🔍 Key Concepts

• Grade D liquids and their fire risk compared with more volatile grades • How sources of ignition must be separated from cargo spaces on tank vessels • The purpose and definition of a cofferdam versus a bulkhead or ordinary space

💭 Think About

• Think about which option is specifically designed to provide a safety barrier between a hazardous space and a space that might contain ignition sources. • Ask yourself: which of these choices does the Coast Guard recognize as a buffer space (often empty or used only for non-hazardous service) between cargo tanks and machinery or accommodation spaces? • Consider whether simply having a wall (bulkhead) or an occupied space next to a cargo pump room truly removes or just relocates the ignition hazard.

✅ Before You Answer

• Verify which option is defined in regulations as a separate, empty or protected space used specifically for segregation and fire/safety protection. • Check that the correct choice does not itself normally contain ignition sources or regular occupancy. • Confirm in tank vessel construction rules that the same method is used to separate cargo tanks from machinery or accommodation spaces; the same concept applies to pump isolation.