What causes heat transfer oil (hot oil) to deteriorate?

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What does hot oil deterioration mean? 

  

What is hot oil and why it deteriorates? 

          Hot oil is a specialized oil used in the heat transfer systems of an industrial machine. Its main role is to efficiently transfer heat from the source to the required components. However, over time, hot oil can degrade, reducing its heat transferring ability and causing carbon deposits to build up within the system. This buildup can lead to equipment damage and higher maintenance costs. 

  

Deterioration of the hot oil can be caused by two main factors. 

1. Oxidation 

As hot oil used in an open system is exposed to oxygen and moisture in the air, oxidation may occur and result in: 

  • Increase in oil viscosity 

  • Dirt and deposits accumulation within the oil 

  • Sludge build-up in pipes and equipment within the system 
     
     

2. Thermal Cracking 

If the hot oil is overheated, the oil molecules may break down, causing: 

  • Decrease in oil viscosity 

  • Decrease in oil flash point which can induce higher risk of ignition 

  • Sludge build-up in the system, reducing the heat transferring ability 

  

How to prevent hot oil premature deterioration? 

To extend the service life of the hot oil and maintain the efficiency of the heat transfer system, it is recommended to: 

✅ Avoid using the oil at temperatures above the specified level 

✅ Regularly check and maintain the system to ensure proper oil circulation 

✅ Use high-quality hot oil that is resistant to oxidation and heat 

✅ Regularly inspect the oil quality (at least once a year) to evaluate the deterioration 

  

HITEMP 600LT, the ultimate solution in preventing oil deterioration 

          PTT Lubricants proudly presents HITEMP 600LT, a high quality synthetic heat-resistant transfer oil formulated with Alkyl Benzene. Enhanced with antioxidant additives, it offers superior heat resistance and an extended service life. 

 

Applications of HITEMP 600LT 

  • Recommended for closed heat transfer systems in general industries with operating temperatures not exceeding 280 degrees Celsius. 

Superior Properties of HITEMP 600LT 

  • Offers high heat resistance while maintaining stability against molecules breakdown 

  • Has low evaporation rate and high flash point, ensuring smooth flow 

  • Resistant to oxidation 

  • Nonreactive to metal 

  • Reduces soot formation 

  

          Choosing a high-quality heat transfer oil (hot oil) while regularly maintaining the system can enhance efficiency, prolong oil degradation, and reduce long-term costs. For more information on HITEMP 600LT, please do not hesitate to contact PTT Lubricants Team right away! 

 

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