Min. purge
Nominal pipe
Area velocity
diameter (mm) (m2) (m/s)
150
0.02
0.6
200
0.03
0.6
250
0.05
0.6
300
0.07
0.6
350
0.1
0.6
400
0.13
0.6
450
0.16
0.6
500
0.2
0.6
550
0.24
0.6
600
0.28
0.6
650
0.33
0.6
700
0.39
0.6
750
0.44
0.6
800
0.5
0.6
850
0.57
0.6
900
0.64
0.6
950
0.71
0.6
1000
0.79
0.6
1050
0.87
0.6
1100
0.95
0.6
1150
1.04
0.6
1200
1.13
0.6
No. of Nitrogen
Minimum flow rate cyclinders required
(m3/min)
in parallel
0.6
1
1.1
2
1.8
2
2.5
3
3.5
4
4.5
5
5.7
6
7.1
8
8.6
9
10.2
11
12.0
12
13.9
14
15.9
16
18.1
19
20.4
21
22.9
23
25.5
26
28.3
29
31.2
32
34.2
35
37.4
38
40.7
41