Gas Piping - Burnham 8HE Series Installation, Operating And Service Instructions

4

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 allowable gas
valve inlet pressure is indicated on rating label.
2. Maximum gas demand. Table 4-1 lists boiler
input rate. Also consider existing and expected
future gas utilization equipment (i.e. water
heater, cooking equipment).
3. Length of piping and number of fittings. Refer
to Table 4-2 for maximum capacity of Schedule
40 pipe. Table 4-3 lists equivalent length for
standard fittings.
Table 4-1: Rated Input
Rated Capacity
Boiler
(cubic feet per hour,
Model
Natural Gas)
805HE 239
806HE 299
!
WARNING
• Failure to use proper thread compounds on all
gas connectors may result in leaks of flammable
gas.
• Gas supply to boiler and system must be shut off
prior to installing or servicing boiler gas piping
NOTICE: Boilers built for installation at altitudes from 2,001 feet - 5,000 feet above sea level have been specially
orificed to reduce gas input rate 4 percent per 1,000 feet above sea level per the National Fuel Gas Code, NFPA
54/ANSI Z223.1.
22
8HE
B. Connect boiler gas valve to gas supply system.
C. Pressure Test. The boiler and its gas connection
Gas
Connection
Size
3/4 in.
3/4 in.
Installation, Operating & Service Instructions
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.
2. Use thread (joint) compound (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 4-5.
4. All above ground gas piping upstream
from manual gas valve must be electrically
continuous and bonded to a grounding
electrode. Do not use gas piping as a
grounding electrode. Refer to the National
Electrical Code, NFPA 70.
!
DANGER
Explosion Hazard.
Do not use matches, candles, open flames, or
other ignition sources to check for leaks. Failure
to comply could result in severe personal injury,
death or substantial property damage.
must be leak tested before placing boiler in
operation. Follow National Fuel Gas Code, ANSI
Z22.3.1/NFPA 54.
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