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The minimum thickness of the pressurised components must be calculated having regard to the intensity of the stresses and to the following requirements:
the calculation pressure to be taken into account must not be less than the maximum working pressure; and
the permissible general membrane stress must not exceed 0.6 times the yield strength at the maximum working temperature(R or 0.3 times the tensile strength (R whichever value is the lower. The manufacturer must use the minimum values of R and R guaranteed by the producer of the materials in order to determine the permissible stress.
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