lng storage tank
LNG storage tanks and pipes are made of austenitic stainless steel. Austenitic stainless steels have excellent low temperature properties. But the linear expansion coefficient is high. under the temperature conditions of liquefied natural gas The shortening rate of stainless steel is about 3/1000, and for the 304L material pipeline, when the working temperature is -162 degrees, the 100 m pipeline can be shortened about 300 mm.
LNG storage tanks and pipes are made of austenitic stainless steel. Austenitic stainless steels have excellent low temperature properties. But the linear expansion coefficient is high. under the temperature conditions of liquefied natural gas The shortening rate of stainless steel is about 3/1000, and for the 304L material pipeline, when the working temperature is -162 degrees, the 100 m pipeline can be shortened about 300 mm.
Shortening and offsetting LNG pipelines is a matter of careful consideration. between two fixed points Cold shrinkage stresses can exceed the material’s yield point.
In particular, the piping requirements in liquefied natural gas storage tanks are becoming more and more stringent, and when problems arise, they will have serious consequences. Pipeline design considers effective ways to compensate. Compensating elbows are used in fittings and piping to compensate for cold shrinkage.
Although the design takes cold shrink into account. But there is a problem that if the rate of change of high temperature Temperature changes will be too rapid and heat stress will increase. This can damage the data and connected components. for this reason Before cooling pipelines and LNG storage tanks enter the cryogenic liquid. It must be done before cooling to ensure its operation.
