User Manual

Model 100-21 Flow Chart (Based on normal flow through a wide open valve)
K =
894d
4
C
2
v
L =
K
12 f
K Factor (Resistance Coefficient)
The Value of K is calculated from the formula:
(U.S. system units)
Equivalent Length of Pipe
Equivalent lengths of pipe (L) are determined from the formula:
(U.S. system units)
Fluid Velocity
Fluid velocity can be calculated from the following formula:
(U.S. system units)
d
V =
.4085 Q
2
d
C
V
Factor
Formulas for computing C Factor, Flow (Q) and Pressure Drop
V
( P):
C
V
=
Q
P
C
V
=
Q
P
C
V
=
Q
P
2
V
Where:
U.S. (gpm) @ 1 psi differential at 60 F water
(l/s) @ 1 bar (14.5 PSIG) differential
or
at 15 C water
inside pipe diameter of Schedule 40 Steel Pipe (inches)
friction factor for clean, new Schedule 40 pipe
(dimensionless) (from Cameron Hydraulic Data,
18th Edition, P 3-119)
Resistance Coefficient (calculated)
Equivalent Length of Pipe (feet)
Flow Rate in U.S. (gpm) or (l/s)
Fluid Velocity (feet per second) or (meters per second)
Pressure Drop in (psi) or (bar)
=
=
=
=
=
=
=
=
=
P
V
Q
L
K
f
d
C
3
80
62
15
—
—
293
89.3
—
—
20.6
—
—
.032
—
.12
4
100
136
32.5
135
32
251
76.4
254
77.6
12.7
12.9
—
.08
—
.30
6
150
229
55
233
56
777
237.1
751
229
23.1
22.3
—
.17
—
.64
8
200
480
115
545
132
748
228.1
580
176.9
15.7
12.2
—
.53
—
2.0
10
250
930
223
—
—
621
189.5
—
—
10.4
—
—
1.26
—
4.8
12
300
1458
350
—
—
654
199.4
—
—
8.5
—
—
2.51
—
9.5
14
350
1725
414
—
—
750
228.7
—
—
8.9
—
—
4
—
15.1
16
400
2110
506
—
—
977
298.1
—
—
10.2
—
—
4
—
15.1
18
460
2940
705
—
—
983
299.9
—
—
8.4
—
—
9.6
—
36.2
20
510
3400*
816
—
—
1125
343.2
—
—
8.8
—
—
9.6
—
36.2
24
610
3500*
840
—
—
3005
916.6
—
—
19.1
—
—
9.6
—
36.2
30
750
7900*
1895
—
—
2130
649.6
—
—
10.5
—
—
29.0
—
110
Globe
Pattern
Angle
Pattern
Globe
Pattern
Angle
Pattern
Equivalent
Length
of
Pipe
C
V
Factor
Functional Data Model 100-21
*Estimated
Valve Size
Liquid Displaced
from Diaphragm
Chamber When
Valve Opens
K
Factor
mm.
Gal./Min. (gpm.)
Litres/Sec. (l/s.)
Gal./Min. (gpm.)
Litres/Sec. (l/s.)
Feet (ft.)
Meters (m.)
Feet (ft.)
Meters (m.)
Fl. Oz
U.S. Gal.
ml
Litres
Inches
Globe Pattern
Angle Pattern