# Alabama Public Service Commission — Pipeline Safety Interpretation

**Citation:** PI-71-003  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1971-01-04

PI-71-003 response to Alabama Public Service Commission concerning 192.625.

## Document text

<<<PAGE 1>>>

January 4, 1971
Mr. James B. Williams
Utilities Engineer
Alabama Public Service Commission
P.O. Box 881
Montgomery, Alabama 36102
Dear Mr. Williams:
This is in reply to your letter of December 22, 1970, concerning 49 CFR, Section 192.625,
odorization of gas.
If the line involved is operated at 20% or more of SMYS, under 49 CFR, Section 192.625 as
amended, there is requirement for odorization. If it is operated at less than 20% SMYS you may
initiate a waiver proceeding under Section 3(e) of the Natural Gas Pipeline Safety Act.
Thank you for your interest in pipeline safety.
Sincerely,
/signed/
Joseph C. Caldwell
Director, Acting
Office of Pipeline Safety
DB/dal/192.625
71-01-04.2

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1971/PI71003.pdf>
- Source ID: `phmsa`
- SHA-256: `c824ee8eb8bcc39aca95fe9f1efd8602513baf9f4809d955d05695138334b9ac`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T20:52:18.041Z
- Document slug: `phmsa-interpretation-pi-71-003`

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```