46 CFR § 111.106-13 - Cargo handling devices or cargo pump rooms handling flammable or combustible cargoes.
(b) Enclosed hazardous locations containing devices that handle cargoes must comply with Clauses 220.127.116.11 of API RP 500 and 18.104.22.168 of API RP 505 (incorporated by reference, see § 110.10-1). Ventilation must not be used to reduce the classification of such areas.
(c) Cargo pump rooms must be isolated from all sources of vapor ignition by gastight bulkheads. The gastight bulkhead between the pump room and the pump-motor compartment may be pierced by fixed lights, drive shafts, and pump-engine control rods, provided that the shafts and rods are fitted with fixed oil reservoir gland seals, or pressure grease seals where they pass through the gastight bulkheads. Other types of positive pressure seals must be specially approved by the Commandant (CG-ENG). Access to a cargo handling enclosed area or room must be from the open deck.
(d) Fixed lights in cargo pump rooms or enclosed cargo handling areas must meet the arrangement and construction requirements in § 111.105-31(g) of this part.
(e) A cargo handling area or pump room that precludes the lighting arrangement of paragraph (d) of this section, or where the lighting arrangement of paragraph (d) of this section does not give the required illumination level, must have explosion-proof, flameproof (Ex “d”) or flameproof-increased safety (Ex “de”) lighting fixtures.