ASME B31.8-2022 PDF

Full title and description

ASME B31.8-2022 — Gas Transmission and Distribution Piping Systems. This Code provides rules and guidance for the design, fabrication, assembly, erection, testing, inspection, operation and maintenance of gas transmission and distribution piping systems, including compressor and metering/regulation stations, mains, service lines to the customer meter set outlet, offshore gathering/transmission appurtenances, and closed‑pipe storage equipment and lines.

Abstract

ASME B31.8-2022 specifies safety‑focused engineering requirements for pipelines that transport gaseous fuels. The edition consolidates requirements for materials, welding, components, fabrication details, design and installation practices, testing and inspection procedures, corrosion control, operation and maintenance, and mandatory appendices relevant to gas transmission and distribution systems. This edition also introduces or revises sections addressing personnel training and qualification, damage prevention programs, and plastic piping design formulas.

General information

• Status: Superseded (replaced by ASME B31.8:2025; see Related standards).
• Publication date: December 22, 2022.
• Publisher: American Society of Mechanical Engineers (ASME).
• ICS / categories: Pipeline and piping; typical ICS mapping includes pipeline components and pipelines (example grouping: 23.040.01; fluid systems and components for general use). (Listed product categories vary by distributor.)
• Edition / version: 2022 edition (ASME B31.8-2022).
• Number of pages: 226 pages (typical published page count for the 2022 edition).

Scope

The Code applies to the design, construction, testing, inspection, operation and maintenance of gas transmission and distribution piping systems and related appurtenances. It covers onshore and offshore transmission and gathering pipelines (for transport from production to onshore facilities), compressor stations, metering and regulation stations, mains, service lines up to the customer's meter set outlet, and closed‑type gas storage pipe equipment and lines. It addresses only those safety aspects of vaporized liquefied petroleum gases that are handled as gaseous fuels and references applicable NFPA requirements where relevant.

Key topics and requirements

• Materials, specifications and permitted components for gas piping systems.
• Design rules: stress limits, design factors, MAOP considerations and class‑location effects.
• Welding, fabrication, fit‑up and assembly requirements (including updated fit‑up guidance for bends and elbows and flange assembly recommendations).
• Installation, hydrostatic and pneumatic testing, and inspection/examination practices.
• Corrosion control and cathodic protection guidance.
• Operation and maintenance procedures, abnormal operating condition (AOC) monitoring and decoupling AOCs from covered‑task qualifications.
• Integrity and damage prevention: provisions for damage prevention programs and operational integrity management practices.
• Plastic piping: revised plastic piping design formula and treatment of multilayered reinforced thermoplastic piping systems (MRTPS).
• Components and special items: pig trap design safety requirements, expanded approved valve specifications, and guidance for non‑pressurized pipe where applicable.

Typical use and users

Used by pipeline designers and engineers, construction and fabrication contractors, welding and inspection personnel, pipeline operators and maintenance crews, integrity and safety engineers, compliance and regulatory staff, and public‑safety authorities. The Code is a primary technical reference for project specifications, permitting, internal engineering standards, and training programs within utilities, pipeline operators and engineering consultancies.

Related standards

Commonly used alongside other ASME B31 series documents such as ASME B31.4 (liquid pipelines), ASME B31.3 (process piping) and ASME B31G (remaining strength of corroded pipelines), and with pertinent API and NFPA publications (for welding practice, pipeline testing, and LPG handling). The 2022 edition has since been succeeded by ASME B31.8:2025 (see status).

Keywords

ASME B31.8, gas transmission, gas distribution, pipelines, pipeline design, pipeline construction, pipeline inspection, corrosion control, pipe welding, MRTPS, damage prevention, integrity management, MAOP.

FAQ

Q: What is this standard?

A: ASME B31.8-2022 is the ASME Code for Gas Transmission and Distribution Piping Systems providing engineering and safety rules for the design, fabrication, installation, testing, inspection, operation and maintenance of gas pipelines and associated facilities.

Q: What does it cover?

A: It covers materials, design criteria, welding and fabrication, piping components and assembly details, testing and inspection, corrosion control, operation and maintenance procedures, and mandatory appendices related to gas transmission and distribution systems; the 2022 edition also added or revised sections on training/qualification, damage prevention, and plastic piping design formulas.

Q: Who typically uses it?

A: Pipeline and utility engineers, construction and fabrication contractors, inspection and testing personnel, integrity and safety teams, regulatory and compliance staff, and consultants involved in gas pipeline projects and operations.

Q: Is it current or superseded?

A: ASME B31.8-2022 was published on December 22, 2022 and has been superseded by ASME B31.8:2025 (the 2025 edition is the current active edition). Users should adopt the current 2025 edition for the latest requirements or confirm which edition is required by their contract or regulator.

Q: Is it part of a series?

A: Yes — B31.8 is part of the ASME B31 piping codes series (each B31 code covers a different piping domain such as B31.3 for process piping, B31.4 for liquid transportation, B31G for corroded pipeline strength methods, etc.).

Q: What are the key keywords?

A: Gas transmission, gas distribution, pipelines, MAOP, corrosion control, welding and fabrication, testing and inspection, integrity management, damage prevention, MRTPS, training and qualification.