CORONA Service Laboratory
A laboratory test to determine the explosibility and flammability parameters of dusts is a basic step to determine the extent of the explosion hazard in a designated area of an industrial installation. Technological processes in plants generate dusts, e.g. grinding, milling, sieving etc. Dust floating in the air or deposited on machines significantly increases the risk of explosion.
Therefore, in order to ensure the appropriate level of safety of the conducted industrial processes, it is necessary to correctly determine the explosive properties of these dusts.
Dust Explosion test
In order to eliminate or reduce the generation of dust explosive atmospheres, it is necessary to know the parameters and properties of the explosive and combustible dusts that we are dealing with in a given working environment. These tests can be performed using various methods, the most preferred and dedicated being the Hartmann tube test using a spark or hot spiral.
Maximum pressure of explosion Pmax and rate of explosion Kst
This test consists of a series of tests in a spherical tank. The parameters Pmax and Kst are performed by injecting successive concentrations of dust and air into the test chamber. The tests are realize until the maximum values of these parameters are determined.
Lower Explosion Limit
A dust-air mixture is explosive when it reaches the appropriate concentration. The determination of the Lower Explosion Limit takes place after a series of tests in a spherical chamber. In most cases it is between 20-60g/m3. No upper explosion limit is determined for dust.
Minimum Ignition Temperature of a Dust Cloud TCL
Min. Ignition Temperature of a Dust Cloud means the lowest temperature of the hot inner wall of the furnace at which the dust cloud ignites in the air inside the furnace. A tube furnace known as a Godbert-Greenwald furnace apparatus is used to determine the minimum ignition temperature of the dust cloud.
Minimum Ignition Temperature of a Dust Layer T5mm
Means the lowest hot surface temperature at which a layer of dust of a specified thickness on the surface is ignited. The standard suggests a 5 mm dust layer.
Minimum of ignition Energy
The minimum electrical energy accumulated in the capacitor which, when its discharged, is sufficient to cause ignition of the most ignitable mixture of the specified dust under the specified test conditions.
The self-ignition temperatures of dust layer SIT
The test consists of a series of tests to show at what temperature spontaneous combustion may occur. The susceptibility to spontaneous combustion of dust accumulations is determined in accordance with PN-EN 15188:2009
The limiting oxygen concentration LOC
LOC is the highest concentration of oxygen in a mixture of dust with air and an inert gas in which a dust explosion cannot occur.
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