The terminal indicates to you that they are going to use a booster pump to assist the discharging operation. You start the discharge, and in a few minutes the pressure drops sharply. This could be a result of which of the following?
• Cargo discharge pressure behavior when additional pumps come on line • Effect of a booster pump’s direction of flow on manifold pressure • Relationship between pump speed, flow rate, and pressure in a cargo discharge system
• When a booster pump starts and is correctly lined up, what normally happens to discharge pressure at the ship’s manifold? • If a pump is running but lined up to oppose or bypass the main flow, how would that affect the pressure you see on the gauges? • Would a pump that fails to start cause a sudden sharp change in pressure, or more of no change compared to what you first observed?
• Compare what a properly operating booster pump should do to both flow rate and pressure • Think about whether a wrong direction of flow could cause pressure to drop instead of rise • Ask yourself if a pump speeding up would ever reasonably cause a sharp pressure drop at the manifold
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