This article's table of contents introduction:
- Model Breakdown: 8-09-8D
- Technical Specifications (Approximate)
- Common Applications
- Comparison: Why "8-09" instead of "9-19" or "9-26"?
- How to use this specification
The query "8-09-8D High-Pressure Centrifugal Fan" refers to a specific model designation used primarily in Chinese industrial fan manufacturing (following standards like JB/T or GB/T). Here is a technical breakdown of what this model number means and its typical applications.
Model Breakdown: 8-09-8D
This number is parsed into three parts: 8 (Series), 09 (Pressure Level/Design Point), and 8D (Impeller Diameter & Drive Type).
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8 (Series Designation):
- Indicates the fan's general application for high pressure and medium to high flow.
- It is typically used for forced draft (boosting pressure) or material conveying.
-
09 (Pressure Coefficient / Specific Speed):
- Refers to a specific aerodynamic design point.
- "09" generally signifies a high-pressure (often 3000-7000 Pa static pressure range) and low-to-medium flow configuration. It is a narrow design optimized for overcoming system resistance (ductwork, filters, burners).
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8 (Impeller Diameter in dm):
- 8 = 800 mm (0.8 meters) impeller outer diameter.
-
D (Drive Arrangement):
- "D" = Direct Drive. The impeller is mounted directly on the motor shaft. This means the fan speed (RPM) is fixed to the motor speed (e.g., 1450 RPM for 4-pole, 2900 RPM for 2-pole).
- Note: If it were "C", it would be belt-driven.
Technical Specifications (Approximate)
| Parameter | Typical Value (800mm Impeller) |
|---|---|
| Motor Power | 5 kW ~ 30 kW (depending on RPM) |
| Speed (RPM) | 1450 RPM (4-pole) or 2900 RPM (2-pole) |
| Max Static Pressure | ~ 3000 - 7000 Pa |
| Max Airflow | ~ 10,000 - 25,000 m³/h |
| Inlet/Outlet | Usually round (DN400 or similar) |
Common Applications
Because this is a high-pressure, low-flow centrifgual fan, it is used where air must be pushed through significant resistance:
- Boiler Supply: Forced draft fans for small to medium industrial boilers.
- Pneumatic Conveying: Moving granular materials (cement, grains, wood chips) through pipes.
- Furnace Ventilation: Industrial ovens or heat treatment furnaces.
- Filter Systems: Pushing air through high-resistance bag filters or cartridge filters.
Comparison: Why "8-09" instead of "9-19" or "9-26"?
You will often see 9-19 or 9-26 high-pressure fans. The 8-09 series is a less common but specialized variant:
- 8-09 vs 9-19: The 9-19 is the ubiquitous "general heavy-duty" high-pressure fan. The 8-09 tends to be slightly higher pressure at the cost of lower flow for a given impeller size.
- 8-09 vs 9-26: The 9-26 is a "high flow" high-pressure fan. The 8-09 is a "low flow" high-pressure fan.
How to use this specification
If you are sourcing or replacing a 8-09-8D fan:
- Check the motor speed: "D" drive means the RPM is fixed. You need to know if it's a 2-pole or 4-pole motor.
- Confirm the rotation: Standard rotation is "Right" (clockwise from drive side) or "Left" (counter-clockwise). This is usually specified in the full part number (e.g., "8-09-8D Right/90°").
- Verify the inlet: Most of these have a single inlet (like an 80mm or 100mm round pipe) and a scroll outlet.
In summary: The 8-09-8D is a direct-drive, 800mm impeller, high-pressure centrifugal fan optimized for low-flow, high-resistance applications like boiler forced draft or pneumatic conveying. It is a specialized industrial workhorse, not a general ventilation fan.
