Potential sinking pumping installation null for liquefied gas tank

摘要

PURPOSE:To provide a maintenance-free submerged pump device for a liquefied gas tank having bearings for reducing the thrust force applied at the time of a start. CONSTITUTION:This submerged pump device is provided with a pump main body 5 having an impeller 5C suspended in a lifting pipe 2 and boosting the liquefied gas sucked into a casing and a discharge hole 12 discharging the boosted liquefied gas, static pressure bearings 5E, 5F, 5G supporting a rotary shaft 5A, a shaft thrust balancing device having a balance disk 5J, a one-side suction type active axial magnetic bearing supporting the rotary shaft 5A, a displacement sensor 5N provided in the casing to detect the position of the rotary shaft 5A, and a controller controlling the magnetic bearing based on the output of the displacement sensor 5N.