Interpretation Response #PI-73-0115 ([Alabama Public Service Commission] [Mr. Larry L. Waldrop])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Alabama Public Service Commission
Individual Name: Mr. Larry L. Waldrop
Location State: AL Country: US
View the Interpretation Document
Response text:
August 16, 1973
Mr. Larry L. Waldrop
Utilities Engineer
Alabama Public Service Commission
P.O. Box 591
Montgomery, AL 36102
Dear Mr. Waldrop:
This is in response to your letter dated July 26, 1973, in which you ask for further clarification of an interpretation of Section 192.619 that we sent you on June 19, 1973.
You indicate that you would like to resubmit your question to read:
"If a high pressure distribution system, constructed of steel pipe, was tested at 100 psig for a designed maximum operating pressure of 60 psig, is determined to be in good condition and has service lines equipped with single service regulators equipped with full capacity internal relief valves, is the MAOP still 60 psig even though it may have been operated only at somewhat lower pressures for a number of years."
Section 192.619 establishes a maximum allowable operating pressure for all steel and plastic pipelines. The requirements of Section 192.621 are additional requirements which apply to high pressure distribution systems defined in Section 192.3 as those systems in which the gas pressure in the main is higher than the pressure provided to the customer. Therefore, both sections must be complied with when operating a high pressure distribution system in order to establish a maximum allowable operating pressure.
Our answer to this question that we gave you in our letter of June 19, 1973, is still correct. The MAOP is 30 lbs.
If you have any further questions in this regard, please let us know.
Sincerely,
Joseph C. Caldwell
Director
Office of Pipeline Safety