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

THE EVAPORATOR. 93 Instead of having one large nut as shown, which is bulky in a large coil, the joint may be equally well made with a flange with studs and bolts in the ordinary way. See also Fig. 9a, which makes a good and effective joint. T is the tube or coil expanded in a gun-metal casting, and on each side of “ steam inlet ” a stud and nut will secure all to the evaporator. Fig. 9«. 55. The thickness of the coil is usually from, say, | inch thick in small tubes, to fV inch in tubes of larger diameter. The usual rule is for evaporator tubes to be not less than O' 104 inch thick for tubes of 1 inch bore or under, and not less than 0’128 inch for tubes exceeding 1 inch bore. Although it is often desired to make the bends in the coils as sharp as possible, inch thickness is not perhaps too much to allow for the curving or bending process that the coils have to be subjected to. It is important to remember that the tube of each coil should be one entire piece, and not be made in two or more lengths.