Paper machine oil (PMO) analysis

Mobil SHC 220 helps Paper mill increase oil drain intervals.

This service monitors paper machine circulation oil for premature wear, contamination and oil condition


This service provides necessary equipment- and lubricant-specific testing designed to help you optimize your lubrication program, as well as detect equipment problems before they cause expensive unplanned outages. Applicable equipment includes dryer bearing lubrication systems, press lubrication systems and Controlled Crown roll systems. This helps improve equipment reliability by monitoring system cleanliness and lubricant performance. 

engine analysis infographic
PMO infographic
Test Purpose Importance of test
Metals To determine the presence and levels of metallic content in the oil, including contaminants and wear particles The level of metals helps determine if equipment components are wearing or if harmful contamination is entering the oil. The level of metals that are part of the additive chemistry are also reported
Oxidation To determine the level of lubricant oxidation and deterioration

Oxidation can mean:

  • Increased wear and corrosion
  • Shorter equipment life
  • Increased viscosity
  • Excessive deposits and plugging
Particle Count Analysis To measure the level of particulate contaminants in the oil
  • Cleanliness is a critical factor in the running of hydraulic and circulating oil systems
  • Debris can interfere in the fine tolerances of the system’s pumps and valves or cause premature wear
Particle Qualification (PQ) Index To determine ferrous metal fatigue failures and metal-to-metal contact not usually detectable with some spectrographic analysis PQ Index can detect at an early stage:
  • Anti-friction bearing wear
  • Plain bearing wear
  • Gear wear
Total Acid Number (TAN) To measure acidic oil oxidation by-products An elevated Total Acid Number may indicate increased oil acidity resulting from increased oil oxidation
Total Base Number (TBN) To determine the reserve alkalinity of the oil used to neutralize the formation of acids A decrease in Total Base Number may be indicative of:
  • Oil degradation caused by rapid acid formation due to changing fuel characteristics or a high rate of oil oxidation
  • Decreased acid-neutralizing reserve
Viscosity To determine the oil’s resistance to flow
  • An increase in viscosity may be due to high soot or insoluble content, water contamination, or admixture with higher viscosity fuel or lubricant
  • A decrease in viscosity may be due to water contamination, or admixture with lower viscosity fuel or lubricant
  • Both high or low viscosity may result in premature equipment wear
Water To detect presence of water contamination Water contamination may cause severe corrosion and subsequent wear, poor oil film thickness or hydrogen embrittlement