engleski

Remedy for Misalignment of Bilobe Tank Heads in Liquefied Petroleum Gas Carrier

The article describes the remedy for a misalignment of Y-joint in hemispherical and torispherical heads of the bilobe cargo tank on a Liquefied Petroleum Gas Carrier. The misalignment is the result of connecting relatively thin shells and production difficulties. The measured rather large shell eccentricity in the Y-jont causes bending moment, which cannot be withstood by shells designed as membrane, and therefore it has to be controlled. The remedy of misalignment is achieed by reinforcement of the Y-joint with inside and outside bars and knees. In this way stress concentration determined by the FEM analysis is reduced with the allowable stress given for secondary stress level.

LPG carrier; bilobe tank; misalignment; reinforcement; strength analysis; FEM

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