# Tennessee Public Service Commission — Pipeline Safety Interpretation

**Citation:** PI-75-013  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1975-03-24

PI-75-013 response to Tennessee Public Service Commission concerning 192.63.

## Document text

<<<PAGE 1>>>

Mr. John S. Searcy, Director
Engineer Division
Tennessee Public Service Commission
Cordell Hull Building
Nashville, Tennessee 37129
Dear Mr. Searcy:
This responds to you letter of February 20, 1975, asking whether the incorporation by reference
of MSS-SP-25 un 49 CFR 192.63 includes the document MSS-SP-63 to the extent that it is
incorporated by reference in Section 18 of MSS-SP-25.
The reference to MSS-SP-63 in Section 18 of MSS-SP-25 incorporates a portion of MSS-SP-63
essential to the basic document MSS-SP-25. To the extent that MSS-SP-63 is incorporated by
reference in MSS-SP-25, it is also incorporated in 49 CFR 192.63.
Sincerely,
/Signed/
Joseph C. Caldwell
Director
Office of Pipeline Safety
DB
C:\WP51\INTERPRT\192\63\75-03-24
1

<<<PAGE 2>>>

Mr. Joseph Caldwell
Dept. of Transportation
Office of Pipeline Safety
2100 2nd Street, SW
Washington, D. C. 20590
Dear Mr. Caldwell:
Regulation 192.63(a) states that "Except as provide in paragraph(d) ... each valve, fitting,
length of pipe, and other component must be marked as prescribed in-(1) The specification to
which it was manufactured; or (2) MSS...SP-25."
Section 18 of MSS SP-25 states "Fittings for use in gas transmission and distribution
system...(18.1) Markings for these fittings shall be those shown in MSS SP-63."
192.63 does not specifically reference MMS SP-63, which, from the title, applies only to high
strength wrought welding fittings. It is a correct interpretation that MSS SP-63 is not
automatically incorporated, and that MSS SP-25, not MSS SP-63, would govern the marking of
fittings for use in gas transmission and distribution?
Sincerely,
John S. Searcy, Director
Engineering Division
DB
C:\WP51\INTERPRT\192\63\75-03-24
2

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1975/PI75013.pdf>
- Source ID: `phmsa`
- SHA-256: `4f097733f820a27b62107700ba1f56dc4f8463294844d061becbb2a6f73e9b21`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T22:07:34.689Z
- Document slug: `phmsa-interpretation-pi-75-013`

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