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Test Your Knowledge: Boiler Blowdown

Why do we surface blowdown?

          A. To remove the dissolved solids that have concentrated in the boiler due to evaporation

          B. To remove condensate as rapidly as possible to eliminate water hammer

          C. To increase pressure of hot water and heat to generate increased flash steam

          D. To reduce the heat of vaporization of water molecules before they convert to steam


The answer…

      A. To remove the dissolved solids that have concentrated in the boiler due to evaporation


How Does Blowdown Affect the Plant?

Too Much Blowdown

  • Increased fuel costs
  • Increased water costs
  • Increased chemical costs

Too Little Blowdown – High TDS will occur resulting in:

  • Foaming
  • Priming
  • Corrosion
  • Scale

Energy Savings – Blowdown Heat Recovery

  • Blow down is 5-10% of boiler capacity
  • Recovery systems can capture steam that would normally be vented
  • Pre-heat make up water
  • Reduces water usage to cool the blow down prior to the drain


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952-935-2345  address15350 Minnetonka Blvd., Minnetonka, MN 55345

Products We Carry

  • Hot Water Boilers
  • Watertube Steam Boilers
  • Firetube Steam Boilers
  • Deaerators
  • Heat Recovery Steam Generators (HRSG’s)
  • Automatic Recirculation Valves
  • Economizers
  • Gas-Fired Water Heaters
  • Gas-Fired Humidifiers
  • Boiler/Generator Flue Stacks
  • Continuous Emissions Monitors (CEMS)
  • Pressure Reducing Valves
  • Safety and Relief Valves
  • Control Valves
  • Pressure Independent Control Valves
  • Expansion Joints, Guides, Anchors
  • Flash Tanks
  • Flow Meters
  • Balancing Valves
  • Check Valves
  • Separators
  • Pumps
  • Pressure Booster Systems
  • Piston Valves
  • Heating/Cooling Coils
  • Plate and Frame Heat Exchangers
  • Shell and Tube Exchangers
  • Water Heaters
  • Steam Humidifiers
  • Vacuum Systems
  • Condensers
  • Steam Traps
  • Wireless Steam Trap Monitors
  • Tube Bundles
  • Direct Gas-Fired Space Heaters
  • Direct Gas-Fired Make-Up Air Units
  • Unit Heaters
  • Strainers
  • Air Vents
  • Liquid Drainers
  • Heat Transfer Packages
  • Digital Water Mixing Valves
  • Air Cooled Condensers/Dry Coolers
  • Steam Filters
  • Electric Condensate Pumps
  • Steam/Air-Powered Condensate Pumps
  • Packaged Condensate Pump Skids