# Vents.

- **operation:** document
- **citation:** 49 CFR 193.2431
- **title:** Vents.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** Not available
- **effective on:** 1999-10-01
- **summary:** (a) Hazardous fluids may not be relieved into the atmosphere of a building or other confined space.

(b) Boiloff vents for hazardous fluids may not draw in air during operation.

(c) Venting of natural gas/vapor under operational control which could produce a hazardous gas atmosphere must be directe
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-193-2431.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-193-2431.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-193-2431
- **source url:** https://www.govinfo.gov/app/details/CFR-1999-title49-vol3/CFR-1999-title49-vol3-sec193-2431
**body:**

(a) Hazardous fluids may not be relieved into the atmosphere of a building or other confined space.

(b) Boiloff vents for hazardous fluids may not draw in air during operation.

(c) Venting of natural gas/vapor under operational control which could produce a hazardous gas atmosphere must be directed to a flare stack or heat exchanger in order to raise its temperature to achieve positive buoyancy and safe venting.

[45 FR 9203, Feb. 11, 1980, as amended by Amdt. 193-2, 45 FR 70404, Oct. 23, 1980]
- **truncated:** false
- **body characters:** 501