Catalyst-Housing

For proper working conditions catalysts need high temperatures. Therefore the catalyst should be placed into the exhaust gas system directly after the engine. The experience shows that catalysts have reached lifetimes of up to 8 years. Pulsations in the exhaust gas do not damage catalysts.
The metal substrates are suitable for temperatures of up to 700 °C. Under normal conditions there is no need to worry about temperatures, since with the exception of a few Lambda=1 engines the temperatures of the exhaust gas are below 600°C.
In general all housings are produced to customer specification. Following a few examples.

Row1 shows housings, which can be pushed into the head of a silencer or a heat-exchanger (1.1) or can be flanged in between (1.2 , 1.3 und 1.4).
With the models 1.1, 1.2 und 1.3 the head is designed to suit the diameter of the catalyst. With model 4.2 the catalyst is smaller then the head. If the catalyst needs to be larger then the head, use model 3.1.



Row 2 shows housings, which are welded into the pipework (2.1) or flanged in between (2.2).
 

Housings 3.1 and 3.2, the catalyst is located in the expansion between pipe work and head.
Housing 3.3, the catalyst is in the head and a welded on expansion piece.



At plants where the catalyst needs cleaning more often (e.g. at higher oil consumption), we would recommend a housing where the catalst can be removed easily. At new plants housing 1.1 is used regularly. This type is at low cost and saves space. However the head must be determined to the size of the catalyst. Should this not be possible, the catalyst can also be mounted in a special housing as a kind of draw. (5.1).
Housing 6.1 the catalyst can be fix or mounted as a separate draw. As a draw the right wall is designed as blind flange.