# Indiana Gas Company — Pipeline Safety Interpretation

**Citation:** PI-92-0104  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1992-06-29

PI-92-0104 response to Indiana Gas Company concerning 192.197.

## Document text

<<<PAGE 1>>>

PI-92-0104
June 29, 1992
Mr. Ronald J. Boes
Manager of Gas Systems
Standards & Procedures
Indiana Gas Company
1630 North Meridian Street
Indianapolis, IN 46202-1496
Dear Mr. Boes:
This responds to your letter of April 17, 1992, to Mr. Richard Sanders of the Transportation
Safety Institute in which you ask if the 3/8" external line on the Sprague CL34-2 IMR regulator is
a "static or control line" as set forth in Section 192.197.
The "static or control line" in Section 192.197(a)(6) is a line that runs from the regulator to the
downstream side of the regulator used to communicate that pressure to the regulator. The 3/8"
external tubing on the Sprague CL34-2 IMR is not a static or control line, but a supply line
supplying high pressure gas from the inlet side of the regulator to the pilot to establish the set
point; i.e., the outlet pressure of the regulator.
I trust that this has adequately responded to your question.
Sincerely,
Cesar De Leon
Director
Regulatory Programs
Office of Pipeline Safety

<<<PAGE 2>>>

Mr. Richard E. Sanders
Manager, Pipeline Safety Division
Transportation safety institute
6500 S. MacArthur Blvd.
Oklahoma City, OK 73125
Dear Mr. Sanders:
I am seeking information regarding the appropriateness of using the Sprague CL34-2IMR
(Internal Monitor) regulator on meter sets without any “other pressure limiting device”.
My deliemma is an interpretation of CFR 192.197(6). “A self-contained service regulator with
no external static or control lines” and a lack of definition of “external static or contol lines”.
The manufacturer of the CL34-2IMR insists, both in their printed literature and verbally, that
their unit complies with 192.197. However, the unit (picture attached) does have an external
line, 3/8” tubing that loads or controls the pilot regulator.
CFT 192.3 Definitions does not include a definition of “static or control lines’ nor can I locate
any other definition for control lines within CFR 192. 192.203 gives specific guidelines as to the
design of control lines without providing a definition. The “GPTC Guide of Gas Transmission
and Distribution Piping Systems” indicates “Control piping is pipe, hydraulically operated
control apparatus”.
If I accept the definition from the GPTC Guide, the regulator in question could not be used on a
meter set without some form of external relief. The manufacturer’s assertion, I believe, is based
on the assumption that “control line” refers to a connection downstream.
I would appreciate your opinion and /or any knowledge you might have on a past ruling or
interpretation by DOT that shed light on this subject.
Sincerely,
Ronald J. Boes
Manager of Gas System
Standards & Procedures
Indiana Gas Company,
Indianapolis, Indiana
(317) 321-0575

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1992/g92_06_29_BOES_192.197_nlmx.pdf>
- Source ID: `phmsa`
- SHA-256: `06245256806fd030bb2ca14caafa711c76fd09c1be034d41702552da0dbcf80d`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T11:00:28.423Z
- Document slug: `phmsa-interpretation-pi-92-0104`

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