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How can the maximum allowable working pressure be established for nonstandard boilers or unfired pressure vessels?

April 26, 2017allowable boilers maximum nonstandard pressure unfired vessels working

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How can the maximum allowable working pressure be established for nonstandard boilers or unfired pressure vessels?

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The maximum allowable working pressure MAWP of cylindrical components under internal pressure shall be established as follows: (1) For nonstandard steel low pressure steam heating boilers the MAWP shall be computed from the formula in subsection (5) of this section not exceeding 15 psi steam. (2) For nonstandard steel low pressure water heating boilers the MAWP shall be computed from the formula in subsection (5) of this section not exceeding 30 psi. (3) For nonstandard cast iron low pressure steam heating boilers the MAWP shall not exceed 15 psi steam. (4) For nonstandard cast iron low pressure water heating boilers the MAWP shall not exceed 30 psi. (5) For boilers and unfired pressure vessels not listed above, where the original code of construction is unknown, the following formula will be used.