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Appendix
Appendix
Installation & Maintenance
Assemblies
Equipment & Accessories
Fittings
Hoses
Hose Pressure Drop
Pressure drop is defined as the
difference in input pressure and output
pressure of a hose assembly. There
are many factors which can contribute
to pressure drop including the length
of the hose assembly, the type and
temperature of the fluid, flow rate, the
inside diameter of the hose, and the
type of couplings used.
If pressure drop is a concern, this chart
can be used for a quick estimate for a
hose assembly that is 10 feet long with
a fluid specification of .85 specific
Pressure Drop (psi)
Dash Size -3 -4
-5
-6
-8
-10 -12
-16
-20 -24 -32
-40
-48
Hose ID 3/16 1/4
5/16 3/8 1/2
5/8 3/4 1
1
e
1
f
2
2
f
3
in.
U.S.
0.25
10
3.1
0.50
19
6
2.7
gpm
1
40
12
5.5
2.4
2
95
24
10
4.8
3
185 46
17
7
2.2
4
78
29
12
3
1.2
5
120
44
18
4.5
1.6
0.7
8
95
39
10
3.6
1.4
10
59
15
5.7
2
0.6
12
80
20
7.2
2.6
0.8
15
30
10
4.2
1.2
0.4
18
40
15
6.3
1.5
0.6
20
49
19
8
2
0.7
0.3
25
72
26
11
3
1
0.4
30
34
14
3.6
1.3
0.5
0.1
35
47
19
5
1.7
0.7
0.2
40
25
6.5
2.2
0.9
0.2
50
36
9
3.3
1.3
0.4
0.2
60
50
12
4.4
1.8
0.5
0.2
70
17
6
2.4
0.7
0.3
80
21
7.1
3
0.8
0.3
0.1
90
27
9
3.8
1
0.5
0.1
100
33
12
4.7
1.3
0.6
0.2
150
60
22
8.5
2.2
1
0.3
200
36
15
3.9
1.7
0.6
250
54
22
5.3
2.5
0.8
300
29
7.5
4
1.1
400
51
14
6.5
2.2
500
20
10
3
800
18
5
1000
10
gravity, a viscosity of 20 centistokes
(97
S.S.U.), and a temperature of 100˚F
(38
˚C). Differences in fluids, fluid
temperature, and viscosity can increase
or decrease actual pressure drop
compared to the values listed.