# Valves; qualification for sour gas

- **operation:** document
- **citation:** Mich. Admin. Code R 460.20405
- **title:** Valves; qualification for sour gas
- **source type:** regulation
- **agency:** Michigan Public Service Commission
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-05-04
- **summary:** Rule 405. An operator shall ensure that valves that are used for sour gas service are qualified for sour gas service in accordance with the National Association of Corrosion Engineers international standard MR-175/ISO 15156, which is adopted by reference in R 460.20605. History: 1998-2000 AACS; 2003
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/mi-admin-code-r-460-20405.json
- **markdown:** https://regulus.evalyn.ai/document/mi-admin-code-r-460-20405.md
- **app url:** https://regulus.evalyn.ai/document/mi-admin-code-r-460-20405
- **source url:** https://ars.apps.lara.state.mi.us/AdminCode/DownloadAdminCodeFile?FileName=R%20460.20101%20to%20R%20460.20606.pdf
**body:**

Rule 405. An operator shall ensure that valves that are used for sour gas service are qualified for sour gas service in accordance with the National Association of Corrosion Engineers international standard MR-175/ISO 15156, which is adopted by reference in R 460.20605.

History: 1998-2000 AACS; 2003 AACS; 2009 AACS; 2010 AACS; 2022 AACS.
- **truncated:** false
- **body characters:** 340