# Tennessee Public Service Commission — Pipeline Safety Interpretation

**Citation:** PI-75-006  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1975-01-29

PI-75-006 response to Tennessee Public Service Commission concerning 192.611.

## Document text

<<<PAGE 1>>>

Mr. John Searcy
Tennessee Public Service Commission
Engineering Division
Cordell Hull Building
Nashville, TN 37219
Dear Mr. Searcy:
Your letter of January 6, 1975, asks whether 49 CFR 192.611 applies to pipelines operating at
any pressure. Although this rule applies to pipelines operating at any pressure, it is only relevant
to a pipeline operating at a pressure which produces a hoop stress of more than 40 percent of the
pipeline's specified minimum yield strength.
Sincerely,
/signed/
Joseph C. Caldwell
Director
Office of Pipeline Safety
DB
C:\WP51\INTERPRT\192\611\75-01-29
1

<<<PAGE 2>>>

January 6, 1975
Mr. Joseph C. Caldwell, Director
Office of Pipeline Safety
Department of Transportation
2100 Second Street, SW
Washington, D. C. 20590
Dear Mr. Caldwell:
Is 192.611 applicable to pipelines operating at any pressure?
Sincerely,
John Searcy
Engineering Division
DB
C:\WP51\INTERPRT\192\611\75-01-29
2

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1975/PI75006.pdf>
- Source ID: `phmsa`
- SHA-256: `535c42e7be07721cd99787651c657ece5890885e0c918fe37887604229e02f83`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-25T07:07:40.577Z
- Document slug: `phmsa-interpretation-pi-75-006`

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