Head loss calculation for CIRCULATION PUMP Computed By : Karthy

Head loss calculation using ( 1 ) COLBROOK Formula

no. mm m mm GPM l/s 0.2

0.6

8.0

2.0

0.2

0.3

0.9

0.5

2.0

1.0 1/1 m m/s 1/1 1/1 m m m m m m

Suction 4" cop 98 20 0.01 160 10.1 1 2 1 1.7 1.3372 131004.83 0.01763 1.64 0.33 0.155 0.48 0.48 0.483

" 4" cop 98 6 0.01 318 20 2 2 2 1 1 5.3 2.6577 260372.09 0.01577 5.79 0.35 1.908 2.26 2.26 2.256

Discharge 4" cop 98 31 0.01 318 20 4 1 2.1 5.8 2.6577 260372.09 0.01577 5.79 1.8 0.756 2.55 8.35 8.352

" 4" cop 98 3 0.01 160 10.1 1 1 2 1 1.3372 131004.83 0.01763 1.64 0.05 0.091 0.14 0.14 0.14

TOTAL 60 4 1 10 1 5.8 2.52 2.91 5.43

Static head = 5.80 m

friction loss for pipes and fittings = 5.43 m

dynamic head = 11.23 m

TENDER 20 L/s @ 15 m

RECOMMENDED HEAD WITH 10% SAFETY = 13 m

tee

reducer

gate valve

no. part of pipe

DN Nominal diameter

Butterfly valve

ID Pipe Inner diameter

L Pipe length

K Pipe roughness

Q Flow rate

11.23

dh(1) Liner loss

Strainer

discharge outlet

Accumulative Pressure

DH Total loss

Total heal (DH+GH) / pipe

V Mean Velocity

RE Reynolds number

Total local factors

DN

check valve

Loss m per 100 m

dh(2) Local loss

GH Static heal

F Liner loss factor

Balance valve

Local factors of fittings

elbow ( 45 leg.)

elbow ( 90 leg.)