Fitness for Service - General Metal Loss (Piping)

API 579-1 (2016) Part 4 Level 1 / 2 Assessment

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This calculation can be used to assess resistance to internal pressure for piping not subject to significant external loads (as external loads are not considered there is no check performed on longitudinal stresses).
This calculation takes a single average thickness reading - it is assumed that point thickness readings or critical thickness profiles have been managed separately in order to get the average thickness.
As it does not apply to components operating in the creep range, the B31 'W' factor does not apply.
Calculation should be carried out by a qualified mechanical engineer.