🔍 Key Concepts

• Trace the full flow path from the sea chest, through the pump, to the #6 centerline cargo tank valve (labeled 9). • Distinguish between suction-side valves (bringing water to the pump) and discharge-side valves (sending water from the pump to tanks or deck/overboard). • Identify all branch lines that would send flow to the wrong place (#6 port, #6 starboard, or deck headers) and need to be closed.

💭 Think About

• Starting at the sea chest, which specific valves must be open so water can reach the pump suction? Follow the numbered valves in order on that side. • From the pump discharge, follow the line that leads directly to valve 9 and the #6 center tank. Which valves lie in that direct path and therefore must be open? • Which numbered valves lead instead to the deck lines, #6 port, or #6 starboard tanks, and therefore must be closed if you want flow only to the #6 center tank?

✅ Before You Answer

• Verify that there is an unbroken open path from the sea chest, through the pump, through the manifold, to valve 9 only. • Confirm that all valves leading to alternate destinations (deck headers via valve 2/7, or #6 port via 8, or #6 starboard via 10) are closed. • Double-check that no valve is listed as both open and closed in the same answer choice, and that suction to the pump comes from the sea chest, not from any cargo line.