TP-6727 10/11 21Section 2 Open Units
1
TP-5700-5
1. Condensation trap
Figure 2-10 Condensation Trap
2.3.3 Piping
Note: Select piping with a diameter that is the same size
as or larger than the manifold outlet’s inside
diameter.
D Keep exhaust lines as short and straight as possible.
D Use schedule 40 black-iron pipe.
D Use sweep elbows with a radius of at least three times
the pipe diameter.
D Use exhaust piping that conforms to applicable
codes.
D Support the exhaust piping securely, allowing for
thermal expansion.
D Insulate the exhaust piping with high-temperature
insulation to reduce the heat rejected by exhaust
piping and consequently the amount of ventilating air
required.
Exhaust temperatures measured at the engine’s
exhaust outlet are listed on the generator set
specification sheets.
Route the exhaust piping a minimum of 914 mm (36 in.).
from combustible material, including building materials
and natural surroundings.
When planning exhaust silencer and piping placement,
consider the location of combustible materials. If the
proximity of the exhaust system to the combustible
materials cannot be avoided, follow a regular
maintenance schedule to ensure that combustible
materials are kept away from the exhaust pipes after
installation. Combustible materials include building
materials as well as natural surroundings. Keep dry field
grass, foliage, and combustible landscaping material a
safe distance from the exhaust system.
2.3.4 Double-Sleeved Thimbles
If the exhaust pipe passes through a wall or roof, use a
double-sleeved exhaust thimble to prevent the
transmission of exhaust pipe heat to the combustible
material. Figure 2-11 shows construction details of a
typical double-sleeved thimble in which exhaust piping
passes through a combustible structure. Sheet metal
shops usually fabricate thimbles using installation
engineer’s specifications and drawings.
Construct the thimble so it extends at least 254 mm
(10 in.) both inside and outside the structure’s surface.
Openings at both ends of the thimble allow cooling air to
circulate through the thimble. If screening is used on the
outer end to keep birds and animals from entering the
thimble, use a mesh large enough to allow unrestricted
air circulation through the thimble. See Section 2.3.5 for
additional exhaust outlet location and protection
considerations.
2.3.5 Exhaust Outlet
Outlet location. Engine performance and efficiency
depend on the location of the exhaust outlet. Direct the
exhaust outlet away from the air inlet to prevent exhaust
gases from entering the air inlet and clogging the
dry-type air filter elements. Hot exhaust drawn through
the radiator adversely affects engine cooling. Locate
the exhaust outlet to prevent exhaust fumes from
entering a building or enclosure.
Noise reduction. The exhaust outlet configuration
affects the apparent noise level for people or animals in
the vicinity. An upward-directed outlet seems quieter
than one directed downward or horizontally.
Additionally, a 30- to 45-degree angled cut at the end of
a horizontal exhaust outlet pipe reduces turbulence at
the outlet, thereby reducing the noise level.
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