Question

The
rotation speed of a centrifugal water pump is 1500 rpm, its flow
rate is 15 L / s, the rotor diameter is 0.2 m at the outlet, the
rotor width at the outlet is 0.01 m and the mechanical efficiency
is 0.92. For the fluid entering the rotor in the axial direction,
the wing angle is given as 30o at the outlet. What power should be
given to the shaft of this pump? (ρwater = 1000 kg / m3)

Answer #1

A centrifugal pump delivers water against a net head of 14 m
and a speed of 1300 rpm. The blade angle is given as 35º. The
impeller outlet diameter is 225 mm and outlet width is 50 mm.
Determine the discharge of the pump if manometric efficiency is
83%.

A centrifugal pump has an impeller of outer diameter, 20 cm and
outer width,4 cm.
The pump delivers a flow of 30 L/s against a head of 10.5 m at
an operating speed
of 550 rpm. If the hydraulic efficiency of the pump is 85% and
the overall efficiency
is 80%, determine the impeller outlet vane angle and the power
required to run the
pump.

Q1/ Centrifugal pump runs at (1200 r.p.m) and the velocity of
flow through the impeller is constant (4 m/s). It works with total
head of (32m). The vanes are set back at an angle of (30°) at
outlet .The outer diameter of the impeller is (600 mm) while the
width of outlet is (50mm). Determine 1) work done per second by
impeller 2) Vane angle at inlet 3)discharge 4)efficiency

A pump is pumping water at a flow rate of Q = 125 Liter per
minute against a head of 18 meters. Assuming the mechanical
efficiency of 85 %, what is the shaft power of the pump required
for the pump in Watts? Assume water density at 1000
kg/m3 and gravitational acceleration g = 9.81
m/s2.

The characteristics of a centrifugal pump that is used to pump
water (998 kgm-3 , 1.14×10-3 Nsm-2 ) from one reservoir to another
are given in the table below. The difference between the water
levels is 3 m. A 840 m long, 0.15 m diameter pipe with absolute
roughness of 6×10-6 m joins the two reservoir.
Determine the (a) best efficiency point, (b) operating point,
(c) operating efficiency and the (d) power adsorbed when the
average velocity in the pipe...

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