Warning – Burnham PVG User Manual
Page 26
Table 7: Maximum Capacity of Schedule 40 Pipe in CFH* For Natural Gas Pressures of 0.5 psig or Less
Figure 1: Recommended Gas Piping
Table 8: Equivalent Lengths of Standard Pipe Fittings & Valves
B.
Connect boiler gas valve to gas supply system.
WARNING
Failure to use proper thread compounds on all
gas connectors may result in leaks of flammable
gas.
WARNING
Gas supply to boiler and system must be
absolutely shut off prior to installing or servicing
boiler gas piping.
1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow National Fuel
Gas Code, NFPA 54/ANSI Z223.1.
* 1 CFH of Natural Gas is approximately equal to 1 MBH; 1 CFH of LP is approximately equal to 2.5 MBH; con-
tact your gas supplier for the actual heating value of your gas.
2. Use thread (joint) compounds (pipe dope) resistant
to action of liquefied petroleum gas.
3. Install sediment trap, ground-joint union and manual
shut-off valve upstream of boiler gas control valve
and outside jacket. See Figure 13.
Length
[Feet]
0.3 inch w.c. Pressure Drop
0.5 inch w.c. Pressure Drop
½
¾
1
1¼
½
¾
1
1¼
10
132
278
520
1,050
175
360
680
1,400
20
92
190
350
730
120
250
465
950
30
73
152
285
590
97
200
375
770
40
63
130
245
500
82
170
320
660
50
56
115
215
440
73
151
285
580
60
50
105
195
400
66
138
260
530
70
46
96
180
370
61
125
240
490
80
43
90
170
350
57
118
220
460
90
40
84
160
320
53
110
205
430
100
38
79
150
305
50
103
195
400
VALVES FULLY OPEN
Pipe
Size
I.D.
Inches
Gate
Globe
Angle
Swing
Check
90°
Elbow
45°
Elbow
90° Tee, Flow
Through Run
90° Tee, Flow
Through Branch
½”
0.622
0.35
18.6
9.3
4.3
1.6
0.78
1.0
3.1
¾”
0.824
0.44
23.1
11.5
5.3
2.1
0.97
1.4
4.1
1”
1.049
0.56
29.4
14.7
6.8
2.6
1.23
1.8
5.3
1¼”
1.380
0.74
38.6
19.3
8.9
3.5
1.60
2.3
6.9