TECHNICAL SERVICE MANUAL
Contents
1. FIGURE 6 LENGTH L FOR 0 001 ADDITIONAL END CLEARANCE STANDARD END LENGTH L CLEARANCE TABLE 2 BEARING HOUSING ADJUSTMENT FOR END CLEARANCE FOR AX PUMPS SECTION TSM 633 ISSUE A PAGE 7 OF 8 TECHNICAL SERVICE MANUAL INSTALLATION OF CARBON GRAPHITE BUSHINGS When installing carbon graphite bushings extreme care must be taken to prevent breaking Carbon graphite is a brittle material and easily cracked If cracked the bushing will quickly disintegrate Using a compatible lubricant will help in installation The additional precautions listed below must be followed for proper installation 1 2 3 4 A press must be used for installation Be certain bushing is started straight Do not stop pressing operation until bushing is in proper position Starting and stopping will result in a cracked bushing Check bushing for cracks after installation Carbon graphite bushings with extra interference fits are frequently furnished for high temperature operation These bushings must be installed by a shrink fit 1 2 3 Heat bracket or idler to 750 F Install cool bushing with a press If facilities are not available to reach 750 F temperature it is possible to install with 450 F temperature however the lower the temperature the greater the possibility of cracking the bushing Consult local distributor with specific questions on high temperature applications FLUID amp METERING2. CARTRIDGE MECHANICAL SEAL INSTALLATION 1 NOTE Burrs left on shaft can damage O rings on seal sleeve during installation Inspect shaft for burrs and remove any found with a fine grade of emery cloth Clean rotor shaft and face of seal chamber on bracket Place tapered installation sleeve on shaft Coat rotor shaft tapered installation sleeve and O rings in the inside diameter of cartridge seal sleeve with a generous amount of light oil See Figure 3 TAPERED INSTALLATION SLEEVE DANGER Before starting pump be sure all drive equipment guards are in place Failure to properly mount guards may result in serious injury or death DISASSEMBLY DANGER Before opening any Viking pump liquid chamber pumping chamber reservoir etc Be sure 1 That any pressure in the chamber has been completely vented through the suction or discharge lines or other appropriate openings or connections FIGURE 3 2 That the driving means motor turbine engine 4 Slide cartridge seal over installation sleeve on shaft until etc has been OC LER OU OT MAGE mee it contacts the seal chamber face Be sure the flush port operational so that it cannot be started while Opening on the seal gland is at the 12 o clock position work is being done on pump Remove tapered installation sleeve from shaft 3 That you know what liquid the pump has been 5 Secure seal gland to bracket face using nuts Item 16 handling and the precau
3. reassembling pump THREAD SIZE 120 160 165 200 Q QS and N 170 190 235 255 OR 280 270 340 365 TABLE 1 LOCKNUT TORQUE tang of lockwasher into slot of locknut 8 Adjust pump end clearance per End Clearance Adjustment page 7 MINIMUM LENGTH OF JACK SCREWS A i 1 25 1 25 5 16 18 UNC 7 16 14 UNC 7 16 14 UNC 1 2 13 UNC 9 Tighten setscrews on cartridge seal drive collar to shaft and remove or turn seal centering clips so as to clear the seal drive collar NO SCREWS THREAD SIZE 10 Turn shaft by hand or jog motor to check seal drive collar for runout 11 Connect flush plan or barrier fluid lines or vent stuffing box if no flush plan until liquid is present in stuffing box Install pipe plugs in any remaining port openings in the seal gland L K S R 1 2 13 UNC 5 8 11 UNC FIGURE 4 SECTION TSM 633 NOTE For maximum seal life flush plan should be used 12 Replace window guard on bracket ISSUE A PAGE 5 OF 8 TAPERED ROLLER BEARING BEARING HOUSING END CAP SETSCREW LIPSEAL LOCKWASHER OUTER SPACER COLLAR INNER SPACER COLLAR 10 SECTION TSM 633 LOCKNUT SHAFT END CAP SETSCREW FIGURE 5 Do not allow idler Item 37 to fall from idler pin Tilt top of head back when removing to prevent this Avoid damaging head gasket Item 35 lf pump has jacketed head plate not illustrated it will separ
4. 1 That any pressure in the chamber has been CCW to remove the bearing housing assembly from the completely vented through the suction or discharge bracket Item 27 lines or other appropriate openings or connections 3 Remove window guard Item 64 from bracket 2 That the driving means motor turbine engine etc has been locked out or made non operational so that it cannot be started while work is being done on pump 3 That you know what liquid the pump has been handling and the precautions necessary to safely handle the liquid Obtain a material safety data sheet MSDS for the liquid to be sure these precautions are understood 4 Remove the pair of half round rings Item 11 under the inner spacer collar Item 8 from the shaft for KK and LS size pumps There are no half round rings on all other size pumps 5 If flush plan or barrier fluid tubes are connected to the seal gland Item 19 turn off and disconnect before removing seal Also remove all pipe plugs from seal gland for ease of removal through bearing housing opening Place set clips on seal Loosen the set screws Failure to follow above listed precautionary measures on the cartridge seal collar to free the cartridge seal may result in serious injury or death from the shaft Remove nuts and washers from studs Remove all fittings and pipe plugs from seal gland Slide cartridge seal out through bearing housing opening SECTION TSM 633 ISSUE A PAGE 4 OF 8
5. NAME OF PART ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART ee e fanas mT so iomete Ta iewes O Sor Seal Ss Casing Farge eoa wastes End Cap 19 Cartridge Seal Head Gasket En Studs for Flanges Studs for Drain Port Bearing Spacer Coler Oue 25 BracketBushing 38 Rotor ana ShaftAscombyy 51A 6 Tapered Roler Bearings 28 CapsorewiStudforBracket 38 iater Bushing 52A Nuts tor Drain Pon B Bearing Spacer Collar Inner HL QS 29 Bracket Gasket sss 40 Head and Idler Pin Assembly 64 Guard Cm Rings HafRound KK ALS 30 PipePug d C A CapsrensiStudforHead 2 Greaseriting SOA PePug a CARTRIDGE MECHANICAL CARTRIDGE MECHANICAL SEAL REPLACEMENT SEAL REMOVAL MODELS 1 Insert brass or plastic bar into one of the pump ports and HL KK LS Q QS N R into the space between rotor teeth to prevent rotor and a a shaft from spinning If removing the seal while pump is installed lock shaft to prevent spinning Bend up tang of lockwasher Item 2 with flat bladed screw driver or small flat punch and a hammer With a spanner wrench DANGER remove locknut Item 1 from shaft Item 36 Remove lockwasher from shaft For complete pump disassembly and assembly see pages 5 and 6 Before opening any Viking pump liquid chamber pumping chamber reservoir etc Be sure 2 Loosen two set screws in the face of the bearing housing Item 7 see Figure 5 and turn the bearing housing
6. number and serial number are on the nameplate In the Viking model number system basic size letters are combined with the series number 4223AX and 4323AX indicating the basic pump construction material This manual deals only with Series 4223AX and 4323AX Heavy Duty Jacketed Bracket Mounted Pumps Refer to Figures 1 through 6 for general configuration and FIGURE 1 nomenclature used in this manual Pump specifications and SIZES HL QS recommendations are listed in Catalog Section 633 Heavy Duty Jacketed Bracket Mounted Pumps with Bracket for API682 compliant seals FIGURE 2 SIZES N and R FLUID amp METERING VIKING PUMP INC e A Unit of IDEX Corporation Cedar Falls IA 50613 USA SAFETY INFORMATION AND INSTRUCTIONS IMPROPER INSTALLATION OPERATION OR MAINTENANCE OF PUMP MAY CAUSE SERIOUS INJURY OR DEATH AND OR RESULT IN DAMAGE TO PUMP AND OR OTHER EQUIPMENT VIKING S WARRANTY DOES NOT COVER FAILURE DUE TO IMPROPER INSTALLATION OPERATION OR MAINTENANCE THIS INFORMATION MUST BE FULLY READ BEFORE BEGINNING INSTALLATION OPERATION OR MAINTENANCE OF PUMP AND MUST BE KEPT WITH PUMP PUMP MUST BE INSTALLED OPERATED AND MAINTAINED ONLY BY SUITABLY TRAINED AND QUALIFIED PERSONS THE FOLLOWING SAFETY INSTRUCTIONS MUST BE FOLLOWED AND ADHERED TO AT ALL TIMES Warning In addition to possible serious Symbol Danger Failure to follow the indicated injury or death failure to follow the Legend a may ESO SROS Ury TOR
7. on casing Pump head and casing were marked before disassembly to insure proper reassembly If not be sure idler pin which is offset in pump head is positioned equal distance between port connections to allow for proper flow of liquid through pump If pump is equipped with jacketed headplate install at this time along with new gasket Tighten head capscrews or nuts evenly per TR 804 Capscrew Torques Install seal Refer to Cartridge Mechanical Seal Installation Page 5 Slide inner spacer collar over shaft for H QS sizes N R sizes do not have an inner spacer collar For KK LS size pumps the recessed end of the collar should be facing head of pump HL Q QS and R size bearing spacer collars are not recessed Place pair of half round rings on shaft if applicable and slide inner bearing spacer collar over half round rings to lock them in place There is no pair of half round rings on the HL Q QS and R size pumps Turn the bearing housing CW into the bracket until the flange on the bearing housing is 1 2 from the face of the bracket lf damaged replace and install lip seal into bearing housing See Figure 5 for lip seal orientation Pack tapered roller bearings with grease and press or push bearings into housing with large end of inner races together It is possible to install bearings incorrectly For proper assembly see Figure 5 10 11 12 13 14 15 If damaged replace and install the lip s
8. API COMPLIANT HEAVY DUTY JACKETED PUMPS SIZES HL KK LS Q QS N R VIKING PUMP INC A Unit of IDEX Corporation Cedar Falls IA 50613 USA SECTION TSM 633 PAGE 8 OF 8 ISSUE A XPD 676 SERIES 4223AX AND 4323AX VIKING PUMP FLUID amp METERING WARRANTY Viking warrants all products manufactured by it to be free from defects in workmanship or material for a period of one 1 year from date of startup provided that in no event shall this warranty extend more than eighteen 18 months from the date of shipment from Viking The warranty period for Universal Seal series pumps ONLY is three 3 years from date of startup provided that in no event shall this warranty extend more than forty two 42 months from the date of shipment from Viking The warranty period for XPD 676 series pumps ONLY is five 5 years from date of startup provided that in no event shall this warranty extend more than sixty six 66 months from the date of shipment from Viking Thrust bearings for XPD 676 pumps ONLY are warranted for 36 months from date of startup or 42 months from date of shipment from Viking UNDER NO CIRCUMSTANCES SHALL VIKING BE LIABLE UNDER THIS WARRANTY OR OTHERWISE FOR SPECIAL INCIDENTAL INDIRECT CONSEQUENTIAL OR PUNITIVE DAMAGES OF ANY KIND INCLUDING BUT NOT LIMITED TO LOST OR UNREALIZED SALES REVENUES PROFITS INCOME COST SAVINGS OR BUSINESS LOST OR UNREALIZED CONTRACTS LOSS OF GOODWILL DAMAGE TO REPUTA
9. Electronic copies of the most current TSM issue can be found on the Viking Pump website at www vikingpump com TECHNICAL SERVICE MANUAL XPD 676 API COMPLIANT HEAVY DUTY JACKETED PUMPS SERIES 4223AX AND 4323AX SIZES HL KK LS Q QS N R SECTION TSM 633 PAGE 1 OF 8 ISSUE A CONTENTS l l UNMOUNTED PUMP UNITS Safety Information and Instructions 2 Special Information aoaaa aa 3 MECH SEAL AX API 676 Fully Compliant Maintenance 3 Cartridge Mechanical Seal a a aa aaa aa 4 Blea Units are designated by the unmounted Replacement 00004 4 KK4223AX pump model numbers followed by a Removal 2 0 0 00 ee 4 LS4223AX letter indicating drive style Installation lt lt s i cssc meast ee mai 5 Q4223AX Ss eiprecee ad Disassembly 0000 eee 5 qQsa223ax ee Aecerabl y 6 QS4223AX R Viking Speed Reducer End CI Jas Adi l i eee 7 N4323AX P Commercial Speed Reducer nd Clearance Adjustment 7 RT Installation of Carbon Graphite Bushings Warranty a oe oa em ea SK Be we we ee Ge Boe 8 INTRODUCTION The illustrations used in this manual are for identification purposes only and cannot be used for ordering parts Obtain a parts list from the factory or a Viking representative Always give the complete name of the part part number and material with the model number and serial number of the pump when ordering repair parts The unmounted pump or pump unit model
10. MNG indicated instruction may cause damage A WARNING WARNING Pip PPP SECTION TSM 633 BEFORE opening any liquid chamber pumping chamber reservoir relief valve adjusting cap fitting etc be sure that e Any pressure in the chamber has been completely vented through the suction or discharge lines or other appropriate openings or connections e The pump drive system means motor turbine engine etc has been locked out or otherwise been made non operational so that it cannot be started while work is being done on the pump e You know what material the pump has been handling have obtained a material safety data sheet MSDS for the material and understand and follow all precautions appropriate for the safe handling of the material BEFORE operating the pump be sure all drive guards are in place DO NOT operate pump if the suction or discharge piping is not connected DO NOT place fingers into the pumping chamber or its connection ports or into any part of the drive train if there is any possibility of the pump shafts being rotated DO NOT exceed the pumps rated pressure speed and temperature or change the system duty parameters from those the pump was originally supplied without confirming its suitability for the new service BEFORE operating the pump be sure that e Itis clean and free from debris e all valves in the suction and discharge pipelines are fully opened e All piping connected
11. TION LOSS OF PROPERTY LOSS OF INFORMATION OR DATA LOSS OF PRODUCTION DOWNTIME OR INCREASED COSTS IN CONNECTION WITH ANY PRODUCT EVEN IF VIKING HAS BEEN ADVISED OR PLACED ON NOTICE OF THE POSSIBILITY OF SUCH DAMAGES AND NOTWITHSTANDING THE FAILURE OF ANY ESSENTIAL PURPOSE OF ANY PRODUCT THIS WARRANTY IS AND SHALL BE VIKING S SOLE AND EXCLUSIVE WARRANTY AND SHALL BE IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ALL WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT ALL OF WHICH OTHER WARRANTIES ARE EXPRESSLY EXCLUDED See complete warranty at www vikingopump com All rights reserved 4 2015 Viking Pump Inc
12. ate from head when it is removed Avoid damaging the gasket between the jacketed head plate and pump head Remove idler and bushing assembly Insert brass or plastic bar into one of the pump ports and into the space between rotor teeth to prevent rotor and shaft from spinning Bend up tang of lockwasher with flat bladed screw driver or small flat punch and a hammer With a spanner wrench remove locknut from shaft Remove lockwasher from shaft Loosen two set screws in the face of the bearing housing see Figure 5 and turn the bearing housing CCW to remove the bearing housing assembly from the bracket Remove bracket window guard from bracket Remove the pair of half round rings under the inner spacer collar from the shaft for KK and LS size pumps There are no half round rings on all other size pumps If flush plan or barrier fluid tubes are connected to the seal gland turn off and disconnect before removing seal Remove all pipe plugs from seal gland Loosen the set screws on the cartridge seal collar to free the cartridge seal from the shaft Remove nuts and washers from studs Slide cartridge seal out through bearing housing opening Carefully remove rotor and shaft to avoid damaging bracket bushing Item 25 Loosen two radial setscrews in flange of bearing housing With a spanner wrench remove the outer end cap Item 3 with lip seal Item 5 and outer bearing spacer collar Item 4 see Figure 5 above Remove both tapered
13. drive equipment guards are in place Failure to properly mount guards may result in serious injury or death END CLEARANCE ADJUSTMENT 1 Seal design varies from manufacturer to manufacturer Consult seal supplier instructions or representative for recommendations on disengaging the seal from the shaft prior to end clearance adjustment Loosen the two set screws in the outer face of the bearing housing see Figure 5 and turn the thrust bearing assembly clockwise until it can no longer be turned by hand Turn the bearing housing counter clockwise until the rotor and shaft can be turned by hand but with a noticeable drag Make an axial mark across both the bearing housing and bracket For standard end clearance turn the thrust bearing assembly CCW the required length measured on the outside diameter of the bearing housing from the mark on the bracket see Table 2 Tighten the two set screws in the outboard face of the bearing housing with equal force against the bracket NOTE Be sure the shaft can rotate freely If not either perform the end clearance adjustment again or disassemble the pump and look for damage to the pump components Engage seal to shaft per seal manufacturers instructions High viscosity and high temperature liquids require additional end clearances The amount of extra end clearance depends on the viscosity of the liquid pumped For specific recommendations consult your local distributor
14. eal in the end cap See Figure 5 for lip seal orientation Thread the end cap into the bearing housing along with outer bearing spacer collar and tighten against the bearing Tapered roller bearings require preload to operate properly To set preload tighten end cap so that inner races of bearings cannot be rotated by hand Make a mark on the outside diameter of the bearing housing and a corresponding mark on the bearing housing end cap Rotate the bearing housing end cap in a counter clockwise direction until the mark on the outside diameter of the bearing housing is past the mark on the bearing housing end cap by 5 16 This will provide the correct end play for the bearings Lock end cap in place with two end cap setscrews in the flange of the bearing housing see Figure 5 Put lockwasher and locknut on shaft Insert length of plastic or brass through port opening between rotor teeth to keep shaft from turning Tighten locknut per Table 1 Bend one tang of lockwasher into slot of locknut If tang does not line up with slot tighten locknut until it does Failure to tighten locknut or engage lockwasher tang could result in early bearing failure and cause damage to pump Remove length of plastic or brass from port opening Adjust pump end clearance per End Clearance Adjustment Lubricate all grease fittings with multi purpose polyurea grease NLGI 2 Replace guard on bracket DANGER Before starting pump be sure all
15. et and head provide large chambers at both ends of the pumping chamber and around the stuffing box for temperature control of the product in the pump Check the pump to be sure it is heated to operating temperature prior to startup MECHANICAL SEALS Extra care should be taken in repair of these pumps Be sure to read and follow all special instructions supplied with your pump MAINTENANCE Series 4223AX and 4323AX pumps are designed for long trouble free service life under a wide variety of application conditions with a minimum of maintenance The points listed below will help provide long service life LUBRICATION Grease all grease fittings every 2000 hours of operation If service is severe grease more often Grease must be applied slowly with a hand gun until the grease exiting the lip seal or relief plug is similar in consistency and color to the new grease Use a NLGI 2 polyurea base grease for normal applications For hot or cold applications use appropriate grease Consult factory with specific lubrication questions CLEANING PUMP Keep pump as clean as possible This will facilitate inspection adjustment and repair work and help prevent overlooking a dirt covered grease fitting LIFTING There is a lift eye on the bracket behind the casing for HL QS size pumps This is intended for the pump only not the entire unit STORAGE If pump is to be stored or not used for six months or more pump must be drained and a lig
16. ht coat of light oil must be applied to all internal pump parts Lubricate fittings and apply grease to pump shaft extension Viking suggests rotating pump shaft by hand one complete revolution every 30 days to circulate the oil Tighten all pump assembly bolts before putting pump in service after being stored SUGGESTED REPAIR TOOLS The following tools must be available to properly repair series 4223AX and 4323AXpumps These tools are in addition to standard mechanics tools such as open end wrenches pliers screwdrivers etc Most of the items can be obtained from an industrial supply house 1 Soft Headed Hammer 2 Allen wrenches 3 See TR 813 for locknut tools Commercially available adjustable hook spanner wrenches are available for locknut removal below Sources 471 J H Williams amp Co or equal for H KK sizes 472 J H Williams amp Co or equal for LQ QS sizes 474 J H Williams amp Co or equal for N size 474A J H Williams amp Co or equal for R RS sizes 4 Spanner wrench adjustable face spanner pin type for use on bearing housing endcap Sources 482 J H Williams amp Co or equal for H LS sizes 483 J H Williams amp Co or equal for Q RS sizes Brass or plastic bar Arbor press SECTION TSM 633 ISSUE A PAGE 3 OF 8 EXPLODED VIEW PARTS FOR SERIES 4223AX MODELS Onn SO O D o A 02O O EXPLODED VIEW PARTS FOR SERIES 4323AX MODELS ITEM
17. roller bearings Item 6 and inner bearing spacer collar from the bearing housing ISSUE A PAGE 6 OF 8 11 12 Clean all parts thoroughly and examine for wear and damage Check lip seals roller bearings bushings and idler pin and replace if necessary Check all other parts for nicks burrs excessive wear and replace if necessary Wash bearings in clean solvent Blow out bearings with compressed air Do not allow bearings to spin turn them slowly by hand Spinning bearings will damage race and rollers Make sure bearings are clean then lubricate with light oil and check for roughness Roughness can be determined by turning outer race by hand Casing inner diameter can be checked for wear or damage while mounted on bracket ASSEMBLY 1 If the pump has carbon graphite bushings Refer to Installation of Carbon Graphite Bushings page 7 If the bracket bushing is worn replace If bracket bushing has a lubrication groove install bushing with groove at 12 o clock position in bracket Coat shaft of rotor shaft assembly with light oil Start end of shaft in bracket bushing turning from right to left slowly pushing rotor into casing If replacing carbon graphite idler bushing Refer to Installation of Carbon Graphite Bushings page 7 Coat idler pin with light oil and place idler and bushing on idler pin in head Inspect head o ring for damage If damaged use a new head o ring install head and idler assembly
18. tenance and for inspection during operation to check for leakage and monitor pump operation SPECIAL INFORMATION DANGER Before opening any Viking pump liquid chamber pumping chamber reservoir etc Be sure 1 That any pressure in the chamber has been completely vented through the suction or discharge lines or other appropriate openings or connections 2 That the driving means motor turbine engine etc has been locked out or made non operational so that it cannot be started while work is being done on pump 3 That you know what liquid the pump has been handling and the precautions necessary to safely handle the liquid Obtain a material safety data sheet MSDS for the liquid to be sure these precautions are understood Failure to follow above listed precautionary measures may result in serious injury or death ROTATION Viking pumps operate equally well in a clockwise or counterclockwise rotation Shaft rotation determines which port is suction and which is discharge Port in area where pumping elements gear teeth come out of mesh is suction port PRESSURE RELIEF VALVES 1 Viking pumps are positive displacement pumps and must be provided with some sort of pressure protection This may be an inline pressure relief valve a torque limiting device or a rupture disk 2 If pump rotation is reversed during operation pressure protection must be provided on both sides of pump Jacketing of the brack
19. tions necessary to flat washers Item 50A and lock washers Item 50 onto safely handle the liquid Obtain a material safety data sheet MSDS for the liquid to be sure these precautions are understood studs Item 17 NOTE Tighten nuts on studs tight enough to compress seal gland gasket Tighten only enough to POU a a nana Me ae Oiee anda Failure to follow above listed precautionary 6 For KK and LS sizes place pair of half round rings in measures may result in serious injury or death groove on shaft For all sizes turn bearing housing assembly CW into bracket until flange on bearing housing is 1 2 from bracket Do not turn the bearing 4 housing into the bracket completely Mark head Item 40 and casing Item 31 before disassembly to insure proper reassembly 7 Place lockwasher and locknut on shaft see Figure 5 for orientation Tighten locknut per Table 1 and bend one Pump Size Torque ftis 50 70 70 98 100 130 40 178 Remove nuts from head for Q R sizes Sizes H LS remove capscrews Remove head from pump For N R and RS sizes use jackscrew holes in head if needed Proper size and length of jackscrews for pump size are shown in Figure 4 The use of a hoist to support head will facilitate its removal A lifting hook will provide adequate connection for hoisting head If a hoist is not available cribbing or blocking can be used to support head This will eliminate having to lift head into position when
20. to the pump is fully supported and correctly aligned with the pump e Pump rotation is correct for the desired direction of flow ISSUE A PAGE 2 OF 8 WARNING WARNING i gt WARNING WARNING PIP gt to pump and or other equipment INSTALL pressure gauges sensors next to the pump suction and discharge connections to monitor pressures USE extreme caution when lifting the pump Suitable lifting devices should be used when appropriate Lifting eyes installed on the pump must be used only to lift the pump not the pump with drive and or base plate If the pump is mounted on a base plate the base plate must be used for all lifting purposes If slings are used for lifting they must be safely and securely attached For weight of the pump alone which does not include the drive and or base plate refer to the Viking Pump product catalog AVOID contact with hot areas of the pump and or drive Certain operating conditions temperature control devices jackets heat tracing etc improper installation improper operation and improper maintenance can all cause high temperatures on the pump and or drive THE PUMP must be provided with pressure protection An in line pressure relief valve a torque limiting device or a rupture disk If pump rotation may be reversed during operation pressure protection must be provided on both sides of pump THE PUMP must be installed in a manner that allows safe access for routine main
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