11.1.1 Where particular designs or the materials of construction (such as carbon
reinforced plastics or glass reinforced plastics) are beyond the scope of preceding
sections detailed calculations, together with supporting experimental evidence of
satisfactory service of an equivalent design are to be submitted for consideration.
Should the material creep at ambient temperatures, the factor of safety used for the
design is to be that applicable to the hull structure at the designed depth/pressure
and maximum design temperature.
11.1.2 Consideration is to be given, at the design stage of a chamber or
submersible, to the avoidance of fatigue failure from cyclic or repeated stress
during the working life due to pressure cycles / external load (acceleration)
cycles. In this respect compliance with the relevant requirements of a National or
international code/standard for the design and construction of pressure vessels
(e.g. PD 5500, ASME Sect VIII) is acceptable to LR.