CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH (parts 56 to 58) > PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES > SUBPART C—Fire Prevention and Control (§56.4000 to §56.4604) > 56.4603—Closure of valves.

56.4603—Closure of valves.

To prevent accidental release of gases from hoses and torches attached to oxygen and acetylene cylinders or to manifold systems, cylinder or manifold system valves shall be closed when—
(a) The cylinders are moved;
(b) The torch and hoses are left unattended; or
(c) The task or series of tasks is completed.