Install Instructions

52
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.
1. Determine the boiler’s maximum gas
demand and minimum gas supply pressure
4. For materials or conditions other than those
listed above, refer to the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, 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 liqueed petroleum
gas.
5. Bond all above-ground gas piping to a
grounding electrode and ensure the piping is
electrically continuous.
DO NOT USE GAS PIPING AS A
GROUNDING ELECTRODE. Refer to
National Electrical Code, NFPA 70.
6. Install sediment trap, ground-joint union and
manual shut-off valve upstream of boiler gas
control valve and outside jacket.
7. When the piping is completed, test it for
leaks.
(1) When testing over ½ psig, disconnect
the boiler and its individual shut-off valve
from the gas supply piping.
(2) When testing at ½ psig or less, isolate
boiler from gas supply piping by closing
boiler’s individual manual shut-off valve.
(3) Locate leaks using approved
combustible gas detector or
nonammable, non-corrosive leak
detection solution.
DO NOT CHECK FOR LEAKS USING
OPEN FLAMES such as matches or
candles or devices that spark.
8. Repair any detected leaks.
APPENDIX C – Gas Piping (continued)
Table C-3: Specic Gravity Correction Factors For
Natural Gas
Specic
Gravity
Correction
Factor
Specic
Gravity
Correction
Factor
0.50 1.10 0.85 0.81
0.55 1.04 0.90 0.82
0.60 1.00 1.00 0.78
0.65 0.96 1.10 0.74
0.70 0.93 1.20 0.71
0.75 0.90 1.30 0.68
0.80 0.87 1.40 0.66
(printed on the boiler’s rating label) and the
demand of other gas appliances served by
the same gas meter.
2. Ensure that gas piping, ttings, and gas
meter capacities can supply the maximum
gas demand of all appliances at pressures
above their minimum allowable gas
pressure. The following tables provide
typical capacities of gas pipes and ttings.
3. Derate the gas ow through pipes by
multiplying by a correction factor in Table
C-3 based on the specic gravity of the gas.