hi my name is syahida. may i know the accurate concentration of lpg gas?? is it 250 ppm consider as dangerous gas in household? can you guide me to do the project of lpg gas detector system...
Syahidah.... LPG is a mixture of low hydrocarbons that are highly combustible gases. Being in gaseous state they are easily introduced to air. They are also dangerous because they are heavier that normal air components and thus the my be concentrated in the lower parts of air in a closed space. There is a great risk that even switching a light or any electrical equipment will bring about a spark that may ignite the whole room in no time. The level of concentration is determined by the volume of space available, and the season, .. Regards
This Public Health England file (attached) may assist you . LPG is a mix of propane and butane hydrocarbon gases. The range of concentrations in air where it can explode is roughly at more than 2% and less than 10% - although as mentioned above as they are heavier than air the concentrations at floor level may reach these levels even if the overall concentration in the room volume is much lower.
The lowest Maximum Workplace Exposure Limits (for 8 hour long term exposure periods) is around 600 ppm (for butane) as they are also carcinogenic.
Gas detector location is critical, probably more so than the sensitivity level of the detector, and there is extensive documentation on that, more so in industrial deployment than domestic use. Flow patterns are impacted by congestion from objects placed at floor level and resulting channelling of gas are critical things to understand, for example.
My experience is now rather old and comes from setting up and using gas detectors used on oil and gas drilling rigs, although our issue were different as we were required to detect a wider range of gases, both chemically and in respect of their densities. A method of protection of exposure to gas emissions outside is to maintain a positive pressure environment inside (for such as control rooms loading with electrical gear that would be an ignition source). Obviously if the LPG leak in question is from a source within a domestic environment that solution may not be any use.
Hello, you may read the following article. Hope it will help your project. Thanks
- DOI: 10.11648/j.pse.20190301.12
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