Building Services Piping
Purpose of ASME B31.9-2025
ASME B31.9-2025, titled Building Services Piping, is a code developed and published by the American Society of Mechanical Engineers (ASME) as part of its broader B31 series on pressure piping. Its primary purpose is to establish minimum requirements for the safe design, materials selection, fabrication, assembly, erection, inspection, examination, and testing of piping systems used in building services applications. These systems typically operate at lower pressures and temperatures compared to those in industrial process or power piping (e.g., unlike ASME B31.1 for power plants or B31.3 for process facilities). The code aims to promote safety, reliability, and compliance with regulations while incorporating industry best practices to minimize risks such as leaks, failures, or inefficiencies in everyday building operations.
Typical Use
ASME B31.9-2025 is typically applied in the design, construction, and maintenance of piping systems within non-industrial buildings, including industrial, institutional, commercial, public, and multi-unit residential structures. Common applications include:
Engineers, contractors, and inspectors use the code during project phases to:
It serves as a companion to other ASME standards (e.g., in the A17 elevator series or A112 plumbing series) and is often referenced in building codes or project specifications to achieve cost-effective, safe installations. The 2025 edition includes updates such as revised allowable stresses, new material listings, and clarifications on examination requirements, reflecting ongoing advancements in materials and practices.
| SDO | ASME: American Society of Mechanical Engineers |
| Document Number | B31.9 |
| Publication Date | Sept. 1, 2025 |
| Language | en - English |
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