Screw Pump 1. External Bearing; 2. For Lubrication, non-lubrication liquid; 3. For High Viscosity, ... . Vessel: Vessel loading pump, stripping pump, marine ballast pump, main engine lubricating oil pump, fuel transfer pump fuel oil injection pump ... , thick oil and crude oil, etc. Steel and Metallurgy: Main engine lubricating oil pumping, heating boiler jetting. Foodstuff: In production line ...