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Iso grade viscosity downgrade in a bambury gearbox

Ariel Hernandez
Ariel Hernandez

The document compares the viscosity and viscosity index of an ISO 320 mineral oil and an ISO 220 polyalphaolefin (PAO) oil for use in a gearbox. Graphs show the mineral oil maintains a higher viscosity at lower temperatures, but the two oils have similar viscosity curves at higher operating temperatures above 40属C. An analysis of variance could provide more clarity on differences in viscosity. While the OEM recommends the higher viscosity mineral oil, a downgrade to the PAO oil may allow energy savings without compromising equipment life, based on the similar viscosity curves in the operating temperature range.

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ISO Grade Viscosity downgrade in a Bambury gearbox. Viscometric analysis. Mineral Oil ISO 320 vs PAO Oil ISO 220 "The Polymer" taken from DeviantArt
Considerations OEM Recommendation: ISO 320 Mineral Gear Oil. VI 98. Alternative: ISO 220 PAO Gear Oil. VI 155. "The Polymer" taken from DeviantArt
Viscosity cSt vs Temp 属C 10000.0 9000.0 8000.0 7000.0 6000.0 Viscosity cSt 5000.0 4000.0 3000.0 2000.0 1000.0 0.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 Temperature 属C "The Polymer" taken from DeviantArt p Min ISO 320 p PAO ISO 220
Sometimes, tweaking the numbers (log10) helps to visualize the data.. I am Afraid this case not much 財 R2 might be better, but it is not too bad. Log10 Viscosity vs Temp C 4.5 4 3.5 R族 = 0.971 3 Log10 Viscosity cSt 2.5 R族 = 0.977 2 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 log MIN log PAO Lineal (log MIN) Lineal (log PAO) "The Polymer" taken from DeviantArt
Well, we can see in the graphs the different behaviour of the fluids when heat affects them, at low temp, there is a wide gap between the lines, nevertheless, at high temps, the curves get along each other. Let卒s look at temps above 40 属C Viscosity cSt vs Temp 属C 400.0 350.0 300.0 250.0 Viscosity cSt 200.0 150.0 100.0 50.0 0.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 Temperature 属C p Min ISO 320 p PAO ISO 220 "The Polymer" taken from DeviantArt
It is a little bit hard to tell any significative differences, don卒t you agree? Let卒s see now what the logs say about: Log10 Viscosity vs Temp C 2.6 R族 = 0.989 2.4 2.2 R族 = 0.992 Log10 Viscosity cSt 2 1.8 1.6 1.4 1.2 1 40 50 60 70 80 90 100 Temp 属C log MIN log PAO Lineal (log MIN) Lineal (log PAO) "The Polymer" taken from DeviantArt
Conclusions: I think that an ANOVA exercise might clarify a little bit more if are there, or not, any significative differences between the 2 fluids @ operation temperature. As stated before, if the additive chemistry (and the base fluid nature) has been chosen, I certainly would trust in calculations like this to support a project involving an ISO viscosity grade downgrade, from mineral to Synthetic in order to achieve energy savings, without a negative compromise to the equipment remaining life. Any comment, shall be received gladly: ariel.hernandez@terra.com.mx "The Polymer" taken from DeviantArt

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Iso grade viscosity downgrade in a bambury gearbox

  • 1. ISO Grade Viscosity downgrade in a Bambury gearbox. Viscometric analysis. Mineral Oil ISO 320 vs PAO Oil ISO 220 "The Polymer" taken from DeviantArt
  • 2. Considerations OEM Recommendation: ISO 320 Mineral Gear Oil. VI 98. Alternative: ISO 220 PAO Gear Oil. VI 155. "The Polymer" taken from DeviantArt
  • 3. Viscosity cSt vs Temp 属C 10000.0 9000.0 8000.0 7000.0 6000.0 Viscosity cSt 5000.0 4000.0 3000.0 2000.0 1000.0 0.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 Temperature 属C "The Polymer" taken from DeviantArt p Min ISO 320 p PAO ISO 220
  • 4. Sometimes, tweaking the numbers (log10) helps to visualize the data.. I am Afraid this case not much 財 R2 might be better, but it is not too bad. Log10 Viscosity vs Temp C 4.5 4 3.5 R族 = 0.971 3 Log10 Viscosity cSt 2.5 R族 = 0.977 2 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 log MIN log PAO Lineal (log MIN) Lineal (log PAO) "The Polymer" taken from DeviantArt
  • 5. Well, we can see in the graphs the different behaviour of the fluids when heat affects them, at low temp, there is a wide gap between the lines, nevertheless, at high temps, the curves get along each other. Let卒s look at temps above 40 属C Viscosity cSt vs Temp 属C 400.0 350.0 300.0 250.0 Viscosity cSt 200.0 150.0 100.0 50.0 0.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 Temperature 属C p Min ISO 320 p PAO ISO 220 "The Polymer" taken from DeviantArt
  • 6. It is a little bit hard to tell any significative differences, don卒t you agree? Let卒s see now what the logs say about: Log10 Viscosity vs Temp C 2.6 R族 = 0.989 2.4 2.2 R族 = 0.992 Log10 Viscosity cSt 2 1.8 1.6 1.4 1.2 1 40 50 60 70 80 90 100 Temp 属C log MIN log PAO Lineal (log MIN) Lineal (log PAO) "The Polymer" taken from DeviantArt
  • 7. Conclusions: I think that an ANOVA exercise might clarify a little bit more if are there, or not, any significative differences between the 2 fluids @ operation temperature. As stated before, if the additive chemistry (and the base fluid nature) has been chosen, I certainly would trust in calculations like this to support a project involving an ISO viscosity grade downgrade, from mineral to Synthetic in order to achieve energy savings, without a negative compromise to the equipment remaining life. Any comment, shall be received gladly: ariel.hernandez@terra.com.mx "The Polymer" taken from DeviantArt