Lube oil pressure required for Xhead bearing is greater than Lube oil pressure for main bearing.
Xhead lubrication starts as boundary because of swinging action of the Xhead. As rubbing speed increases a hydrodynamic film builds up.
LO to the crosshead is led through telescopic pipe in B&W engines. LO pressure is around 2.5 bar.
LO to the crosshead is led through articulate arm in Sulzer engines. LO pressure is around 16 bar.
Difference in Xhead Lubrication (B&W and Sulzer engines)
In B&W engines a set of channels has been machined in the lower Xhead bearing in which cooling oil can pass.These channels assist in creating a greater pressure. Therefore we are supplying oil at 2.5 bar.
In Sulzer engines Xhead has a plain lower bearing without channels. In order to inject oil between pin and bearing they have to supply at a greater pressure around 16 bar.
Xhead lubrication starts as boundary because of swinging action of the Xhead. As rubbing speed increases a hydrodynamic film builds up.
LO to the crosshead is led through telescopic pipe in B&W engines. LO pressure is around 2.5 bar.
LO to the crosshead is led through articulate arm in Sulzer engines. LO pressure is around 16 bar.
Difference in Xhead Lubrication (B&W and Sulzer engines)
In B&W engines a set of channels has been machined in the lower Xhead bearing in which cooling oil can pass.These channels assist in creating a greater pressure. Therefore we are supplying oil at 2.5 bar.
In Sulzer engines Xhead has a plain lower bearing without channels. In order to inject oil between pin and bearing they have to supply at a greater pressure around 16 bar.
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