StacksVerified U.S. regulatory reference

49 CFR §192.751

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each operator shall take steps to minimize the danger of accidental ignition of gas in any structure or area where the presence of gas constitutes a hazard of fire or explosion, including the following:
  1. (a)When a hazardous amount of gas is being vented into open air, each potential source of ignition must be removed from the area and a fire extinguisher must be provided.
  2. (b)Gas or electric welding or cutting may not be performed on pipe or on pipe components that contain a combustible mixture of gas and air in the area of work.
  3. (c)Post warning signs, where appropriate.