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Seems like the discussion has stopped. Please provide more inputs if any....

Attached are the pictures showing main bearings and big end bearings arrangement

Replying to above question the lube oil pump temperature and pressure of all 3 pumps is same. And all 3 pumps are in continuous operation and don't stop

I was having a conversation with a person on LinkedIn. I told him the clearances of the bearings. Main Bearing Journal Shaft OD is 450 mm Clearance is 0.36 - 0.60 OEM Recommended Big End Bearing Journal OD is 255 mm Clearance is 0.2 - 0.45 mm The person told that this is excessive clearance...

You can clearly see the difference of damage mechanism

2nd damage

1st damage

Also coming to ESD. As in Steam Turbines, ESD can develop due to blades coming in contact with droplets of moisture etc. can electrostatic build up be developed with oil as in crankcase 1/3 portion is filled with oil, and their might be relative motion of crankshaft with oil

When 1st bearing got damaged. The white metal was seen to flow and melted. And this first damage consisted of Grade 2 Babbitt. The crankshaft got damaged also sowe have to replace the crankshaft with new one. Afterwards when new bearings were used the OEM provided us with Grade 3 Babbitt and...

Can you comment on ESD. Can ESD be developed in crankshaft having 75 to 117 RPM. And how can we check ESD without using proximity probes

Sorry for the broken part picture. Now attached is the picture of oil passage. The lube oil pump is gear type and is making enough pressure, we always check the lube oil path and flow before assembling the pump...

Please also comment if ESD can develop on the crankshaft which can deteriorate the Babbitt layer. The RPM of the shaft are 75 normal and Max are 117

The pump is a quintuplex pump having crankshaft with 6 main bearings (sleeve type) and 5 main bearings (sleeve type) lubricated by a lube oil pump.

Attached is the picture of lube oil path https://files.engineering.com/getfile.aspx?folder=0949376a-8e6d-4de6-b615-36781c64872c&file=IMG_20240612_143001.jpg

The Cavitation in reference is in the lubrication oil which is being provided to big end bearings of the crankshaft. It is a recip pump The oil is fed from the lube oil pump to the small end.gudegeoj pin has a hole which aligns with the hole in connecting rod through which oil is supplied to...

thread407-509102 Reference this thread, now we have faced 8th big end bearing failure. Can anyone provide details how Cavitation can be verified if there is any. As the other two pumps has same parameter but failure is being observed only in one Also comment on the Babbitt of the bearings...