Model 243 Capacity Tables
11
1
1
⁄
2
” Models 243-12-1 and 243-12-2 in SCFH of Natural Gas
(0.6 Specific Gravity - 14.65 psia - 60ºF) (cont’d.)
Outlet Pressure
and Spring
Set Point 1 psi
0.31 psi Droop
Orange Spring
12” to 28” w.c.
143-16-021-06
Set Point 1 psi
0.2 psi Droop
Black Spring
1 to 2 psi
143-16-021-07
Set Point 3 psi
0.35 psi Droop
Cadmium Spring
1
1
⁄
2
to 3 psi
143-16-021-08
Set Point 2 psi
0.6 psi Droop
Cadmium Spring
1
1
⁄
2
to 3 psi
143-16-021-08
Inlet
Pressure
psi
1
1
⁄
4
”
1”
3
⁄
4
”
1
⁄
2
”
3
⁄
8
”
1
⁄
4
”
30
o
30
o
10
o
10
o
10
o
10
o
Orifice Size and Valve Angle
2
5
10
15
25
40
60
80
100
125
2
5
10
15
25
40
60
80
100
125
5
10
15
25
40
60
80
100
125
5
10
15
25
40
60
80
100
125
6500
8000
9000
12000
2800
5500
8000
10000
3500
7000
9000
6000
10000
13000
5000
7500
8500
11500
13500
2450
5100
7500
9100
11000
3000
6000
8000
10000
5300
9300
12000
14500
4000
6000
8000
10000
11500
13000
15000
1500
3700
5700
7100
9300
11000
12500
2000
5000
7000
8000
11500
14000
4100
7100
8800
11000
13500
15000
2000
4000
5500
7000
9500
11000
13500
15000
16000
1200
2400
4000
5300
7300
9300
11000
12500
13000
1400
2500
3500
4800
6500
8000
9000
12000
2700
4700
6200
8600
11000
13500
15000
16000
1300
2200
3000
4000
5500
7400
10000
13000
14000
14000
850
1600
2700
3700
5100
7100
9300
10500
11000
11000
1100
2000
2500
4500
6000
7500
8000
11000
12000
1700
2900
3800
5200
7100
10000
12000
12000
12000
500
1000
1400
1800
2400
3300
4500
6000
7000
8500
500
950
1400
1750
2400
3200
4600
5600
7000
8000
500
1000
1500
1900
3500
4500
6000
7000
8500
900
1400
1700
2400
3200
4600
5600
7000
8000
Last capacity figure in each group indicates maximum allowable inlet pressure (except for emergency conditions). Heavy
stepped line indicates the recommended maximum capacity and inlet pressure for each orifice for operation within the
optimum performance
range.
Note: The performance data is based on normal testing at 70
º
F flowing temperature.
Changes in performance can occur at extreme low flowing temperatures.