# Oklahoma Natural Gas Company — Pipeline Safety Interpretation

- **operation:** document
- **citation:** PI-75-024
- **title:** Oklahoma Natural Gas Company — Pipeline Safety Interpretation
- **source type:** guidance
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** guidance
- **official:** true
- **published on:** 1975-05-30
- **effective on:** Not available
- **summary:** PI-75-024 response to Oklahoma Natural Gas Company concerning 192.111.
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- **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-024
- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1975/PI75024.pdf
**body:**

<<<PAGE 1>>>

May 30, 1975
Mr. J. H. Glamser
Vice President
Oklahoma Natural Gas Company
P.O. Box 871
Tulsa, Oklahoma 74102
Dear Mr. Glamser:
This responds to your letter of April 23, 1975, asking whether in rebuilding a pipeline under the
right-of-way of a public highway in a Class 1 location, a design factor of 0.50 or 0.60 should be
used in the design formula in 49 CFR 192.105 for steel pipe.
Where steel pipe in a Class 1 location, crosses without a casing, or makes a parallel encroachment
on a highway right-of-way, Section 192.111(b)(2) requires that a design factor of 0.60 or less by
used.
In rebuilding the pipeline, the use of a design factor of 0.60 would satisfy Section 192.111(b)(2).
The term "or less" in Section 192.111(b) should not be construed as requiring that a lower design
factor, e.g., 0.50, be used in certain circumstances. Rather, the term "or less" permits the pipe at
the operator's discretion, to be designed for greater strength than that provided by a design factor
of 0.60.
We trust this satisfactorily answers your inquiry.
Sincerely,
Joseph C. Caldwell
Director
Office of Pipeline Safety
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