USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-73-008 ([Iowa Public Service Company] [Thomas Mitchell])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Iowa Public Service Company

Individual Name: Thomas Mitchell

Location State: IA Country: US

View the Interpretation Document

Response text:

February 13, 1973

Mr. Thomas Mitchell

Iowa Public Service Company

P.O. Box 778

Sioux City, Iowa 51101

Dear Mr. Mitchell:

This is in response to your telephone conversation with Mr. Cesar DeLeon of this office on
January 10, 1973, in which you ask us to verify by letter that §192.619(b) and §192.621(b) of
Title 49 of the Code of Federal Regulations provide for installation of overpressure protective
devices for gas systems that have a maximum operating pressure determined by the corrosion
history of the pipe segment. You indicated in your telephone conversation with Mr. DeLeon that
it appeared to you that these two sections were in conflict with §192.195 and §192.197 which do
not apply to installation of overpressure protective devices on systems built prior to March 12,
1971, or systems which were replaced, relocated, or otherwise changed prior to November 12,
1970, pursuant to §192.13, 49 CFR.

The requirements of §192.195 and §192.197 are contained in Subpart D of Part 192 which
prescribes minimum requirements for the design and installation of pipeline components and
facilities. Sections 192.619 and 192.621, on the other hand, are operational requirements
contained in Subpart L. Section 192.603(a) makes clear that no person may operate a segment of
pipeline unless it is operated in accordance with the requirements of Subpart L. Subpart L sets
forth the continuing requirements necessary to insure safe operation of a pipeline independent of
the initial design, installation and construction requirements that were applicable to that pipeline.
Sections 192.619(b) and 192.621(b) prescribe requirements for the operation of pipeline facilities
regardless of when these pipelines were installed. Therefore, you must comply with the
requirements of both of these sections in the operation of your gas facilities.

We trust that this has answered your particular question. If we can be of further service regarding
this matter, please let us know.


Joseph C. Caldwell


Office of Pipeline Safety

Regulation Sections

Section Subject
192.621 Maximum allowable operating pressure: High-pressure distribution systems