Why does PHMSA consider it acceptable for operation at pressures and pipeline stress levels higher than previously allowed?
The proposed changes were made possible by improvements in pipeline technology and risk controls over the past 25 years. The original standards for calculating MAOP on gas transmission pipelines were adopted in 1970. Almost all risk controls on gas transmission pipelines have been strengthened in the intervening years, beginning with the introduction of improved manufacturing, metallurgy, testing, and assessment tools and standards. Pipe manufactured and tested to modern standards is far less likely to contain defects that can grow to failure over time than pipe manufactured and installed a generation ago.
Related Questions
- How will PHMSA handle Special Permit requests to allow pipeline operation at higher stress levels that were submitted prior to the issuance of the alternative MAOP Rule?
- Are the regulatory provisions allowing pipeline operation at higher pressures and stress levels consistent with engineering standards?
- Why does PHMSA consider it acceptable for operation at pressures and pipeline stress levels higher than previously allowed?
