11.2.6 Pressure losses
For sucking off dust-laden air both smooth pipes as well as air ducts can be used to set up connection with the filter plant.
Air ducts are plastic hoses that are reinforced by a spiral made of spring steel. According to the respective spiral distance the air duct can be used for very different vacuums.
As a standard, air ducts are available at diameters ranging from 250 – 2400 mm and in single lengths of 5 and 10 m.
The pressure loss amounts to about 50 Pa per m/air duct (NW 300), as regards a smooth pipe this value is only about 10 Pa per m/pipe (air velocity about 20 m/s).
The total pressure loss in a pipe transporting air should not exceed the value of ventilator compression, if possible. If the pressure loss of the plant is higher than the ventilator compression the air volume flow decreases.
- Table of contents
- 1. Fields of application of abrasive blasting technology
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2. Blasting technology
- 2.1 Airless blast cleaning
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2.2 Injection blasting
- 2.2.1 Compressed air blasting (also air blast cleaning or sand blasting)
- 2.2.2 Pressure blasting (injector blasting)
- 2.2.3 Vacuum-compressed-air blasting and vacuum injection blasting
- 2.2.4 Damp blasting
- 2.2.5 Wet blasting
- 2.2.6 Slurry blasting
- 2.2.7 Ice Blasting
- 2.2.8 Water- jetting cleaning and hydro-jetting
- 2.2.9 Wet blasting for fine surface treatment
- 2.2.10 Combination of different blasting methods
- 2.3 Laser cleaning
- 3. Abrasive
- 4. Efficiency assessment of abrasive blasting
- 5. Influence of compressed-air blasting on the surface of the workpiece
- 6. Generation of compressed air
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7. Plants for compressed-air blasting
- 7.1 Small and medium-sized blasting pots
- 7.2 Large blasting pots
- 7.3 Double-chamber blasting pot
- 7.4 Mixing and dosing valve
- 7.5 Hoses, lengths of hoses, couplings
- 7.6 Selection of a blasting pot in considering the wear and tear behaviour
- 7.7 Increased wear and tear at the blasting pot caused by wrong adjustment
- 8. Remote control and emergency shut-downs
- 9. Jet nozzles
- 10. Stationary blasting halls
- 11. Mobile abrasive blasting equipment
- 12. Laws and provisions