QUESTION 1 Problem-1: Estimate the number of pumps required to lift 0.05 m/s against a total head of 110 m if they arranged in series. The speed of the pump impeller N = 20EN rpm and the specific speed should not be less than 20. What are the diameter and power required for each pump if the speed ratio is 0.9 and the efficiency of the pump is 0.88? If each pump would be replaced with another geometrically similar pump working at the same efficiency with a diameter of D2 = 0.25 m and speed of N2 1250 rpm, what will be the new pump head, discharge and power? N, = NO H,: v=¢/2gHp P= PH;Q 757 3/4 = TDN/60;
QUESTION 1 Problem-1: Estimate the number of pumps required to lift 0.05 m/s against a total head of 110 m if they arranged in series. The speed of the pump impeller N = 20EN rpm and the specific speed should not be less than 20. What are the diameter and power required for each pump if the speed ratio is 0.9 and the efficiency of the pump is 0.88? If each pump would be replaced with another geometrically similar pump working at the same efficiency with a diameter of D2 = 0.25 m and speed of N2 1250 rpm, what will be the new pump head, discharge and power? N, = NO H,: v=¢/2gHp P= PH;Q 757 3/4 = TDN/60;
Chapter2: Loads On Structures
Section: Chapter Questions
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Transcribed Image Text:QUESTION 1
Problem-1: Estimate the number of pumps required to lift 0.05 m'/s against a total head of 110 m if they
arranged in series. The speed of the pump impeller N = 20EN rpm and the specific speed should not be
less than 20. What are the diameter and power required for each pump if the speed ratio is 0.9 and the
efficiency of the pump is 0.88?
If each pump would be replaced with another geometrically similar pump working at the same efficiency
with a diameter of D2 = 0.25 m and speed of N2=1250 rpm, what will be the new pump head, discharge
and power?
3/4
N, = NO/H,: v=0/2gH, = rDN / 60;
%3D
P.
757
D
D
N, D
N,
EN=62
P,
N.
H,
H
N,
D.
Problem-2:
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