Can be used in ship industry, cold water treatment, sea water and cold oil, Low pressure valves, rotating equipment, and reciprocating pump hydraulic squeeze machine, the ship propeller equipments.

This paper has approached to the cause for grinding"sense of ad-hesion"and formation of burrs of ram mate part of oil pump in cold working.

Then the view is not large, to choose a pump, plus some oil purification measures, such as the Canadian cold trap, baffle, retaining the oil wells, but also in order to reach a dirty vacuum.