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Xylem Bell & Gossett VSC Series, Instruction Manual

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Xylem Bell & Gossett VSC Series Instruction Manual Download Page 4

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PUMP IDENTIFICATION 

Bell & Gossett pumps are designated by a series 
of numbers such as Series VSX, Model VSH, 
VSC, or VSCS. The pump nameplate gives 
identification and rating information as shown in 
Figures 1 and 2. 

Permanent records for this pump are referenced 
by the serial number and it must be used with all 
correspondence and spare parts orders. 

Figure 1:  Rating Plate 

Figure 2:  Suction Limitation 

Summary of Contents for Bell & Gossett VSC Series

Page 1: ...INSTRUCTION MANUAL P5002169 REVISION E INSTALLER PLEASE LEAVE THIS MANUAL FOR THE OWNER S USE Series VSX VSH VSC and VSCS Models Centrifugal Pumps ...

Page 2: ...SHOOTING 22 GUARDS 24 ANSI OSHA COUPLING GUARD REMOVAL INSTALLATION 24 Removal 24 Installation 24 BRACKET GUARDS 25 SERVICE 26 GENERAL DISASSEMBLY PROCEDURES 27 SHUTDOWN 27 DISASSEMBLY PROCEDURE TO REMOVE BEARING FRAMES ALL PUMPS 27 DISASSEMBLY PROCEDURE TO REMOVE STANDARD MECHANICAL SEALS 28 DISASSEMBLY PROCEDURE TO REMOVE STUFFING BOX AND PACKING 29 DISASSEMBLY PROCEDURE TO REMOVE CARTRIDGE SEAL...

Page 3: ... Seal Sizes 4x6x10 5 5x6x10 5 5x6x13 5 6x8x10 5 6x8x13 5 8x10x10 5 175 psi 300 psi 2 5 Seal Sizes 8x10x13 5 10x12x10 5 10x12x13 5 175 psi 300 psi 3 Seal Sizes 12x14x13 5 14x16x13 5 160 psi 300 psi 3 5 Seal Sizes 12x14x17 5 125 psi 300 psi Maximum Working Pressure Listed on pump nameplate SEAL OPERATING LIMITS Mechanical Seals NOTE For use on closed or open systems that are relatively free of dirt ...

Page 4: ... Model VSH VSC or VSCS The pump nameplate gives identification and rating information as shown in Figures 1 and 2 Permanent records for this pump are referenced by the serial number and it must be used with all correspondence and spare parts orders Figure 1 Rating Plate Figure 2 Suction Limitation ...

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Page 6: ...mage Mechanical Safety WARNING Unexpected Startup Hazard Disconnect and lockout power before servicing Failure to follow these instructions could result in serious personal injury or death or property damage WARNING Rotating Components Hazard Do not operate the pump without all guards in place Failure to follow these instructions could result in serious personal injury or death or property damage ...

Page 7: ...n extended shutdown after the unit is in operation the following requirements for short term storage apply Store in a covered and dry location Store the unit free from excessive cold or heat below 32 F and above 110 F dirt and vibration Rotate the shaft by hand several times 10 15 turns at least every 30 days For initial storage longer than three months or for pump shut down after being in operati...

Page 8: ...s When the baseplate of the assembly is structural channel construction the pump and base plate should be set in place first The motor should then be separately lifted mounted to the unit Figure 4b Appropriate lifting device As an alternative to lifting by forklift lifting devices can be used to lift the complete pump motor assemblies When lifting the complete pump assembly Fig 4c securely place t...

Page 9: ... a steady flow of liquid This condition provides a positive suction head on the pump It may also be possible to prime the pump by pressurizing the suction vessel Important Do not install and operate Bell Gossett Pumps 3D Valves Suction Diffusers etc in closed systems unless the system is constructed with properly sized safety devices and control devices Such devices include the use of properly siz...

Page 10: ...pleted and after the pump is installed and bolted down align it again It may be necessary to re adjust the alignment from time to time while the unit and foundation are new Optional Grouting It is permissible to grout the base after the pump unit has been leveled securely bolted to the floor and properly aligned A good grade of non shrinking grout should be used inside the pump base Figure 7 Setti...

Page 11: ... be checked by using a caliper to gauge the distance between the two hubs at various points around the circumference Do not rotate the shafts Reposition the equipment until the difference between the minimum and maximum distance values is within the permissible value Angular misalignment may also be checked by inserting feeler gauges between the coupling faces at various points around the circumfe...

Page 12: ...dial to zero Rotate both coupling halves together making sure the index lines remain matched Reposition the equipment until the offset is within the permissible value Parallel misalignment may be checked by mounting the dial indicator base to one coupling half or shaft and positioning the dial indicator button on the outside diameter of the opposite coupling half Set the dial to zero Rotate both c...

Page 13: ...nt Replacement capscrews are to be purchased through your local Bell Gossett representative WARNING Flying Objects Hazard Capscrews with damaged or absent thread lock coating should be not be used Otherwise the required counterforce will not be achieved and hardware may become loose and dislodge from coupling assembly Failure to follow these instructions could result in serious personal injury or ...

Page 14: ...hangers or other supports at necessary intervals to provide support When expansion joints are used in the piping system they must be installed beyond the piping supports closest to the pump Tie bolts should be used with expansion joints to prevent pipe strain Do not install expansion joints next to the pump or in any way that would cause a strain on the pump resulting from system pressure changes ...

Page 15: ...mp Refer to the Hydraulic Institute Standards for inlet pipe sizing and velocity requirements Elbows in the suction piping for horizontal double suction pumps should be installed per the Hydraulics Institute Standards as there is always an uneven turbulent flow around an elbow When it is in a position other than the vertical in relation to the pump suction nozzle it causes more liquid to enter one...

Page 16: ...pe rather than the multiple spring type sized to avoid excessive friction in the suction line The foot valve and pipe should be sized to maximize NPSHa to the pump by minimizing suction line losses Check valves are placed in the discharge piping in normal applications Before using a check valve in the suction piping consider the added pressure drop to the pump potential water hammer and the chance...

Page 17: ...cking If the pump system pressure conditions vary during the day packing adjustment becomes difficult Consideration should be given to using a mechanical seal Standard pumps are normally packed before shipment If the pump is installed within 60 days after shipment the packing will be in good condition with a sufficient supply of lubrication If the pump is stored for a longer period it may be neces...

Page 18: ...nd then control the drippage by tightening the packing gland A combination of both adjustments is essential to arrive at the optimum condition The life of packing and sleeve depends on careful control more than any other factor VEE CUT IMPELLER TRIMS A vast majority of the impeller trims are standard straight cuts However on several pump sizes a vee cut is employed for the smaller diameters See Fi...

Page 19: ...1 Figure 18 Vee cut Impeller Diameters ...

Page 20: ...ne CAUTION Seal Damage Hazard Do not run pump dry Seal damage may occur Failure to follow these instructions could result in serious property damage and or moderate personal injury While venting the air from the pump body the pump shaft should be rotated a few times by hand PRE START CHECKS WARNING Unexpected Startup Hazard Disconnect and lockout power before servicing Failure to follow these inst...

Page 21: ...eld Venturi meters flow nozzles orifice plates or timing the draw down in the wet well are all possible methods Record any reading for future reference 3 Pressure Check and record both suction and discharge pressure gauge readings for future reference Also record voltage amperage per phase kilowatts if an indicating wattmeter is available and pump speed 4 Temperature Check and record bearing tempe...

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Page 24: ...tle pump and clean impeller Not Enough Liquid Delivered 8 Air leaks in suction piping Test flanges for leakage by plugging inlet and putting line under pressure A gauge will indicate a leak with a drop of pressure 9 Speed too low See item 5 10 Discharge head too high Check pipe friction losses Large piping may correct condition Check that valves are fully open 11 Suction lift too high See item 3 1...

Page 25: ...e advised by factory 31 Cavitation See item 13 32 Mechanical defects See items 14 and 15 33 Liquid heavier in either viscosity or specific gravity than allowed for Use larger driver Consult factory for recommended size Test liquid for viscosity and specific gravity 34 Wrong direction of rotation See item 15 35 Casing distorted by excessive strains from suction or discharge piping Check alignment E...

Page 26: ...pscrews and hardware that fasten the guards to the guard support 5 On units supplied with spacer couplings a second guard support is supplied underneath the inner guard If present remove the two capscrews and hardware fastened to the second guard support 6 Remove the capscrews and hardware that hold the guard support s to the base rail Remove the guard support s and bottom guard halves Installatio...

Page 27: ...ed Failure to follow these instructions could result in serious personal injury or death or property damage Guarding is also provided to give protection for the exposed shaft length between the seal gland stuff box and the bearing housing See Figure 21 Three guards are provided for each bracket two for the side windows and one for the top window Figure 21 Bracket Guard Installed on Inboard Bearing...

Page 28: ...26 SERVICE Figure 22 Mechanical View ...

Page 29: ...m of the pump housing Do not reinstall the plug or close the drain valve until reassembly is completed Failure to follow these instructions could result in moderate personal injury or property damage DISASSEMBLY PROCEDURE TO REMOVE BEARING FRAMES ALL PUMPS 1 Remove the coupling guard See the Guards section 2 Remove the capscrews that secure the coupling element to the hubs Remove the coupling elem...

Page 30: ...ing bracket DISASSEMBLY PROCEDURE TO REMOVE STANDARD MECHANICAL SEALS 1 Loosen the set screws in the sleeve 2 Remove the four gland assembly capscrews 3 Remove the gland assembly and the sleeve from the shaft See Figure 28 The use of a bearing puller attached to the step in the sleeve may be required Figure 28 Removing the Gland Assembly and Sleeve 4 Remove the gland gasket 5 While pushing down on...

Page 31: ...ing box gasket 7 Remove the quad ring from the shaft 8 Repeat steps 1 through 7 for the other side 9 If only the packing rings and sleeve are to be replaced proceed to the section entitled Assembly Procedure to Install Stuffing Box and Packing If disassembly of the pump is required proceed to the section entitled Disassembly Procedure to Remove Coverplates and Shaft Assembly All Pumps DISASSEMBLY ...

Page 32: ... AND SHAFT ASSEMBLY ALL PUMPS 1 Ensure shaft threads are protected using tape or nuts See Figure 34 2 Remove the volute capscrews Using jacking screws pull the coverplate from the volute See Figure 34 Figure 34 Removing the Coverplate Using Jacking Screws 3 Remove the volute gasket 4 Pull the impeller and shaft assembly from the volute See Figure 35 Figure 35 Removing the Shaft Assembly 5 Repeat s...

Page 33: ...the quad ring grooves See Figure 37 Figure 37 Installing the Quad Rings 6 Slide the volute gasket onto the coverplate See Figure 38 Grease may be used to hold the gasket in place 3 P 80 is a registered trademark of International Products Corp Figure 38 Installing the Gasket on the Coverplate 7 Using guide pins threaded rod or a headless bolt threaded into the volute install coverplate One coverpla...

Page 34: ...ion soapy water or equivalent NOTE Handle the seals with care Clean the glands and seals before assembly Take care not to damage the seals during assembly Figure 43 The Seal Seat Installed in the Gland 2 Slide the gland assembly over the shaft sleeve 3 Lightly lubricate the shaft sleeve with P 80 Rubber Lubricant Emulsion soapy water or equivalent and slide the mechanical seal head onto the sleeve...

Page 35: ...asket in place 5 Slide the sleeve stuffing box subassembly over the shaft until the sleeve bottoms out onto the shaft locating shoulder 6 Install the four stuffing box capscrews 7 Install set screws in the sleeve and tighten to 50 inch lbs NOTE The last ring in each box may not be required until after the pump has operated for a period of time 8 Assemble the glands studs washers and nuts square wi...

Page 36: ... backup ring onto the shaft See Figure 49 See Figure 22 for a listing of pump sizes with 2 frames Figure 49 Installing the Bearing Backup Ring 2 Frame Pumps Only 3 Heat the bearing using an induction heater CAUTION Bearing Damage Do not exceed a temperature of 275 F when heating the bearing Damage to the bearing components may result if 275 F is exceeded Failure to follow these instructions could ...

Page 37: ...3 5 ...

Page 38: ...age 1 Remove the pump from the base 2 Follow the Disassembly Procedures applicable to the pump NOTE Only one of the coverplates must be removed to change rotation 3 Press the press fitted impeller off the shaft Observe the direction in which the vane tips are pointing Turn the impeller end for end 180 and press it back onto the shaft Refer to the section entitled Assembly Procedure to Install Cove...

Page 39: ...wearing parts The recommended inventory of spare parts depends upon the installation and the importance of continued operation For normal service with repairs to be made in the field the following parts are recommended for stock 1 set of bearings 1 set of wearing rings if required 1 set of casing gaskets quad rings and lip seals 2 mechanical seals complete Parts should be ordered as far in advance...

Page 40: ...crew Diameter Capscrew Type Head Marking 1 4 5 16 3 8 7 16 1 2 5 8 3 4 7 8 1 SAE Grade 2 6 13 25 38 60 120 190 210 300 Brass Stainless Steel or 4 10 17 27 42 83 130 200 300 SAE Grade 5 10 20 35 60 90 180 325 525 800 SAE Grade 8 13 28 46 75 115 225 370 590 895 ...

Page 41: ... or replaced under the Warranty are warranted only for the balance of the warranty period on the parts that were repaired or replaced Seller shall have no warranty obligations to Buyer with re spect to any product or parts of a product that have been a repaired by third parties other than Seller or without Seller s written approval b subject to misuse misapplication neglect alteration accident or ...

Page 42: ... without Seller s written approval b subject to misuse misapplication neglect alteration accident or physical damage c used in a manner contrary to Seller s instructions for installation operation and maintenance d damaged from ordinary wear and tear corrosion or chemical attack e damaged due to abnormal conditions vibration failure to properly prime or operation without flow f damaged due to a de...

Page 43: ...NOTES ...

Page 44: ...is used conserved and re used in the future is central to our work Our products and services move treat analyze monitor and return water to the environment in public utility industrial residential and commercial building services settings Xylem also provides a leading portfolio of smart metering network technologies and advanced analytics solutions for water electric and gas utilities In more than...

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