Abstract: Taking the maintenance of the IGG cooling seawater pump in the rear cabin of the FPSO and the hoisting of the large seawater lifting pump in the front cabin as examples,this paper describes the two problems solved in the maintenance of the seawater pump of the offshore oil platform：① Solve the problem of frequent failures of the IGG cooling water pump：The causes of pump cavitation and bearing high temperature are analyzed one by one in terms of pump disassembly status,component data measurement,on-site maintenance,technological process,etc.,which can be used for reference and promotion for the troubleshooting of similar pumps. ② Solve the hoisting problem of large pumps in the restricted space of the bilge：The special tools for the lifting beam of the seawater lift pump are designed and processed to realize the overall hoisting of the pump drive motor,the vertical force of the four chains solves the safety hazard of excessive sling angle,and the attached quick hook eliminates the cumbersome binding of the sling in the past,which is safe and efficient and reduces maintenance man-hours. At present,the lifting beam of the seawater lifting pump has been put into use,which provides safety and convenience for on-site maintenance operations.

Key words: centrifugal pump, cavitation, lifting beam tool, reliability