# Memo: Internal — Pipeline Safety Interpretation

**Citation:** PI-94-034  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1994-10-24

PI-94-034 response to Memo: Internal concerning 192.605.

## Document text

<<<PAGE 1>>>

Memorandum
Date: October 24, 1994
Subject: INFORMATION: O&M manual regulations
From: Cesar De Leon, DPS-10
To: Richard Sanders, DTI-60
This responds to your memo of April 11, 1994, concerning the gas pipeline regulations in
49 CFR § 192.605.
Regarding § 192.605(a), you asked if it is the intent of this rule that all references to
design and construction be omitted from O&M manuals. Operators must include in their
manuals as much design and construction information, such as welding or other joining
procedures, as is necessary to carry out operation, maintenance, and emergency response
activities. For example, if a pipeline is to be repaired by replacing a segment of pipe, the
operator’ s O&M manual would have to have design and construction information
appropriate for that type of repair. Also, the O&M manual must contain procedures that
enable operating and maintenance personnel to obtain as much original design and
construction information as they need to carry out their assignments. However, such
original information may be maintained apart from the manual.
Regarding § 192.605(b)(5), you suggested we remove the phrase “ plus the build-up
allowed for operation of pressure limiting and control devices,” because it allows
operators to exceed the MAOP during start up and shut down of a pipeline. The purpose
of this rule is [sic] that start up and shut down of a pipeline does not cause unsafe
overpressuring. An unsafe overpressure occurs when pressure exceeds the build-up
allowed for operation of pressure limiting and control devices. We think the pressure
wording of § 192.605(b)(5) is clear in this regard and should not be changed.
#
dal/192.605
94-10-24

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1994/PI94034.pdf>
- Source ID: `phmsa`
- SHA-256: `48240673a30ed8b91b1013bd2a40a6b3a86fffec8010d710301cc81320b4237f`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T21:23:16.901Z
- Document slug: `phmsa-interpretation-pi-94-034`

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