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Interpretation Response #PI-72-0102 ([Albert Switzer & Associates, Inc.] [Mr. J. M. Kidd])

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

Interpretation Response Details

Response Publish Date:

Company Name: Albert Switzer & Associates, Inc.

Individual Name: Mr. J. M. Kidd

Location State: LA Country: US

View the Interpretation Document

Response text:


February 8, 1972

Mr. J. M. Kidd
Albert Switzer & Associates, Inc.
Consulting Engineers
P.O. Box 14658
Barton Rouge, Louisiana 70808

Dear Mr. Kidd

This letter is in regard to your inquiry to and subsequent discussions with Mr. Marshall Taylor of our Houston field office relative to the use of plastic pipe.
You stated that your firm is designing a natural gas distribution system for a predominately rural area (Class Locations 1 & 2), and supplied design information that shows sizes ranging from 6”to 12” and pressures from 36 to 150 psig.

In your letter you state, “The DOT regulations appear to be silent on pressure above 100psig and pipe sizes larger than 6”

ASTM D2513, Thermoplastic Gas Pressure Pipe, Tubing and Fittings referenced in Section I of Appendix B of 49 CFR, part 192 includes specifications for thermoplastic pipe. Section of ASTM D2513 references specifications for Poly Vinyl Chloride (PVC) Plastic pipe (SDR-PR and Class T) with the noted limitations.

With regard to your comment on pressures above 100 psig, we refer you to Sections 192.121 and 192.123 which specify the design limitations for the operating pressures of plastic pipe meeting all other requirements of the regulations.

If you have further questions, please advise.

Joseph C. Caldwell
Acting Director
Office of Pipeline Safety

Regulation Sections

Section Subject
192.121 Design of plastic pipe