一, failure forms: insufficient flow

二, the cause analysis:

A, the impeller or inlet and outlet pipeline blocking.

B, severe impeller wear.

C, speed is lower than the specified value.

D, the installation of the pump is not reasonable or suction culvert joint leakage.

E, conveying height is too high, tube resistance loss is too big.

F, the inlet valve open too small or disabled.

G, packing leakage.

H, pump selection is not reasonable.

三, elimination method:

A, remove the impeller or line.

B, replace.

C, adjust the speed.

D, reinstall or blocked air leakage.

E, lower conveying height or decrease the resistance.

F, open the valve.

G, compression packing.

H, selection again.