Agitators, helical pipe coils with

It can be seen by comparing T ables 1 and 2 that if mechanical agitation is used and a jacket is desired, then additional internal coils are required. The internal coils can be vertical, like baffles, or helical. Agitation experts state that helical coils can be used with radial turbines if the spaces between the coil loops are 1 to 1.5 pipe diameters, Once helical coils are accepted. Why use ajacket at all Reasons in favor of coils (in addition to the better heat transfer coefficient) are ... 

The mononitrator in a TNT plant consists of a steel tank 6 ft 6 in. in diameter and 5 ft 5 in. high with a flat covered top and a flat but sloping bottom. An agitator consisting of a 24-in. tribladed propeller is centered in the tank. An exhaust system maintains a 2-in. water vacuum to remove fumes. The cooling surface consists of IJ/ -in. steel pipe bent into concentric helical coils. There are five banks of coils. 

---