Scania DI16 Exhaust system In the case of short exhaust systems for certain engine types, the calculation may suggest a relatively small pipe diameter of 90-100 mm. It would then be a good idea to choose the smallest diameter which can be connected directly to standard components, i.e. 115 mm. Pipe bends in the exhaust system must have a large bending radius (1.5-2.0 x the diameter).
Scania DI16 Manual The calculated inside diameter applies to an insulated system, which means that it is not necessary to increase the diameter for insulating. A wet exhaust system must have a larger inside diameter (approximately 10%) than a dry system due to the increased gas flow generated by the evaporated cooling water. A water-jacketed exhaust system can normally be set up with a slightly smaller inside diameter.
Scania DI16 Service Manual Multi-engine installations should have separate exhaust systems for each engine, if possible. If the exhaust pipes for several engines are linked to a common exhaust system, the exhaust systems for each engine should first be calculated individually using the description below. Then calculate the necessary area (A tot) for the common exhaust system by adding together the areas of the exhaust systems for the individual engines. If the engines are of the same type, read off the diameter for the common system in the table.
Scania DI16 Dimensioning the exhaust system
Dimensioning is based on the back pressure in the exhaust system.
The diameter of the exhaust pipes is calculated as follows:
- Calculate the length of the planned exhaust system (Lu).
- Read off the preliminary inside diameter of the exhaust pipes (Dp) in the relevant table in 02:06 Technical data.
- Decide on the total number of 90° pipe bends which will be included in the exhaust system. Two 45° pipe bends equal one 90° pipe bend.
- Read the additional length (Lt) in the graph for calculating the additional length. In this graph, the back pressure is converted from the number of pipe bends used and the discharge resistance to a straight pipe with the length (Lt).
- The additional length (Lt) is only used to calculate the new diameter required. Note that the additional length must also be read for a system without pipe bends because of the discharge resistance. Refer to line 0 in Graph for calculating additional length in exhaust system.
- Add the additional length obtained (Lt) to the planned length (Lu). Then use the calculated total length (Ltot) to read the final diameter in the tables in 02:06 Technical data. Select the next higher standard diameter.
- If corrugated hose is used for a large part of the system, the dimension must be increased by at least 10 %.
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