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1. Relevant standards:
1. Relevant standards:
EN ISO/IEC 80079-20-2,
ASTM E1226.
2. Measuring equipment:
2. Measuring equipment:
A hollow sphere testing chamber with a volume of 20 liters manufactured by Kühner.
Figure 4.: Hollow sphere testing chamber with a volume of 20 litres manufactured by Kühner.
Figure 4.: Hollow sphere testing chamber with a volume of 20 litres manufactured by Kühner.
3. Amount of sample required:
3. Amount of sample required:
200-250g,
4. Aim of the test:
4. Aim of the test:
Determination of the explosibility of the given dust under ambient conditions.
5. The procedure of the measurement:
5. The procedure of the measurement:
The 20-l-sphere and the dust storage chamber must be cleaned thoroughly before each test. The dust is supplied into the 20 l chamber by a solenoid valve with an overpressure of 20 bar.
The ignition source required for the explosion is provided by two 1 kJ chemical igniters. A 0.06 s delay between the start of the ignition source and the dispersion of the dust is applied. The test must be performed at a wide range of concentrations: 30 g/m3, 60 g/m3, 125 g/m3, 250 g/m3, 500 g/m3, 750 g/m3, 1000 g/m3, 1250 g/m3, 1500 g/m3, 1750 g/m3, 2000 g/m3.
6. Results, evaluation:
6. Results, evaluation:
Dust that cannot be induced to explode over a wide range of concentrations with ignition energy of IE = 2 x 1 kJ (chemical igniters) is classified as not explosible.
If at any concentration the dust explodes, then it must be classified as explosible and no further concentration increase is required.
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