Kohler Generator Sets 20--2800 kW User Manual download pdf (Page 34)

TP-5700 7/9322 Section 5 Exhaust System

5.1 Flexible Section

A section of flexible exhaust line should be installed

within 2 feet (51 mm) of the engine exhaust outlet. This

limits the stress on the engine exhaust manifold or

turbocharger resulting from engine motion on its

vibration mounts and temperature-induced changes in

pipe dimensions. Never allow the engine manifold or

turbocharger to support the silencer or exhaust piping

weight. The flexible section should be at least 12 inches

(305 mm) long.

Where threaded flexible exhaust connectors are used, a

6-8 inch (152-203 mm) length of pipe should separate

them from the exhaust manifold. This will serve to

reduce the temperature of the flexible connection and

extend its life. It also makes it easier to remove the

flexible section, if necessary, without putting excessive

strain on the engine manifold.

The flexible section should not be bent or used to make

up for misalignment between the engine exhaust and

the exhaust piping. Since typical exhaust temperatures

range from 800°F (427°C) to over 1200°F (649°C) for

some engines, seamless stainless steel should be used

for the flexible section.

5.2 Condensation Trap

A Y- or tee-type condensation trap with a drain plug or

petcock should be installed between the engine and

exhaust silencer as shown in Figure 5-3. This will

prevent condensed moisture in the engine exhaust from

draining into the engine when it is shut down. The trap

should be drained of collected moisture periodically.

TP-5700-5

1. Condensation trap

Figure 5-3 Condensation Trap

5.3 Piping

Exhaust piping should conform to all applicable codes.

In general, exhaust temperatures will be less than

1000°F (538°C) measured at the engine exhaust outlet,

except for infrequent brief periods, and standards for

low heat appliances will apply. For units with exhaust

temperatures below 1000°F (538°C), exhaust piping

should be routed a minimum of 18 inches (457 mm) from

any combustible materials. If exhaust temperatures will

exceed 1000°F (538°C), the minimum distance should

be 36 inches (914 mm).

The heat rejected by exhaust piping, and consequently

the amount of ventilating air required, can be

substantially reduced by insulating exhaust piping with

suitable high-temperature insulation. Exhaust

temperatures are given on each generator model’s

specification sheet.

Placement of exhaust silencer and piping should

consider location of combustible materials. If location of

exhaust cannot avoid these concerns, use a regular

maintenance routine to remove combustible materials.

Combustible materials include building materials as well

as natural surroundings. Keep dry field grass, foliage,

and combustible landscaping material whether or not

seasonal a s afe distance from the exhaust system.

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Kohler Generator Sets 20--2800 kW User Manual Page 34

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