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Pressure Drop High Vacuum System

Fluids Systems Design and Engineering

For sizing a high vacuum distribution system, use this vacuum sizing chart. Assumes velocity of 4,000 fpm,Type L copper, with pressure drop in in. Hg/100 ft

Pressure Drop High Vacuum System Pipes per. Outlet Branch

System Vacuum Branch Piping – 26" Hg
Total
Outlets
Outlets
Used
SCFM
Pipe
Size
Velocity
(FPM)
Pressure
Drop
(in Hg)
1
1.0
0.5
1⁄2
2,556
0.04
2
2.0
1.0
3⁄4
2,454
0.02
3
3.0
1.5
3⁄4
3,705
0.06
4
4.0
2.0
3⁄4
4,998
0.12
5
5.0
2.5
1
3,617
0.05
6
5.7
2.9
1
4,209
0.07
7
6.4
3.2
1
4,657
0.08
8
7.1
3.6
11⁄4
3,412
0.04
9
7.9
3.9
11⁄4
3,701
0.05
10
8.6
4.3
11⁄4
4,088
0.05
11
9.3
4.6
11⁄4
4,380
0.06
12
10.0
5.0
11⁄4
4,771
0.07
13
10.5
5.2
11⁄4
4,967
0.08
14
11.0
5.5
11⁄2
3,683
0.04
15
11.4
5.7
11⁄2
3,819
0.04
16
11.9
6.0
11⁄2
4,023
0.05
17
12.4
6.2
11⁄2
4,160
0.05
18
12.9
6.4
11⁄2
4,296
0.05
19
13.3
6.7
11⁄2
4,502
0.06
20
13.8
6.9
11⁄2
4,639
0.06
21
14.3
7.1
11⁄2
4,777
0.06
22
14.8
7.4
11⁄2
4,984
0.07
23
15.2
7.6
2
2,915
0.02
24
15.7
7.9
2
3,031
0.02

 

Source: Courtesy of Ohmed.
Note: Based on copper pipe type L, ASTM B88.

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