Refer to the drawing of a radial-flow centrifugal pump with a recirculation line in an open system (see figure below).
The recirculation line throttle valve is currently 50 percent open.
The pump is currently operating very close to runout.
To move pump operation farther away from runout, without reducing the pump’s available net positive suction head, an orifice can be installed at point _____; or the pump’s recirculation line throttle valve can be positioned more __________.
A. X; open
B. X; closed
C. Y; open
D. Y; closed
Show Answer
Answer: D
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