Question 191General Subjects - 1st Asst/Chief

70% to pass

A spur gear pump should be operated with the discharge valves _______________.

Aslightly opened

Bthrottled

Chalfway opened

Dfully opened

AI Explanation

The correct answer is D) fully opened. A spur gear pump should be operated with the discharge valves fully opened to ensure the pump operates at its maximum efficiency and capacity. This is because fully opening the discharge valves allows the pump to move the maximum amount of fluid through the system, which is the primary function of the pump. Throttling or partially opening the discharge valves would restrict the flow, reducing the pump's performance and efficiency. The other options are incorrect because slightly opening, throttling, or only halfway opening the discharge valves would not allow the pump to operate at its full potential, which is the recommended practice for spur gear pumps.

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Official Resources

46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center

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