Match the specific fluid commodity to the correct code (B31.4 vs. B31.8).
Developed to address the global shift toward clean energy, this code covers piping in gaseous and liquid hydrogen service. It accounts for hydrogen embrittlement by mandating specific material selection, lower design stress factors, and specialized welding qualifications. Key Technical Aspects Covered in the Standards
The B31 Code for Pressure Piping is the foundational series. It is a collection of standards established by the American Society of Mechanical Engineers (ASME) that covers the design, inspection, fabrication, and testing of piping systems across industries . The most important of these for pipelines are the following.
Tracks where state laws are even stricter than federal standards.
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: Defines the material specifications, matching standard requirements with cross-industry groups like ASTM International. 4. Modern Engineering Challenges and Code Evolution
When Mira joined the Standards Office she expected rules and footnotes. What she found, however, was a living map: pages and clauses that traced how steel should bend and how pressure should be trusted — not blindly, but with care.
: Transportation of Hazardous Liquids by Pipeline.
The American Society of Mechanical Engineers (ASME) publishes the world's most critical engineering standards for pressure piping. For pipeline engineers, operators, and safety inspectors, navigating these vast documents is a daily necessity. This comprehensive guide serves as an unofficial compendium of the essential ASME pipeline standards, detailing their specific scopes, technical applications, and industry-wide compliance mandates. Introduction to ASME Pipeline Standards Match the specific fluid commodity to the correct code (B31
| Parameter | B31.4 (Liquid) | B31.8 (Gas) | B31.12 (H2) | | :--- | :--- | :--- | :--- | | Design factor (Class 1) | 0.72 | 0.72 | 0.5 (Tier 1) | | Hydrostatic test factor | 1.25 x MAOP | 1.25 x MAOP (Class 1) | 1.25 x MAOP | | Min. valve spacing | 15 miles | 7.5 miles (Class 1) | 10 miles | | Material impact test temp | -30°F | -20°F (typical) | -50°F |
A vital supplement dedicated entirely to Managing System Integrity of Gas Pipelines . It outlines the industry standard for risk assessment and threat prevention (e.g., stress corrosion cracking and third-party damage). ASME B31.3: Process Piping
For those specifically working with U.S. federal regulations, is an indispensable tool. It acts as a direct bridge between the regulatory language of the CFR and the technical requirements of the ASME codes. It is intended to aid users, but it should not be considered a substitution for the application of sound engineering judgment . It is best viewed as the definitive guide for regulatory compliance, explaining exactly which ASME standard applies to a given regulatory citation for gas and hazardous liquid pipelines.
= Design Factor (determined by location class or fluid type) = Longitudinal Joint Factor = Temperature Derating Factor Phase 2: Construction and Inspection It accounts for hydrogen embrittlement by mandating specific
Is this article intended for , field operators , or compliance managers ?
Published as a companion to B31.8, this standard is dedicated entirely to Pipeline Integrity Management (PIM).
Purchase the latest editions from ASME (https://www.asme.org). As of 2025, the active editions are:
The B31 series establishes the foundational safety and design criteria for pressure piping systems. Two specific sections dictate the vast majority of pipeline engineering.