# Purging.

- **operation:** document
- **citation:** 49 CFR 193.2517
- **title:** Purging.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** When necessary for safety, components that could accumulate significant amounts of combustible mixtures must be purged in accordance with a procedure which meets the provisions of the “Purging Principles and Practices (incorporated by reference, see § 193.2013)” after being taken out of service and 
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-193-2517.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-193-2517.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-193-2517
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-193.2517
**body:**

When necessary for safety, components that could accumulate significant amounts of combustible mixtures must be purged in accordance with a procedure which meets the provisions of the “Purging Principles and Practices (incorporated by reference, see § 193.2013)” after being taken out of service and before being returned to service.

[Amdt. 193-2, 45 FR 70405, Oct. 23, 1980, as amended by Amdt. 193-25, 80 FR 183, Jan. 5, 2015]
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- **body characters:** 429