Vertical Tube Apparatus
Vertical Tube Apparatus : Developed by Hartmann and used for dust explosibility testing. The dust to be tested is placed in a cup near the bottom of a perspex combustion tube 30. 5 cm long and 6. 4 cm inside diam. Air is passed in so that the dust disperses vertically upwards. The igniting source is normally an electric spark but an electrically heated wire coil can be used. If flame propagation takes place it is noted. Qualitative observations are made as to the strength of the explosion. The dust concentration may be changed by varying the quantity of the sample and the pressure of the dispersion air. All types of dust can be tested. Modifications can be made to allow other dust explosion parameters to be measured, e. g. maximum explosion pressure, maximum rate of pressure rise, minimum ignition energy, minimum explosible concentration. A large-scale vertical tube test apparatus has been developed at the Fire Research Station, U. K. It has been proved that results from both forms of apparatus are in line and can also be applied to large-scale plant
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