Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2080 d
1420 d
1680 d
2840 d

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Machine Design
In hydrostatic bearings

The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
Do not require external supply of lubricant
The Oil film pressure is generated only by the rotation of the journal

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