Centrifugal pump what are the common faults and troubleshooting? (one)

Centrifugal pumps often occur in the operation of a variety of faults for many reasons, the occurrence of different parts, mostly due to maintenance, installation of poor quality, or improper operation and maintenance caused.
The following is a variety of centrifugal pump failure phenomenon, causes of failure and treatment methods.

Symptoms
Cause of the malfunction
Approach
Pumping dissatisfaction
1 , the end of the valve closed lax pipette leak
2 , the end of the valve is broken
1 , overhaul bottom valve and pipette
2 , repair or replace the bottom valve
The pump is not aspirated, the vacuum gauge indicates a high degree of vacuum
1 , the bottom valve is not open or filter part of the blockage
2 , pipette resistance is too large
3 , inhalation height is too high
4 , part of the liquid immersion depth is not enough
1 , overhaul the end of the valve or cleaning filter part
2 , wash or replace the pipette
3 , appropriate to reduce the suction liquid height
4 , increase the immersion depth of the suction part
The pump is not aspirated, the vacuum and the gauge needle violently beat
1 , before driving the pump fluid shortage
2 , suction system pipe or instrument leak
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3 , the pipette is not immersed in the liquid or immersed in depth enough
1 , stop the pump liquid filled
2 , check the pipette and instrumentation, and to eliminate leaks or block leaks
3 , lower the pipette, so immersed in the liquid to a certain depth
Although the pressure gauge pressure, but no liquid drain
1 , drain resistance is too large
2 , tower operating pressure is too high
3 , impeller steering wrong
4 , Impeller flow blockage
5 , pump head is not enough
6 , drain pipe valve closed
1 , cleaning the drain pipe or reduce the pipe elbow
2 , contact with the operator, adjust the tower pressure
3 , exchange the motor wiring
4 , cleaning the impeller
5 , replace the high-lift pump pump in series
6 , open the drain valve
Insufficient flow or no suction
1 , seal ring radial gap increases, increased internal leakage
2 , impeller flow blockage, affecting circulation
3 , part of the suction resistance is too large, such as part of the filter blockage, elbow too much, the end of the valve is too small
4 , suction height is too large
5 , part of the liquid immersion concentration is not enough, there is air into
6 , suction part of the seal is not tight
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7 , the pipette is not installed properly, so there is accumulation of air in the tube there
8 , drain resistance is too large, or not enough to open the outlet valve
9 , tower operating pressure is too high
10 , conveying liquid temperature is too high, the pump cavitation phenomenon, can not be continuous water
11 , pump flow is too small
1 , repair seal ring
2 , cleaning impeller runner
3 , cleaning the filter to reduce the elbow and replace the bottom valve
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4 , reduce the suction height
5 , increase the immersion depth of the suction part
6 , overhaul parts of the suction joints sealing, tighten the nut or replace the packing
7 , reinstall the pipette
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8 , cleaning the pipe, or appropriate to open the outlet valve
9 , and operator contact, adjust the tower pressure
10 , appropriate to reduce the temperature of liquid transport, reducing the installation of the pump height, leaving allowed cavitation margin
11 , replace the large flow pump
Symptoms
Cause of the malfunction
Approach
Pumping dissatisfaction
1 , the end of the valve closed lax pipette leak
2 , the end of the valve is broken
1 , overhaul bottom valve and pipette
2 , repair or replace the bottom valve
The pump is not aspirated, the vacuum gauge indicates a high degree of vacuum
1 , the bottom valve is not open or filter part of the blockage
2 , pipette resistance is too large
3 , inhalation height is too high
4 , part of the liquid immersion depth is not enough
1 , overhaul the end of the valve or cleaning filter part
2 , wash or replace the pipette
3 , appropriate to reduce the suction liquid height
4 , increase the immersion depth of the suction part
The pump is not aspirated, the vacuum and the gauge needle violently beat
1 , before driving the pump fluid shortage
2 , suction system pipe or instrument leak
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3 , the pipette is not immersed in the liquid or immersed in depth enough
1 , stop the pump liquid filled
2 , check the pipette and instrumentation, and to eliminate leaks or block leaks
3 , lower the pipette, so immersed in the liquid to a certain depth
Although the pressure gauge pressure, but no liquid drain
1 , drain resistance is too large
2 , tower operating pressure is too high
3 , impeller steering wrong
4 , Impeller flow blockage
5 , pump head is not enough
6 , drain pipe valve closed
1 , cleaning the drain pipe or reduce the pipe elbow
2 , contact with the operator, adjust the tower pressure
3 , exchange the motor wiring
4 , cleaning the impeller
5 , replace the high-lift pump pump in series
6 , open the drain valve
Insufficient flow or no suction
1 , seal ring radial gap increases, increased internal leakage
2 , impeller flow blockage, affecting circulation
3 , part of the suction resistance is too large, such as part of the filter blockage, elbow too much, the end of the valve is too small
4 , suction height is too large
5 , part of the liquid immersion concentration is not enough, there is air into
6 , suction part of the seal is not tight
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7 , the pipette is not installed properly, so there is accumulation of air in the tube there
8 , drain resistance is too large, or not enough to open the outlet valve
9 , tower operating pressure is too high
10 , conveying liquid temperature is too high, the pump cavitation phenomenon, can not be continuous water
11 , pump flow is too small
1 , repair seal ring
2 , cleaning impeller runner
3 , cleaning the filter to reduce the elbow and replace the bottom valve
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4 , reduce the suction height
5 , increase the immersion depth of the suction part
6 , overhaul parts of the suction joints sealing, tighten the nut or replace the packing
7 , reinstall the pipette
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8 , cleaning the pipe, or appropriate to open the outlet valve
9 , and operator contact, adjust the tower pressure
10 , appropriate to reduce the temperature of liquid transport, reducing the installation of the pump height, leaving allowed cavitation margin
11 , replace the large flow pump

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Symptoms	Cause of the malfunction	Approach
Pumping dissatisfaction	1 , the end of the valve closed lax pipette leak 2 , the end of the valve is broken	1 , overhaul bottom valve and pipette 2 , repair or replace the bottom valve
The pump is not aspirated, the vacuum gauge indicates a high degree of vacuum	1 , the bottom valve is not open or filter part of the blockage 2 , pipette resistance is too large 3 , inhalation height is too high 4 , part of the liquid immersion depth is not enough	1 , overhaul the end of the valve or cleaning filter part 2 , wash or replace the pipette 3 , appropriate to reduce the suction liquid height 4 , increase the immersion depth of the suction part
The pump is not aspirated, the vacuum and the gauge needle violently beat	1 , before driving the pump fluid shortage 2 , suction system pipe or instrument leak Â 3 , the pipette is not immersed in the liquid or immersed in depth enough	1 , stop the pump liquid filled 2 , check the pipette and instrumentation, and to eliminate leaks or block leaks 3 , lower the pipette, so immersed in the liquid to a certain depth
Although the pressure gauge pressure, but no liquid drain	1 , drain resistance is too large 2 , tower operating pressure is too high 3 , impeller steering wrong 4 , Impeller flow blockage 5 , pump head is not enough 6 , drain pipe valve closed	1 , cleaning the drain pipe or reduce the pipe elbow 2 , contact with the operator, adjust the tower pressure 3 , exchange the motor wiring 4 , cleaning the impeller 5 , replace the high-lift pump pump in series 6 , open the drain valve
Insufficient flow or no suction	1 , seal ring radial gap increases, increased internal leakage 2 , impeller flow blockage, affecting circulation 3 , part of the suction resistance is too large, such as part of the filter blockage, elbow too much, the end of the valve is too small 4 , suction height is too large 5 , part of the liquid immersion concentration is not enough, there is air into 6 , suction part of the seal is not tight Â 7 , the pipette is not installed properly, so there is accumulation of air in the tube there 8 , drain resistance is too large, or not enough to open the outlet valve 9 , tower operating pressure is too high 10 , conveying liquid temperature is too high, the pump cavitation phenomenon, can not be continuous water 11 , pump flow is too small	1 , repair seal ring 2 , cleaning impeller runner 3 , cleaning the filter to reduce the elbow and replace the bottom valve Â 4 , reduce the suction height 5 , increase the immersion depth of the suction part 6 , overhaul parts of the suction joints sealing, tighten the nut or replace the packing 7 , reinstall the pipette Â 8 , cleaning the pipe, or appropriate to open the outlet valve 9 , and operator contact, adjust the tower pressure 10 , appropriate to reduce the temperature of liquid transport, reducing the installation of the pump height, leaving allowed cavitation margin 11 , replace the large flow pump