🔍 Key Concepts

• Study the flow paths and valve symbols between the main circulating sea water system and the auxiliary circulating sea water system on drawing SP-SW-01. • Pay close attention to any cross‑connect lines and whether they have stop valves that can be opened to allow flow in either direction. • Remember that flow capability depends on both piping connections and pump suction/discharge locations, not just that lines touch on the drawing.

💭 Think About

• Starting at the main circulating pump discharge, can you trace an openable path (through valves) that would let that flow reach the auxiliary sea water coolers? • Starting at the auxiliary circulating pump discharge, can you trace an openable path that would let that flow reach the main condenser or main circulating headers? • Are there any parts of the system that appear to be one‑way only because of check valves or pump orientation, even if the piping is cross‑connected?

✅ Before You Answer

• Verify which valves must be opened or closed to connect the main circ discharge header to the auxiliary sea water header, and whether any check valves would block reverse flow. • Verify whether the auxiliary circulating pump suction can be supplied from the same sea chest/header as the main circulating pumps or only from the service system header. • Confirm if any cross‑connect shown ties into the suction side only, the discharge side only, or both—this will determine whether assistance is possible in one direction, both directions, or not at all.