Field inspection

Team Minimac

Feb 24, 2022 ยท 2 min read

1) Visual Inspection of Oil in a Sample Bottle:

  • Colour: wrong or mixed oil, photo-catalytic reaction, oxidation and thermal degradation, soot, chemical contamination
  • Emulsions and Cloudiness: haze to buttermilk, cuff, stable or unstable, additive floc, salt, air, glycol
  • Free Water: colour, speed of separation, level
  • Sediments โ€“ colour: amber, black, translucent, settling rate, density and particle size, laser through the bottle

2) Using Oil Colour as a Field Test:

  • You can check the colour of the oil sample with the help of an oil change colour gauge by using glass or PET plastic bottles
  • Without a gauge, you can compare the sample with a new oil sample and observe the colour, if you find that colour of the oil is milky or dark, then check the contamination & moisture in oil with the help of an Oil testing kit

3) Moisture Detection by Vision:

  • Visual inspection
  • Transparent container
  • Use comparators and good lighting, laser pointer is also effective
  • Hazy to milky appearance may indicate water emulsion

4) Routine Inspection of Sight Glasses in Oil Analysis:

  • Change in oil level โ€“ up or down, sudden and significant changes are serious
  • Sight glass foaming
  • Oil colour, darkening, turbidity, etc.
  • BS& W bowl shows oxidised oil
  • Use a blue pen-light for checking the oil level and quality insight glasses

5) Other Audible Inspection:

  • Gearing โ€“ A singing gear is a happy gear, usually, it means it is one that is hitting
  • Hydraulics โ€“ High metallic sounds from pumps means there is water in oils
  • Marbles on the tin roof mean cavitation

6) Using your Sense of Touch:

  1. Lube: Oils should feel slippery, not clingy. Greases should feel buttery, not stringy or lumpy
    - Grease consistency can be estimated manually with a butter knife, you can tell the difference between #2 and #3
  2. Contaminants โ€“ Sludge: hard, pasty, sticky
    - Particles / Sediments
    - Filter debris

7) Using Oil Odour as a Field Test:

Purpose quickly detect odour โ€“ Producing changes in an oilโ€™s chemistry and constituents. For best results with scenting, use comparators for examples, bottles of new oil, oxidised oil, burnt oil, diesel contaminated oil, etc.

Also read:

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