Interpretation Response #PI-74-017 ([Tennessee Public Service Commission] [John Searcy])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Tennessee Public Service Commission
Individual Name: John Searcy
Location State: TN Country: US
View the Interpretation Document
Response text:
Mr. John Searcy
Engineering Division
Tennessee Public Service Commission
Cordell Hull Building
Nashville, TN 37219
Dear Mr. Searcy:
This responds to your letter of February 21, 1974, concerning uprating requirements for steel
pipelines operated at 100 psig, or more, with hoop stresses less than 30 percent of SMYS. You
ask whether "the pressure must be increased in the increments required to the desired maximum
allowable operating pressure times the appropriate factor in the table in 192.619(a)(2)(ii)?"
Subject to the requirements of section 192.621, the maximum allowable operating pressure
(MAOP) for the pipelines to which you refer may not be increased above the lowest pressure
determined in accordance with action 192.619(a). In uprating to a pressure permitted by section
192.619(a)(2)(ii), a strength test must be performed. The increments prescribed by section
192.557(c) apply to the increase in pressure between the existing MAOP and the test pressure or
the desired MAOP multiplied by the appropriate factor in section 192.619(a)(2)(ii).
Thank you for your interest in pipeline safety.
Sincerely,
s/Cesar DeLeon
Joseph C. Caldwell
Director
Office of Pipeline Safety