Pressure Relief Valve Nozzle Orifice Designations
Pressure Relief Valve Nozzle Orifice Designations
(OP)
Hi all,
I have a quick question on how nozzle orifice areas are classified according sizes. (Sorry if this is in the wrong thread; I thought it fits best here since to my understanding, the BPV Code, Sec. VIII, Div. 1 is used as a primary design basis on pressure relief valves. Please correct me if I'm wrong.)
See the attachment. It's a snapshot taken from a typical PRV catalog showing the nozzle designations. I have seen the table with the same values in literature from different vendors, but I wasn't able to find it in the BPV code. Am I just looking in the wrong place? Is there some other ASME code which is used for pressure relief valves? If so, please point me in the right direction.
Thanks for the help.
I have a quick question on how nozzle orifice areas are classified according sizes. (Sorry if this is in the wrong thread; I thought it fits best here since to my understanding, the BPV Code, Sec. VIII, Div. 1 is used as a primary design basis on pressure relief valves. Please correct me if I'm wrong.)
See the attachment. It's a snapshot taken from a typical PRV catalog showing the nozzle designations. I have seen the table with the same values in literature from different vendors, but I wasn't able to find it in the BPV code. Am I just looking in the wrong place? Is there some other ASME code which is used for pressure relief valves? If so, please point me in the right direction.
Thanks for the help.





RE: Pressure Relief Valve Nozzle Orifice Designations
Dejan IVANOVIC
Process Engineer, MSChE
RE: Pressure Relief Valve Nozzle Orifice Designations
Just for clarification, what you are saying is that if the valve was sized according to ASME Sec. VIII Div.1, the orifice designation is not applicable? Does ASME have its own designation tables?
I have received many valve datasheets for a project, and my vendor has written an orifice designation of 'F', but has specified ASME Sec. VIII Div.1 as a design basis. I feel this is incorrect.
Thanks.
RE: Pressure Relief Valve Nozzle Orifice Designations
The actual valve delivered by the vendor does not need to have orifice area according to API 526, but its capacity (the required relief flow) must be ASME certified.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Pressure Relief Valve Nozzle Orifice Designations
Thanks again.