Comprehensive List of Imported Diesel Generator Models
How to install the exhaust system of a diesel generator set
The function of the exhaust system is to safely discharge engine emissions outdoors and keep them, along with dust and noise, away from buildings and people.
During the installation of diesel generator sets, to absorb thermal expansion and the displacement and vibration of the generator set, the exhaust outlets should be connected with expandable stainless steel bellows of 24 inches or more. Similarly, the exhaust outlets of small generator sets directly mounted on the floor should also have bellows of 18 inches or more.
Hose bellows must never be used as elbows or to compensate for installation errors in pipeline. To minimize condensation corrosion, the exhaust muffler should be installed as close to the engine as possible for quick heating. The muffler and exhaust pipe should be supported by hangers; it is strictly prohibited to use the engine exhaust pipe for support. Otherwise, it may damage the engine exhaust pipe and reduce the lifespan of the turbocharger. It is recommended to use black iron pipes for the exhaust system. Choose elbows with larger radii whenever possible.
Under the condition of meeting the exhaust backpressure limit of the engine, it is recommended that the nominal diameter of the entire exhaust system pipe be as consistent as possible with the engine exhaust outlet. Pipes with diameters smaller than the exhaust outlet are prohibited, as larger pipes are more susceptible to condensation corrosion and will also increase exhaust gas volume, leading to power loss. The smaller the diameter change in the exhaust system, the less the friction loss. Insulate all mufflers and exhaust pipes to prevent accidental contact with fire or误 activation of automatic fire extinguishing equipment, and reduce condensation corrosion and heat radiation in the engine room. The exhaust pipe and flammable materials should be at least 9 inches apart. When it is necessary to pass through walls and ceilings, the exhaust pipe should be fitted with a flame-retardant sleeve or insulation. At room temperature, for every 100°F increase, the exhaust pipe expands approximately 0.0076 inches per inch. It is recommended to use stainless steel bellows to absorb the thermal expansion of long straight pipes. The horizontal exhaust pipe should have a slope, with the lower end away from the engine and extending towards the outdoors or condensate collector.
The condensate drain and plug should be installed at the vertical turn of the exhaust pipe. The end of the exhaust system should be positioned away from the building and intake vents to prevent soiling walls and windows. Install the exhaust system on the leeward side of the building, as high as possible, to facilitate waste gas排放. Certain standards specify that the end of the exhaust pipe should be at least 3 meters from the ground, 1 meter from the outer wall or roof, and 3 meters from the building entrance, with a minimum height of 3 meters above adjacent buildings. A rain shield should be added to the vertical exhaust outlet.
Diesel generator sets must not share the exhaust system with other equipment. Fumes, corrosive condensate, and high-temperature exhaust gases must not damage general equipment. The back pressure of the exhaust pipe must not exceed the permitted value specified in the engine manual. Typically, it should be between 20mbar and 50mbar. Excessive back pressure can lead to high-temperature exhaust gases and fumes, reducing the engine's power and lifespan.
Before finalizing the exhaust system layout, estimate the engine exhaust back pressure; before the generator is officially put into operation, measure the exhaust back pressure at full load operation.
