Why are mill test reports required for the Alternate MAOP rule?
The alternate MAOP rule allows operators to establish MAOPs higher than previously allowed by 49 CFR Part 192. One of the requirements is to have adequate documentation to demonstrate the pipe material is suitable for the pressure including (mechanical and chemical properties) on the steel that went into the pipe that will operate under the higher stress levels allowed by the alternate MAOP rule. Such documentation should include mill test reports documenting actual yield strength, tensile strength, and chemical properties of the steel used in the pipe.
