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2  To Determine The Carbon Residue In The Given Sample Of Oil @ Www.07 Met.Tk

2 To Determine The Carbon Residue In The Given Sample Of Oil @ Www.07 Met.Tk






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    2  To Determine The Carbon Residue In The Given Sample Of Oil @ Www.07 Met.Tk 2 To Determine The Carbon Residue In The Given Sample Of Oil @ Www.07 Met.Tk Document Transcript

    • Theory
      The percent of coked material remaining after a sample of lubricating oil has been exposed to high temperatures under ASTM D 524 is calle carbon residue. Percentage of the weight of the original sample is expressed as resulte. As far as the affect of residue on performance, one opinion is that the type of carbon is of greater importance than the quantity. Since compounded oils contain metallic additives that generally leave a residue, other testing should be done to also identify the type of residue rather than just the amount.
      The carbon residue of a fuel is the tendency to form carbon deposits under high temperature conditions in an inert atmosphere. It may be expressed as Ramsbottom Carbon Residue (RCR), Conradson Carbon Residue (CCR) or Micro Carbon Residue (MCR). Numerically, the CCR value is the same as that of MCR. The carbon residue value is considered by some to give an approximate indication of the combustibility and deposit forming tendencies of the fuel. It is problematic if greater than 20%.It straight run fuel if 10 to12 %.It is averag if 15 to16%.
      The significance of carbon residue is that fuel with high carbon residue content may cause increased fouling of gas ways in the engine necessitating more frequent cleaning.
      • *Porcelain Crucible
      • *Skidmore Crucible
      • *Chimney wire Support
      • *Sand Bath
      • *Kerosene sample
      1) Weight approximately one gram of oil sample free of moisture and suspend material in crucible.
      2) Place this crucible in the center of skid more crucible Level the sand in sand bath and set skid more crucible on triangle in the exact center of the sand bath.
      3) Apply covers to both skid more and porcelain air crucible. The cover must have the arrangement for the free exist of vapors as they are formed.
      4) Heat with a strong flame from gas burner so that free ignition occurs in 10 minutes and a blue flame appears above the alimony immediately.
      5) Move or tie the burner so that the gas flame plays on the sides of the chimney for the purpose of igniting the vapors. When the vapors cease to burn and no further blue smoke can be observed. Read just the burner and increase the heat so that sand bath sheet is cherry red and maintain for exactly seven minutes. Total period of heating shell be in the range of 28 to 32 approximately.
      6) Remove the burner and allow the apparatus to cool until no smoke appear and then remove the cover of skid more crucible.
      7) Take out the porcelain with tongs place in desiccators. Cool and weigh the crucible. Calculate the percentage of carbon residue in the original sample.
      Crucible Wt. 24.3 g
      Crucible with oil Wt. 47.4 g
      Crucible after evaporation Wt. 24.31 g
      Difference 0.01
      Carbon residue 0.01 g