The Cryodynamics line of submerged motor pumps and expanders is well suited to the growing business of floating installations. Floating storage and regasification unit (FSRU), floating production storage and offloading (FPSO), and floating liquefied natural gas (FLNG) vessels benefit greatly from cryogenic technology. The compact design of a submerged pump or expander results in a machine approximately half the size and a third of the weight of an equivalent external motor pump or expander (with an external generator), an important advantage where space and weight are at a premium.
All of the Cryodynamics product lines are available for floating service. ECC model pumps are used in high-pressure send-out service on FSRUs and in several process services on FPSOs. Retractable ECR model pumps service the storage tanks on the vessels. Liquid expanders (model LX) are found on the FLNG topside module. Cryodynamics experience in marine service, such as shipboard cargo and gas fuel pumps, is used to maintain high performance and reliability in floating service.
Floating service pumps are subjected to additional loads due to ship hull motion.These loads are present during sea towing and during operation while moored at site. Vessel mounted pumps and expanders (ECC and LX) incorporate additional lateral supports to reduce the loads on the suction or discharge vessel mounting lugs. These supports are derived from shipboard cargo pumps (model EC). Within the pump’s vessel, the pump is protected from lateral loads by a lower support rod. In-tank retractable pumps use a deep-seat style suction valve or a rigid retraction system to prevent the pump unseating from the valve seal surface during hull motion. In cases of extreme loads, it is also possible to fit the pump with a shaft locking device that prevents any movement of the shaft during shutdown while the ship is subjected to severe motions. It can be externally controlled and wired into the plant safeguarding system with appropriate interlocks. All floating service pumps and expanders use the proven TEM® thrust balance system.