| 
Flow charts :
The
charts given are obtained
by Hazen – Williams
formula . they show
friction loss of
head (unit
in m ) against piping
length L = 1.000m .
All
the values are based on
C=140 . When it is
necessary to find the
values for other
values
of C, they can be obtained
by multiply the friction
loss of head for C=140 by
the
following proportional
coefficient.
Proportional Coefficients for Friciton
loss of head by Hazen-
Williams formula.
|
C |
Coefficient |
C |
Coefficient |
| 140 |
1.0000 |
115 |
1.4391 |
| 135 |
1.0697 |
110 |
1.5622 |
| 130 |
1.1470 |
105 |
1.7028 |
| 125 |
1.2333 |
100 |
1.8636 |
| 120 |
1.3300 |
95 |
2.0490 |
Frictional
Properties
The
smooth bores of PVC pipes
have better flow
characteristics than those
of metal pipes .
The
friction co-efficients of
P.P.P pipes are :
|
Friction
co-efficient |
| |
Up
to including 315
mm |
and
over 315 mm |
| Hazen
williams |
135
- 150 |
150 |
| Colebrook |
0.001 |
0.001 |
   
|
