30 C.F.R. § 57.4604 Preparation of pipelines or containers.
Title 30 - Mineral Resources
Before welding, cutting, or applying heat with an open flame to pipelines or containers that have contained flammable or combustible liquids, flammable gases, or explosive solids, the pipelines or containers shall be— (a) Drained, ventilated, and thoroughly cleaned of any residue; (b) Vented to prevent pressure build-up during the application of heat; and (c)(1) Filled with an inert gas or water, where compatible; or (2) Determined to be free of flammable gases by a flammable gas detection device prior to and at frequent intervals during the application of heat.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart C—Fire Prevention and Control
Welding/Cutting/Compressed Gases
§ 57.4604 Preparation of pipelines or containers.
