Under this final rule, the maximum allowable operating pressure (MAOP) of a pipeline may be confirmed or revised as a specified percentage of its past test pressure, provided the test was conducted for at least 8 hours. Previously, a pipeline must have been tested to at least 90 percent of the specified minimum yield strength (SMYS) of the pipe to qualify for this method of confirming or revising MAOP This rule change may reduce the need to retest pipelines for which past test pressures provide an adequate safety basis for current operating pressures.