ISO piping standards
International Organization for Standardization: International standards, many adopted as EN ISO, IS or GB/T. 9 standards most used in piping, flanges, fittings, valves and materials.
| Standard | Covers | Category | On this site |
|---|---|---|---|
| ISO 7-1 | Pipe threads where pressure-tight joints are made on the threads (BSPT / R, Rc) | Threads | Open → |
| ISO 228-1 | Pipe threads where pressure-tight joints are not made on the threads (BSPP / G) | Threads | Open → |
| ISO 3183 | Line pipe for pipeline transportation systems | Pipe | Open → |
| ISO 4200 | Plain-end steel tubes — dimensions and masses | Pipe | Open → |
| ISO 6708 | Definition of DN (nominal size) | Pipe | Open → |
| ISO 7005-1 | Steel flanges for industrial and general service piping | Flanges | Open → |
| ISO 9001 | Quality management systems — requirements | Quality | – |
| ISO 15156 | Materials for H₂S environments in oil and gas production (= NACE MR0175) | Materials | Open → |
| ISO 15590 | Induction bends, fittings and flanges for pipeline transportation | Fittings | Open → |
Subjects are short summaries, not official titles. Always buy the current edition from the issuing body; check which edition your project specification names.
Frequently asked questions
Which ISO standards cover piping?
ISO 7-1 (pipe threads where pressure-tight joints are made on the threads); ISO 228-1 (pipe threads where pressure-tight joints are not made on the threads); ISO 3183 (line pipe for pipeline transportation systems); ISO 4200 (plain-end steel tubes — dimensions and masses); ISO 6708 (definition of dn); ISO 7005-1 (steel flanges for industrial and general service piping) and others listed on this page.
Last updated 2026-11-02