hydraulics, friction losses and calculate friction losses Flashcards
1
Q
Friction loss varies with
A
f directly with roughness of pipe interior
V directly with square of Velocity
D Inversley with Diameter of pipe
l directly length of pipe
independent of pressure
2
Q
Pressure formula
A
P = H X .0981 bar
3
Q
Friction loss formula
a) using Lpm
b) velocity
A
a) Pf = 9000 fl L²
———-
d power of 5
Pf is friction loss in bars f is friction factor l is the length L is flow rate lper min d is diameter mm
b ) 20 flv²
——-
d
4
Q
Formula when change of hose to larger diameter hose.
A
D1
___. All to power 5
D2
Answer will give reduction in pressure loss
