Burnham INDEPENDENCE IN10 CANADA Installation & Service Instructions Manual page 23

Gas - fired boiler
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4. All above ground gas piping upstream from manual
gas valve must be electrically continuous and
bonded to a grounding electrode. Do not use gas
piping as a grounding electrode. Refer to the
National Electrical Code, ANSI/NFPA 70 and/or
CSA C22.1 Electrical Code.
C.
Pressure Test. The boiler and its gas connection must
be leak tested before placing boiler in operation.
1. Protect boiler gas valve. For all testing over ½ psig,
boiler an its individual shut-off valve must be
disconnected from gas supply piping. For testing at
Table 3: Maximum Capacity of Schedule 40 Pipe in CFH for Natural Gas Pressures of 0.5 psig or Less
Length\
[Feet]
½
10
132
20
92
30
73
40
63
50
56
60
50
70
46
80
43
90
40
100
38
Table 4: Fitting Equivalent Lengths
Fitting
½
45° Ell
0.7
90° Ell
1.6
Tee
3.1
(As Elbow)
USA boilers built for installation at altitudes greater than 2,000 feet above sea level have been specially orificed
to reduce gas input rate 4 percent per 1,000 feet above sea level per the National Fuel Gas Code, NFPA 54/
ANSI Z223.1. Canadian boilers' orifice sizing is indicated on the rating label. High altitude boiler models are
identifiable by the third digit in the model number suffix on the rating label:
0.3 inch w.c. Pressure Drop
¾
1
278
520
190
350
152
285
130
245
115
215
105
195
96
180
90
170
84
160
79
150
Nominal Pipe Size
¾
1
1.0
1.2
2.1
2.6
4.1
5.2
_IN_ _ _ - _ _ 2 less than 2000 ft. elevation
_IN_ _ _ - _ _ 4 2000 to 4500 ft. elevation (Canada)
_IN_ _ _ - _ _ 5 2000 to 5000 ft. elevation (USA)
½ psig or less, isolate boiler from gas supply piping
by closing boiler's individual manual shut-off valve.
2. Using soap solution, or similar non-combustible
solution, electronic leak detector or other approved
method. Check that boiler gas piping valves, and all
other components are leak free. Eliminate any
leaks.
Doe not use matches, candles, open flames or
other ignition source to check for leaks.
1,050
175
730
120
590
97
500
82
440
73
400
66
370
61
350
57
320
53
305
50
Table 5: Specific Gravity Correction Factors for
Specific
Gravity
0.50
0.55
0.60
1.6
0.65
3.5
0.70
0.75
6.9
0.80
NOTICE
DANGER
0.5 inch w.c. Pressure Drop
½
¾
360
250
200
170
151
138
125
118
110
103
Natural Gas
Correction
Specific
Factor
Gravity
1.10
1.04
1.00
0.96
0.93
0.90
0.87
1
680
1,400
465
950
375
770
320
660
285
580
260
530
240
490
220
460
205
430
195
400
Correction
Factor
1.30
1.07
1.40
1.04
1.50
1.00
1.60
0.97
1.70
0.94
2

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