• Reduction of the operating period
  = Production losses
  
• Fouling in convection heating surfaces "plasters up"
• Temperature limits for filter installations
  
  
• Reduction of the life time of the 1st superheater
  
• High temperature corrosion
  
  
• Reduction of effeciency
  
• Spraying quantities up to the limit
• Increasing of flue gas temperatures
• Lost capacity

Parameter for cleaning effectiveness:

• amount of water on boiler wall
  
• diameter of water jet on boiler wall
  
• speed of water jet on boiler wall
  
• angle of the hitting water jet
   
• situation of slagging
• sealed surface (like glass)
• "open" surface