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Interpretation Response #PI-77-006

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date: 02-02-1977
Company Name: Piedmont Natural Gas Company, Inc.    Individual Name: E. L. Manning
Location state: NC    Country: US

View the Interpretation Document

Response text:

February 2, 1977

Mr. E. L. Manning
Vice President Operations Services
Piedmont Natural Gas Company, Inc.
P.O. Box 1968 Charlotte,
North Carolina 28233

Dear Mr. Manning:

This responds to your letter dated October 5, 1976, in which you ask for clarification of the relationship between 49 CFR 192.619(a) and 49 CFR 192.621(a) regarding the maximum allowable operating pressure of pipelines in a high pressure distribution system.

Section 192.619(a) prescribes the maximum allowable operating pressure for all steel and plastic pipelines. Section 192.621(a) prescribes additional limitations which apply to pipelines in high pressure distribution systems. In order to establish a maximum allowable operating pressure for a high pressure distribution pipeline, you must comply with the requirements of both sections.

More specifically, you have asked whether Section 192.619(a)(3) requires that pressure be limited to the highest actual operating pressure occurring during the 5 years preceding July 1, 1970. Under the requirements of Sections 192.619(a) and 192.621(a), this limitation would apply only if it is the lowest pressure among those listed in the two sections and the pipelines concerned were not tested or uprated as stated in Section 192.619(a)(3).


Cesar DeLeon
Acting Director
Office of Pipeline

Regulation Sections

Section Subject
§ 192.621 Maximum allowable operating pressure: High-pressure distribution systems