Lubrication oil properties of refrigeration compressor and how will you select REFRIGERANT? MEO CLASS4 ORALS

By -

 Lubrication oil properties of refrigeration compressor?

  • Should have low floc point 
  • Should have low pour point.
  • Should not react with REFRIGERANT
  • Stability
  • Defoaming character.
  • Dielectric strength.


How will you select REFRIGERANT ?

  • High critical temperature
  • Low critical PRESSURE
  • Latent head of vaporization
  • Eco friendly.



Comments

Post a Comment

Popular posts from this blog

STIFF SHIP AND TENDER SHIP and Difference between stiff and tender ship.

By -
Image
Stiff ship and tender ship     STIFF SHIP When a metacentric height and righting lever distance is large, Ship have excessive stability Ship will come to its normal upright position very quickly when its heeled. Tender ship When metacentric height and righting lever distance is very small.  Ships have less stability Ship will come to its  normal  upright position very slowly when its heeled. DIFFERENCE BETWEEN STIFF SHIP & TENDER SHIP?
Read more

SOLAS CHAPTER 11.1 SPECIAL MEASURES ENHANCE TO MARITIME SAFETY (MEO CLASS4)

By -
SOLAS - 11.1  SPECIAL MEASURES ENHANCE TO MARITIME SAFETY                           IMO NUMBER & CONTINUOUS SYNOPSIS RECORD IMO NUMBER APPLY TO          cargo ship of 300 GT and above,      passenger ship of 100 GT and above, SHIP IDENTIFICATION NUMBER:   the number consists of seven digits assigned by IHS maritime, the label begins with the letters  "IMOxx00xx0"  once assigned the number will not changed,      permanently marked     visible in color      outside diameter  not less than 200mm     inside diameter not less than 100mm     width should be proportional to height. LOCATION OF IMO NUMBER MARKED IN SHIP   highly visible area sides of hull (port,stbd) mid ship super structure  CONTINUOUS SYNOPSIS RECORD Ship history book is a permanent record kept in a ship always. and shall be available for the inspection  it contains name of the ship the port at which the ship is registered  date of registered  flag state name  name of the charterers name of the classification s
Read more

BOILER ALARMS AND TRIPS

By -
Image
MEO CLASS 4 BOILER ALARMS AND TRIPS MMD ORAL Low water level alarm - ⏰ Alarm Low low water level alarm - ⏰ Alarm / Trip High water level alarm -  ⏰ Alarm High High water level - ⏰ Alarm / Trip Low fuel oil pressure - ⏰ Alarm Low steam pressure - ⏰ Alarm High steam pressure - ⏰ Alarm / Trip Low fuel oil temperature - ⏰ Alarm High fuel oil temperature - ⏰ Alarm Flame failure - ⏰ Alarm / Trip Burner not in starting fire position - ⏰ Alarm / Trip Low combustion Air pressure - ⏰ Alarm / Trip
Read more