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The Simple Pressure Vessels (Safety) Regulations 1991
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- 1991 No. 2749
- SCHEDULE 1
- PART 2
- Regulation 9
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Wall thickness
9. In the case of vessels of Category A.2 or A.3 whose maximum working temperature does not exceed 100° C, the manufacturer must select either the calculation method or the experimental method, as defined below, for determining vessel wall thickness.
In the case of vessels in Category A.1 or vessels in Category A.2 or A.3 whose maximum working temperature exceeds 100° C, the calculation method must be used.
However, the actual wall thickness of the cylindrical component and ends must in any case be not less than 2 millimetres in the case of steel vessels, and not less than 3 millimetres in the case of aluminium or aluminium alloy vessels.
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