Kohler 20--2800 kW manual Exhaust System

Section 5 Exhaust System

Proper installation of the exhaust system is essential to obtain satisfactory performance from a generator set. The most important factor is that the installed system must not exceed the engine manufacturer’s maximum exhaust back pressure limit. Any exhaust back pressure will limit the maximum power available from the engine. Excessive back pressure may cause serious engine damage.

Excessive back pressure usually results from one or a combination of the following:

DExhaust pipe diameter too small

DExhaust pipe too long

DToo many sharp bends in the exhaust system

DToo small an exhaust silencer or incorrect silencer design

Figure 5-1 and Figure 5-2 show the general arrangement of recommended exhaust systems.

		1
	4	3	2
	5
	6
	7
	8		TP-5700-5
1.	Supports
2.	Pitch line downward
3.	Muffler
4.	Water trap
5.	Drain petcock
6.	Flexible section
7.	Solid section 6--8 in. (152--203 mm)
8.	Manifold

Figure 5-1 Exhaust System, End Inlet Silencer

Exhaust lines should be as short and straight as possible. Schedule 40 black iron pipe is the recommended material. Where possible, sweep elbows with a radius of at least three times the pipe diameter should be used.

The exhaust outlet must be located in a manner that will prevent exhaust fumes from entering a building or enclosure.

		2	1
	9	3
		4
	6	5
	7
	8
			TP-5700-5
1.	Exhaust wall thimble
2.	Muffler
3.	45° Y fitting
4.	Water trap
5.	Drain petcock
6.	Outer diameter adapter and clamp
7.	Flexible section
8.	Manifold
9.	45° elbow

Figure 5-2 Exhaust System, Side Inlet Silencer

TP-5700 7/93 Section 5 Exhaust System 21