COVERAGE OF A GAS DETECTOR AS PER NFPA 2

[Rajavarman N]

 

[DRWeig]

What sort of gas?

Best to you,

Goober Dave

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[Rajavarman N]

I have a requirement to provide gas detectors for these areas 1.H2S detector for battery rooms .2.IR gas detectors for gas compressor and gas regulating metering station halls (medium-Natural gas)
Whereas I searched some brands like detector oy and detronics where I cannot found the exact coverage details of gas detectors since it all mentioned as it can vary based on the gas leak points of equipments.since I'm doing a tender job detailed equipment details not provided to me,I need to quote based on the available area drawings..so is there any coverage details mentioned in nfpa 72 or any other nfpa codes means I can follow the same during this tender stage.

Thanks

 

[cdafd]

Sounds like to would have to look at the device specs

 

[DRWeig]

There are no "coverage details" for gases, although some manufacturers go out on a limb and say they'll detect in a 50-foot radius if the gas mixes evenly with air (like carbon monoxide or carbon dioxide).

Are you sure you want to measure H2S in a battery room and not H2?

Natural gas is mostly methane, which will rise, it's lighter than air. Hydrogen will too. If there's a peak in the room, you can cover a really wide area with just one detector. If the ceiling is flat, though, you'll have to make a judgement call.

If you're really wanting to sense H2S, it's much heavier than air and will spill down out of the leak and spread out. You'll want your detector at the lowest point you can find.

There is nothing in any NFPA code about coverage areas for gas detectors, only for smoke detectors. Do your best to analyze the plans and figure out where's the best place to detect the leak the earliest. Good luck!

Best to you,

Goober Dave

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[Rajavarman N]

Thank you DRweig

 

[chicopee]

One H2 detector over the battery charging station, one in the compressor room and one over the metering station; then what are the detectors to do when they sense the gases?