Pressure Drop Equivalent Length of Pipes and Fittings


HVAC Systems & Components
Heating Ventilating Air Conditioning HVAC

Pressure Drop Equivalent Length of Pipes and Fittings
Screwed fittings, turbulent flow only, equipment length in feet.

Fittings
Pipe Size
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
Standard 90° Elbow
3.6
4.4
5.2
6.6
7.4
8.5
9.3
11
Long rad. 90° Elbow
2.2
2.3
2.7
3.2
3.4
3.6
3.6
4.0
Standard 45° Elbow
.71
.92
1.3
1.7
2.1
2.7
3.2
3.9
Tee Line flow
1.7
2.4
3.2
4.6
5.6
7.7
9.3
12
Tee Br flow
4.2
5.3
6.6
8.7
9.9
12
13
17
180° Ret bend
3.6
4.4
5.2
6.6
7.4
8.5
9.3
11
Globe Valve
22
24
29
37
42
54
62
79
Gate Valve
.56
.67
.84
1.1
1.2
1.5
1.7
1.9
Angle Valve
15
15
17
18
18
18
18
18
Swing Check
8.0
8.8
11
13
15
19
22
27
Union or Coupling
.21
.24
.29
.36
.39
.45
.47
.53
Bellmouth inlet
.10
.13
.18
.26
.31
.43
.52
.67
Sq mouth inlet
.96
1.3
1.8
2.6
3.1
4.3
5.2
6.7
Reentrant Pipe
1.9
2.6
3.6
5.1
6.2
8.5
10
13
Pipe/Fitting Enlargement
Feet of liquid loss = (V1 - V2)2/2g

Where:

V1 & V2 = entering and leaving velocities and g = 32.17 ft/sec2

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