Go/No go Test for the Determination of Dust Explosibility

1. Relevant standards:

  • EN ISO/IEC 80079-20-2,

  • ASTM E1226.

2. Measuring equipment:

  • The equipment used for the measurement is a modified Hartmann tube with a volume of 1 l manufactured by Dekra. The name of it is Dekra CTL04.

Figure 5.: Hartmann tube

3. Amount of sample required:

  • 100-150g

4. Aim of the test:

  • Determination of the explosibility of the given dust under ambient conditions.

5. The procedure of the measurement:

  • The powder is initially tested „as received”.

  • The powder is loaded into the dispersion cup which is at the bottom of the tube. The dust is dispersed with compressed air, and it goes through the constant arc which is created between the two electrodes.

  • If no ignition is observed after 10 dispersions the powder concentration has to be increased: The following concentrations are used during the measurement: 250 g/m3, 500 g/m3, 750 g/m3, 1000 g/m3, 1250 g/m3, 1500 g/m3.

  • If no ignition is observed, then the sieving of the powder is necessary. The dust particle size is below 63 μm has to be tested again.

  • If no ignition is observed, then the sample has to be dried for at least 1 hour at 105°C, and both the „as-received" and particles below 63 μm have to be tested again.

  • If no ignitions are observed with the spark ignition source, then the coil ignition source is

  • used, which temperature is at least 1000°C.

6. Results, evaluation:

  • If in any of the previously mentioned 4 steps ignition is observed then the dust is classed as explosible,

  • If no ignition was observed, then different equipment has to be used for the determination of the dust explosibility.

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