The word "parallel" does not appear in the 2024 NFPA 496. Are you asking about more than one pressure supply to a single enclosure?I saw the this structure in NFPA 496, but I've not found in IEC 60079-2.
Have you heard the parallel pressurized enclosure? there only mentioned about multiple enclosure.
If you have a supply line to each enclosure, each enclosure must be monitored. If you connect them in series, only the last is monitored.Thank you all for your replies!. My question is: if a pressurized equipment consists of multiple enclosures connected in parallel to a single protective gas supply line, is it necessary to install safety functions (e.g., alarm, flowmeter, etc.) on each enclosure?
What if the enclosures are connected in series to the same supply line instead?
5.2.6 ... Where internal compartments or adjacent enclosures are connected in series, the pressure or flow sensor shall be located at the downstream end of the series of compartments or enclosures.
Thank you for the help!Yes, each enclosure must monitor its purge system. There are failure modes that could result in any one (and only one) enclosure losing its purge.
Can I use this way if I get by UL 60079-2?If you have a supply line to each enclosure, each enclosure must be monitored. If you connect them in series, only the last is monitored.
I have no idea of what UL 60079-2 says as it is not available on UL's free viewing platform. In general, the NFPA standards and UL standards do not contradict each other.Thank you for the help!
Can I use this way if I get by UL 60079-2?