Common Heat Transfer Fluid Problems: Contamination

Problem: Contamination

Contamination occurs in a heat transfer system when a something other than the heat transfer fluid is introduced into the system, potentially causing wide variations in the properties of the original fluid. Common fluid contaminants include water and used heat transfer fluids. 

Cause: 

• Pipe/vessel leaks may cause contaminants to enter into the heat transfer fluid, accelerating fluid degradation
• Contaminant may get into the expansion tank
• Poor drainage and flushing of previously degraded heat transfer fluid before replacement with new fluid 
  
  

Consequence:

• Rapid fluid degradation
• Corrosion
• Pump cavitation
• Adverse effects on fluid viscosity, volatility and heat transfer efficiency

Solution: 

• It is important to ensure that used fluids are completely flushed before charging a system
• Heat transfer equipment with water as an operational fluid must be inspected regularly for leaks
• Properly storing heat transfer fluid containers reduces the risk of contamination or the fluid before use