ITT Goulds Pumps 3755 Installation, Operation And Maintenance Manual Download Page 28 | Manualshive

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6.7 Pump is noisy or vibrates

1.

Hydraulic noise - cavitation, suction lift too high. Check with vacuum or compound gauge.

2.

Mechanical defects:

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Shaft bent

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Rotating parts bind, are loose or broken

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Bearings worn out

•

Pump and driving unit misaligned.

6.7 Pump is noisy or vibrates

26

Model 3755 Installation, Operation, and Maintenance Manual

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Summary of Contents for Goulds Pumps 3755

Page 1: ...Installation Operation and Maintenance Manual Model 3755 ...

Page 2: ......

Page 3: ...ator packed box 19 3 5 Connection to quenching gland 19 3 6 Connection of cooling water piping 19 3 7 Connection of drain piping 20 4 Starting Pump 21 4 1 Priming 21 4 2 Adjustment of stuffing box gland 21 4 3 Alignment final 21 4 4 Doweling 21 5 Operation 22 5 1 Stuffing box 22 5 2 Operating at reduced capacities 22 5 3 Operating at reduced head 23 5 4 Operating with surge conditions in line 23 5...

Page 4: ...4 Sectional views parts list and interchangeability tables 29 7 5 Wearing rings 31 7 6 Replacing impeller 32 7 7 Replacing shaft or bearings 33 7 8 Replacing casing 36 7 9 Spare parts 36 7 10 Instructions for ordering spare parts 37 Table of Contents 2 Model 3755 Installation Operation and Maintenance Manual ...

Page 5: ...com en US Tools and Resources Litera ture or by contacting your nearest Goulds Pumps sales representative These manuals must be read and understood before installation and start up For additional information contact your nearest Goulds Pumps sales representative or visit our Web site at https www gouldspumps com 1 2 Safety warnings Specific to pumping equipment significant risks bear reinforcement...

Page 6: ...ates a hazardous situation which if not avoided could result in death or serious injury Example Pump shall never be operated without coupling guard installed correctly CAUTION Indicates a hazardous situation which if not avoided could result in minor or moderate injury Example Throttling flow from the suction side may cause cavitation and pump damage Electrical Hazard WARNING Indicates the possibi...

Page 7: ...NING NEVER run pump below recommended minimum flow when dry or without prime WARNING ALWAYS lock out power to the driver before performing pump maintenance WARNING NEVER operate pump without safety devices installed WARNING NEVER operate pump with discharge valve closed WARNING NEVER operate pump with suction valve closed WARNING DO NOT change service application without approval of an authorized ...

Page 8: ...ers of the proper size and material WARNING Replace all corroded fasteners WARNING Ensure all fasteners are properly tightened and there are no missing fasten ers WARNING Startup and Operation When installing in a potentially explosive environment please ensure that the motor is properly certified WARNING Operating pump in reverse rotation may result in contact of metal parts heat generation and b...

Page 9: ...void physical injury and or equipment damage Steel toed shoes must be worn at all times WARNING The pump may handle hazardous and or toxic fluids Observe proper decon tamination procedures Proper personal protective equipment should be worn Precautions must be taken to prevent physical injury Pumpage must be han dled and disposed of in conformance with applicable environmental regula tions WARNING...

Page 10: ...lectrical equipment installed in Europe ATEX deals with the control of potentially explosive atmospheres and the standards of equipment and protective systems used within these atmospheres The relevance of the ATEX re quirements is not limited to Europe You can apply these guidelines to equipment installed in any poten tially explosive atmosphere Guidelines for compliance Compliance is fulfilled o...

Page 11: ...the specified area where the equipment will be installed If it is not do not operate the equipment and contact your ITT Goulds Pumps sales representative before proceeding The code classification marked on the equipment must be in accordance with the specified area where the equipment will be installed If it is not do not operate the equipment and contact your ITT Goulds Pumps sales representative...

Page 12: ...e foundation bolts should be of sufficient length so that they project through the nut approxi mately after allowance has been made for grouting to 1 the thickness of the bed plate and the thickness of the foundation bolt nut See Figure 2 Foundation on page 10 Figure 2 Foundation 3 Preparing Foundation for Mounting Prior to setting unit upon the foundation clean the top surface of concrete 4 Mount...

Page 13: ...rden at least 48 hours 2 3 Alignment initial Alignment of the pump and driver through the flexible coupling is of extreme importance for trouble free mechanical operation If the driver was mounted at the factory the unit was in alignment before it left our assembly department However in transit and subsequent handling this factory alignment was probably destroyed and it is now necessary to reestab...

Page 14: ...r as required Tighten driver hold down bolts after adjustments are made Figure 4 Checking angular alignment except spider insert type 2 Spider insert type coupling The normal gap distance of the space between coupling halves and the thickness of the spider insert is 1 16 Check angular misalignment by using calipers at four points on the circumference of the outer ends of the coupling hubs at 90 de...

Page 15: ... secure vertical parallel alignment under actual operating conditions the driver shaft must be set higher or lower than the pump shaft to compensate for vertical expansion A sug gested approximate cold setting for motor driven pumps is outlined below 1 When pumping cold liquids or when pump bearings are being cooled set the motor shaft 006 below the pump shaft 2 When pumping hot liquids 150º to 18...

Page 16: ...neral properly installed suction piping is of extreme importance for trouble free centrifugal pump operation a The suction pipe should be as large or larger than the pump suction b lncreasers if used should be eccentric and preferably at the pump suction flange sloping side down c A centrifugal pump should never be throttled on the suction side for capacity adjustment 2 Installations With Pump Abo...

Page 17: ... be located between the gate valve and pump to permit inspection of the check valve The gate valve is required for priming regulation of flow capacity and for inspection and maintenance of the pump 2 lncreasers if used in discharge line should be placed between the check valve and the pump 2 6 Piping discharge Model 3755 Installation Operation and Maintenance Manual 15 ...

Page 18: ...e pump casing Make sure that the driver rotates in the same direction On elec tric motors jog starting switch with coupling disconnected to be sure wiring is connected for correct rota tion If the pump is run dry the rotating parts within the pump may gall and seize to the stationary parts as they depend on the liquid being pumped for lubrication 2 9 Connection of coupling Connect coupling followi...

Page 19: ...etween 50 and 180 F In this range an oil of 300 SSU vis cosity at 100 F approximately SAE 20 should be used If oil temperature exceeds 180 F for extended periods use of cooling water in the frame cooling jacket is recommended For extreme conditions refer to factory or a lubrication expert for a recommendation The constant level oiler 251 is found in the box of fittings shipped with the pump Oiler ...

Page 20: ...ing the joints The lantern ring should then be inserted in the stuffing box When it is in its proper posi tion it will be directly opposite the sealing inlet connection After the lantern ring is in place insert two more rings of packing on Group S and M and three more on Group L staggering the joints One extra ring is furnished in each set of packing The extra ring should be added as required Plac...

Page 21: ... lift or if suction source is under vacuum Refer to 7 4 Sectional views parts list and interchangeability tables on page 29 for list of pumps with two wearing rings Under these conditions the packing will not be cooled and lubricated and the air will be drawn into the pump Sealing liquid may be supplied by circulating pumpage to the lantern ring through a line from casing to the pipe tap seal conn...

Page 22: ... be plugged The cooling liquid must be supplied from an outside source and a shut off valve should be installed in the supply line to regulate the flow of the cooling liquid 3 7 Connection of drain piping Connect the pipe tap openings from the drip pockets directly below the stuffing box to drain On pumps equipped with a drip basin 247 connect to the tapped opening on the end of the drip basin pip...

Page 23: ...ntion and careful adjustments are necessa ry See Stuffing box for final adjustments of gland 4 3 Alignment final Final alignment can only be accomplished after unit has been run under actual operating conditions for a sufficient length of time to bring the unit up to operating temperatures After this warm up period has elapsed stop the unit and immediately and check the coupling alignment Follow t...

Page 24: ...apacities or with discharge gate valve closed be cause the energy required to drive the pump is converted into heat If this condition exists over a long period the temperature of the liquid in the pump may increase until the boiling point is reached If this occurs the rotating parts are exposed to vapor with no lubrication and they may score or even seize to the stationary parts and furthermore if...

Page 25: ... safe point 5 4 Operating with surge conditions in line If pump is installed with a quick closing valve in discharge line that closes when pump is running danger ous pressure surges may be built up that can cause damage to the pump or line In services of this kind some cushioning arrangement must be provided to protect the pumping equipment 5 5 Operating under freezing conditions When exposed to f...

Page 26: ...Pump not primed casing and suction pipe not completely filled with liquid 2 Speed too low 3 Discharge head higher than anticipated Check system head particularly friction loss 4 Suction lift too high suction pipe may be too small or long causing excessive friction loss Check with vacuum or compound gauge 5 Impeller or suction pipe or opening partially plugged 6 Wrong direction of rotation or impel...

Page 27: ...uction lift too high suction pipe may be too small or long causing excessive friction loss Check with vacuum or compound gauge 7 Impeller plugged 6 5 Pump takes too much power 1 Speed too high 2 Head lower than rating pumps too much liquid 3 Liquid heavier than anticipated Check viscosity and specific gravity When directly connected to electric motors check whether motor wiring is correct and rece...

Page 28: ...on lift too high Check with vacuum or compound gauge 2 Mechanical defects Shaft bent Rotating parts bind are loose or broken Bearings worn out Pump and driving unit misaligned 6 7 Pump is noisy or vibrates 26 Model 3755 Installation Operation and Maintenance Manual ...

Page 29: ...ected in 3 1 Pump bearings on page 17 7 2 Repacking stuffing box 1 Loosen gland nuts and slide gland along shaft out of stuffing box Remove gland halves from pump 2 Remove the outer rings of packing with the aid of a packing hook 3 Remove lantern ring 105 by inserting a wire hook in the slots in the outer edge of the ring and pulling ring from box 4 Remove the three inner rings of packing with the...

Page 30: ...yway and shaft keyway are in alignment 13 Fasten deflector 123 to shaft sleeve 126 by tightening set screw being sure that point of set screw enters hole in shaft 14 Slide lantern ring along shaft sleeve and wire temporarily to deflector 123 15 Replace casing 100 and bolts 370B 16 Replace impeller key 178 in shaft being sure that key enters keyway in sleeve 17 Slide impeller on shaft as far as pos...

Page 31: ...ng wearing rings 2x2 7 3x3 5 1 1 2x2 9 2x2 1 2 9 2 1 2x3 9 2x3 7 3x4 7 4x5 7 5x5 7 6x6 9 2 1 2x3 11 3x4 11 4x6 11H 8x8 11 2 1 2x3 13 3x4 13 4x6 13 4x6 13L 6x8 13 7 4 Sectional views parts list and interchangeability tables Model 3755 Installation Operation and Maintenance Manual 29 ...

Page 32: ...only 1 1 4x1 1 2 5 1 1 4x1 1 2 7 1 1 4x1 1 2 8 1 1 2x2 5 2 1 2x2 1 2 6 4x4 7 Oil lubricated bearing construction 7 4 Sectional views parts list and interchangeability tables 30 Model 3755 Installation Operation and Maintenance Manual ...

Page 33: ...ded for both hubs of the impeller on some sizes and only on the suction hub on others Refer to section vi d These rings allow a small clearance to be maintained between the 7 5 Wearing rings Model 3755 Installation Operation and Maintenance Manual 31 ...

Page 34: ... Puller must push against shaft as shown Do not use a type that pulls from casing All impellers are provided with two tapped holes to facilitate use of puller 6 Check diameters of both hubs and rings If clearances are excessive the rings should be re placed See recommended clearances table above 7 Remove rings from cover and casing 8 Clean bore in which rings seat and press new rings evenly into p...

Page 35: ...o remove ball bearing coupling end 112 proceed as follows Using suitable pliers remove the bearing housing retaining ring 361A which is seated in the housing and shoulders against the outer race of the bearing The housing can now be slipped over the bearings Remove the shaft retaining ring 361 which is seated in the shaft and retains the inner race of the bearing With the use of a suitable bearing...

Page 36: ... end of the pipe until the bearing is seated firmly against the shaft shoulder Insert the retaining ring 361 in the shaft groove Carefully slide the bearing housing 111 over the shaft and bearing as far as possible Insert the retaining ring 361A in the groove in the bearing housing All retaining ring grooves must be clean and the re taining rings must be properly seated Note that the flat sides of...

Page 37: ...place pump half coupling on shaft screw a diameter std approximately 1 longer than the length of the coupling hub on Group S pumps a 5 8 diameter stud approximately 1 lon ger than the length of the coupling hub on Group M and L pumps into the end of the shaft Insert the coupling key in shaft Put oil or white lead on the shaft and in the coupling bore Place the complete pump half coupling in positi...

Page 38: ...e of a suitable puller similar to that shown if Figure 10 Impeller puller on page 28 pull im peller from shaft Puller must push against shaft as shown Do not use a type that pulls from casing All impellers are provided with two tapped holes to facilitate use of puller 6 Remove stuffing box gland 107 7 Unscrew hex head machine bolts 370B and remove casing from frame 8 Remove old packing and lantern...

Page 39: ...04 one required 8 Impeller washer 199 one required 9 Shaft sleeve 126 one required 2 For each size pump it is suggested that one set of wearing rings be maintained 7 10 Instructions for ordering spare parts Repair orders will be handled with the minimum of delay if the following directions are followed 1 Give Model No size of the pump and serial number These can all be obtained from the name plate...

Page 40: ... more information http www gouldspumps com Goulds Pumps Inc 240 Fall Street Seneca Falls NY 13148 USA 2021 ITT Corporation The original instruction is in English All non English instructions are translations of the original instruction Form IOM 3755 en US 2021 09 ...

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