This article introduces the common faults for DA pumps,analyses the causes and provides the countermeasures.

This topic originates from an item on technical innovation in Pingzhuang coal mine of Chifeng , which mainly researched the theory of the multi-level centrifugal water pump capability parameter testing ,the analyzed errors and built the measurement and control system and guarantees the examination system to achieve the precision in B level provided by state.

The pump consists of prime motor, multi stage centrifugal pump, seat, wire and control, in which the key part is the prime motor.

This paper analyses the reasons on unusal ware about balance tray of multistage centrifugal pumps.

Cause Analysis of the Leakage of the Machinery Seals of the Multi-Stage Centrifugal Pumps in Spherical Tank Zones and Retrofits;

Reasons for abnormal vibration of multi-stage centrifugal pump are analyzed.

[1]Presently, there are two pumping systems for the water injection in Shengli oilfield, multi-stage centrifugal pump and high pressure piston pump.

Treatment of unusual axial moving in multistage centrifugal pump;

A dynamic wedge balance disc for multistage centrifugal pumps;

A three-dimensional turbulent flow through a multistage centrifugal pump is numerically simulated using FLUENT software,including flow fields in impeller and diffuser.