4.2.3 Semi-membrane tanks
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4.2.3 Semi-membrane tanks

  4.2.3.1 Semi-membrane tanks are non-self-supporting tanks in the loaded condition and consist of a layer, parts of which are supported through insulation by the adjacent hull structure, whereas the rounded parts of this layer connecting the above-mentioned supported parts are designed also to accommodate the thermal and other expansion or contraction.

  4.2.3.2 The design vapour pressure P o should not normally exceed 0.25 bar. If, however, the hull scantlings are increased accordingly, and consideration is given, where appropriate, to the strength of the supporting insulation, P o may be increased to a higher value but less than 0.7 bar.

Parent topic: 4.2 Definitions
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