Calculate Motor Pump Size

• Calculate Size of Pump having following Details
• Static Suction Head(h2)=0 Meter
• Static Discharge Head (h1)=50 Meter.
• Required Amount of Water (Q1)=300 Liter/Min.
• Density of Liquid (D) =1000 Kg/M3
• Pump Efficiency (pe)=80%
• Motor Efficiency(me)= 90%
• Friction Losses in Pipes (f)=30%

Calculations:

• Flow Rate (Q) =Q1x1.66/100000 =300×1.66/100000= 0.005 M3/Sec
• Actual Total Head (After Friction Losses) (H) = (h1+h2)+((h1+h2)xf)
• Actual Total Head (After Friction Losses) (H)=50+(50×30%)= 65 Meter.
• Pump Hydraulic Power (ph) = (D x Q x H x9.87)/1000
• Pump Hydraulic Power (ph) = (1000 x 0.005 x 65 x9.87)/1000 =3KW
• Motor/ Pump Shaft Power (ps)= ph / pe = 3 / 80% = 4KW
• Required Motor Size: ps / me =4 / 90% = 4.5 KW

• Required Size of Motor Pump = 4.5 HP or 6 HP