PQ – Measuring abnormal sized ferrous / iron wear particles in lube oils

PQ PQ   Measuring abnormal sized ferrous / iron wear particles in lube oilsPQ – this is a non-dimensional value indicating the amount of ferrous (i.e. Iron, Steel, Cobalt or Nickel – magnetic) material in the sample. Standard Iron results are performed by ICP (Inductively coupled plasma) and measures particles ideally less than 5 to 10µm. By comparison the width of a human hair is 80µm. Therefore large ferrous particles that can be seen by eye will be underestimated by ICP. Hence the PQ method detects small and large particles.

 

 

 

Common Causes Potential Result Potential advice
High PQ result compared to Iron ICP result Abnormal wear processes:

  • Abrasive contaminants
  • Misalignment
  • Overloading
  • Poor lubrication
  • And many more.
  • Machine failure
  • Reduced component life
  • Loss of production
 Further investigation of oil/filter by laser net fines or ferrography to determine cause

word image 1 PQ   Measuring abnormal sized ferrous / iron wear particles in lube oilsPQ vs iron PQ   Measuring abnormal sized ferrous / iron wear particles in lube oils

Find out how wear metals, ferrous debris, contamination elements, wear particle quantification index (PQ / PQI) and additive metals are tested below, what each element on a report means and how to diagnose which components on failing. Then test what you learn in our test your knowledge quiz below.

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ICP elemental analysis quiz

This is a quiz on elements measured by icp in lube oils.