WÄRTSILÄ WARTSILA 50DF, Product Manual

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Fig 15-6 Seating and fastening, resiliently mounted V-engine (DAAE001882)
The machining tool permits a maximum distance of 85mm between the fixing rail and the top
plate.
The brackets of the side and end buffers are welded to the foundation.
Due to the soft mounting the engine will move when passing resonance speeds at start and
stop. Typical amplitudes are +/- 1mm at the crankshaft centre and +/- 5mm at top of the
engine. The torque reaction will cause a displacement of the engine of up to 1.5mm at the
crankshaft centre and 10 mm at the turbocharger outlet. Furthermore the creep and thermal
expansion of the rubber mounts have to be considered when installing and aligning the engine.
15.3 Flexible pipe connections
When the engine is resiliently installed, all connections must be flexible and no grating nor
ladders may be fixed to the engine. Especially the connection to the turbocharger must be
arranged so that the above mentioned displacements can be absorbed. When installing the
flexible pipe connections, unnecessary bending or stretching should be avoided. The external
pipe must be precisely aligned to the fitting or flange on the engine.
The pipe clamps for the pipe outside the flexible connection must be very rigid and welded
to the steel structure of the foundation to prevent vibrations, which could damage the flexible
connection.
See the chapter Piping design, treatment and installation for more detailed information.
15-14 Wärtsilä 50DF Product Guide - a16 - 9 September 2016
Wärtsilä 50DF Product Guide 15. Foundation