A flash tank serves as a collection system for a variety of condensate drain lines. Flash tanks receive high pressure condensate which is then exposed to a low pressure steam source. When this occurs, a certain percentage of condensate will “flash” to steam at the lower pressure. This steam can be "recycled" on other low pressure steam heat transfer devices. Smaller in size than traditional flash tanks, flash separators utilize cyclonic action to instantly separate steam and condensate.
Level measurement is necessary to control flash tank level. The challenges are elevated temperatures and pressures.