DSEAR / ATEX legislation - thermal fluid systems and representative fluid analysis

Atex 640

Thermal fluids can become volatile and hazardous, resulting in an explosive atmosphere, if conditions are allowed to deteriorate:

  • If there is a loss of containment or a fluid leak 

  • Resulting hydrocarbons are released as vapour - these represent the most volatile offshoot of the product (known as the light ends) 

  • A leak may produce an ‘aerosol’ of finely divided material - the greater the pressure, the higher the risk

  • The risk increases when thermal fluid has degenerated and flashpoints, boiling points and auto ignition temperatures have reduced - the lower the flashpoints, the higher the risk

  • The hotter the system bulk fluid temperature, the higher the risk