4.9 - Explosions

In the chapter 4.9 it’s treated the argument of explosions and the standard reports the following prescriptions:

“Spray booths shall be equipped with forced ventilation to limit the concentration of flammable substances below the specified percentage of LEL.

The required air flow shall be monitored.

 

An interface shall be provided to enable the interlocking of the forced ventilation with

• The spray application and
• The high voltage supply of electrostatic application equipment

The standard imposes the limit concentration values of flammable substances for explosive protection:

• For spray booths for liquid coating material, the flammable substances concentration shall be limited to 50% of LEL for automatic spray booths and 25% of LEL for manual spray booths.
• For spray booths, the flammable substances concentration shall be limited to 50% of LEL.

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