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have to learn the nature of fire, because, after all, an
explosion is a very rapid propagation of terminate.
A fire will still only start whenever three conditions are met: fuel,
oxygen, and heat.
A fire can perfectly start inside the crankcase of a diesel
engine in the event the conditions are just right. For all the registered
occurrences of crankcase explosions, an individual factor is common, namely
a hot see. That is the warm source.
Today, let us take a look inside the crankcase. It houses your
crankshaft, connecting rod, piston rod, cylinder boat, piston,
drive gears or chains along with the lubrication oil. To stop
lubrication oil deprivation, protect persons from that moving mechanical
parts, prevent contamination of your oil, and many other reasons
the crankcase is totally enclosed and separated in the external
environment.
First, let us look at the moving parts. There is the reciprocating
mechanism consisting of the crankshaft, journal bearings, together with
connecting rod. Whether it is a crosshead engine, that crosshead sliding
together with reciprocating mechanism. For this trunk type engine, there is
the piston along with the small end bearings.
There are also gears or chains drive an automobile the camshaft. For
reversible engines, the reversing drive mechanisms. There is also
the thrust bearings at the end of the crankshaft to take up the
powered load. There may also be cooling oil pipes, or cooling water
pipes sliding inside crankcase for piston cooling. The piston
rod itself might also be sliding through a gland assembly in the
under piston breathing space.
All the sliding parts can be a hotspot whenever there is
insufficient lubrication to reduce the friction, probably at the time of
starting of this engine or any abnormal interruption in the force
lubrication engine oil system.
Next, the use of fuel oil inside engine. Dripping fuel injectors
will result in incomplete combustion of this fuel above the piston
best. If the dripping is serious, the liquid fuel can find their way
through the piston rings aided by the high pressure of your
combustion process to help eventually find its way in the crankcase.
For shoe type engines, this can be a direct path to that crankcase. It
may be a source of low flash point fuel when mixed with the
lubricating engine oil!
For dripping fuel injectors, it is common to uncover unburnt carbon that
will result in the piston rings to stick of their grooves, thus
destroying the sealing function in the piston rings. This will not
only cause this fuel to drip through, but can also cause fire in the
combustion space to blow past with the gaps between the piston
rings along with the cylinder bore. This might be a source of heat!
You can find other conditions favorable to help cause an explosion, with regard to
example the quality of the oil and the effects of oxidation after having a
long period of usage, the generation of oil mist as a result of agitation of
the oil spray, the property with the oil, etc.
It is impossible to guarantee that will any engine will operate for any
whole of its life without, somewhere, at some point, a hot spot
being. Therefore it is essential that should a hot spot take place and
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