BS EN 15188:2020 pdf free

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BS EN 15188:2020 pdf free.Determination of the spontaneous ignition behaviour of dust accumulations.
BS EN 15188 This document specifies analysis and evaluation procedures for determining self-ignition temperatures [Ts1) of combustible dusts or granular materials as a function of volume by hot storage experiments in ovens of constant temperature. The specified test method is applicable to any solid material for which the thermal explosion theory according to A.2 holds (i.e. not limited to only oxidatively unstable materials).The specified test is applicable to any dust or granular material that reacts primarily with oxygen from the air. For safety reasons, this test is not used with materials mixed with solid/liquid oxidant [e.g.gunpowder, thermites, wood impregnated with liquid oxygen) or materials that could undergo violent non-oxidative reactions (e.g. peroxides, explosives). On a case by case basis, some types of materials undergoing non-oxidative reactions (e.g. non-violent exothermic decomposition reactions) may be however tested provided that additional safety precautions are taken. Where any doubt exists about the existence of hazard due to the properties of the test material (e.g. toxic or explosive), expert advice is sought.This document is not applicable to the ignition of dust layers or bulk solids under aerated conditions
[e.g. as in fluid bed dryer).The temperature field surrounding the sample shall exhibit maximum spatial temperature differences of 4K at an oven temperature of 120 °C. To determine the differences the temperature shall be measured on 6 sides of a 10 cm sample cube in a distance of 5 cm, respectively. This measurement shall be performed after installing the set-up and if the set-up (including hot storage oven) is changed. The measurement shall be repeated once a year. Radiative heat transfer across the sample surfaces should be minimized.To achieve these conditions a mesh wire screen shall be installed into the oven. The minimum distancebetween the screen and the oven walls shall be 5 cm. The screen consists of mesh wire with mesh opening of e.g. 0,5 mm. The screen shall be equipped with a front door and a sample holder, see Figure 1. The sample baskets shall freely hang in the oven. Additional metal sheets (thickness 0,25 mm to 0,5 mm) can be installed at half height and on top to achieve the above conditions. The width of the  sheets shall be chosen in such a way, that the largest sample basket, hanging in the screen, is covered.BS EN 15188 pdf download.

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