API RP 754 Process Safety Performance Indicators for the Refining and Petrochemical Industries, Fourth Edition

About this publication

Product Description

API Recommended Practice 754, Process Safety Performance Indicators for the Refining and Petrochemical Industries, Fourth Edition, provides a common framework for measuring process safety performance through a structured system of leading and lagging indicators.

Published by the American Petroleum Institute in 2026, API RP 754 helps organizations identify significant process safety events, recognize precursor conditions, compare performance over time and use collected information to strengthen process safety management systems.

The Recommended Practice was developed primarily for the refining and petrochemical industries but can also be applied to other operating systems and processes where loss of containment has the potential to cause harm.

Fourth Edition — 2026

The Fourth Edition reflects approximately 15 years of industry experience implementing API RP 754 since the first edition was published in 2010.

API states that the 2026 revision strengthens the process safety indicator framework through updated event thresholds, improved treatment of fires, explosions and releases, clarified terminology, expanded data capture and more detailed examples.

Purpose of API RP 754

Process safety performance cannot be evaluated solely by counting major accidents. Serious incidents are relatively infrequent, and the absence of a major event does not necessarily demonstrate that process safety safeguards are functioning effectively.

API RP 754 therefore establishes a hierarchy of indicators intended to provide information about both events that have already occurred and conditions that can signal weakening safeguards before a major incident occurs.

Leading and Lagging Indicators

The Recommended Practice combines lagging indicators, which measure events and consequences that have already occurred, with leading indicators, which can identify weaknesses in process safety systems before those weaknesses contribute to a more serious event.

Used together, these indicators can help organizations detect patterns, understand recurring vulnerabilities, establish priorities and evaluate whether corrective actions are improving process safety performance.

Four-Tier Process Safety Indicator Framework

API RP 754 organizes process safety indicators into four tiers representing a continuum from major process safety consequences to increasingly proactive measures.

• Tier 1: Process safety events with the greatest consequences as defined by the Recommended Practice.
• Tier 2: Process safety events with lesser consequences than Tier 1 but that still meet defined reporting criteria.
• Tier 3: Events, conditions and challenges to safety systems that can provide information about weaknesses before a major process safety event occurs.
• Tier 4: Operating discipline and management-system performance indicators intended to measure activities that help maintain effective process safety barriers.

Tier 1 Process Safety Events

Tier 1 represents the most significant lagging process safety indicator category in the RP 754 framework. These events involve an unplanned or uncontrolled release from a process that meets one or more consequence criteria established by the Recommended Practice.

Tier 1 indicators are intended to provide a consistent method for tracking serious process safety events across companies and the industry.

Tier 2 Process Safety Events

Tier 2 captures process safety events that meet defined criteria but have consequences below the Tier 1 level. Tracking these events gives organizations a larger population of incidents from which trends and recurring vulnerabilities can be identified.

API identifies both Tier 1 and Tier 2 indicators as suitable for company and industry public reporting.

Tier 3 Indicators

Tier 3 indicators move further toward the leading side of the process safety spectrum. These measures can involve challenges to safety systems and other events that did not progress to a Tier 1 or Tier 2 process safety event but can provide information about the health of critical safeguards.

Because operating systems and risks differ among facilities, Tier 3 indicators are generally intended for internal use and can be selected or developed to match the site's particular process safety risks.

Tier 4 Indicators

Tier 4 represents the most leading portion of the four-tier framework. These indicators focus on operating discipline, management systems and activities intended to maintain effective process safety barriers.

Tier 4 measurements can help organizations evaluate whether important preventive activities are being completed and whether process safety management systems are functioning as intended.

Public Reporting and Internal Performance Management

API RP 754 distinguishes between indicators appropriate for broader industry reporting and those better suited to facility-level management.

Tier 1 and Tier 2 indicators are intended to provide sufficient consistency for company and industry reporting and benchmarking. Tier 3 and Tier 4 indicators are generally more facility-specific and are intended primarily to help individual sites understand and manage their process safety systems.

Loss of Primary Containment

Loss of primary containment is a central concept within API RP 754. Process safety events frequently begin with an unplanned or uncontrolled release of material from equipment or a process system.

The Recommended Practice provides a framework for evaluating releases and determining whether they meet applicable process safety event criteria.

Materials and Releases

The RP 754 framework is not limited only to traditional toxic or flammable chemicals. Depending on the circumstances and applicable criteria, process safety events can involve releases of materials or energy capable of causing harm.

The Fourth Edition provides refined guidance for evaluating material releases and determining their significance within the Tier 1 and Tier 2 indicator framework.

Unignited Material Releases

API identifies improved assessment of the relative hazard of unignited material releases as one of the major Fourth Edition changes.

An unignited release can still present significant process safety risk because the released material can create a flammable cloud, toxic exposure, environmental impact or other hazardous condition even when immediate ignition does not occur.

The 2026 revision improves the framework used to evaluate these events so that their process safety significance can be assessed more consistently.

Fires and Explosions

The Fourth Edition includes refined guidance for assessing fires and explosions. These events can represent serious process safety consequences even when the quantity released is difficult to measure directly.

API's revisions are intended to improve consistency in determining how fires and explosions should be classified and recorded within the RP 754 indicator system.

Updated Direct-Cost Thresholds

One of the specific changes in the 2026 Fourth Edition is an update to direct-cost thresholds used for Tier 1 and Tier 2 events.

API states that these thresholds were revised to account for inflation. Updating the values helps preserve the intended severity distinction between event categories as costs change over time.

Expanded Data Capture

The Fourth Edition expands the information organizations can capture when recording process safety events.

More detailed event data can support stronger trend analysis, benchmarking and identification of recurring causes or operating conditions. Expanded data can also help organizations distinguish between different types of releases and consequences when evaluating process safety performance.

Clarified Definitions

API identifies clarification of definitions as another major Fourth Edition improvement.

Consistent terminology is particularly important for performance indicators because company-to-company comparisons are meaningful only when organizations classify events according to comparable definitions and criteria.

More Detailed Examples

The 2026 edition expands practical examples intended to help users determine how the RP 754 criteria apply to real operating situations.

Examples can help organizations resolve borderline classifications and improve consistency among sites, companies and industry reporting programs.

Process Safety Event Classification

RP 754 provides a structured approach for deciding whether an event meets the definition of a process safety event and, where applicable, whether it qualifies as Tier 1 or Tier 2.

Classification considers the nature of the event, the material or energy released, consequences and applicable thresholds defined by the Recommended Practice.

Process Safety Performance Rates

Process safety indicator information can be normalized into rates so performance can be evaluated across different facilities, companies or reporting periods.

Normalization helps organizations compare performance while accounting for differences in operating scale or exposure and supports trend evaluation over time.

Benchmarking

One objective of standardized Tier 1 and Tier 2 definitions is to support meaningful benchmarking. When organizations use consistent definitions and reporting rules, company performance can be compared with broader industry data more reliably.

API uses RP 754 as the basis for its Annual Process Safety Event Survey, which collects process safety event information from participating organizations.

API Process Safety Site Assessment Program

API identifies RP 754 as a foundational standard for its Process Safety Site Assessment Program. The common indicator framework helps organizations and assessment teams evaluate process safety performance using consistent terminology and metrics.

Relationship to Process Safety Management

Performance indicators do not replace a process safety management system. Instead, they provide measurements that can indicate whether important safeguards, systems and practices are working as intended.

Organizations can use RP 754 data alongside hazard analyses, mechanical integrity programs, operating procedures, management of change, training, audits and incident investigations to improve overall process safety performance.

Early Warning and Prevention

A central concept behind the four-tier structure is that lower-consequence events and weaknesses in safety systems can provide warnings before a more serious incident occurs.

Monitoring leading indicators allows organizations to respond to deteriorating performance before the weakness contributes to a significant loss of containment, fire, explosion or other process safety event.

Learning From Events

Lagging indicators remain important because process safety events provide direct evidence of where safeguards or management systems did not prevent an undesirable outcome.

Trend analysis of Tier 1 and Tier 2 events can help organizations identify recurring equipment failures, operating conditions, process units or management-system weaknesses requiring further investigation.

Continuous Improvement

API RP 754 is intended to support continuous improvement rather than simple event counting. Organizations can establish performance indicators, collect consistent data, analyze trends, implement corrective actions and then determine whether performance improves.

This feedback cycle helps transform process safety metrics into management information that can support decisions about resources, engineering improvements and operating practices.

Indicator Selection

Tier 3 and Tier 4 indicators are not necessarily identical at every facility. Sites can select indicators that reflect the critical safeguards and process safety management activities most relevant to their particular hazards and operating systems.

Effective indicators should provide actionable information rather than generate data merely for reporting purposes.

Industry Development Background

API RP 754 was originally developed following recommendations from the U.S. Chemical Safety and Hazard Investigation Board after its investigation of the 2005 BP Texas City refinery incident.

The CSB recommended development of standardized process safety indicators suitable for public reporting as well as indicators that companies could use internally to monitor process safety performance.

First Edition — 2010

API published the first edition of RP 754 in 2010. The standard established the four-tier framework and created a common language for reporting and evaluating process safety performance across the refining and petrochemical industries.

Fourth Edition Development

API states that the Fourth Edition draws on experience accumulated through more than 15 years of implementation.

The standard has also been informed by international industry participation. API reports technical contributions from professionals in countries including the United States, Canada, United Kingdom, France, Saudi Arabia, United Arab Emirates, India, Malaysia and Uruguay.

International Use

Although RP 754 was developed primarily for refining and petrochemical operations, API reports that the standard has been adopted and used internationally.

Other industry organizations, including the International Association of Oil & Gas Producers and the Center for Chemical Process Safety, reference the RP 754 process safety performance framework in related guidance.

Applicability Beyond Refining and Petrochemicals

API states that the Recommended Practice can also be applicable to other industries and operating systems where loss of containment has the potential to cause harm.

Its applicability is not limited solely to facilities subject to the U.S. OSHA Process Safety Management Standard or similar regulatory programs.

OSHA Process Safety Management

API RP 754 can complement process safety management programs at facilities subject to OSHA 29 CFR 1910.119, but the Recommended Practice does not replace regulatory requirements.

Companies remain responsible for determining and complying with the laws and regulations applicable to their facilities.

Process Safety Versus Personal Safety

Process safety indicators address hazards associated with releases of hazardous materials and energy from process systems. These risks differ from traditional occupational injury measures such as slips, trips or routine personal-safety incidents.

Organizations therefore benefit from measuring process safety performance separately rather than assuming that low occupational injury rates necessarily demonstrate strong process safety performance.

Hazardous Material Releases

Major process safety events can involve hazardous material releases capable of affecting workers, nearby communities, the environment and facility operations.

RP 754 creates a consistent system for recording and analyzing these events so organizations can identify recurring patterns and strengthen safeguards.

Fires and Explosion Risk

Loss of containment can create fire and explosion hazards when released materials are flammable or reactive. API specifically identifies reduction of risks from hazardous material releases, fires and explosions as a core objective of the Fourth Edition framework.

Community and Environmental Impact

Process safety events can extend beyond facility boundaries. Significant releases can affect surrounding communities and the environment as well as employees and equipment within the plant.

Tracking significant events and precursor indicators can therefore support broader risk-reduction and operational-integrity objectives.

Operational Reliability

Process safety and operational reliability are closely related. Equipment failures, control-system problems and operating-discipline weaknesses that contribute to process safety events can also interrupt production and damage assets.

Indicator analysis can help organizations identify weaknesses that affect both safety and reliable operation.

Data Quality and Consistency

A performance indicator system is only useful when organizations collect and classify information consistently. RP 754 provides common definitions and criteria intended to reduce differences in how facilities classify similar events.

The Fourth Edition's clarified definitions and additional examples are intended to further improve this consistency.

Process Safety Leadership

Performance indicators provide managers with information needed to evaluate the condition of process safety systems. Leading indicators can reveal whether important preventive activities are being performed, while lagging indicators show where failures or loss-of-containment events have already occurred.

Used together, the four tiers can support management review and decisions concerning engineering improvements, maintenance, training and organizational priorities.

Worker Participation

Personnel who operate, inspect and maintain process equipment frequently have direct knowledge of abnormal conditions and safeguard performance. Effective indicator systems can use information from operations, maintenance and other site functions to identify recurring problems and opportunities for improvement.

Trend Analysis

Individual incidents can provide important lessons, but a larger set of standardized data can reveal patterns that are difficult to identify from isolated events.

Organizations can evaluate indicators by process unit, event type, consequence, time period or other relevant characteristics to identify areas requiring additional attention.

Performance Review

RP 754 indicators can be incorporated into routine site, corporate or management reviews. Regular review helps ensure that reported metrics lead to corrective action rather than becoming passive statistics.

Who Should Use API RP 754

• refinery process safety professionals;
• petrochemical facility managers;
• process safety engineers;
• chemical and process engineers;
• operations managers and supervisors;
• mechanical integrity and reliability personnel;
• environmental, health and safety professionals;
• risk management personnel;
• incident investigation teams;
• corporate process safety organizations;
• facility leadership and management teams;
• auditors and process safety assessment personnel;
• companies participating in process safety benchmarking;
• organizations developing leading and lagging safety metrics.

Why API RP 754 Matters

Major process safety events are uncommon compared with routine operating activities, but their consequences can be severe. Measuring only major incidents provides too little information to understand whether safeguards are gradually weakening.

API RP 754 addresses this limitation through a four-tier system that connects serious consequences with lower-consequence events, challenges to safeguards and proactive management-system indicators.

The Fourth Edition strengthens that framework using more than 15 years of implementation experience and provides updated criteria intended to improve consistency, hazard assessment and learning across the refining and petrochemical industries.

Major Fourth Edition Updates

• updated Tier 1 and Tier 2 direct-cost thresholds to reflect inflation;
• refined guidance for evaluating fires;
• refined guidance for evaluating explosions;
• improved assessment of unignited material releases;
• improved evaluation of the relative hazard of unignited releases;
• clarified process safety definitions;
• expanded data capture;
• more detailed practical examples;
• continued four-tier leading and lagging indicator framework;
• incorporation of more than 15 years of industry implementation experience.

Product Features

• Fourth Edition of API RP 754
• Published August 2026
• ANSI/API Recommended Practice
• 147 pages
• Current edition
• Establishes four tiers of process safety performance indicators
• Covers leading and lagging process safety metrics
• Tier 1 and Tier 2 suitable for company and industry public reporting
• Tier 3 and Tier 4 intended primarily for internal facility use
• Addresses process safety event classification
• Addresses loss-of-primary-containment events
• Includes updated direct-cost thresholds
• Includes revised fire and explosion guidance
• Improves evaluation of unignited releases
• Clarifies definitions and classifications
• Expands event data capture
• Provides additional examples for implementation
• Supports process safety benchmarking and trend analysis
• Supports API process safety assessment and annual event-survey programs
• Applicable beyond refining where loss of containment can cause harm

Product Details

• Standard: ANSI/API RP 754
• Title: Process Safety Performance Indicators for the Refining and Petrochemical Industries
• Edition: Fourth Edition
• Publisher: American Petroleum Institute
• Publication: August 2026
• Page Count: 147
• API Product Number: C75404
• ANSI Status: ANSI Approved
• Previous Edition: API RP 754, Third Edition, August 2021
• Language: English
• Publication Type: Recommended Practice

Edition Status Note

API RP 754, Fourth Edition, is the current edition as of October 2026 and supersedes the Third Edition published in August 2021. API announced publication of the Fourth Edition on August 6, 2026. The revision retains the four-tier process safety indicator framework while incorporating updated thresholds, revised event-assessment guidance, expanded data capture, clarified definitions and additional examples based on more than 15 years of implementation experience.