- Two journal bearings one on the turbine side and one on the compressor side support the weight of the rotor and provide lubrication as well as vibration inhibition.
- A thrust bearing with 2 forward and aft faces is also fitted on the compressor side on either side of a thrust collar.
- The lubricant is externally supplied to the turbo charger at specific temperature and pressure by the turbo charger LO pumps.
- The LO header tank is fitted on top to provide lubrication in case of sudden engine stop or blackout.
- Oil labyrinth and gas labryinths are provided on both sides to prevent leakage
Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole is lesser in size than the corresponding circular hole. More over it is prime concern to have a smoothed generous radius at the corners to eliminate stress concentration. Hence other geometrical shapes like rectangle and square are ruled out. To compensate for the loss of material in the shell due to opening, a doubler ring has to be provided around the opening. The thickness of the ring depends on the axis length along the dirrection in which the stresses are maximum and the thickness of the shell. It is important to align the minor axis along the length of the vessel, as the stress in this direction is maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t= thickness of the shell plating Circumferential stress: Pd/4t More over a considerable material and weight saving is achieved as minor is along the direction of maximum stress.