46 C.F.R. § 154.904 Inert gas system: Controls.
Title 46 - Shipping
The inert gas system must have: (a) At least one check valve in the cargo area to prevent the back flow of cargo vapor into the inert gas system, or another means specially approved by the Commandant (G-MSO); (b) If the inert gas system is in the machinery space or another space outside the cargo area, a second check valve in the cargo area meeting paragraph (a) of this section; (c) Automatic and manual inert gas pressure controls; and (d) Valves to isolate each inerted space. [CGD 74–289, 44 FR 26009, May 3, 1979, as amended by CGD 82–063b, 48 FR 4782, Feb. 3, 1983]
Title 46: Shipping
PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES
Subpart C—Design, Construction and Equipment
Atmospheric Control in Cargo Containment Systems
§ 154.904 Inert gas system: Controls.
