PLASTICS PIPES FOR THE CONVEYANCE OF FLUIDS UNDER PRESSURE – MINER’S RULE – CALCULATION METHOD FOR CUMULATIVE DAMAGE (ISO 13760:1998, IDT)
This Malaysian Standard specifies a method for calculating the maximum allowable hoop stress applicable to pipes exposed to varying internal pressures and/or temperatures during their expected lifetime. This method is generally known as Miner's rule.
It is necessary to apply Miner's rule to each failure mechanism separately. Thus, for mechanical failure due tointernal pressure, other failure mechanisms, such as oxidative or dehydrochlorinative degradative failuremechanisms, are to be neglected (assuming, of course, no interaction). A material may be used only when it isproven to conform to all failure mechanism criteria.
NOTE — Miner's rule is an empirically based procedure, and is only a first approximation to reality.
