Centrifugal Discharge Type

In case of centrifugal discharge type the load is thrown ont of the buckets by centrifugal force as they pass over the upper wheel. These can be used for almost any material that can get freely discharged from the buckets. 

ScroU centrifuges discharge soHds continuously and usuaUy drier than disk and imperforate batch types. GeneraUy disk centrifuges have the highest values of Z or for a given size and therefore the best abUity to coUect fine particles at a high rate. 

Spaced-Bucket Centrifugal-Discharge Elevators These elevators (Fig. 21-5<7) are the most common. They are usually equipped with the style 1 or 2 buckets shown in Fig. 21-5/j. Mounted on a Belt or a chain, the buckets are spaced to prevent interference in loading or discharging. This type oi elevator will handle almost any free-flowing fine or small-lump material such as erain, coal, or dry chemicals. Buckets are loaded partly by material flowing directly into them... 

Spaced-Bucket Positive-Discharge Elevators Elevators of this type (Fig. 21-5b) are essentially the same as centrifugal-discharge units except that the buckets are mounted on two strands of chain and are snubbed back under the head sprocket to invert them for positive discharge. These units are designed especially for materials which are... 

There are four basic types of bucket elevators centrifugal discharge, positive or perfect discharge, continuous bucket, and supercapacity. These are shown in Fignre 11-4 and are described in the following paragraphs. 

From the degassing area discharge, each fuel stream flows to the suction of a variable speed centrifugal sump type pump. Each pump is designed to deliver about 9000 gpm at 20-ft head of pumped fluid. To obtain a reasonable pump speed, the net positive suction head requirement is 11.5 ft. A gas pressure (helium) is maintained o er the pump sump to prevent flooding of upper parts (motor windings, cooling system, etc.) of the pump. 

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