PSV Metric Units
PSV Metric Units
(OP)
Does anyone know if there are 'official' ASME SI units for PSV set pressures and capacities? We've seen set pressures in: kPag, kg/cm2, BARG and capacities (for air) in: NCM/HR, kg/hr and NCM/MIN.
Or is is like the vessel nameplates, data reports, etc. where any SI unit can be used as long as it is consistant between all the documents and nameplates ? (UG 115(b)
Thanks
Or is is like the vessel nameplates, data reports, etc. where any SI unit can be used as long as it is consistant between all the documents and nameplates ? (UG 115(b)
Thanks





RE: PSV Metric Units
RE: PSV Metric Units
I realize the conversions are simple enough but they shouldn't be required.
RE: PSV Metric Units
Bottom line in the code is that you have to use units in your calcs that demonstrate that the vessel meets or exceeds both strength and over pressure protection requirements. The units must be constitent within a given calculation, but need not be consistent from calc to calc, just documented.
David
RE: PSV Metric Units
This brings up another point, if a PSV Data Sheet was develooped using kg/cm2 for pressure and kg/hr for capacity (air), is it acceptable for the PSV nameplate to have the set pressure in kPag and the capacity in cm/hr? Or must the PSV nameplate exactly match the Data Sheet for units?