C - Gas Piping - Burnham ES2 ES2 Installation & Service Instructions Manual

ASSURE GAS PIPING IS LEAK FREE
AND OF PROPER SIZE and type for the
connected load.
SHUT OFF MAIN GAS SUPPLY prior to
installing or servicing boiler gas piping.
Determine the boiler's maximum gas
1.
demand and minimum gas supply pressure
(printed on the boiler's rating label) and the
demand of other gas appliances served by
the same gas meter.
Ensure that gas piping, fittings, and gas
2.
meter capacities can supply the maximum
gas demand of all appliances at pressures
above their minimum allowable gas
pressure. Tables C-1 and C-2 provide typical
capacities of gas pipes and fittings.
Derate the gas flow through pipes by
3.
multiplying by a correction factor in Table
C-3 based on the specific gravity of the gas.
For materials or conditions other than those
4.
listed above, refer to the National Fuel Gas
Table C-1: Maximum Capacity of Schedule 40 Pipe in Cubic Feet Per Hour (CFH)
Length
(Feet)
½
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 43
90 40
100 38
*
1 CFH of Natural Gas is approximately equal to 1000 BTU/hr; 1 CFH of LP is approximately equal to 2500 BTU/hr.
Table C-2: Equivalent Lengths (ft) Of Standard Pipe Fittings & Valves
Pipe
Gate
Size
½" 0
¾" 0
1" 1
1 ¼" 1
1 ½" 1
36
APPENDIX C – GAS PIPING
0.3" 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
Swing
Globe Angle
Check
19 9
23 12
29 15
39 20
45 22 11
Table C-3: Specific Gravity Correction Factors For
Natural Gas
Specific
Gravity
0.50
0.55
0.60
0.65
0.70
0.75
0.80
Code, NFPA54/ANSI Z223.1, or size the
system using standard engineering methods
acceptable to authority having jurisdiction.
USE PROPER THREAD COMPONENTS
on all gas connectors.
USE THREAD (JOINT) COMPOUNDS
(pipe dope) rated for liquefied petroleum
gas.
1¼ ½
1050 175
730 120
590 97
500 82
440 73
400 66
370 61
350 57
320 53
305 50
90° 45°
Elbow Elbow
4 2 1
5 2 1
7 3 1
9 4 2
5 3
Correction Specific
Factor Gravity
1.10 0.85
1.04 0.90
1.00 1.00
0.96 1.10
0.93 1.20
0.90 1.30
0.87 1.40
*
0.5" w.c. Pressure Drop
¾ 1
360 680
250 465
200 375
170 320
151 285
138 260
125 240
118 220
110 205
103 195
90° 'T', Flow 90° 'T', Flow
Through Run Through Branch
1
1
2
2
3
Correction
Factor
0.81
0.82
0.78
0.74
0.71
0.68
0.66
1¼
1400
950
770
660
580
530
490
460
430
400
3
4
5
7
8