14
General
Use piping materials and joining methods acceptable •
to authority having jurisdiction. In absence of such
requirements, follow National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
Size and install gas piping system to provide suffi cient •
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 8.
Support piping with hooks, straps, bands, brackets, •
hangers, or building structure components to prevent or
dampen excessive vibrations and prevent strain on gas
connection. Boiler will not support piping weight.
Use thread (joint) compound (pipe dope) suitable for •
liquefi ed petroleum gas.
Provide sediment trap upstream of gas valve. See Figure •
15.
GAS SUPPLY PIPING
!
CAUTION
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.•
Do not touch any electrical switches; do not •
use any phone in your building
Immediately call your gas supplier from a •
neighbor's phone. Follow gas supplier's
instructions.
If you cannot reach your gas supplier, call •
the fi re department.
TABLE 8: GAS SUPPLY PRESSURE
SIZE
Maximum
Input (Btuh)
Natural Gas Propane
Min. Max. Min. Max.
3 Section 70,000
3.0" w.c.
(0.7 kPa)
13.5" w.c.
(3.3 kPa)
5.0" w.c.
(1.2 kPa)
13.5" w.c.
(3.4 kPa)
4 Section 105,000
5 Section 140,000
6 Section 175,000
7 Section 210,000
8 Section 245,000
9 Section 280,000
Figure 15 - Gas Piping At Boiler
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