This paper pointed out the factors effecting on the ability of flow passing the membrane and pressure loss in the deep sea, and simulation research based on experimental results used MATLAB, and discussed pressure pulsation phenomenon in the pipeline because of pressure test pump ,pipeline etc.

Regarding the damage and leakage of drying gas sealing of multi-stage centrifugal HP ammonia pump, The reason is analyzed as follows: failure of a mechanical seal part pushing ring shaft sleeve inside mechanical seal and fixed shaft sleeve to move outside;increased specific pressure of movable ring and fixed ring;aggravated tear and wear of seal surface, resulting in damage and leakage.

Ltd of Italy adopted for the first time the mediate rate centrifugual HP ammonia pump produced by NP Ltd.