AWWA / NACE / AWS piping standards
Other American bodies: Water works, corrosion and welding standards. 7 standards most used in piping, flanges, fittings, valves and materials.
| Standard | Covers | Category | On this site |
|---|---|---|---|
| AWWA C200 | Steel water pipe, 6 inch and larger | Pipe | Open → |
| AWWA C207 | Steel pipe flanges for waterworks service | Flanges | Open → |
| AWWA C504 | Rubber-seated butterfly valves | Valves | – |
| NACE MR0175 / ISO 15156 | Materials for H₂S-containing environments in oil and gas production | Materials | Open → |
| NACE MR0103 / ISO 17945 | Materials resistant to sulphide stress cracking in refining | Materials | Open → |
| AWS D1.1 | Structural welding code — steel | Welding | – |
| AWS A5.x series | Filler metal specifications (e.g. A5.1 carbon steel electrodes, A5.4 stainless electrodes) | Welding | – |
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 AWWA / NACE / AWS standards cover piping?
AWWA C200 (steel water pipe); AWWA C207 (steel pipe flanges for waterworks service); AWWA C504 (rubber-seated butterfly valves); NACE MR0175 / ISO 15156 (materials for h₂s-containing environments in oil and gas production); NACE MR0103 / ISO 17945 (materials resistant to sulphide stress cracking in refining); AWS D1.1 (structural welding code — steel) and others listed on this page.
Last updated 2026-11-02