🔍 Key Concepts

• 46 CFR requirements for tank vessel cargo pumprooms carrying Grade C and D liquid cargoes • Why vapor control and ventilation are critical in cargo pumproom design • Differences between access from open deck, enclosed spaces, and mechanically ventilated spaces

💭 Think About

• Think about where flammable or combustible vapors are most likely to accumulate and how access location can reduce that risk • Consider which option best allows vapors to safely disperse if a leak occurs in the pumproom • Ask yourself: which type of access would the regulations avoid, because it could let cargo vapors spread into accommodation or machinery spaces?

✅ Before You Answer

• Verify which 46 CFR Part applies to tank vessels and cargo pumprooms • Check which locations are specifically restricted as entrances to cargo pumprooms due to ignition or gas-accumulation hazards • Confirm whether open deck access, interior access, or ventilated area access is emphasized in the regulations for Grade C and D cargoes