WAGNER [Tips & Tricks no. 5 - Calculating the total air quantity]

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Tips & Tricks no. 5 - How to calculate the correct total air quantity

As a rule the ideal powder velocity to is 10 - 15 m/s. To achieve this result you must calculate the total air. The two crucial factors in this are the values for:

The internal diameter of the hose
The velocity of the powder

For the sample calculation below we assume a powder velocity of 12 m/s and an internal hose diameter of 9 mm (r = 4.5 mm).

This is the formula:

and here's the calculation:

In real terms this means that you must set a total air figure (feed and dosage air together) of 2.7m³/h. To make things a little easier for you we have already calculated the total air quantity for the most common internal hose diameters:

Internal hose Ø	Powder velocity	Total air
9 mm	12 m/sec	2.7 m³/h
10 mm	12 m/sec	3.4 m³/h
11 mm	12 m/sec	4.1 m³/h
12 mm	12 m/sec	4.9 m³/h

Learn how to set the total air in the next issue of our Tips & Tricks.

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			Tips & Tricks
			1. The correct nozzle system

			2. The conductive powder hose

			3. The Powder Injector

			4. The correct powder velocity

			5. Calculating the total air

			6. Adjusting the airflows