scope:

Objective

This class guideline describes procedures for strength assessment of liquefied gas carriers with membrane tanks in compliance with the rules RU SHIP Pt.5 Ch.7.

In case of discrepancy between the rule RU SHIP Pt.5 Ch.7 and this class guideline, the rule shall prevail.

In general liquefied gas carriers with membrane tanks shall satisfy the strength criteria to main class as given in RU SHIP Pt.3 of the rules. In addition, the criteria for classification notation Tanker for Liquefied Gas as given in RU SHIP Pt.5 Ch.7 apply for the inner hull acting as support for the cargo tank insulation and the membranes. An overview of the ultimate limit state (ULS) and fatigue limit state (FLS) assessment is shown in Figure 1.