Independent Tanks

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These are self-supporting and independent of the hull. There are three
types:


‘Type A’, which are designed primarily using standard traditional methods of
ship-structural analysis. LPG at or near atmospheric pressure of LNG may be
carried in such tanks .

‘Type B’, which are designed using more sophisticated analytical tools and
methods to determine stress levels, fatigue life and crack propagation
characteristics. The overall design concept of these tanks is based on the so
called ‘crack detection before failure principle’ which permits their use with
a reduced secondary barrier (see Figure 25). LNG is normally carried in such
tanks.

‘Type C’, which are designed as pressure vessels, the dominant design
criteria being the vapour pressure. Normally used for LPG and occasionally
ethylene.

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