Normal Operating Pressure under 15psi considering UG-22 (i)
Normal Operating Pressure under 15psi considering UG-22 (i)
(OP)
If I have a piece of equipment that functions like a gravity-fed silo normally operating at atmospheric but may experience an internal dust explosion, is this equipment considered a pressure vessel? In the previous versions of ASME VIII-1, UG-22 did not have a paragraph (i), while the newer version does. Paragraph (i) lists abnormal pressures, such as deflagration as a loading that must be considered. However, again, the "normal" operating pressure is atmospheric, which would be outside the scope per U-2.





RE: Normal Operating Pressure under 15psi considering UG-22 (i)
"I drank what?!" Socrates?
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
Regards
Stonecold
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
If this a non stamped vessel 15-psi is as high as you can go during venting (Pred). The 2007 NFPA 68 is then the guide, there are many factors involved in explosion venting.
I'd be real cautious of a silo or bin with values as high as you state, but you can't use that anyway you have a 15-psi vessel -and- I'd verify that design pressure.
You could also consider a chemical (sodium bicarb) deluge, if this equipment isn't too large. If a explosion condition exist you now have to isolate this equipment from other equipment, this can be done chemically or mechanically.
psafety
RE: Normal Operating Pressure under 15psi considering UG-22 (i)
If adequately protected by a PRV set below 15 psig, it does not meet the ASME Sect. VIII definition of a "Pressure Vessel", so there is no need to list your non-vessel with the state Boiler & Pressure Vessel board.