# The Gas Service Company — Pipeline Safety Interpretation

**Citation:** PI-73-027  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1973-10-12

PI-73-027 response to The Gas Service Company concerning 192.357.

## Document text

<<<PAGE 1>>>

October 12, 1973
Mr. A. C. Singer
Vice President of Operations
The Gas Service Company
700 Scarritt Building
Kansas City, MO 64142
Dear Mr. Singer:
In your letter of September 24, 1973, you requested an interpretation of Paragraph 192.357(d),
Title 49, Code of Federal Regulations, which reads as follows:
"Each regulator that might release gas in its operation must be vented to the outside
atmosphere."
Your specific question was whether the above paragraph requires an outside vent on service
regulators which are installed inside, and which are not equipped with relief facilities. Since they
do not release gas in their operation, you have considered such regulators as constituting a closed
system.
Your interpretation is correct. Since there is no release of gas in the operation of such a service
regulator, that regulator need not be vented to the outside atmosphere.
If we may assist further, please let us know.
Sincerely,
\signed\
Joseph C. Caldwell
Director
Office of Pipeline Safety
dal\192\357\73-10-12
1

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1973/PI73027.pdf>
- Source ID: `phmsa`
- SHA-256: `1b0ea6f8b2e49a5286dd9d43643558117e898507ca8a35b0d4733aaca196ad77`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T13:19:45.134Z
- Document slug: `phmsa-interpretation-pi-73-027`

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