46 C.F.R. § 111.105-32 Bulk liquefied flammable gas and ammonia carriers.
Title 46 - Shipping
(a) Each vessel that carries bulk liquefied flammable gases or ammonia as a cargo, cargo residue, or vapor must meet the requirements of this section. (b) As used in this section: (1) The terms “gas-safe” and “gas-dangerous” spaces are used as defined in §154.7 of this chapter. (2) The term “gas-dangerous” does not include the weather deck of an ammonia carrier. (c) Each submerged cargo pump motor design must receive concept approval by the Commandant (G-MSE) and its installation must receive plan approval by the Commanding Officer, Marine Safety Center. (d) Electrical equipment must not be installed in a gas-dangerous space or zone, except: (1) Intrinsically safe electrical equipment and wiring, and (2) Other equipment as allowed in this section. (e) A submerged cargo pump motor, if installed in a cargo tank, must meet §111.105–31(d). (f) Electrical equipment must not be installed in a hold space that has a tank that is not required to have a secondary barrier under §154.459 of this chapter, except: (1) Through runs of marine shipboard cable; (2) Explosionproof lighting fixtures; (3) Depth sounding devices in gastight enclosures; (4) Log devices in gastight enclosures; (5) Impressed current cathodic protection system electrodes in gastight enclosures; and (6) Armored or MI type cable for a submerged cargo pump motor. (g) Electrical equipment must not be installed in a space that is separated by a gastight steel boundary from a hold space that has a tank that must have a secondary barrier under the requirements of §154.459 of this chapter, except: (1) Through runs of marine shipboard cable; (2) Explosionproof lighting fixtures; (3) Depth sounding devices in gastight enclosures; (4) Log devices in gastight enclosures; (5) Impressed current cathodic protection system electrodes in gastight enclosures; (6) Explosionproof motors that operate cargo system valves or ballast system valves; (7) Explosionproof bells for general alarm systems; and (8) Armored or MI type cable for a submerged cargo pump motor. (h) A cargo-handling room must not have any installed electrical equipment, except explosionproof lighting fixtures. (i) A space for cargo hose storage or a space that has cargo piping must not have any installed electrical equipment, except: (1) Explosionproof lighting fixtures; and (2) Through runs of marine shipboard cable. (j) A gas dangerous zone on the open deck must not have any installed electrical equipment, except: (1) Explosionproof equipment that is necessary for the operation of the vessel; and (2) Through runs of marine shipboard cable. (k) A space, except those named in paragraphs (f) through (i) of this section, that has a direct opening to gas-dangerous spaces or zones must have no electrical equipment except as allowed in the gas-dangerous space or zone. (l) Each gas-dangerous space that has lighting fixtures must have at least two branch circuits for lighting. (m) Each switch and each overcurrent protective device for any lighting circuit that is in a gas-dangerous space must open all conductors of the circuit simultaneously. (n) Each switch and each overcurrent protective device for lighting in a gas-dangerous space must be in a gas-safe space. [CGD 74–125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 77–069, 52 FR 31626, Aug. 21, 1987; CGD 94–108, 61 FR 28285, June 4, 1996; 62 FR 23909, May 1, 1997]
Title 46: Shipping
PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.105—Hazardous Locations
§ 111.105-32 Bulk liquefied flammable gas and ammonia carriers.
