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APPeNDIX f – Adjusting Gas Input Rate (continued)
Table F-1: Gas Flow Rate in Cu. Ft. / Hr.
Seconds for Two
One-Half
(2) Revolutions
Cu. Ft.
24
26
28
30
34
38
42
46
50
55
60
65
70
80
90
100
120
140
160
180
200
Remove Main Burners per procedure in
(1)
Boiler Service instructions in Section (X).
Remove gas orifices. Drill each orifice
(2)
one (1) drill size larger (drill size is
stamped on orifice).
Reinstall gas orifices and main burner.
(3)
Repeat procedure to measure input rate.
Size of Gas Meter Dial
One
Cu. Ft.
Cu. Ft.
150.0
300.0
450.0
138.4
276.9
415.3
128.5
257.1
385.7
120.0
240.0
360.0
105.8
211.7
317.6
94.7
189.4
284.2
85.7
171.4
257.1
78.2
156.5
234.7
72.0
144.0
216.0
65.4
130.9
196.3
60.0
120.0
180.0
55.3
110.7
166.1
51.4
102.8
154.2
45.0
90.0
135.0
40.0
80.0
120.0
36.0
72.0
108.0
30.0
60.0
25.7
51.4
22.5
47.0
20.0
40.0
18.0
36.0
Recheck Main Burner Flame.
15.
Return other gas-fired appliances to
16.
Two
previous condition of use.
LP/Propane Gas Boilers:
Follow the procedure for gas boilers, except:
1.
Adjust tank regulator for gas valve inlet
2.
pressure of 13.5 inches w.c. or less, but not
less than 11.5 inches w.c.
Gas valve has step-opening regulator, which
3.
initially opens to 1.4 to 2.5 inches w.c. and
steps to full pressure after approximately 30
seconds. Check manifold pressure after step
has occurred.
Leak test Gas Piping:
THE BOILER AND ITS GAS
CONNECTIONS must be leak tested and
leak free before placing boiler in operation.
disconnect boiler and its individual shut-
90.0
off valve from gas supply piping.
77.1
67.5
For testing at ½ psig or less, isolate boiler
1.
from gas supply piping by closing boiler's
60.0
individual manual shut-off valve.
54.0
Check for gas leaks in all piping joints,
2.
valves, and fittings using a non-corrosive
leak detection solution or an electronic leak
detector.
Repair any leaks.
3.
FOR LEAK TESTING OVER ½ PSIG,
45
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