46 CFR § 182.710 - Piping for vital systems.
(a) Vital systems are those systems that are vital to a vessel's survivability and safety. For the purpose of this part the following are vital systems:
(1) Fuel system;
(2) Fire main;
(3) Carbon dioxide, Halon 1301, and clean agent systems;
(4) Bilge system;
(5) Steering system;
(6) Propulsion system and its necessary auxiliaries and controls;
(7) Ship's service and emergency electrical generation system and its necessary auxiliaries; and
(b) For the purpose of this part, a system not identified in paragraph (a) of this section is a non-vital system.
(c) Piping used in a vital system must:
(1) Be composed of ferrous materials except when:
(i) Nonmetallic piping materials are permitted by § 182.720; or
(ii) Nonferrous metallic piping materials are permitted by § 182.730; and
(2) If subject to a pressure of more than 1,034 kPa (150 psig), be designed, fabricated, and inspected in accordance with the principles of ANSI B 31.1 (incorporated by reference; see 46 CFR 175.600) or other standard specified by the Commandant.
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