Hazardous Location cert?
Hazardous Location cert?
(OP)
Hi,
I would be cool with any cert that I would need to do, if I knew if I needed it, and which one.
I am building a machine, and I will certainly need to follow NFPA 79, becuase its a machine with a control box. fine.
Here is my question: The machine will not be used in a hazardous location. However the machine will pump hydrogen electrochemically (no moving parts).
There is no oxygen in the gas stream, so to only chance for explosion is if there is a failure. For this I have fans that cycle many volumes of air through the pump area and I have an H2 detector which cuts power to everything (except the fans). Further the electronics enclosure is separate from the pump area.
I realize certs are not by law and are only required by customers, but does a system like this need ATEX certs or anything? Or does the fact that there is never a concentration of H2 that could cause an explosion be enough?
I understand that there are many systems that work with H2, but use enclosure volume replacement rates great enough to not require hazardous location certs nor intrinsically safe equipment. Is this right?
I would be cool with any cert that I would need to do, if I knew if I needed it, and which one.
I am building a machine, and I will certainly need to follow NFPA 79, becuase its a machine with a control box. fine.
Here is my question: The machine will not be used in a hazardous location. However the machine will pump hydrogen electrochemically (no moving parts).
There is no oxygen in the gas stream, so to only chance for explosion is if there is a failure. For this I have fans that cycle many volumes of air through the pump area and I have an H2 detector which cuts power to everything (except the fans). Further the electronics enclosure is separate from the pump area.
I realize certs are not by law and are only required by customers, but does a system like this need ATEX certs or anything? Or does the fact that there is never a concentration of H2 that could cause an explosion be enough?
I understand that there are many systems that work with H2, but use enclosure volume replacement rates great enough to not require hazardous location certs nor intrinsically safe equipment. Is this right?






RE: Hazardous Location cert?
Also keep in mind if there is no certification, then you have a higer burden of proof to defend yourself, should you get sued, that you used reasonable care in designing your machine. Designing it to a standard and get it certified against that standard could be proof of reasonable care of the design. Manufacturing defects are another issue. User mistakes, including abuses and lack of maintanence, are another.
Even if your client does not require a certification, I suggest you seek something to ensure you are limiting your liability as much as you reasonably can.
Don Phillips
http://worthingtonengineering.com
RE: Hazardous Location cert?
But if I have obviated the need for these certs then great.
RE: Hazardous Location cert?
http://www.osha.gov/dts/otpca/nrtl/its.html
http://www.osha.gov/dts/otpca/nrtl/tuvam.html
http://www.osha.gov/dts/otpca/nrtl/met.html
RE: Hazardous Location cert?
RE: Hazardous Location cert?
Not True- Local building codes typically require equipment to be "Listed" Usually by UL. IF the machine is piped into the place it may have to pass the mechanical inspection as well. They may require a NEMA certification as well. Insurance companies have a voice as well. The don't usually OK projects but they do inspections from time to time. They won't be happy if they see something without some kind of Testing LAb lable on it.
Lc