Process Engineering Equipment Handbook
This is an illustrated guide to the major equipment found in chemical process plants, for engineers charged with operating, specifying and performing basic troubleshooting on the equipment in their environment.
TABLE OF CONTENTS Process Engineering Equipment Handbook
F
Fans, Centrifugal
Besides being used in process plants, centrifugal fans are common in building heating and air-conditioning systems. Vendors for these systems should be consulted for required options.
Types of Fans [*]
Three types of centrifugal fans are available: (1) forward curved blade fans, (2) radial blade fans, and (3) backward curved blade fans. The characteristics of the forward curved blade fan make it the most appropriate type of cooling tower service. By virtue of the direction and velocity of the air leaving the fan wheel, the fan can be equipped with a comparatively small size housing, which is desirable from a structural standpoint. Also, because the required velocity is generated at a comparatively low speed, forward curved blade fans tend to operate quieter than other centrifugal types. Table F-1 lists some typical fan installations. Note the relatively small rpm and head values. See also Figs. F-1 through F-4. The envelopes on the head versus volume curves each indicate a separate fan model is available.
| Customer | Plant | Year | Application | Model Number Size Width | Wheel dia (mm) | Flow (m 3/sec) | Head (mmwg) | BHP (kW) | rpm |
|---|---|---|---|---|---|---|---|---|---|
| ENEL | Termini Imerese 3 4 | 1971 | GR | 4-1013 SWSI | 2,946 | 106 | 447 | 658 | 735 |
| TAVANIR | Esfahan 1 2 (Iran) | 1977 | FD | 4-23120 DWDI | 3,230 | 200 | 1,428 | 3,176 | 990 |
| ENEL | Porto Tolle 1 4 (Italy) | 1977 | GR | 8-1012 DWDI | 2,964 | 187 | 385 | 1,765 | 990 |
| TAVANIR | Esfahan 1 2 (Iran) | 1977 | GR | 2-1012 DWDI | 2,800 | 259 | 592 | 2,191 | 990 |
| ENEL |
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