Faqs

1.      Pump is not primed. The water pump pouring through the primer button, the exhaust button must be opened until the water in the pump overflows of the primer.
2.     The pump runs in the opposite direction to the design.
3.     The valve is closed, or blocked in the suction or discharge hose. Check the flange gasket that must be cut through in its center.
4.     The mouth of the straw is not submerged in the suction tank. You can increase the length of the suction pipe or increase the water surface.
5.     Foot valve is closed or clogged.
6.     Filter grid clogged
7.     Suction pressure too low.
8.    Suction brach valve is open
9.     Suction pipe is not tight
10.  The system operates under negative pressure. Sleeve seals are permitting air to enter the system. You should change the sealing type by mechanical seals.
11.   The pump was worn out. Allowable clearance has been increased excessively.
12.   There are broken parts. Check pump shaft, coupling, internal components.
13.   No electric supplying

  1. The water has been exhausted. Check the suction tank water level; Occasionally the float is clogged, and the water indicator is incorrect.
  2. The flow rate is suddenly reduced.
  3. cavitation phenomenon.
  4. Branched suction pipes are heating up the pump fluid.
  5. A gas leak is growing in the suction line.
  1. The degree of the parts in the pump is large. It’s time to replace the widget.
  2. The suction pressure is too low; Air bubbles in the pump suction.
  3. Filters have been partially blocked.
  4. Operation speed is too low. Check Voltmeter.
  5. The exhaust button for the suction tank has been locked.
  6. Branch valve on suction opening or partially open.
  7. Alternate valves are closed but open.
  8. The suction pipe was broken, leaking. There are heavy objects that have gone through, stepped over.
  9. Smoking pipes are punctured; broken due to erosion.
  10. The air enters through the sealing. You should replace it with a seal.
  1. The speed of operation is too large.
  2. Viscosity of the solution is too large compared to the expected.
  3. The exploitation pressure is too large
  4. Sealing seals are too tight. You should change to a closed seal.
  1. Alternately valve bump into each other.
  2. Bolts, anchor bolts are loose.
  3. Pump and motor are out of balance.
  4. Suction piping is not tightened properly.
  5. The viscosity of the liquid is too large. Pump is “hungry”. Check the temperature of the pump water.

 

  1. Foot valve or any valve on the suction line is jammed.
  2. Something occasionally clogs the suction pipe. If the pump suction from the river; collection tank or from the sea, sand is one of the possible causes.
  3. Waste is swept into the pump chamber is a common cause.
  4. The pipe is broken.
  5. The filter is constantly blocked.
  6. The pool is frozen when the weather is cold.
  7. Sunlight heats the suction, increasing the temperature of the fluid to the point of evaporation.
  8. The water surface in the tank decreases causing a whirlpool phenomenon, when the air enters the suction chamber.
  9. Many pumps are operating in the same suction tank, reducing the water level very quickly.
  10. The float is broken
  11. In the circulating pump system, the discharge tube is connected directly to the suction pipe, or openings and the fluid temperature increases.
  12. Sometimes the depth is too deep. Friction of the suction pipe will reduce the suction capacity of the pump.
  13. The suction tank is heated to prevent freezing. Sometimes it overheats.
  14. The density of fluids is changed. This can happen with pump fluids having a temperature or detergent or anticoagulant activated in the pipeline.
  15. The discharge tank is changed from positive to negative pressure according to the production line.
  16. A connecting valve on the intake manifold has negative pressure and the gas can pass through the sealing gaskets.
  17. The water tank is being pumped out
  18. The mouth of the suction pipe is being shifted or changed in different ways
  19. Drainage in the pipeline reduces the suction capacity of the pump?

 

  1. There are corrosive substances in the fluid, the pump is corroded. You should use a bigger pump and run at a lower speed.
  2. worn out in one or more parts of the pump.
  3. Lack of lubrication for pumps.
  4. The piping system is in trouble. It can increase the flow temperature in the system.
  5. Too much balance.
  6. The pump runs dry
  7. Except for the above errors, it is best to reduce the NPSH required to use larger pumps and run at lower speeds.

Guide

1. Pump protection devices such as dry-running protection devices, fuses, Y Strainer, over-pressure relief valves must be installed.
2. Pressure gauge, flow meters for pump control
3. Pump flow must be set according to flow direction
4. Power supply to the pump must be stable (3 phase, 380v, 50Hz or 1 phase, 220v, 50Hz), ground must be connected to the motor, the cab must meet the standard, suitable capacity of motor
5. Rotation of the pump motor, indicated on the pump body.
6. Insert the inlet and outlet pipes according to the standard of the pump, clean the pipe before connecting to the pump
7. Do not operate the metering pump when no load is available, or the discharge port is closed
8. The piping system must initially adjust the pump flow and the low pressure and then lift the air from the piping system
9. Flexible hose couplings must be fitted at suction port and discharge port of pump

A. NOTIFICATIONS:
1. Always fill up liquid (water …) in the pumping chamber to prevent dry running of the pump shaft.

2. Connect the pump to a stable voltage source (3 phase, 380V, 50Hz or 1 phase 220V, 50Hz depending on pump).
Check the direction of rotation of the pump in the direction of the arrow attached to the pump body (in the direction of the clock).
3. Properly piping the pipe, ensuring optimum suction height and pressure, correct size of the pump. Check the coupling to keep the pump shaft and the motor to be centered
4. There are pump protection devices such as pressure gauge, dipole valve, bottom valve, waste filter, overload protection relay,
5. The valve must be opened at the discharge before pumping, then necessary adjustment to the pump working point. When starting the pump must close the discharge valve completely, check the pressure of the pump, to vent the pump head must remove the pump head bolts.

B. PRESERVATION AND USAGE OF PUMPS:
1. If the pump has not been used for a long time, check it, clean it with clean water (note motor at cleaning without splashing water) and apply anti rusting oil in joints and wings pump
2. Make sure the bolts are firmly fixed such as flanges, couplings, pump feet, pump frames, motors, piping, and mounting brackets. The pump must be flat
3. Placed in a horizontal position so that the pump is well operated, shielded, well protected, suitable environmental temperature
4. The diameter of the water hose shall not be less than that in the intake throat (greater than 1 level according to the pump standard), after the water has been pumped to check the pump operation.
5. Use water hose with not too soft material. Foot valves should be placed about 30 cm from the bottom to avoid sucking and sludge in the tank and filtering rubbish around the valve. If the pump suction is filled with impurities are not.
6. Pay attention to the water level, in case the bottom valve is above the water level of the tank

A. NOTIFICATION:

1. Do not use compressed air that include wet or watery. Piping include suction, discharge, compressed air tube, body bolts must be checked.
2. When installing the new pump, pump must be tested by fresh water
3. Carefully check the lubricant and lubricant levels in the compressed air (SAE # 10), the self-lubricating type is not needed.
4. Check the compressed air pressure to match the capacity, design of each pump
5. Install pump protection equipment such as check-valve, air pressure regulator, filter, lubrication, suction valve, exhaust valve, air damper.
6. Flexible joint needs to install at pump inlet & outlet to reduce the vibration.

B. PRESERVATION AND USAGE OF PUMPS:

1. If the pump is not used for a long time, check, clean it with clean water
2. Make sure the bolts are firmly fixed such as flanges, couplings, pump feet, pump frames, motors, piping, and mounting brackets.
3.Pump has to be placed in the proper position, shielded, well protected, suitable environmental temperature and do not to direct the sunlight
4. Suction pipe diameter has to be bigger than suction port
5. Open the outlet valve before starting the pump, then adjust the required gas pressure to the desired flow rate. If the outlet valve is fully closed, the pump will stop automatically.
6. Suction pipe is not too soft
7. Do not adjust and run the pump with high pressure exceeding the design standards will cause the pump to malfunction
8. When stopping the pump the inlet, outlet valves and the pneumatic valve must be locked then the pump should be clean after working with fresh water.
9. Compliance with labor protection (protective clothing, safety glasses) when installing, inspecting and running the test
10. Do not allow the pump to run dry for long periods of time will damage the gas distribution, sealing mechanism, shaft and valve seat.

A. NOTIFICATIONS:
1. Make sure to fill in the pump, install dry running protection, overheat the pump stator, overheat protection for the motor …
2. Overload protection device for pump, or install by pass line, overpressure safety valve installation

3. Electrical enclosures have protection devices such as thermal relays, fuses and stable supply voltage (380V, 3 phases, frequency 50Hz). Grounding wire for motor protection when leakage, electric wire must meet the standard, suitable for the motor capacity
4. The rotary direction of the screw pump can be run two-way depending on how the power to the motor and the machine
5. Install the inlet and outlet pipes according to the standards of the pump, soft coupling, anti-vibration for the pump, restrict the intake air, pump body,
6. Do not operate the screw pump when no fluid flow, or the discharge port is closed
7. When removing and installing the coupling, pump seals must follow the instruction book for each type of joint, pump type
8. The diameter of the fluid hose should not be less than the suction throat of the pump, greater than 1 level
9. For solid particles larger than the allowable diameter of each pump, the Y filter must be fitted

B. PRESERVATION AND USAGE OF PUMPS:
10. If the pump is not used for a long time, check, clean it with clean water
11. Make sure the bolts are firmly fixed such as flanges, couplings, pump feet, pump frames, motors, piping, and mounting brackets.
12.Pump has to be placed in the proper position, shielded, well protected, suitable environmental temperature and do not to direct the sunlight
13. Install suction and discharge valves on the pump
14. Periodically change the lubricant for the gearbox according to the instructions
15. Note that, only people that is acknowledgement allowed to check, maintenance, assembly pump. But still follow the instructions.
16. After use, the pump must be cleaned in the condition of the machine off and break off the power supply
17. When removing stator must carefully guard the rotor of the pump to prevent rotor fall
18. Compliance with labor protection (protective clothing, safety glasses, gloves) when installing, inspecting, testing

Previously, centrifugal pumps were only used in daily activities with relatively small application range. So far, centrifugal pumps have been widely used in large projects or industrial tourism sites. With the application of technology and production lines, companies supply centrifugal pumps with good durability and quality. However, during use, the centrifugal pump may have crashed, or do not know how to use it in a number of features, which will inevitably cause many bugs and unforeseen problems.

• Why do pumps often overload, or sometimes overload?

The basic reason for the overload of the pump is that it is too large, the pressure is greater than the calculated or viscosity is much higher than expected … In this case it is the pump running make loud noise, vibrate strong. The cause is similar to the above phenomenon, however, the pump vibration can be due to the connection from the pump to the motor is not balanced or some valves friction too many times. A common phenomenon that causes the pump to vibrate, shake so strong that it is caused by air bubbles.

  • Why is the motor still running but the centrifugal pump does not discharge?

The first cause of this phenomenon is due to the primer.

The second cause, the mouth of the suction tube has not reached the suction tank. To avoid this phenomenon, users note the length of suction or water tank level.

The third reason is that compared to the design or detailed instructions attached, the pump is running in the opposite direction.

The fourth reason is that there are obstructions or barriers on the bottom that trap the bottom or the screen is too full

In addition, users should note the gas leak or negative pressure system.

Some other important reasons that many people notice little is that the pump has worn out or some parts of the machine have been ruptured or worn out. Users should check the outboard and pump parts, couplings or main shaft. Prior to pump operation, the user should pay particular attention to the power supply to the pump.

A.    NOTIFICATIONS FOR DOSING PUMP :

1. Pump protection devices such as dry-running protection devices, fuses, Y Strainer, over-pressure relief valves must be installed.

2. Pressure gauge, flow meters for pump control

3. Pump flow must be set according to flow direction

4. Power supply to the pump must be stable (3 phase, 380v, 50Hz or 1 phase, 220v, 50Hz), ground must be connected to the motor, the cab must meet the standard, suitable capacity of motor

5. Rotation of the pump motor, indicated on the pump body.

6. Insert the inlet and outlet pipes according to the standard of the pump, clean the pipe before connecting to the pump

7. Do not operate the metering pump when no load is available, or the discharge port is closed

8. The piping system must initially adjust the pump flow and the low pressure and then lift the air from the piping system

9. Flexible hose couplings must be fitted at suction port and discharge port of pump

B. PRESERVATION AND USAGE OF PUMPS:

1. If the pump is not used for a long time, check, clean it with clean water

2. Ensure fixed, robust bolts, flanges, pistons, and piping are tightened.

3. Placed in the proper position so that the pumps are well operated, shielded, well protected, and environmentally appropriate. Not to direct sunlight

4. The diameter of the fluid hose must not be less than the suction throat of the pump

5. Periodically replace the lubricant for the pump according to the standard of the manual, lubricant to replace the type required by the supplier and sufficient

6. After using the pump must be cleaned in the condition of the machine and break off the power

7. When checking the maintenance of the pump, disconnect the power supply, discharge the pressure in the pipeline, and discharge all the fluid in the pump

8. Periodic inspection and pump maintenance when abnormal phenomena such as chemical leakage … Must stop to check immediately

9. Compliance with labor protection (protective clothing, safety glasses, gloves) when installing, inspecting, testing