A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

I i 6 SEA WATER DISTILLATION. reclaimed, and thus be used for heating the feed-water. It is, however, advisable not to allow these distiller tubes to do too much heating work, for by taking the circulation water from too low a point the upper part of the distiller tubes will get covered with scale to an objectionable extent. 107. Fig. 13 explains the first method of heating the feed-water by means of the secondary steam. It will be Fig. 13. seen that the outlet circulation water is discharged at lower (C), a point rather lower down than (F), at which the feed-water is taken. The result of this is, that a body of circulation water is held up at (H), between (F) and (C), and there continues to receive more heat from the secondary steam entering at (S) than is imparted to the bulk of the circulation water that escapes at upper (C). This extra heating of the circulation water at (H) causes the tubes (T) to become more covered with scale than would happen lower down in the sheaf. This method is,