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29 CFR 1910.119(l)

Element 10: Management of Change

Every modification to your process — equipment, chemicals, procedures, or staffing — must go through formal review before implementation.

$4,000-$156,259
Penalty Range
Most Common
Citation Frequency
#2 Most Cited
PSM Ranking
Element Overview

What Is Management of Change Under PSM?

Management of Change is the element most directly responsible for preventing the incremental degradation of process safety over time. Every change to a covered process — to technology, equipment, operating procedures, or the facility — must be evaluated for its impact on safety before it is made. Section 1910.119(l) makes this a written, systematic requirement.

MOC requires a formal procedure that addresses the technical basis for the change, impact of change on safety and health, modifications to operating procedures, necessary time period for the change, and authorization requirements. Before any change is implemented, employees involved in operating and maintaining the process must be informed and trained.

The most dangerous violation of MOC is the change that gets made without any recognition that it is a change. Replacement in kind — swapping one piece of equipment for an identical one — is MOC-exempt. But what looks like replacement in kind often is not: different materials of construction, a pump with higher head, a valve with a different Cv rating. The failure to recognize a change as a change is where MOC programs most commonly collapse.

Regulatory Text

What the Standard Actually Requires

The employer shall establish and implement written procedures to manage changes (except for "replacements in kind") to process chemicals, technology, equipment, and procedures; and, changes to facilities that affect a covered process. The procedures shall assure that the following considerations are addressed prior to any change: the technical basis for the proposed change; impact of change on safety and health; modifications to operating procedures; necessary time period for the change; authorization requirements for the proposed change.— 29 CFR 1910.119(l)(1)-(l)(2)
  • 1
    Written MOC Procedure — Documented procedure for evaluating and authorizing all non-replacement-in-kind changes to process chemicals, technology, equipment, and procedures.
  • 2
    Pre-Change Evaluation — Technical basis, safety/health impact, procedure modifications, timeframe, and authorization must be addressed before the change is implemented.
  • 3
    Employee Notification and Training — Employees involved in operating and maintaining the process must be informed and trained on the change before it is implemented.
  • 4
    PSI and Procedure Updates — Process safety information and operating procedures must be updated to reflect the change.
  • 5
    Temporary Changes — Temporary changes must go through MOC and must have an authorized timeframe.
Compliance Failures

Common Violations OSHA Cites

These are the deficiencies inspectors most frequently document in Management of Change programs. Each can represent a separate citation.

Frequently Cited Violations

  • Changes made to process without any MOC review — particularly instrumentation, setpoints, and piping configuration changes
  • MOC completed after the change was implemented — retroactive documentation
  • Replacement in kind exemption applied incorrectly to a non-equivalent substitution
  • Temporary changes allowed to persist beyond authorized timeframe
  • Affected operators not trained on changes before returning to operation
  • PSI not updated following approved MOC

What Inspectors Look For

  • Field-walking the process with P&IDs to identify changes not documented in the MOC system
  • Reviewing the MOC log for temporary changes and checking whether any have expired
  • Asking operators about recent changes — if they are aware of changes not in the MOC log, that is a finding
  • Checking operator training records against MOC implementation dates
Real-World Impact

Consequences of Management of Change Failures

MOC failures are implicated in the majority of major PSM incidents. The 2005 BP Texas City explosion (15 killed) involved a level indicator replacement that introduced a design vulnerability not identified through MOC review. The 1988 Piper Alpha disaster (167 killed) was triggered by a removed pressure relief valve — a change made without adequate communication or documentation.

Penalty Exposure — Management of Change

OSHA penalty range for Management of Change violations: $4,000-$156,259 per violation. MOC citations are among the most serious in PSM enforcement because they represent systemic failures. Willful MOC violations carry penalties up to $15,625, and egregious willful violations can reach $156,259 per instance.

Documentation Requirements

Documents Your MOC Program Needs

An OSHA compliance inspection for Management of Change will typically request the following. Gaps in any of these areas may result in citations.

Required Documentation

  • Written MOC procedure with authorization matrix
  • MOC tracking log (open and closed)
  • Temporary change log with authorized durations
  • Training records for employees affected by MOCs
  • PSI update records tied to completed MOCs
  • Replacement-in-kind evaluation criteria and records
OSHA Letter of Interpretation

Related LOI Guidance

OSHA has clarified these specific questions about the Management of Change element through official Letters of Interpretation:

Do Organizational or Staffing Changes Require MOC? What Rules Govern Temporary Changes? Does Instrument Replacement Require MOC?

Get Management of Change Documents — Ready to Use

SafeGuard PSM provides OSHA-aligned Management of Change procedures, templates, and checklists that you can implement today. Written by PSM professionals. Formatted for actual field use.

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