LNG cryogenic pumping systems: Integral to liquefaction plants, LNG shipping, and regasification terminals.
LNG cryogenic pumping systems are the backbone of the global liquefied natural gas supply chain, operating at various points including liquefaction plants, storage terminals, and transport carriers. These systems are predominantly submerged-motor designs, where the pump and motor are integrated and immersed directly in the cold liquid.
This submerged configuration offers distinct advantages, such as enhanced cooling for the motor and the elimination of problematic rotating shaft seals. Reliability is non-negotiable, as pump failure can halt large-scale operations. Systems vary greatly, from high-capacity cargo pumps on ships to smaller, vessel-mounted pumps used for process feed or boil-off gas handling at terminals.
FAQs:
Q: What is the main advantage of a submerged LNG pump design?
A: The main advantage is that the surrounding LNG acts as both a coolant for the motor and a seal, eliminating the need for complex, failure-prone mechanical seals.
Q: What operational concern must be managed during the startup of an LNG pumping system?
A: The system and associated piping must be carefully pre-cooled to prevent thermal shock to materials and excessive vaporization of the LNG.
Q: Are LNG pumping systems used only for transporting the fuel?
A: No, they are also critical in the liquefaction process, in-tank circulation for thermal management, and in regasification terminals to pressurize the liquid before it is vaporized and sent into pipelines.
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