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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-74-0128 ([Colorado Public Utilities Commission] [Mr. Ray 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: Colorado Public Utilities Commission

Individual Name: Mr. Ray Richardson

Location State: CO Country: US

View the Interpretation Document

Response text:

Mr. Ray Richardson
Colorado Public Utilities Commission
500 Columbine Building
1845 Sherman Street
Denver, CO  80203

Dear Mr. Richardson:

This responds to your letter of June 24, 1974, asking, with respect to uprating a pipeline, when an operator must use an incremental pressure test procedure and when the operator may use a one-step pressure test under Subpart J.

Subpart K regulates the uprating of pipelines.  Sections 192.555(e) and 192.557(e), as applicable, require any increase in the maximum allowable operating pressure to be made in increments, except where a pipeline is uprated under section 192.555(d) (1).  Section 192.555(d)(1) applies only to steel pipelines and involves uprating to a hoop stress of 30 percent or more of SMYS and testing in accordance with Subpart J.  In this subpart, the pressure test required for pipelines operated at 30 percent or more of SMYS under section 192.505 is a one-step procedure.

We trust our response is helpful to you.


Joseph C. Caldwell      
Office of Pipeline Safety

Regulation Sections

Section Subject
192.505 Strength test requirements for steel pipeline to operate at a hoop stress of 30 percent or more of SMYS