Venting of diaphragm gas components – Raypak RAYTHERM P-926 User Manual
Page 9
9
MANOMETER
GAS PRESSURE
TEST AT GAS
VALVE
GAS PRESSURE TEST
AT HEATER
MANUAL
SHUTOFF
VALVE
GAS PRESSURE
TEST UPSTREAM
Model
No.
1”
1-1/4”
1-1/2”
2”
2-1/2”
3”
4”
N
P
N
P
N
P
N
P
N
P
N
P
N
P
926/962
15
20
45
45
110 150
360
400
1083/1125
10
15
35
35
80
120
300
300
1178/1223
25
25
60
85
220
200
1287/1336
25
20
55
75
180
170 325 560
1414/1468
20
15
45
65
150
165 300 500
1571/1631
15
15
35
50
20
125 250 400
1758/1826
15
10
30
40
100
100 225 340
2100
10
10
25
30
80
75
175 260
2500
15
20
55
55
135 160 400 600
3001
10
15
35
40
85
120 250 500
3500
10
30
30
45
80
200 400 600
4001
5
20
25
35
65
160 300 400
Natural Gas, 1000 BTU/FT
3
.60 Specific Gravity @ 0.5 in. WC Pressure Drop
Propane Gas, 2500 BTU/FT
3
1.53 Specific Gravity @ 0.6 in. WC Pressure Drop
Table B: Maximum Equivalent Pipe Length
Fig. 6: Gas Pressure Test Points
Venting of Diaphragm Gas
Components
Heaters with gas train components that have
diaphragms in their construction are supplied with a
bleed line connection that must be connected to the
outside atmosphere as required by the National Fuel
Bleed Line
Connection
Fig. 7: Bleed Line Connection
Gas Code. Under NO circumstances shall bleed lines
terminate in the gas utilization equipment flue or
exhaust system.