A stress and rigidity evaluation method for a double-wall pipe flange

Abstract

The invention discloses a stress and rigidity evaluation method for a double-wall pipe flange. The method comprises the steps that theoretical stress values of the double-wall pipe flange under different loading conditions are obtained; whether the theoretical stress value is equal to or larger than the minimum pressing force value of a flange gasket or not is judged; when the theoretical stress value is equal to or larger than the minimum pressing force value, it shows that the rigidity of the double-wall pipe flange meets the requirement; when the theoretical stress value is smaller than the minimum pressing force value, it is considered that the rigidity of the double-wall pipe flange does not meet the requirement; when the rigidity of the double-wall pipe flange meets the requirement, test stress values of the double-wall pipe flange under different loading conditions are obtained; and under the same loading condition, the theoretical stress value is corrected by using the test stress values. By comparing the theoretical stress value of the double-wall pipe flange with the minimum pressing force value of the flange gasket, stress and rigidity analysis can be conducted on the double-wall pipe flange in the double-wall pipe design stage, then the sealing performance of the double-wall pipe is obtained, and guidance is provided for safe operation of a ship.

Description

technical field [0001] The present application relates to the technical field of calculation of double-wall pipes, in particular to a method for evaluating the force and stiffness of double-wall pipe flanges. Background technique [0002] As a clean energy source, liquefied natural gas has attracted wide attention from shipping companies, and dual-fuel marine engines based on liquefied natural gas have become one of the mainstream models of marine engines. Considering the flammable and explosive properties of LNG, the LNG gas supply system adopts a double-wall pipe structure, which includes an outer pipe, an inner pipe, and a double-wall pipe flange connecting the outer pipe and the inner pipe. The structure enables the air flowing through the outer pipe to transport the liquefied natural gas leaked from the inner pipe to the outside of the cabin, ensuring the safe operation of the ship. [0003] As a connecting part between pipes, the stiffness of the double-wall pipe flan...

AI Technical Summary

Problems solved by technology

The stiffness of the double-wall pipe flange is related to the force of the double-wall pipe flange. In order to ensure that the double-wall pipe has good sealing performance, it is necessary to evaluate the force and stiffness of the double-wall pipe flange under different operating conditions, but , and there is no reasonable force and stiffness evaluation method for double-wall pipe flanges

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