# Maryland Public Service Commission — Pipeline Safety Interpretation

**Citation:** PI-72-039  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1972-09-13

PI-72-039 response to Maryland Public Service Commission concerning 192.457.

## Document text

<<<PAGE 1>>>

September 13, 1972
Mr. Charles C. Constantine
Executive Secretary
Maryland Public Service Commission
301 West Preston Street
Baltimore, Maryland 21201
Dear Mr. Constantine:
This is in response to your letter dated August 4, 1972, regarding the waiver granted to
Washington Gas Light Company and the Baltimore Gas and Electric Company from the
requirements of Section 192.59(a)(1), Section 192.457(b) and Section 192.465(e) of Title 49 of
the Code of Federal Regulations.
Regarding your questions concerning the status of the waiver after three years, the Office of
Pipeline Safety at that time will evaluate the reports on the results of this type of pipeline
rehabilitation. Based on those reports and all other available relevant information, we will then be
in a position to determine whether a renewal is justified. Because of the newness of the method
and the possibility of unforeseen results, it would be premature for this office now to assure that
the waiver will be renewed. However, if the method is successful, and, with other information,
supports a renewal of the waiver, this office will at that time consider amending the regulations to
permit its use.
We trust that this has answered your questions. If we can be of further assistance, please let us
know.
Sincerely,
Joseph C. Caldwell
Director
Office of Pipeline Safety
dal\192\457\72-09-13
1

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1972/PI72039.pdf>
- Source ID: `phmsa`
- SHA-256: `8f22024f1259068419516c673c23cf8286d3e70b730d18a47a1a0861c43b2479`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-24T22:51:15.219Z
- Document slug: `phmsa-interpretation-pi-72-039`

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