EXHAUST
I WARNING
Inhalation of exhaust gases can result in
death.
Engine exhaust gas must be piped outside building
or
enclosure.
Do not
terminate exhaust pipe near inlet,
vents
or
combustible materials.
An
approved thimble
(Figure
11)
must
be
used where exhaust pipes pass
through walls
or
partitions. Pitch exhaust pipes
downward
or
install
a
condensation trap (Figure
12)
at the point where a rise in the exhaust system begins.
Avoid sharp bends; use sweeping long radius elbows.
Provide adequate support
for
mufflers
and
exhaust
pipes.
Refer
to
Figure
7
for a typical exhaust installa-
tion.
Shield
or
insulate exhaust lines
if
there is danger
of personal contact. Allow
at
least 9-inches (230
mm)
of clearance
if the
pipes
run
close
to a
combustible
wall
or
partition. Use
a
pipe
at
least as large as the
2-
inch
(50 mm)
pipe size outlet
of the
engine.
Suspend
the
pipe from
the
enclosure structure
and
attach
to
engine with a flexible section. Place muffler
as close to engine as possible to reduce condensation
damage
and
carbon fouling.
IF EXHAUST LINE MUST
BE
PITCHED UPWARD.'
• CONSTRUCT
A
TRAP
OF
PIPE FITTINGS
AT
POINT
OF
RISE
DRAIN CONDENSATION TRAP
PERIODICALLY
FIGURE
12. EXHAUST CONDENSATION TRAP
RAIN
CAP
DRIP
CAP
HOLES
IN END OF
INNER SLEEVE
WALL
OR
PARTITION
-"Jl
INNER SLEEVE
FIGURE
11.
TYPICAL
EXHAUST THIMBLE
Minimum diameters
and
maximum lengths
of
pipe
(with critical muffler[s])
are as
follows:
Single Exhaust system:
2.5-inch
(67
mm) pipe 9-feet
(3 m)
3.0-inch
(76
mm) pipe 89-feet
(27 m)
3.5-inch
(90
mm) pipe ......
/
168-fee't (51
m)
Maximum permissible exhaust restriction (back
pressure)
is
20.4-inches (508
mm)
H2O manometer,
or 11.8 ounces (5.1 kPa) gauge.
17
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