Related Resources: fluid flow
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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