VORRICHTUNG ZUM PUMPEN EINER FLUESSIGKEIT, INSBESONDERE EINES VERFLUESSIGTEN GASES, AUS EINEM TANK.

摘要

A submersible pumping system for pumping cryogenic liquid from a reservoir 10 has a pump and motor unit 26 which is lowered to the bottom of a fluid transmitting casing 14 in the reservoir. An isolation chamber 24 is provided in the casing above the roof of the reservoir into which the pump and motor unit is raised for removal, and an associated isolation valve 18 is provided. A special sealing arrangement comprising sealing elements 74 and a vertical tube 62 maintains the casing and reservoir isolated from the atmosphere when lifting the pump and motor unit, yet allows a flexible suspension cable to be utilized.