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barriers

Causation

Ways of exclusion

1．air leaking in water inlet pipe or seal

1.examine the water inlet pipe to exclude leaking and exhaust all of the air in it

no

2．the pump upside down

2．examine and correc

water

0ut

3．the water inlet pipe is too long

3．shorten the pipe

4．the suction lift is too high

4．reduce the suction lift

1．jam in the filter tube or  Vane wheel

1．examine and remove the stemming

not

2．serious abrasion of the seal ring

2．change the seal ring

enough

3．the lift is too high

3．reduce the lift

outlet

water

4．air leaking in water inlet pipe

4．examine and repair the water inlet pipe

5．the suction Iift iS too high，partial cavitation occured

5．reduce the installed height of the pump

and shorten the water inlet wireline