Abstract: The hydraulic drive plunger diaphragm pump is a new type of high-pressure pump for slurry pipe transportation, which is now under development. Based on the analysis of the features of general diaphragm pumps, the paper presents the working principle of the hydraulic drive plunger diaphragm pump, and points out that how to improve the service life of the diaphragm and to avoid slurry-oil mixing are two crucial factors deciding its successful development. Measures are given as a result of study.

Key words: Slurry pipe transportation, Hydraulic drive plunger diaphragm pump, Diaphragm life, Slurry-oil mixing