Skip to main content

medium speed engine

   MEDIUM SPEED ENGINE  

  •     Such engines  are running in between (250-850) rpm and above this range are defined as HSE (high speed engine).

  •      Mostly Auxiliary engines are medium speed engine and alternator is coupled with it and is used for electrical power generation.

  •      Low weight of engine and  reduced space requirement( turbocharger has reduced the space of E/R by 30% and 300% by weight w.r.t slow speed engine and less machinery weight is helpful stabilizing trim)

  •        Low head space (provides continuous deck by shipbuilder which helps in cargo carriage , layout of control room , auxiliary engine ,stores)

  •     Speed of engine and propeller is independent to each other hence best design speed can be selected for both. A free selection of rpm of propeller can increase its efficiency.

  •      The same engines can be used for various other duties like driving alternator and cargo pump in ports.

  •    Spare parts are cheap and very easy to handle store and transport. 

  •    Disadvantages of it (more lubricating oil consumption, short service life of exhaust valve, more maintenance work, high load on bearing requires more attention and replacement, high level of noise).


Labels:

Comments

Post a Comment

Popular posts from this blog

Wire drawing effect

Wire drawing effect : It is erosion or scoring of valve seat and disc material of the valve . Causes : 1. Due to differential pressure across the valve . 2. Thermal and mechanical damages . Effects : Valve is unable to isolate the line and fails in sealing . Gas and liquid will leak from the wire and scratch like groove .
Post a Comment
Read more

Cross and loop scavenging Disadvantage

Cross scavenging Disadvantage 1. It requires longer  piston skirt to prevent exhaust gas and air leaks from the ports when piston is at TDC . Loop scavenging Disadvantage 1. Both exhaust port and scavenge port are at the adjacent side of the liner which causes temperature differential problem for the liner material . Hence , we are using mostly the uniflow scavenging which is having very lesser mixing and better scavenging efficiency. Source : DA Taylor
Post a Comment
Read more