Hazardous Area Classification for Electrical Applications
Posted: 28 Aug 2010, 18:22
The relevant standard for the Hazardous area classification for electrical applications in Petro chemical facilities is API-500, 500A & API-505. It explains the different classes and zone with the concentration of various hazardous and flammable materials as well as the ventilation criterias.
Now my question is specifically about Urea Plant, Prilling tower, Bucket room. Can we define PT bucket room as non classified area for all sort of instrumentations and electrical applications? The hazardous material available could only be NH3 in ~100 ppm. Whereas the flammable range for NH3 is 16 - 25%. One thing we can keep in mind is the accidental situation i.e. flange leakage, etc.
Looking for your suggestions guys.
Now my question is specifically about Urea Plant, Prilling tower, Bucket room. Can we define PT bucket room as non classified area for all sort of instrumentations and electrical applications? The hazardous material available could only be NH3 in ~100 ppm. Whereas the flammable range for NH3 is 16 - 25%. One thing we can keep in mind is the accidental situation i.e. flange leakage, etc.
Looking for your suggestions guys.