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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-71-064 ([Pioneer Natural Gas Company] [J. W. Nanney])

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

Interpretation Response Details

Response Publish Date:

Company Name: Pioneer Natural Gas Company

Individual Name: J. W. Nanney

Location State: TX Country: US

View the Interpretation Document

Response text:

Mr. J. W. Nanney
Design & Construction Engineer
Pioneer Natural Gas Company
P. O. Box 511
Amarillo, Texas 79185

Dear Mr. Nanney:

In response to your letter of June 7, 1971, concerning the requirements of Part 192 of the Federal
Minimum Safety Standards as they apply to testing of underground pipeline crossings of
roadways and railroads, I wish to advise as follows.

The required test pressure for any segment of line is dependent upon the class location of that
segment and the desired maximum operating pressure. The testing requirements of the
regulations do not contain any special requirements for road or railroad crossings.

The regulation for pipe design, as detailed in Paragraph 192.111(b) and (c) do require a more
restrictive design factor (K) for uncased pipelines crossing railroads and roadways or making a
parallel encroachment on such right-of-way in Class 1 and 2 locations. Giving consideration to
Subpart K - Uprating and Section 192.611, Change in class location, the operator may desire to
test the stronger crossing pipe at the same stress level as the remainder of the pipeline. It is
permissible to pretest the segment before this segment is installed to provide for such situations.

We hope this answers your question. If you have any further questions, please do not hesitate to
ask.

Sincerely,

/signed/

Joseph C. Caldwell
Acting Director
Office of Pipeline Safety

Regulation Sections

Section Subject
192.611 Change in class location: Confirmation or revision of maximum allowable operating pressure