Equivalent Lengths Of Standard Pipe Fittings & Valves; Recommended Gas Piping - Burnham PVG Installation, Operating And Service Instructions

Table 7: Maximum Capacity of Schedule 40 Pipe in CFH* For Natural Gas Pressures of 0.5 psig or Less
Length
½
[Feet]
10 132
92
20
73
30
40 63
50 56
60 50
70
46
80 43
90
40
100 38
* 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.
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.
Table 8: Equivalent Lengths of Standard Pipe Fittings & Valves
I.D.
Pipe
Size
Inches
½" 0.622
0.824
¾"
1.049
1"
1.380
1¼"
0.3 inch w.c. Pressure Drop
¾ 1
278
520
190
350
152 285
130 245
115 215
195
105
96
180
90 170
84 160
79
150
Globe
Gate Angle
0.35 18.6 9.3
0.44 23.1 11.5
0.56 29.4 14.7
0.74 38.6 19.3
½
1¼
175
1,050
730
120
590 97
500 82
73
440
400 66
370
61
57
350
320 53
305 50
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.
Figure 1: Recommended Gas Piping
VALVES FULLY OPEN
90°
Swing
Check Elbow
4.3 1.6
5.3 2.1
6.8 2.6
8.9 3.5
0.5 inch w.c. Pressure Drop
¾ 1
360 680
250 465
375
200
170
320
151 285
138 260
125 240
118 220
110 205
195
103
90° Tee, Flow
45°
Elbow
Through Run
0.78 1.0
0.97 1.4
1.23 1.8
1.60 2.3
1¼
1,400
950
770
660
580
530
490
460
430
400
90° Tee, Flow
Through Branch
3.1
4.1
5.3
6.9
7