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ASME B31.8S-2025

Managing System Integrity of Gas Pipelines
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ASME B31.8S-2025

Managing System Integrity of Gas Pipelines

PUBLISH DATE 2025
PAGES 84
ASME B31.8S-2025

Purpose and Scope of ASME B31.8S-2025

ASME B31.8S, Managing System Integrity of Gas Pipelines, is a supplementary standard to ASME B31.8. While B31.8 focuses on the initial design and construction of gas pipelines, B31.8S focuses on the long-term management and maintenance of those pipelines, particularly to prevent failures and incidents over time.

The core objective of the standard is to guide pipeline operators in developing and implementing an Integrity Management Program (IMP) that utilizes proven industry practices and processes. This standard applies to onshore gas pipeline systems constructed with ferrous materials.

The standard describes the following key elements for managing pipeline integrity:

  • Risk Assessment: Establishing a systematic process to assess the risk of a pipeline segment failing. This involves identifying and analyzing threats (e.g., external corrosion, third-party damage, cracking) and evaluating the potential consequences of failure.
  • Integrity Assessment: Defining the methods and schedules for assessing the physical condition of the pipe, such as using in-line inspection (ILI) tools ("smart pigs") or hydrostatic testing.
  • Remediation and Mitigation: Providing requirements for the immediate response to and repair of defects, as well as developing preventative and mitigative measures to reduce the likelihood and consequences of future incidents.
  • Data Integration: Establishing requirements for collecting, reviewing, and integrating data (such as pipeline history, defect data, and risk factors) to make informed integrity decisions.

Application and Use

ASME B31.8S is the foundation for the integrity management programs required by regulatory bodies, such as the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA). It is primarily used by:

  • Gas Pipeline Operators: They use the standard to structure their mandatory IMPs, moving beyond simple compliance to a performance-based safety strategy. It helps them prioritize their resources (inspections, repairs, and maintenance) to the segments of pipe that pose the highest risk.
  • Integrity Management Engineers: They follow B31.8S to determine assessment intervals, perform fitness-for-service evaluations, calculate the remaining strength of corroded pipe, and manage data quality.
  • Regulators: They use B31.8S as the technical reference for auditing and verifying that an operator’s integrity management program is comprehensive and effectively executed.

In essence, while B31.8 ensures pipelines are built safely, B31.8S ensures they operate safely throughout their useful lives by systematically managing threats and risks.

SDO ASME: American Society of Mechanical Engineers
Document Number B31.8S
Publication Date Aug. 22, 2025
Language en - English
Page Count
Revision Level
Supercedes
Committee
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