Boiler Blowdown Tanks
ASME blowdown tanks for boilers are used as an alternative system for cooling the bottom boiler blowdown. These large tanks retain the blowdown 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.
Shell length and connections size dimensions can be changed to meet the application requirements for the specific boiler as determined by design rule calculations.
Sizing of tank and connections should be determined using National Board design rules for blowoff tanks.
Contact the factory for assistance.
Data required for sizing calculations:
- Blowdown pipe size, type and equivalent length to tank.
- Boiler steam drum diameter & length.
- Boiler operating pressure