U.S. regulations require cargo pump rooms, on tank vessels handling grades A, B, or C liquid cargo, shall be equipped with power ventilation of the exhaust type. in what amount of time should the ventilation effect a complete change of air?
ā¢ 46 CFR requirements for tank vessels carrying flammable and combustible liquids ā¢ Purpose of power ventilation of the exhaust type in cargo pump rooms ā¢ Typical regulatory time limits for air changes in hazardous spaces
ā¢ Is the cargo pump room considered a space with high risk of vapor accumulation and explosion? How quickly would vapors need to be removed to keep it safe? ā¢ Compare the answer choices: which times seem unrealistically short for a full air change in a large space, and which seem too slow for an emergencyārisk area? ā¢ Think about similar requirements for hazardous enclosed spaces on tank vesselsāwhat order of magnitude (around 1 minute, a few minutes, or several minutes) is commonly used in regulations?
ā¢ Verify in 46 CFR the specific section on cargo pump room ventilation for tank vessels with Grades A, B, or C cargoes ā¢ Check whether the regulation says "not more than" a certain number of minutes for one complete air change ā¢ Confirm that the required time is consistent with other hazardousāarea ventilation standards on tank vessels (not excessively short or overly long)
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