Blowdown expansion vessels BV

The BV expansion and blowdown cooling tank is used in modern boiler rooms to cool steam boiler blowdowns before they are discharged to the general drainage system. The boiler blowdowns are discharged into the expansion tank BV at atmospheric pressure and are cooled by the supply of cold water through a thermostatic control valve which is controlled by the corresponding thermostat mounted inside the tank. If the flash steam that is generated cannot be recovered or is discharged into the environment, an additional water spray system can be installed inside the BV tank.  This is mounted on top of the unit and can be controlled directly by another thermostat or by the same control that activates the automatic sludge purge.