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1. Role and performance of the detection system
1.1 Reminder of the main flammable properties of gases and vapors
Knowledge of the main properties of flammable gases and vapors is essential for the correct installation of gas detectors. A mixture is said to be flammable when it can propagate a flame. A flammable mixture consists of a fuel gas (or mixture of) and an oxidizing gas (or mixture of). For a mixture to be flammable, the fuel gas(es) must be present in a certain proportion in the mixture. The lower explosive limit (LEL) is the minimum concentration of fuel that can be ignited. Similarly, the upper explosive limit (UEL) is the maximum concentration of fuel gas that can be ignited. Figure 1 illustrates these concepts....
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Role and performance of the detection system
General principles for the installation of flammable gas detectors
Bibliography
Standards and norms
- Explosive atmospheres Part 29-2: Gas detectors – Selection, installation, operation and maintenance of flammable gas and oxygen detectors. - NF EN 60079-29-2 - Juillet 2018
- Guidance on the evaluation of fire, combustible gaz and toxic gaz system effectiveness. - ISA TR 84.00.07-2018 - Octobre 2018
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DETECT3D & In: flow – Insight Numerics. 51 Melcher Street Boston, MA 02210 USA
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