{"data":{"id":"us/46-cfr-108.451","jurisdiction":"us","citation":"46 CFR 108.451","heading":"CO2 storage.","body":"(a) Except as provided in paragraph (b) of this section, each cylinder of a CO2 system must be outside each space protected by the system and in a location that would be accessible if a fire occurred in any space protected by the system.\n(b) A CO2 system that has a CO2 supply of 136 kilograms (300 pounds) or less may have one or more cylinders in the space protected by the system if the space has a heat detection system to activate the system automatically in addition to the remote and manual controls required by this subpart.\n(c) Each space that contains cylinders of a CO2 system must be ventilated and designed to prevent an ambient temperature of more than 54 °C. (130 °F.)\n(d) Each cylinder in a CO2 system must be securely fastened, supported, protected from damage, in an accessible location, and capable of removal from that location.\n(e) Each unit must have a means for weighing cylinders of a CO2 system.\n(f) A cylinder in a CO2 system may not be mounted in a position that is inclined more than 30° from a vertical position, except that a cylinder having flexible or bent siphon tubes may be mounted in a position that is inclined up to 80° from the vertical. The bottom of each cylinder when mounted must be at least 5 centimeters (2 inches) from the deck.\n(g) If a cylinder does not have a check valve on its independent cylinder discharge, it must have a plug or cap to close the outlet when the cylinder is moved.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER I-A—MOBILE OFFSHORE DRILLING UNITS","PART 108—DESIGN AND EQUIPMENT","Subpart D—Fire Extinguishing Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"80072a72df891044c8e078190575eea25720200bbdde693115ac0f1f60872d35","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-108.449","next":"us/46-cfr-108.453"},"notice":"GroundRules: Original legal text. Not legal advice."}