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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-75-0107 ([The Public Utilities Commission] [Mr. Ray A. Richardson])

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

Interpretation Response Details

Response Publish Date:

Company Name: The Public Utilities Commission

Individual Name: Mr. Ray A. Richardson

Location State: CO Country: US

View the Interpretation Document

Response text:

JUN 19 1975

Mr. Ray A. Richardson
State of Colorado
The Public Utilities Commission
500 Columbine Building
1845 Sherman Street
Denver, Colorado 80203

Dear Mr. Richardson:

This responds to your letter of June 3, 1975, concerning the pressure test required in uprating to a pressure permitted by Section 192.619(a)(2)(ii) and the leak check required by Section 192.553(a)(1).

We believe the following excerpts from a recent interpretation by this Office answer your questions:

"Subject to the requirements of Section 192.621 or Section 192.623, as the case may be, the maximum allowable operating pressure for a pipeline may not be increased above the lowest pressure determined under Section 192.619(a). For a steel pipeline operated at 100 psig or more, in uprating under Section 192.557 to a pressure permitted by Section 192.619(a)(2)(ii), a pressure test must be performed under that Section. Steel pipelines operated at less than 100 psig may be uprated under Section 192.557 to a pressure permitted by Section 192.619(a) without conducting a pressure test. Where a pressure test is performed in up rating under Section 192.557, the standards do not specify the nature of the test. However, the provisions of Section 192.507, applicable to tests on new or replaced or relocated pipe, can serve as a guide.

"In conjunction with uprating, Section 192.553(a)(1) requires incremental pressure increases to be held while the pipeline is checked for leaks. This leak check may be performed by survey, and there is no minimum time specified for holding the pressure."

If we may be of further assistance, please let us know.


Joseph C.Caldwell
Office of Pipeline Safety

Regulation Sections

Section Subject
192.507 Test requirements for pipelines to operate at a hoop stress less than 30 percent of SMYS and at or above 100 p.s.i. (689 kPa) gage
192.553 General requirements
192.557 Uprating: Steel pipelines to a pressure that will produce a hoop stress less than 30 percent of SMYS: plastic, cast iron, and ductile iron pipelines
192.619 Maximum allowable operating pressure: Steel or plastic pipelines
192.621 Maximum allowable operating pressure: High-pressure distribution systems