(under the class definition) Apparatus in which the liquid undergoing treatment is evaporated in both closed and open pans at substantially equal pressure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2.1+, for evaporators employing superheating and pressure release.
18, for superimposed multiple effect evaporators.
19, for combined open and closed pans in which the evaporation is at unequal pressure.
