Cla-Val 50-49 - Manual (Page 11)

Model 100-20 Flow Chart (Based on normal flow through a wide open valve)
20 24
10 20 30 40 60 80 100 200 500 1000 2000 5000 10,000 20,000 50,000
1
2
3
4
6
8
10
20
30
40
60
80
100
5 3
Angle Valve Sizes (Inches)
Globe Valve Sizes (Inches) 3 4 6 8 10 12
6 8
16
Pressure Drop — psi
4
18 30 14
Flow Rate gpm (water)
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
Functional Data Model 100-20
*Estimated
Valve Size
Inches 3 4 6 8 10 12 14 16 18 20 24 30
mm. 80 100 150 200 250 300 350 400 460 500 600 760
C V
Factor
Globe
Pattern
Gal./Min. (gpm.) 62 136 229 480 930 1458 1725 2110 2940* 3400* 4020 7900*
Litres/Sec. (l/s.) 15 32.5 55 115 223 350 414 506 705 816 965 1895
Angle
Pattern
Gal./Min. (gpm.) — 135 233 545 — — — — — — — —
Litres/Sec. (l/s.) — 32 56 132 — — — — — — — —
Equivalent
Length
of
Pipe
Globe
Pattern
Feet (ft.) 293 251 777 748 621 654 750 977 983 1125 3005 2130
Meters (m.) 89.3 76.4 237.1 228.1 189.5 199.4 228.7 298.1 299.9 343.2 916.6 649.6
Angle
Pattern
Feet (ft.) — 254 751 580 — — — — — — — —
Meters (m.) — 77.6 229 176.9 — — — — — — — —
K
Factor
Globe Pattern 20.6 12.7 23.1 15.7 10.4 8.5 8.9 10.2 8.4 8.8 19.1 10.5
Angle Pattern — 12.9 22.3 12.2 — — — — — — — —
Liquid Displaced
from Cover Chamber
When Valve Opens
Fl. Oz — — — — — — — — — — — —
U.S. Gal. 0.32 .08 .17 .53 1.26 2.51 4.0 4.0 9.6 9.6 9.6 29.0
ml — — — — — — — — — — — —
Litres .12 .30 .64 2.0 4.8 9.5 15.1 15.1 36.2 36.2 36.2 110