value The operation gas temperature t is determined as average value measured by a temperature sensor in the meter body or in the down stream pipe of the meter in accordance with PTB test rules Volume 20 The compressibility factor is determined by using the gas quality at systems up to 10 bar as constant or at higher pressur
20. dation IR 32 89 annex A with easier and heavy perturbation For installation of BOLDRIN turbine gas meters the conditions of the paragraph 1 of the technical guideline TR G 13 have been valid that means to adherence the measuring accuracy an upstream pipe distance of 2 x DN is sufficient It is to be made certain too that the gas flow does not indicate an intermittent or pulsating character which can cause a tracking error of 2196 In order to achieve a very high measuring accuracy of the gas meter the company offers also complete meter runs with upstream and downstream pipe temperature pockets in the downstream pipe and a BOLDRIN flow straighter This flow straighter is a Sprenkle Flow conditioner according to DIN EN ISO 5167 1 The pressure loss thus increased is to be inferred from the paragraph of the same name The installation of the gas meter has to take place without tension into the piping With larger meters the pipe installation or if necessary the meter is to be supported It is to be made certain that the meter is to be built concentrically into the piping and no seals loom into the piping It has to be paid attention of possible contamination of the gas which can damage the meter and cause an influence of the measuring accuracy strongly If possible a filter has to be installed in front of gas meter which has a fineness of minimal 10um In the starting phase start sieve is recommendable which avoids a damage of the meters by
21. ements of to the gas measuring system Very important is the check of the pressure rate PN of the installation the maximum installation pressure pmax and maximum the flow rate Qinax under operating conditions as well as the right flow direction The preferred position for the installation of the turbine gas meter is an horizontal installation The counter head has to be above in each case A vertical installation has to be adapt by the production Specially the flow direction from down upward is to be avoided and possible only by special manufacturing The gas meter has not to be installed at the deepest point of the installation because otherwise condensate or contamination can settle in the meter and thus the function and measuring accuracy can be affected The installation of turbine gas meters should take place in closed rooms or cabinets if possible In open air installations the meter has to be protected by suitable measures from precipitation contamination or direct sun exposure The area of application is with a gas temperature between 10 C and 60 C The lowest ambient temperature has to be not lower than 25 C The installation into which the turbine gas meter is to be installed is to be conceived according to the technical guideline TR G 13 because otherwise by the manufacturer no warranty for the adherence of the error limits can be given The BOLDRIN turbine gas meter passed the perturbation approval according to the OIML recommen
22. es than variable over calculation methods in accordance with G 486 3 Measuring accuracy Each real measurement is falsified by measurement inaccuracies These errors can be divided at the turbine gas meter in two substantial categories 1 Error by the physical characteristics of the measurement principle 2 Error by the installation conditioned influence of the gas flow 3 1 Error of the measurement principle The measuring characteristic of turbine gas meters 15 represented in figure 18 According to the EWG guideline of volume gas meters the margins of error are determined on the following values Onin m Q where at turbine gas meter 0 2 Qu 7 E Q nin p Q min Q max Q Figure 18 Error characteristic of a turbine gas meter Low pressure error curve High pressure error curve The measurement range of the BOLDRIN turbine gas meters is indicated in table 2 As more highly the operating pressure rises becomes the error curve more flatter see fig 18 and the minimum flow Qmin becomes more smaller within the admissible limits of error Thus a larger measuring range can be obtained with higher operating pressures which can be certified also according to TR 7 up to a relation of 1 50 The on density depending minimum flow value Qmin p can be calculated according to the following relation 1 013 Qoi Qmin p Qnin ip Qinin 1 1 2
23. h 1 5 3 Counter head The transfer of the angular momentum from the main housing loaded by pressure into the counter head is made by a gas tight magnetic coupling In the counter heading a further reduction of the rotating speed of the waves is made by snail and gear wheels up to the drive of the 8 digit roll counter A gear set is to be implemented changeable to realise an adjustment of the roll counter To pick up electrical impulses is given a possibility by up to two HF Namur sensors up to two NF Namur sensors and up to two NF Reed contacts As standard each counter is equipped with one NF Reed contact The electrical connection to take the impulses from the counter head can take place over up to two sockets whereby one socket is installed as standard The output signals of the HF sensors in the counter operate adjustment independently proportionally to the HF sensors on the turbine or reference wheel of the meter 1 5 4 Flow conditioner The turbine gas meter has an integrated flow conditioner on the upstream site This ensures according to our PTB certification that the request of the OIML recommendation IR 32 89 as well as the TRG 13 are fulfilled concerning the incident flow 1 5 5 Oil lubrication Main shaft bearing of the turbine gas meters CGT can be executed self lubricated or with lubrication over oil pump For the periodic lubrication the meter is equipped with a hand oil pump with oil reservoir for an oil amount of filli
24. he meter body as well as the oil pump are manufactured from aluminium alloys Moved parts like shafts snails or bearings consist of stainless steel Gear and snail wheels are manufactured from plastic The transparent parts like counter displays or the oil reservoirs of the oil pump consist of polycarbonates 1 7 Measurement and pulse outputs Plugs for electric outputs Counter HF4 pulse sensor ee i HF5 pulse sensor HF6 rear side invisible HF3 pulse sensor K Temperature sensor Oil reservoirs Pressure tap Oil pump Figure 3 Measurement outputs of the turbine gas meter CGT 1 7 1 Counter head The mechanical 8 digit roll counter head is the main counter of the turbine gas meter CGT It displays the passed gas volume at operating pressure and operating temperature Depending of the meter size the display value corresponds to the lowest place 0 01 m up to 1 m The counter head is rotatable around 345 so that it is configurable into almost all directions in order to ensure a good readability in all installations 1 7 2 NF Reed Contact In the counter head Reed Contacts and NF2 are available depending upon execution up to two whereby one Reed Contact is equipped as standard They are adjusted like the mechanical roll counter and output pulses which are in direct relation to the mechanical display This type of contacts is electric potential free
25. ion briefly large gas flows can occur which can load then the gas meter over the permitted flow and destroy the measuring cartridge Filling the pipe installation by the installed turbine gas meter should be avoided You find an example of the structure of a measuring system in figure 22 case a bypass in the installation is available is before opening the valves 1 and 2 pre and behind the gas meter the following piping through to open the valve 4 to be filled Afterwards over a needle valve 5 if it is available or by very slow opening of input valve 1 the meter can be set under operating pressure After it the output valve 2 is only opened slowly As last step may not be forgotten to close the valves 4 and 5 again with absence of the bypass at first the meter 15 by slow opening of the output valve 2 to connect with that follows installation Afterwards very slowly and carefully the input valve 1 15 to be opened whereby the danger of the brief overload 15 very large here for the purpose of the disassembly the meter installation has to be emptied If a bypass is available the valve 4 is opened as the first one The meter has to be separated from the gas flow by slowly close from the input valve 1 and the output valve 2 Afterwards the gas meter is to be emptied over the bleed valve 3 slowly Figure 22 Pattern of a measuring system with bypass 8 Maintenance and lubrication Turbine gas meters has to be serviced from inst
26. ir comm boldrintech it Internet http www boldringroup it Tel 39 049 89 75 462 5 linee r a rim BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS Figure 11 Dimensions of the reference measuring tap 1 7 7 Temperature measurement The measurement of the operating temperature can take place in the turbine gas meter of the nominal size DN100 or larger by means of a temperature pocket installed in the down stream part of the meter body see fig 3 The assembly of a second temperature pocket for the reference measurement is oppositely in the area with the same flow condition in the meter possible In standard version no temperature pockets are installed but can be ordered however as accessories Temperature pocket possess an internal thread 1 4 for the installation of a temperature sensor with a diameter of 6mm The installation length please take from the figure 12 According to the request of the local verification offices the temperature pocket is to be filled with heat conducting oil or heat conducting paste Wily zz IEE a t s a a aa ZA DN 100 150 200 250 300 L mm 66 66 72 78 78 Figure 12 Temperature pocket for the installation into the turbine gas meter CGT 1 8 Designation and signs The technical basic parameters of the turbine gas meter are noted on the type plate fig 13 It is equipped on the front of the counter he
27. ng up to 20 cm other bearings are self lubricated Depending on the gas flow direction and installation position the oil pump can be attached in such a way that an operation of the front is possible Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it rim BOLDRIN S r l Via Pitagora 27 35030 Rubano PD ITALY TECNOLOGIE PER IL GAS rir BOLDRIN S r l Pitagora 27 35030 Rubano PD ITALY f Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it TECNOLOGIE PER IL GAS 1 6 Materials All by the construction of the turbine gas meters CGT used materials guarantee the necessary stability and corrosion resistance The meters are material technically checked before distribution Appropriate certificates in accordance with DIN EN 10204 can be requested Meter bodies of the nominal sizes to including DN150 and pressure rates to PN16 can be made from cast irons EN GJS 400 15 or of steel ST3S For bodies of the pressure rates up to ANSI 600 steel 18G2 or 19G2 is used The housings are galvanised and outside coated with varnish paint Depending on the meter size the integrated flow conditioner is manufactured from plastic or metal components aluminium alloys partly combined with stainless steel The turbine wheel the measuring cartridge t
28. ominal size Stroke rate DN50 DN80 DN100 DN150 DN200 DN 250 DN300 At each lubricating the oil level in the storage vessel of the oil pump is to be controlled To the refill Lubrina oil of the company BOLDRIN is recommended The following Lubrina types of oil are offered by BOLDRIN for it DN50 and 0380 Lubrina Ol L12 Viscosity approx 12 mm s at 20 C 2DNI100 Lubrina Ol L23 Viscosity approx 23 mm s at 20 C For in table 1 specified gases the following of oils can be used too DN50 and DN80 Isoflex PDP 10 2DNI100 Isoflex PDP38 or Aeroshell Fluid 12 9 Verification The turbine gas meter CGT of the company BOLDRIN possesses an EEC pattern approval for custody transfer After the EEC initial verification the meter will be sealed and is thus usable for the period of the calibration validity period according to Verification Ordinance General Provisions appendix B for custody transfer Reverification or an in service testing can be executed by each accredited testing laboratories d 2 2 a o m c o o S gt Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm gboldrintech it Internet http www boldringroup it TECNOLOGIE PER IL GAS Tel 39 049 89 75 462 5 linee r a Fax 39 049 89 75 474 E mail dir comm boldrintech it nternet http www boldringroup it mm BOL
29. ructed technical personnel only Strong operation noises or jerky run point on a damage of the gas meter Additional there is a controllability if pulses of the reference wheel and the turbine wheel of the turbine gas meter are compared by a volume corrector or a flow computer The deviations of the relation of the calibrated impulse values must be below 1 In these cases the meter is to be repaired by the manufacturer or a certified workshop To put the meter into custody transfer again the meter has to be official verified one s more Turbine gas meters with oil pump are to be lubricated periodically Depending of the composition of the gas escort substances and the stressing of the turbine gas meter by the measurement application of gases of the 2 gas family according to 260 1 a lubrication all 1 to 2 months is recommend With the application for the measurement of rotten gas strongly dirty or other aggressive gases the reduction of the lubrication interval by time weekly is necessary For measurement other gases please co ordinate the lubricant with our factory which can be used Depending upon pressure range the turbine gas meter can be equipped with a pushbutton oil pump or a lever oil pump A complete stroke of the oil pump supplies approx oil to the main bearings The recommended stroke rate for a lubrication cycle is indicated in table 4 Table 4 Recommended stroke rate of the oil pump for each lubrication cycle N
30. welding or installation pollution This is to be removed however after some time again from the pipe installation in the case of contamination which were held back by the start sieve will generate a flow disturbance which can have an influence on the measuring accuracy The manufacturer of the turbine gas meters does not take responsibility for damage to the gas meter which from insufficient filtering or contamination in the piping results Fax 39 049 89 75 474 E mail dir comm boldrintech it Internet http www boldringroup it Tel 39 049 89 75 462 5 linee r a BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS f Fax 39 049 89 75 474 Tel 39 049 89 75 462 5 linee r a E mail dir comm boldrintech it Internet http www boldringroup it BOLDRIN S r l Pitagora 27 35030 Rubano ITALY TECNOLOGIE PER IL GAS The connection of volume correctors and add on modules has to take place using the prescribed plug connectors paragraph link specification of the electrical pulse generators 7 Putting into operation If the gas meter is equipped with an oil pump the bearings have to be lubricated in accordance with servicing instruction before start up During the admission of the turbine gas meter with operating pressure largest caution is required because by the difference of pressure for pressure free subsequent installat
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