In order to take suction on the lube oil drain tank cofferdam with the bilge pump shown in the illustration, how many suction side valves must be open? GS-0042

Correct Answer: Option B — Two

Bilge pump suction manifolds typically require the opening of two valves to establish a flow path: the specific tank suction valve and the main manifold suction valve. This configuration prevents cross-contamination and ensures the pump draws exclusively from the intended cofferdam, adhering to standard marine piping system safety protocols.