In this chapter, we have discussed two types of low-pressure distilling plants: the submerged-tube unit and the flash-type unit. You should be able to identify the individual components of these distilling plants and how they contribute to the overall process of distillation. As an Engineman, you should be able to identify the ways in which these plants differ. You should also be able to identify the requirements that the distillate must meet for it to be usable. If you are unclear in any of these areas, go back and review this chapter before continuing to chapter 16.

Figure 15-9.-Submerged tube, heat recovery distilling plant, 4,000 gpd capacity.

Figure 15-11.-Two-stage, flash-type distilling plant, 12,000 gpd capacity.