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

196 SEA WATER DISTILLATION. single distillation to sextuple distillation, the pressures given will be found to work very well. 3. Heating Surface of Boiler. 52. A good boiler maker will allow the correct amount of heating surface for the boiler power required, so that in this respect, and in the arrangement of the flues, a boiler maker's experience will perhaps be amply sufficient to provide for the most economical construction of boiler for the purpose of distillation. If a special kind of fuel other than coal is to be used, such as wood or petroleum, that information will have to be communicated to the boiler maker. 4. Grate Area. 53. The question of grate area is proportionate to the heating surface allowed. Therefore, this matter, as well as the heating surface, is best left to the boiler maker, after notifying to him the evaporative power, and class of fuel to be used. 54. The question of fuel used for generating steam has been dealt with in Chapter v. The grate will vary a good deal in shape and area, according to the description of fuel used. Wood fuel will require a considerably larger grate area than coal, and petroleum would require a furnace specially adapted for its use. Evaporative Power of Boiler. 55. It will be found most convenient, and indeed less likely to lead to a misunderstanding, if the evaporative power required is stated in lbs. of water to be evaporated per hour, and the quantity and temperature of the feed