# Rockwell Manufacturing Company — Pipeline Safety Interpretation

**Citation:** PI-70-022  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1970-12-17

PI-70-022 response to Rockwell Manufacturing Company concerning 192.145.

## Document text

<<<PAGE 1>>>

Mr. E. B. Perrine
Chief Engineer
Rockwell Manufacturing Company
Porterville Plant
Porterville, California 93267
Dear Mr. Perrine:
This is in reply to your letter of December 7, 1970, requesting an interpretation of 49 CFR,
Section 192.145(c)(2) regarding welding of ductile iron components.
Section 192.145(c((2) is taken directly from the B31.8 Code, 1968 edition, paragraph 831.11(b)
and prohibits such welding.
If you have further questions do not hesitate to ask.
Sincerely,
/signed/
Joseph C. Caldwell
Director, Acting
Office Pipeline Safety
DB
C:\WP51\INTERPRT\192\145\70-12-17
1

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1970/PI70022.pdf>
- Source ID: `phmsa`
- SHA-256: `81f944315bd07ab68d3f4263523047df8c0556761a0d6d3f34e561691cc2315c`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-24T09:32:54.111Z
- Document slug: `phmsa-interpretation-pi-70-022`

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```