Boiler Blowdown Tanks are used to control blowdown of a boiler so that the level of dissolved solids is minimized to reduce scaling in the boiler. These boiler blowdown tanks also enable high-pressure water to safely flash to steam. The amount of blowdown necessary depends on boiler operating pressure, amount of makeup water, impurity levels in the makeup water, and the dissolved solids concentrations that a given boiler can tolerate. The process of removing this water is referred as Boiler Blowdown.

As blowdown water has the same temperature and pressure as the boiler water, local laws usually do not permit this high temperature and pressure water to be discharged into the sewer. An acceptably designed blowdown tank system reduces the temperature by mixing cold water with the effluent.

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