Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-21
Gas Supply Pipe Sizing
- For
proper operation
of a
single
unit or multiple units, we
recommend
that the gas pipe be sized to allow no more than 0.3" w.c.
pressure
drop from the
source (gas header
or utility meter) to the final unit location. The gas
supplier (utility) should be
consulted
to confirm that sufficient volume and normal
pressure
are provided to the building at the
discharge
side of the gas meter or
supply pipe (for installations of new boilers into an
existing
building, gas pressure
should
be
measured
with a
manometer
to
ensure sufficient pressure
is available).
A
survey
of all
connected
gas using
devices
should be made. If
appliances
other
than the boiler
are connected
to the
gas supply
line, then a
determination should
be
made of how much flow volume (cfh
=
cubic feet per hour) will be
demanded
at
one
time and the
pressure
drop
requirements
when all
appliances are
operating.
The
total
length
of
gas
piping and all fittings must be
considered when sizing
the gas
piping. Total
equivalent
length should be
calculated
from the utility meter or source
to the final
connection. As
a minimum
guideline, gas
piping
Tables
B2 - 16 through
B2 - 20 should be used. The data in these tables is from the
NFPA source
book,
2006 edition.
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