# Albert Switzer & Associates, Inc. — Pipeline Safety Interpretation

- **operation:** document
- **citation:** PI-72-0102
- **title:** Albert Switzer & Associates, Inc. — Pipeline Safety Interpretation
- **source type:** guidance
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** guidance
- **official:** true
- **published on:** 1972-02-08
- **effective on:** Not available
- **summary:** PI-72-0102 response to Albert Switzer & Associates, Inc. concerning 192.121.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102.json
- **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102.md
- **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102
- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1972/g72-02-08_Kidd_192.121-lmxs.pdf
**body:**

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PI-72-0102
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 4.1.1.4 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.
Sincerely
Joseph C. Caldwell
Acting Director
Office of Pipeline Safety

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Albert Switzer & Associates, Inc.
P.O. Box 14658
3150 Valley Street
Baton Rouge, Louisiana 70808
August 24, 1971
Mr. Marshall W. Taylor
USDT Office of Pipe Line Safety
201 Fannin Street - Suite 315
Houston, Texas
Re: Plastic Pipe
ASA Job No. 326
Dear Mr. Taylor:
Please refer to our conversation this date concerning the use of plastic pipe.
Our firm is designing a natural gas distribution system for a predominately rural area (Classes 1 and 2). The following is
the design information.
ASTM D 2513
Class 200
Station Size Miles PSIG PVC – 2 Wall Thick
A 150
12” 19.6 0.606”
B 123
10” 8.3 0.511”
C 92
8” 9.3 0.410”
D 81
8” 4.2 0.410”
E 65
8” 6.2 0.410”
F 43
6” 2.9 0.316”
G 36
The DOT regulations appear to be silent on pressures above 100 psig and pipe sizes larger than 6".
We would appreciate your review of this information and solicit your recommendations.
Your s truly,
ALBERT SWITZER & ASSOCIATES, INC.
Consulting Engineers
J. M. Kidd, P. E.
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