[Code of Federal Regulations] [Title 46, Volume 7] [Revised as of October 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR197.452] [Page 435] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PART 197--GENERAL PROVISIONS--Table of Contents Subpart B--Commercial Diving Operations Sec. 197.452 Oxygen cleaning. The diving supervisor shall ensure that equipment used with oxygen or oxygen mixtures greater than 40 percent by volume is cleaned of flammable materials-- (a) Before being placed into service; and (b) After any repair, alteration, modification, or suspected contamination.