Question 1068 Deck General

The correct answer is C) set the relief valve. The reasoning is that setting the relief valve is not a required step in starting a centrifugal pump. The other steps - opening the suction and discharge valves, venting the pump casing, and checking the lubrication system - are all necessary to properly start up the pump and ensure it operates safely. However, setting the relief valve is not directly involved in the initial startup process. The other options (A, B, and D) are all standard steps that should be taken when starting a centrifugal pump to prepare it for operation and protect the system.