Forced Draught Air Cooled Heat Exchanger API 661 For Petroleum Industry
Brand Name:YUHONG
Certification:ASME , U STAMP , PED, API , ABS, LR, DNV, GL , BV, KR, TS, CCS
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Minimum Order Quantity:1 SET
Delivery Time:45-150 DAYS
Payment Terms:L/C,T/T
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Ningbo China
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Forced Draught Air Cooled Heat Exchanger with API 661, Petroleum
Industry
Selection of Induced Draught or Forced Draught
The air-cooled heat exchanger shall be either a forced-draught exchanger or an induced-draught exchanger and shall include the components shown in Figure 1 and any auxiliaries such as ladders, walkways and platforms. Forced-draught fans should be used, except that induced-draught fans should be considered for the following situations:
- a) If temperature control of the process is critical and sudden downpour of rain (i.e. excessive cooling) can cause operating problems;
- b) To minimize the risk of hot-air recirculation;
- c) On sites where air-side fouling is a significant problem, however forced draft can be used if screens are specified;
- d) To improve thermal performance in the event of a fan failure (due to the stack effect);
- e) In hot climates, where the fan plenum chamber shields the bundle from the sun;
- f ) For services that have a temperature approach of 11 °C (20 °F) or less
| A) Forced Draught | B) Induced Draught | ||
| 1 | Tube Bundle | 6 | Fan |
| 2 | Header | 7 | Fan Ring |
| 3 | Nozzle | 8 | Fan Deck |
| 4 | Supporting Column | 9 | Drive Assembly |
| 5 | Plenum | 10 | Fan Guard |
[Figure 1]
Construction of Tube Bundle
Tube bundles shall be rigid, self-contained, and designed for
handling as a complete assembly.
| Typical Construction of Tube Bundles | |||
| 1 | Tubesheet | 11 | Tube support cross-member |
| 2 | Removable cover plate | 12 | Tube keeper |
| 3 | Removable bonnet | 13 | Vent |
| 4 | Top and bottom plates | 14 | Drain |
| 5 | Tube | 15 | Instrument connection |
| 6 | Pass partition | ||
| 7 | Gasket | ||
| 8 | Nozzle | ||
| 9 | Side frame | ||
| 10 | Tube spacer | ||
[ A) Removable cover-plate header ]
[ B) Removable bonnet header ]
Tubes and Finning
Maximum Fin Selection Temperature for Fin Bonding Types:
| Fin Bonding Type | Maximum Process Temperature °C (°F) |
| Embedded fins | 400 (750) |
| Externally bonded (hot-dip galvanized steel fins) | 360 (680) |
| Extruded fins | 300 (570) |
| Footed fins (single L) & overlap footed fins (double L) | 130 (270) |
| Knurled footed fin, either single L or double L | 200 (390) |
| Externally Bonded (welded or brazed fins) | > 400 (750) (maximum should be negotiated) |
Forced Draught Air Cooled Heat Exchanger API 661 For Petroleum Industry
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