scope:

Specifies a method for calculating the maximum allowable hoop stress applicable to pipes exposed to varying internal pressures and/or temperature during their expective lifetime. This method is generally known as Miner's rule. It is necessary to apply Miner's rule to each failure mechanisms separately. Thus, for mechanical failure due to internal pressure, other failure mechanisms, such as oxidative or dehydrochlorinative degradative failure mechanisms, are to be neglected (assuming, of course, no interaction). A material may be used only when it is proven to conform to all failure mechanisms criteria.