EHKO VSCT Vertical Multistage Centrifugal Pump User Manual

VSCT
VERTICAL MULTISTAGE CENTRIFUGAL PUMP
Operation Manual

Read this manual carefully before install, start the pump

Applications and conditions

The pumps are non-self-priming vertical multistage centrifugal pumps. The features are high efficient, low noise, a little corrosive liquid resistan-ce, compact structure, good appearance, small volume, light weight, easy to service, good s.I performance, etc.

1. Applications
   • Pump. liquids: Low viscosity, neutral, non-explosive liquids, not containing solid particles or fibres. The liquid must not attack the pump materials chemically.• Boiler water supply and condensing system;
   • Water tr.tment, filtration system;
   • Food and beverage industries;
   • Pressure boostMg M high-rise buildings;
   • Farmland irrigation, nursery irrigation and golf court irrigation;
   • Indust, cleaning system;
   • Liquid conveying, circulation and boosting;
   • Hot and cool water;

2. 0peration conditions
   • Medium temperature: Normal temperature type -15t –Mt; Hot water type -15.0 —+ 105°C;
   • Flow: 0.4-180m3/h
   • Medium pH range: pH 5-9;
   • Maximum ambient tempemture: +40t ;
   • Maximum altitude: 1000 m;
   • Minimum Mlet pressure: Refer to the catalogue;
   Caution:When pumping liquids with a density anthor viscosity higher than that of water, use motors with correspondingly higer outputs, if required.

Definition of model

1. Rated 1,3,4,5,8.10,12.15,16,20
2. Rated Flow(m,h): 32,45,64,90,100,130,160

 Structure

•  The pump is mainly composed of motor, pump head, diffuser, impel- ler, cylinder, inlet & outlet chamber, pump shaft, mechanical seal and so on. Refer to FigI-1, 1-2, 1-3, 1-4.
• Key parts of the pump, diffuser, impeller, cylinder, shaft, are all made of stainless steel.
• Mechanical seal is a single face seal. Seal part is cemented carbides/ carbon. Support part of support diffuser is made of tungsten carbide.
• Normally, pipes are connected by round flanges. Different types of connections are also available on demand of customer.

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Installation and connection

1. Handing
   When lifting the entire pump with motor, follow these instructions:
   Pump with motor sizes 0.37-7.5kW:
   Lift the pump in the motor flange by means of straps or the like.
   Pump with motor sizes 11-75kW:
   Lift the pump by means of the motor eyebolts.

The pump should be sited in a well ventilated and frost-free position. The distance between pump-motor and other objects should be at least 150mm , in order to cool the motor by fan with enough air.

• To reduce the head loss of inlet as least as possible, the inlet pipe sh-all be as short as possible.

• Ensure the check valve is installed in pipe line system before the pu-mp installation. If pump is used for boiler water supply, a check valve must be installed in the piping between pump and boiler.

• Pump shall be installed in cement base or other similar base with suitable height. It can also be installed in fixed grounds or fixed brackets on wall. Pay attention not to let the weight of pipe system on pump to pre-vent pump from damage. Caution: When installation, motor is not allowed to be hung upside down.

• Arrow on the inlet and outlet chamber shows the direction of flow of liquid through the pump. Check whether the liquid can flow easily be-fore starting pump.

• Before pump installation, the inlet pipe line shall be cleaned. If there is impurities in the pipe, it is necessary to install a strainer at 0.5-Im in front of the pump inlet (particularly recommended for pump with flow less than 8m3/b).
  The air locks shall be avoided when installing the inlet pipe line. see Fig. 3

• If the outlet globe valve might be closed(or the flow is decreased to be zero), a bypass shall be installed in outlet pipeline to ensure adequate lu-bricating and cooling water to pass the pump.

Electrical connection

• The electrical connections should be carried out by an authorized el-ectrician.
• To make sure the motor is suitable for the power supply, cables of the motor must be connected to power supply according to the Fig. on the term-inal box and the motor nameplate.
• Motor shall be connected with a fast and effective motor starter, to e-nsure that the motor will not be damaged by lack of phase, unstable voltage or overload. The motor shall be earthed reliably. Caution: Before take apart the terminal box cover or dismantle pump, make sure that the power supply is switched off. Waning – Electrical connection and safety devices
• The pump units should be connected to the power supply by the ap-propriately rated power cables according to the motor ratings.
• The pump units should always be equipped with safety devices as required in the standards (EN 809 and/or EN 60204-1) as well as by the national rules of the country where the pump is used.
• Despite the rules of any country, the power supply to the pump unit must be equipped with at least following electrical safety devices with appropriate ratings: – Emergency switch – Circuit breaker (as a supply disconnecting (isolating) device as well as an overcurrent protective device) – Motor overload protection
• Before open the terminal box, please shut off the power supply to prevent from power shock.
• Before open the coupling guards, please stop pump firstly to prevent from hurts.
• When installing the pump, please fix the foundation bolts vertically to prevent from pump falls to hurt people.
• Please till grease to the pump when it req. For motor power is less than 5.5kW, it is free of filling grease. For motor power is equal or bigger than 5.5kW, please fill grease every 5000 mining hours.

Start-up, operation and maintenance

Caution: Read the label on the cylinder carefully before start-up.

1. Do not start the pump until it has been filled with water or liquid fully.
   • Fill water in pump in inverse pouring system. Close the pump outlet valve, release air vent screw on the pump head, and open the inlet valve slowly until stable water flows from the air vent s-crew. Then fasten the screw. Open the check valve completely in the inlet pipeline.
   • In open system, fill water in pump when liquid surface is lower than Put, Notice: A check valve shall be installed in the inlet pipe. Close the pump outlet valve, release air vent screw and fill the liquid in pump through the air vent screw hole until the pump and inlet pipe line are filled with water fully. Fasten the air vent screw again. Caution: Do not start the pump until it has been filled with liquid fully and air vented. Be careful the direction of the air vent screw hole. Make sure the flowing water will not hurt persons or pump or its parts. Especially, pr-event from hurting for the hot water application.

2. Check the rotary direction Switch on the power supply and view the rotary direction by viewing the motor fan. Arrow on the pump head indicates the correct direction of rota-tion. That is, from the motor end, pump shall run counter-clockwise.

3. Check before pump start-up
   • Check whether the foundation bolt is fasten.
   • Check whether pump is filled with water fully.
   • Check whether the voltage of power supply is correct.
   • Check whether it rums correctly.
   • To make sure all pipe lines are connected tightly and can supply w-ater normally.
   • The valves in the inlet pipe line are completely opened and the outlet valve shall be opened slowly after the pump is started up.
   • Check the operation pressure if pressure meter is installed.
   • Check all the controls for normal operation. If the pump is controlled by pressure switch, check and adjust the starting pressure and stopping pr- essure. Check the full load current to make sure it not surpasses the max. Current.

4. Frequency of pump starts Pump should not be started too frequently. It is suggested pump shall not be started more than 100 times per hour if the motor power is less or equal to 41cW. When motor power is big than 41cW, pump shall not be sta-
   rted more than 20 times in one hour. If pump starts and stops too freque-ntly, control device shall be checked and adjusted to make pump not start and stop too frequently. Also, it is necessary to check the installation.

5. Suggestion: When pump running, flow should be controlled at the range of 0.5-1.3 times of rated flow.

6. Pump which is installed according to this installation manual will work effectively and require a little maintenance.
   • Mechanical seal will be adjusted automatically, the moving part and stationary part is lubricated and cooled by the .nsfering liquid. When re- place the mechanical seal, the user needn’t to disassemble the motor for power bigger than 7.5kW.
   • The bearing in pump is lubricated by the .nsfering liquid.

7. Frost Protecting Pump can be used in the system with anti-frozen measures to water. If the pump is installed in easily frozen place, suitable antifreeze shall be added to the transfering liquid to prevent pump from being damaged. If antifreeze is not used, pump shall be stopped when it is frozen. Pumps which are not being used should be drained.

8. The following should be checked regularly for pump.
   • Pump working and operating pressure
   • Possible leakage
   • Possible motor overheat
   • Cleaning/replacement of all strainers
   • The switch off time of motor when overload
   • Frequency of starts and stops.
   • All control operation If malfunction is found, check system according to .Fault finding and solution chart.

9. Pump shall be cleaned and kept appropriately when it is not used for a long time.

10. Pump shall be prevented from being corrupted and damaged in storage.

Assemble and disassemble

1. Rated flow 1,2,3,4,5 m3/h
   • Put the circlip cover on the shaft, and then fit the sleeve, impeller, im- peller sleeve, diffuser, support diffuser. Continue the assemble order till the last impeller is fitted. Then fit the impeller cover, washer, screw the nut. Pay attention to the position of the support diffuser, for less stages pump, the last one is sup, diffuser. For more stages pump, sup, diffuser should be in-creased accordingly, the distance of each support diffuser should be even, a-nd put on the support sleeve and bearing with support diffuser.
   • Put the inducer on the inlet & outlet chamber, and then fit the finished parts as above on the inducer.
   • Fit the 0-ring on the inlet & outlet chamber, put on the cylinder and the top diffuser.
   • Put the pump head installed with 0-ring, lining and corrugated spring on the cylinder. Screw the four nuts of the stay bolts on the base plate. Do not tighten one nut completely at one time, but tighten them symmetrically in turn.
   • Fit the mechanical seal and tighten it , then install motor and coupling, screw the bolts in coupling(but not tightly),press the coupling and shaft d-own to the direction of the base plate. Then lift it about 1mm in reverse dir-ection, tighten the screws. Note that the space between the two couplings should be equal.
   • Tighten fixing bolts in mechanical seal, rotate the coupling to ensure that the shaft can rotate freely and not be choked. Reverse the process above can disassemble a pump.

2. Rated flow 8,10,12,15,16,20 m,
   • Put the circlip cover on the shaft, and then fit the sleeve, impeller, im- peller sleeve, diffuser, support diffuser, bearing, support sleeve. Continue the assemble order till the last impeller is fitted, and then install the impeller cover, washer, tighten the nuts.
   • Put the inlet & outlet chamber on the base plate, then put the 0-ring, clamp plate, inducer on inlet & outlet chamber, then put the finished parts on the inducer, and put the top diffuser on the top, tighten nuts of straps. At last put on the cylinder.
   • Put the pump head installed with 0-ring, lining and adjusting rubber on the cylinder, then tighten the four stay bolts symmetrically in tum.
   • Fit the mechanical seal and tighten it , then install motor and coupling, screw the bolts in coupling(but not tightly),press the coupling and shaft d-own to the direction of the base plate. Then lift it about 1mm in reverse di- rection, tighten the screws. Note that the space between the two couplings should be equal.
   • Tighten fixing bolts in mechanical seal, rotate the coupling to ensure that the shaft can rotate freely and not be choked. Reverse the process above can disassemble a pump.

3. Rated flow 32,45,64,90 m3/h
   • Put the inlet & outlet chamber on the base plate, fit flanges on inlet & outlet chamber at two sides, and fit the inducer.
   • Put the first impeller on the shaft, tighten the nuts and put the impeller on the neck ring base of inducer, then put on the diffuser, impeller, support diffuser, until the top diffuser, then fix all the diffuser with the straps.
   • shaft parts: fit the bottom sleeve, cover, washer on the shaft, tighten the bolts, fit bottom bearing on the inlet & outlet chamber, fit washer. Th-en put the shaft parts on the inlet & outlet chamber, fit on 0-ring, lubricate the 0 ring and then put on the cylinder.
   • Fit stay bolts on the base plate, then fit the 0-ring, adjusting rubber, air vent gag on the pump head, and put the pump head on the stay bolts, th-en put on the washer and tighten all the nuts.
   • Fit the mechanical seal on the pump head, then fit the seal cover, tig-hten the bolts, and the bolts in the seal. Lift the shaft and insert the adjusting slice.
   • Fit the bracket and motor on the pump head. Finally fit the coupling, tighten the bolts, and take out the adjusting slice. Rotate the coupling to ensure that the shaft can rotate freely and not be ch-oked. Reverse the above process to disassemble a pump.

4. Reted flow 100,130,160m3/h,
   • Put the inlet & outlet chamber on the base plate, fit flanges on inlet & outlet chamber at two sides, and fit the inducer.
   • Fit washer, shaft sleeve, inlet impeller sleeve, cover, washer, fasten the nut.
   • Fit impeller shaft sleeve, impeller, fasten impeller nut
   • Put the shaft parts on the inducer, fit support diffuser, impeller sleeve, impeller, fasten impeller nut, then, fit diffuser, impeller, etc. till the last di-ffuser.
   • Fit the top diffuser, use straps to fasten all diffusers. Fit 0-ring on the inlet and outlet chamber, lubricate them and put on cylinder.
   • Fit stay bolts on the base plate, fit 0 ring on the pump head, adjusting rubber, air vent screw, etc. Then put pump head on the stay bolts, fit washer, fasten nut.
   • Fit the mechanical seal on the pump head, then fit the seal cover, tig-hten the bolts, and tighten the bolts in the seal. Lift the shaft and insert the adjusting slice.
   • Fit the bracket and motor on the pump head. Finally fit the coupling, tighten the bolts, and take out the adjusting slice. Rotate the coupling to e-nsure that the shaft can rotate freely and not be choked and loose. Reverse the above process to disassemble a pump.

Fault finding and solution chart

Caution: Before removing the terminal box cover and before any rem- oval/dismantling of the pump, make sure that the power supply has been s-witched off.

M…,..es ..t,,
run w.I. steded| d)Main contacts of starter are not connected well or the coil is defective.| d) RePiace ….or starter.|
e) Control circuit is defective.| e) Check control circuit.
f) Motor is defective.| f)Repair.
| a) Fuses are blown.| a) Replace fuses.|
b) Contacts of overload| b)Check motor
°Yen…v..
of motor starter| device are faulty.| starter.| In the case of
trips out| c)Cable connection is loose or faulty.| c) Check cables and Pwer suPPIY| d) and ail
immediately
when, P?wer sup, y is| rsa’ssembleu .11. PurnP bY
d) Motor winding is , „ ,
aereenve.| d) Replace motor
switched on.| themselves.
e) Pump mechanically blocked.| e) Check and repair pump
| a)The setting of overload is too low.| a) Reset overload setting|
Overload device trips out| b) Periodic power supply| b) Check power|
occasionally.| faults.| supply|
c) Low voltage at peak times.| c)Add regulator.
| a) Contacts of sthrter are| a) Change motor|
Mo. starter h. not iliPPed out but the pump does not run.| not contacted well or the coil is faulty.| starter|
b) Contml circuit are defective| b)Check control circuit
Fault| Cause| Solution| Remarks
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| a) Suction pipe is too small.| a) Enlarge inlet pipeline|
| b) There is not sufficient| b)Improve system|
| water in pump water inlet.| and increase coming water|
Pumped water| c)Liquid level is low.| c) Try to lift liquid|
does not flow constantly| | level.|
d) Pump inlet pressure is| d) Improve system
|
too low compared with water temperature, pipeline loss and flow.| and try to increase
the inlet pressure.
|
| e) Suction pipe is partly| e) Check and clear|
| blocked by impurities.| impurities.|
| a) Suction pipe is blocked| a) Check and|
| by impurities.| clean suction pipe.|
| b) Foot valve or check| b)Check and|
Pump runs but
gives no water.| valve is closed.| repair foot valve or check valve.|
c)Leakage in suction pipe.| c) Check and repair suction pipe.
|
| d) There is air in suction pipe or pump.| d) Refill liquid, release air.|
| a) Leakage in suction pipe.| a) Check suction pipe|
| b) Foot valve or check| b)Check and|
| valve is defective.| repair foot valve or check valve.|
Pump runs backwards when|
c)Foot valve is blocked| c) Check and
switched off.| in opened or partly opened position.| repair foot valve.|
| d) There is air in suction| d) Check and|
| pipe.| repair suction pipe and release air.|
Abnormal vibration or
noise noise from pump| a) Leakage in suction pipe.| a) Check and repair suction pipe.| In the case of e), users shall not disassemble the pump by themselves.
b) Suction pipe is too small or suction pipe is partly blocked by impurities.| b)Enlarge or check suction pipe.
c)There is air in suction or pump.| c) Refill liquid to the pump and vent air.
d) The comparison of the delivery head of device with delivery head of pump is very low.| d) Improve system or choose another pump model.
e) Pump mechanically blocked.| e)Check and
repair pump.

 Important notice

1. Pump will be guaranteed for one year under normal operation with the correct model. Wearing part is not included.
2. Users shall be responsible for the damage if they disassemble the pumps by themselves in guaranteed period.
   Dear customer, we wish you enjoy using our high performance and reliable product ,thank you.

Documents / Resources

| EHKO VSCT Vertical Multistage Centrifugal Pump [pdf] User Manual
VSCT Vertical Multistage Centrifugal Pump, VSCT, Vertical Multistage Centrifugal Pump, Multistage Centrifugal Pump, Centrifugal Pump
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