Skip to main content

The most critical time for any bearing with regards to lubrication

  •  Most of the bearings used on the engines work on the principle of hydrodynamic lubrication. 
  • During hydrodynamic lubrication, there is no metal-to-metal contact between the bearing and the shaft. The bearing and shaft is separated by lubricating oil film. 
  • This oil film is formed due to the rotation of the shaft inside the bearing. As the speed of the shaft increases, more oil is drawn between the shaft and the bearing and thicker lubricating oil film is formed. 
  • During starting of the engine, the speed is very low. Hence it is difficult to form a hydrodynamic lubrication between the shaft and the bearing. 
  • During this time, for a short period, there is metal-to-metal contact between the shaft and the bearing surface. 
  • Hence this is the most crucial period as the characteristics of the lubricating oil (oiliness) comes into use and this is time when more wiping out of the bearing takes place. 
  • Hence it is necessary to coat the bearings with anti-friction material to reduce the friction between the bearing and the shaft at the time of starting because once the engine is started and the engine has achieved the speed, the white metal does not play an important role because there is no metal-to-metal contact and it is pure hydrodynamic lubrication. 
  • Hence white soft coating is useful for the boundary lubrication which is existing at the time of starting the engine.
Labels:

Comments

  1. aesteironMarch 18, 2021 at 11:02 PM

    This blog is really helpful to deliver updated affairs over internet which is really appraisable. Carbon Steel Pipe suppliers

    ReplyDelete
  2. Roopam SteelMarch 18, 2021 at 11:52 PM

    I found one successful example of this truth through this blog. I am going to use such information now. stainless steel pipe suppliers

    ReplyDelete
  3. highpressurepipefittingsMarch 19, 2021 at 1:05 AM

    I got some valuable points through this blog. carbon steel pipe fittings manufacturers

    ReplyDelete
  4. Oil And Gas Piping MaterialsMarch 19, 2021 at 2:32 AM

    Share great information about your blog , Blog really helpful for us . Api 5l Grade B

    ReplyDelete
  5. Steel Pipe FittingsMarch 19, 2021 at 3:22 AM

    Thanks for share your blog here . carbon steel pipe fittings manufacturers

    ReplyDelete
  6. rajtilakmetalMarch 19, 2021 at 4:06 AM

    It is really a helpful blog to find some different source to add my knowledge. stainless steel pipe fittings manufacturers

    ReplyDelete

Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators
9 comments
Read more

Main engine interlocks

Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation...
7 comments
Read more

Why is a man hole door elliptical in shape?

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...
20 comments
Read more