Moteurs Baudouin 12M26 Series, Operation & Maintenance Manual

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Operation & Maintenance Manual for 12M26 Series Gas Engine
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Fig 3-1 Engine Lifting
3.3 Installation of the natural gas engine
3.3.1 Engine installation
(1) The engine and chassis must be connected with a flexible shock absorber.
(2) Use flexible connection and ensure that the crankshaft centerline concentric with the input shat
of the transmission (gear box, transmission box) so that the crankshaft is not affected by the
additional force originated from the installation. Concentricity requirements: flexible connection
≤0.3mm, rigid connection ≤0.1mm.If such requirements cannot be guaranteed, it is recommended
to use flexible coupling plus universal joint.
3.3.2 External engine system installation
The engine exhaust pipe should avoid excessive bending. The pipeline should be fitted with
intermediate expansion joints and additional support. The inner diameter of the exhaust pipe shall
not be less than 120mm, and the exhaust back pressure shall not exceed 6kPa.
The outdoor exhaust pipe should be equipped with the rain cover to prevent rainwater from
entering the exhaust system.
Fuel tank capacity should be able to meet the requirements of8 hours of work under rated load.
The location of the fuel tank should not be lower than the fuel supply pump inlet of the injection
pump. The inner diameter of the fuel pipeline should not be less than 12 mm.
3.3.3 Installation of the gas equipment
Gas line
：
Gas source—Gas equipment—Gas shut-off valve—Gas filter—Pressure
regulator—Back-fire relief valve—Fuel valve—Mixer
The gas should meet the requirement which mentioned in4.1.1.
Notice
：
1.To guarantee the normal work of the engine, the fuel gas pressure should not be less than 105
kPa (absolute pressure).If the gas press above 20 kPa, should be equipped with regulator.The
normal gas pressure is
（
3-5
）
kPa. The pipe from gas source to pressure regulator should be
connected by flange or thread. The gas pipe after pressure regulator can use rubber horse
，
the
length of the pipe should be less than 1m ， the inner-diameter of the pipe should be greater than the
gas diameter of the mixer.
2.The dust inside the pipes should be purged with high-pressure air before connecting them. The
connecting pipes may not be scratched or crushed.
3.If the gas resource is in low pressure
，
in order to ensure the long-term stable operation ,it should
be installed the buffer tank before the gas engine pipe , ensure 7.5 second gas volume as buffer