Blow Down Vessels

Engineering Equipment India has designed, manufactured and supplied more than 150 blowdown vessels to our national and international customers.

Purpose of Blowdown Vessel

Blow down tanks are a crucial part of every boiler system. Blow down tanks are designed to solve the problem of boiler water impurities.  Blow down tanks removes the sledges in the bottom of  boiler  drum by blowing down.

Solids also may settle to the bottom of the boiler drum to form sludge. These sledges are removed by blowing down once in a shift. Since this water contains a lot of impurities the same cannot be reused. The blowdown water is a mix of saturated steam and water.

Boiler water treatment often leads to the formation of solid particles that are initially suspended in the boiler water. Solids concentrated in boiler water tend to promote foaming and scaling with a resultant loss of heat transfer, which may result in overheating of the boiler and super heater tubes.

Blowdown Vessel Design

The design of vent is very important in the Blowdown vessel. The vent of blow down vessel is open to the atmosphere, to avoid flashing in the atmosphere, the vent is designed for a larger diameter.

Blow down vessels retain the blow down water volume from one blow after the flash steam has been vented to the atmosphere and allow the water to cool down by natural convection over 6-12 hour period. The cooled water will be below 140° Fahrenheit when it is displaced by the next blowdown and forced out of the overflow drainpipe.

Water blow down is performed continuously to reduce dissolved solids and bottom blow down is used periodically to clean out the sludge on the bottom of the boiler.

Due to blow down tank, the boiler stays clean and operates at maximum efficiency.

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Steam water mixture flow, pressure, temperature