How are the AIT of substances and T-class of equipment related?

Auto Ignition Temperature

Auto Ignition Temperature and T-Class The Auto Ignition Temperature of substances and the Temperature Class of Equipment are related. The Auto Ignition Temperature of substances is the lowest temperature in which the substance spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required…

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What means the Pmax of Substances?

Vaper Cloud Explosion VCE

The Pmax of a substance is the maximum pressure that is monitored during ignition of substances at different concentrations in a laboratory test facility. Tests are performed according to EN 13673-1 : “Determination of the maximum explosion pressure and maximum rate of pressure rise of gases and vapours – Part 1: Determination of the maximum…

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What means the LEL and UEL of substances?

LEL and UEL in relation with the Minimum Ignition Energy

LEL and UEL in relation with the Minimum Ignition Energy LEL: The Lower Explosive Limit (LEL) is the lowest concentration of a gas, vapor or dust that will burn in air.UEL: The Upper Explosion Limit (UEL) is the highest concentration of a gas, vapor or dust, that will burn in air. These values for gases and vapors…

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How are the MIE and gasgroup related?

Static electricity

Relation between MIE and gasgroup of equipment Equipment that is certified for used in hazardous areas must be Ex certified according to the applicable standards. Substances which create a hazardous area can be ignited. The energy needed for ignition is expressed with the Minimum Ignition Energy. Equipment which can be used within hazardous area may…

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What means the MIE of substances?

Minimum Ignition Energy

The MIE of a substance is the Minimum Ignition Energy needed in order to ignite a flammable substance with air or oxygen, measures by a standard procedure. Depending on the specific application, there are several standard procedures for determining MIE of dust clouds, solvent vapours and gases. The common element in all procedures is that…

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Hazardous Area Classification | Ammonia Storage

Is the toxic effect of ammonia a larger risk than the risk on explosion?

Is the toxic effect of ammonia a larger risk than the risk on explosion? Quite often we get the question whether it is necessary to classify ammonia storage vessels and pump rooms into hazardous areas. Many people think that it’s not needed because the toxic effect of ammonia starts at low concentrations (ppm) far below…

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What means the AIT of substances?

AIT of substances?

Auto Ignition Temperature The auto-ignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion.  The auto ignition temperature is determined in a laboratory under specific test conditions, outlined in…

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