For pipelines installed before the enactment of Federal regulations in 1970, some historical data may require corroboration in order to prove its validity in determining MAOP. For instance, design pressures for pipelines installed before the 1970’s were largely determined by the standards for pressure piping of the day as set forth by the American National Standards Institute (ANSI) and, later, American Society of Mechanical Engineers (ASME). Documented use of those standards for pre-1970’s installations would serve to verify design pressure calculations.
