Where should cargo tanks not be located during transfer of Class 1-3 liquids?

Where should cargo tanks not be located during transfer of Class 1-3 liquids?

• A. Outdoors
• B. Indoors
• C. Inside Tank
• D. In Passage

Answer: (B)

Vapors from Class 1–3 liquids must be kept from accumulating in confined spaces. The main idea here is that ventilation and vapor dispersion are crucial during these transfers. An indoor, enclosed area can trap flammable vapors, allowing them to reach ignition concentrations and ignite from a spark, hot surface, or static discharge. That’s why transfers are done outdoors or in well-ventilated areas where vapors can dissipate quickly and emergency response can be more effective. Placing cargo tanks indoors would create a confined space where vapors linger, dramatically increasing the fire or explosion risk.

Vapors from Class 1–3 liquids must be kept from accumulating in confined spaces. The main idea here is that ventilation and vapor dispersion are crucial during these transfers. An indoor, enclosed area can trap flammable vapors, allowing them to reach ignition concentrations and ignite from a spark, hot surface, or static discharge. That’s why transfers are done outdoors or in well-ventilated areas where vapors can dissipate quickly and emergency response can be more effective. Placing cargo tanks indoors would create a confined space where vapors linger, dramatically increasing the fire or explosion risk.