LNG INDEPENDENT TANK

LNG Fundamentals

In Handbook of Liquefied Natural Gas, 2014

Freestanding tanks

The freestanding or independent tanks are self-contained, usually spherical (developed by Moss Maritime of Norway) or prismatic in shape (designed by Conch International Methane Ltd), and made of aluminum alloy or 9% nickel steel with layers of insulation on the outside (Figures 1-7 and 1-8). Independent tanks are completely self-supporting and do not form part of the ship’s hull structure. Moreover, they do not contribute to the hull strength of a ship (McGuire and White, 2000). The tanks are welded to cylindrical skirts or otherwise tied to supporters that are welded to the ship structure.

As defined in the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk), and depending mainly on the design pressure, there are three different types of independent tanks for gas carriers. These are ones built according to standard oil tank design (Type A), others that are of pressure vessel design (Type C), and, finally, tanks that are neither of the first two types (Type B). All LNG tanks are Type B from the Coast Guard perspective, because Type B tanks must be designed without any general assumptions that go into designing the other tank types. The self-supporting, prismatic Type B (SPB) tank is independent of the ship’s structure and has the advantage over its spherical version of making maximum use of the available cargo space. However, they contribute significantly to weight and cost due to the fact that free-standing prismatic tanks include heavy plates and a considerable amount of bracing to keep the plates from distorting under hydrostatic load.


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