Question

2. (a) What is pump slippage of a gear pump? [3 points] (b) A gear pump performance data are shown in the following table for the oil of Specific Gravity 0.9. Barometric pressure 30.5 inch Hg, Specific weight of mercury = 133 KN/m³, Specific weight of water = 9.8 KN/m³ ,1 inch = 25.4 mm, 1 psi = 6895 Pa, 1 gpm = c.35 m³/s. RPM Suction pressure (inch Hg) Discharge pressure (psi) Time in seconds for Shaft power 1 gal of flow (watts) 200 -12.5 50 44 292 Calculate pump head in m, fluid power in watts, friction power loss, pump efficiency and net positive suction head if the inner diameter of the pipe is 0.5 inch. [7+5+2+2+8 points] (c) Explain the cause of cavitation in a gear pump. [3 points]

          2. (a) What is pump slippage of a gear pump?
[3 points]
(b) A gear pump performance data are shown in the following table for the oil
of Specific Gravity 0.9. Barometric pressure 30.5 inch Hg, Specific weight
of mercury = 133 KN/m³, Specific weight of water = 9.8 KN/m³ ,1 inch = 25.4
mm, 1 psi = 6895 Pa, 1 gpm = c.35 m³/s.
RPM Suction pressure (inch Hg)
Discharge
pressure (psi)
Time in seconds for Shaft power
1 gal of flow
(watts)
200
-12.5
50
44
292
Calculate pump head in m, fluid power in watts, friction power loss, pump
efficiency and net positive suction head if the inner diameter of the pipe is 0.5
inch.
[7+5+2+2+8 points]
(c) Explain the cause of cavitation in a gear pump.
[3 points]

2. (a) What is pump slippage of a gear pump?
[3 points]
(b) A gear pump performance data are shown in the following table for the oil
of Specific Gravity 0.9. Barometric pressure 30.5 inch Hg, Specific weight
of mercury = 133 KN/m³, Specific weight of water = 9.8 KN/m³ ,1 inch = 25.4
mm, 1 psi = 6895 Pa, 1 gpm = c.35 m³/s.
RPM Suction pressure (inch Hg)
Discharge
pressure (psi)
Time in seconds for Shaft power
1 gal of flow
(watts)
200
-12.5
50
44
292
Calculate pump head in m, fluid power in watts, friction power loss, pump
efficiency and net positive suction head if the inner diameter of the pipe is 0.5
inch.
[7+5+2+2+8 points]
(c) Explain the cause of cavitation in a gear pump.
[3 points]

Added by Lisa J.

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