{"data":{"id":"us/30-cfr-56.13021","jurisdiction":"us","citation":"30 CFR 56.13021","heading":"High-pressure hose connections.","body":"Except where automatic shutoff valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high-pressure hose lines of 3/4-inch inside diameter or larger, and between high-pressure hose lines of 3/4-inch inside diameter or larger, where a connection failure would create a hazard.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES","Subpart L—Compressed Air and Boilers"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"0f9116178c8850a6d64d7afde3cb5515e6283d66f67c2cba17d912ee3e8046ef","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-56.13020","next":"us/30-cfr-56.13030"},"notice":"GroundRules: Original legal text. Not legal advice."}