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# Boiler Blowdown Rate

## Calculate boiler blowdown rate.

A blowdown of the boiler is a routine operation necessary due to the increased concentration of Total Dissolved Solids - TDS - in the boiler water when producing steam.

The blow down rate of a boiler depends on

• steam consumption (steam used in the process and not returned as condensate to the boiler)
• concentration of impurities in the feed water
• maximum allowable TDS in the boiler

The blowdown rate can be calculated as

qBD= qS fc / (bc - fc)                                        (1)

where

qBD = blowdown rate (kg/h)

qS = steam consumption (kg/h)

fc = Total Dissolved Solids - TDS - in the feed water (ppm)

bc = maximum allowable Total Dissolved Solids - TDS - in the boiler water (ppm)

## Related Topics

• ### Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

## Related Documents

• ### ASME - International Boiler and Pressure Vessel Code

The International Boiler and Pressure Vessel Code safety rules governing design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction.
• ### Boiler Blowdown

Suspended solids in the feed water will remain in the boiler when steam is generated.
• ### Boiler Capacities

Steam boilers output can be expressed in Boiler Horsepower, MBTU or in Pounds of Steam delivered per hour.
• ### Boiler Feed Water - Chemistry and Impurity Limits

ABMA recommended feed water chemistry limits for steam boilers.
• ### Boiler Water - Total Dissolved Solids (TDS)

Impurities from the feedwater will concentrate in the boiling water.
• ### Boilers - Classification

Classification of boilers according the ASME Boiler and Pressure Vessel Code.
• ### Feed Pumps in Steam Systems - Suction Lift Head vs. Temperature

Cavitation of impellers increases with water temperatures.
• ### Feed Water Treatment to Avoid Corrosion

Make-up water to steam boilers should be treated with oxygen scavengers to avoid serious corrosion problems.
• ### Steam Boiler Rating vs. Feed Water Temperature

Boiler output vs. feed water temperature.
• ### Steam Boiler Shells - Stress vs. Boiler Pressure

Calculate the stress in steam boiler shells caused by steam pressure.

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## Citation

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• The Engineering ToolBox (2008). Boiler Blowdown Rate. [online] Available at: https://www.engineeringtoolbox.com/blow-down-rate-d_1063.html [Accessed Day Month Year].

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6.3.17

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