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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