What do regulations require that pumprooms on tank vessels carrying grade C liquid cargo with machinery spaces below the freeboard deck be ventilated with?
• 46 CFR requirements for tank vessel pumproom ventilation • Differences between natural ventilation and power (mechanical) ventilation on tankers • Special requirements when machinery spaces are below the freeboard deck for flammable/combustible cargoes
• Ask yourself: Is this cargo (grade C liquid) creating vapors that need active removal, or is passive venting usually enough? • Consider why having machinery spaces below the freeboard deck changes the fire/explosion risk in pumprooms. • Think about which option is specifically about ventilating an enclosed space (a room) versus venting tanks or pipes to atmosphere.
• Verify in 46 CFR which ventilation method is required for pumprooms, not for cargo tanks themselves. • Check which options describe tank venting systems versus room air-extraction systems. • Confirm that the selected option would continuously and positively remove flammable vapors from a confined space.
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