30 CFR Part 56Public Domain
§ 56.4604 — Preparation of pipelines or containers
Subpart C — Fire Prevention and Control
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.
Public Domain: 30 CFR Part 56 (MSHA Safety and Health Standards — Surface Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.