Dry Systems - Perkins M300TI Installation Manual

TPD1317e
Due consideration must be given to providing flexibility in the exhaust hose, particularly if the engine is flexibly
mounted. Where the exhaust hose must pass through a bulkhead immediately behind the engine it is preferable
that the arrangement shown in Figure 3 is adopted, using rubber bellows to provide flexibility. Note that the
bellows should be in an unstrained condition when fitted.
Point of water
injection to be
200mm (8 inches)
minimum height
above water line
5 minimum average fall
o
Figure 3 - Movement of the engine on the flexible mounts must not be restricted by
the exhaust hose. Use rubber bellows as shown where space is restricted.
3.2 Dry Systems
Dry exhaust systems for marine installations need careful design to minimize the disadvantages of enclosing
components that are at a high temperature in confined spaces.
The first part of a dry system should include a flexible connection so that excessive weight is not carried by the
connection to the engine. Connections of the stainless steel bellows type are suitable, but care must be taken
to ensure that they are only required to accommodate movements that do not involve twisting the ends of the
bellows relative to each other.
The remainder of the exhaust system should be well insulated to avoid fire risk.
If there is a long exhaust run which gains height as it leaves the engine, it may be necessary to incorporate a
trap to collect condensate and allow it to be drained.
Figures 4, 5 , 6, 7 & 8 show typical systems. The minimum bore of the exhaust pipe should be 76mm (3 inches)
for turbocharged engines, 63mm (2.5 inches) for naturally aspirated engines.
For turbocharged 6 cylinder
engines use silicone rubber
bellows
Chapter 3
For turbocharged 6
cylinder engines, use
a single double hump
bellows where space is
restricted.
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