Environmental Engineering - II (Sessional)

1. Department of CEN, PCIU
Engineering Materials Sessional
CEN 200
Determination of pump capacity
Md. Mehedi Hassan Masum
Lecturer
Department of Civil Engineering
Port City International University

2. 2
Introduction Result & Discussion Conclusion
Pump
Capacity
Department of CEN, PCIU

3. 3
Introduction Result & Discussion Conclusion
Well Design
𝐹𝑙𝑜𝑜𝑑𝑒𝑑 𝑆𝑢𝑐𝑡𝑖𝑜𝑛 𝐻𝑒𝑎𝑑 𝐿𝑖𝑓𝑡 𝑆𝑢𝑐𝑡𝑖𝑜𝑛 𝐻𝑒𝑎𝑑
Department of CEN, PCIU
440 ft
100 ft

4. 4
Introduction Result & Discussion Conclusion
Head
Head describes hydraulic energy, expressed as the
height of a column of liquid above a datum.
For lift suction head,
Static Head (𝐻𝑠𝑡𝑎𝑡) = 𝑆𝑡𝑎𝑡𝑖𝑐 𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝐻𝑒𝑎𝑑 𝐻 𝐷 +
𝑆𝑡𝑎𝑡𝑖𝑐 𝑆𝑢𝑐𝑡𝑖𝑜𝑛 𝐻𝑒𝑎𝑑 (𝐻𝑠)
Department of CEN, PCIU

5. 5
Introduction Result & Discussion Conclusion
Data Used
Discharge, Q= 800 l/day @ 4 times
=
800
1000
𝑚3
𝑑𝑎𝑦
Diameter of the well = 4” = (4/12)’=0.333’
=(0.333/3.28)
=0.1016m
l = 100 ft (assume)
f =0.01
Velocity, V = Q/A
=
800x10−3x4
60x3.14x0.10162
=1.645 m/s
=5.396 ft/s
Head Calculation
Department of CEN, PCIU

6. 6
Introduction Result & Discussion Conclusion
Head loss due to friction, ℎ 𝑓 =
4flv2
2gd
=
4𝑥0.01𝑥100𝑥5.3962
2𝑥32.2𝑥0.33
=5.43 ft
Head Calculation
Department of CEN, PCIU

7. 7
Introduction Result & Discussion Conclusion
Head loss due to velocity , ℎ 𝑣 =
𝑣2
2𝑔
=
5.432
2𝑥32.2
=0.4578 ft
Now, H=hf + hv+ static suction head+ static
discharge head+ minor loss
=5.43+.4578+440+100+1.5
=547.39 ft
Head Calculation
Department of CEN, PCIU

8. 8
Pump Capacity determination
Introduction Result & Discussion Conclusion
Pump Capacity, P =
HQ
3960
=
547.39𝑥212
3960
=29.3 HP
≅ 30 HP
Department of CEN, PCIU

9. Department of CEN, PCIU
researchgate.net/profile/Mehedi_Masum
For further query feel free to contact:
mehedi.ce.cuet@gmail.com

10. Department of CEN, PCIU