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.
Hazardous Area Classification for Electrical Applications
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usmanahmed
- Posts: 5
- Joined: 09 Apr 2010, 04:08
- Area of interest: Chemical Engineering
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Imran.Idris
- Core Member
- Posts: 59
- Joined: 16 Mar 2010, 04:22
- Area of interest: Chemical Engineering
Re: Hazardous Area Classification for Electrical Application
Whole Urea plant has been declared non-classified by SP (Urea Technology licenser) this means Prill tower too.