Gas Piping - Burnham INDEPENDENCE IN10 CANADA Installation & Service Instructions Manual

VI. Gas Piping
WARNING
Failure to properly pipe gas supply to boiler may
result in improper operation and damage to the
boiler or structure. Always assure gas piping is
absolutely leak free and of the proper size and
type for the connected load.
An additional gas pressure regulator may be
needed. Consult gas supplier.
A.
Size gas Piping. Design system to provide adequate gas
supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to
boiler. Maximum allowable system pressure is ½
psig. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum gas valve inlet pressure is indicated on
Rating Label, located on the vestibule panel.
2. Maximum gas demand. Table 2 lists boiler input
rate. Also consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment).
Table 2: Rated Input
Boiler Rated Capacity
Model [cubic feet per hour]
Number
Natural
IN3 62
IN4 105
IN5 140
IN6 175
IN7 210
IN8 245
IN9 280
IN10 315
IN11 349
IN12 385
* Gas connection size is 1" on IN10 and IN11
Continuous Ignition (Standing Pilot)
3. Length of piping and number of fittings. Refer to
Table 3 for maximum capacity of Schedule 40 pipe.
Table 4 lists equivalent length for standard fittings.
4. Corrections for the specific gravity of natural gas
can be found in Table 5.
22
Gas
Connection
Size
LP/Propane
24¾ ½
42 ½
56 ½
70 ½
84 ¾
98 ¾
112 ¾
126 ¾*
139½ ¾*
154 1
For materials or conditions other than those listed
above, refer to the National Fuel Gas Code, NFPA 54/
ANSI Z223.1 and/or CAN/CSA B149.1. Installation
Codes, or size system using standard engineering
methods acceptable to authority having jurisdiction.
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.
B.
Connect boiler gas valve to gas supply system.
1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow the National
Fuel Gas Code, NFPA 54/ANSI Z223.1 and/or
CAN/CSA B149.1 Installation Codes.
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 valve and
outside jacket. See Figure 29.
Figure 29: Recommended Gas Piping