# Missouri Public Service Commission — Pipeline Safety Interpretation

**Citation:** PI-80-013  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1980-08-13

PI-80-013 response to Missouri Public Service Commission concerning 192.747.

## Document text

<<<PAGE 1>>>

August 13, 1980
Mr. B. J. Washburn, Manager
Electric and Gas Departments
Missouri Public Service Commission
P.O. Box 360
Jefferson City, Missouri 65102
Dear Mr. Washburn:
Thank you for your letter of June 3, 1980, in which you asked for an interpretation of Title 49 FR
192.747.
Enclosed is our interpretation of the specific questions you raised, i.e., are curb-cock valves
considered necessary for the safe operation of a distribution system and, if so, what effect if any
does the operating pressure of the service line or the presence or absence of other service line
valves outside of the building have on this determination.
If I may be of further help in this matter, please let me know.
Sincerely,
/signed/
Melvin A, Judah
Acting Associate Director for
Pipeline Safety Regulation
Materials Transportation Bureau
Enclosure
DB
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<<<PAGE 2>>>

No. 80-11
Date: August 13, 1980
DEPARTMENT OF TRANSPORTATION
RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION
MATERIALS TRANSPORTATION BUREAU
PIPELINE
_________________________________________________________________
SAFETY REGULATORY INTERPRETATION
NOTE:A
_________________________________________________________________
pipeline safety regulator interpretation applies a particular rule to a
particular set of facts and circumstances, and, as such, may be relied upon
only by those persons to whom the interpretation is specifically addressed.
SECTION: 192.747
SUBJECT: FACTS: Are curb-cock valves included in those valves which may be necessary for the safe
operation of a distribution system?
Section 192.747 requires that each valve, the use of which may be necessary for
the safe operation of a distribution system, must be checked and serviced at
intervals not exceeding one year.
The valves referred to in §192.747 are those necessary for the sectionalizing of the
distribution system so that an operator can isolate a particular section of the
distribution system in an emergency.
DB
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<<<PAGE 3>>>

The manual used by the Transportation Safety Institute (TSI) in conducting the
course on "Safety Regulation for Gas Pipeline Systems" states that valves for
sectionalizing should be considered at the following locations:
1. 2. 3. 4. Control(s) at each pressure regulation station.
Principal feed(s) to business districts and class 4 locations.
All single valves on mains within (2) above.
Valves that meet the following criteria.
Reasonable for a sectionalizing plan.
Consider - number of customers
- Volume of gas
- environment
- response time/valve accessibility
A curb-cock valve could only be used to isolate the service line in which it is
installed. It could not be considered as being capable of sectionalizing the
distribution system. Therefore, because of its limited capability, a curb-cock valve
would not be considered under §192.747 as being necessary for the safe operation
of a distribution system.
Since a curb-cock valve would not be considered necessary for the safe operation
of a distribution system, the operating pressure of the service line or the presence
or absence of other service line valves outside of the building would have no effect
on making a determination.
Melvin A. Judah
Acting Associate Director for
Pipeline Safety Regulation
Materials Transportation Bureau
DB
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3

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1980/PI80013.pdf>
- Source ID: `phmsa`
- SHA-256: `2fd494157a0eb9214a2d00e4507a3bf9b2cb26030a7edc8a6351299a85f84fc9`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T05:00:01.043Z
- Document slug: `phmsa-interpretation-pi-80-013`

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