6
5. Determine the Orifice or Flow Control Valve Size for this Blowdown Rate
Use the following graphs to select a flow control device:
Flow Rate in Lbs/hr for Various Orifices
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
10
20
30
40
50
60
70
80
90
100
200
300
Pressure PSI
Lbs/hr
1/8 inch dia
3/16 inch dia
1/4 inch dia
5/16 inch dia
Flow Control Valve
Maximum Flow Rates in Lbs/hr
0
5000
10000
15000
20000
25000
20
30
40
50
60
70
80
90
100
150
200
300
Pressure PSI
Lbs/hr
1/2" 150 PSI
1/2" 300 PSI
3/4" 150 PSI
3/4" 300 PSI