How is overpressure protection addressed when operation is at a higher alternative MAOP?
The alternative MAOP is higher than the upper limit of the required overpressure protection under previous regulations for surge events. New section 49 CFR 192.620(e) increases the overpressure protection limit to 104 percent of the MAOP, which is 83.2 percent of SMYS for a pipeline segment operating at the alternative MAOP in a Class 1 location.
