Consideration of Joint Efficiency in WRC 107/297 Using PV Elite / Nozzle Pro.
Consideration of Joint Efficiency in WRC 107/297 Using PV Elite / Nozzle Pro.
(OP)
We are in process of providing calculations for a pressure vessel details as below:
Dia = 2500 mm
Design Pressure = 10 bar
Design Temp = 150 Deg C
CA = 3
MOC = SA 516 Gr. 60
Radiography = Spot
Joint Efficiency = 0.85
The nozzles loads were to be analyzed as per WRC 107 /297. We have used Code Calc 2012 to do the same. However the client has raised a question asking if the effect of joint efficiency has been considered in the WRC 107 calculations; I haven’t found any input provision in Code Calc or nozzle pro for the consideration for joint efficiency.
Hence I put forth the following questions:
• Has this to be considered? If yes how do we consider it in Code Calc & Nozzle Pro?
• If not to be considered how is this to be justified?
• If I consider doing FEA using Ansys for the analysis of local loads, is this to be considered there?
Dia = 2500 mm
Design Pressure = 10 bar
Design Temp = 150 Deg C
CA = 3
MOC = SA 516 Gr. 60
Radiography = Spot
Joint Efficiency = 0.85
The nozzles loads were to be analyzed as per WRC 107 /297. We have used Code Calc 2012 to do the same. However the client has raised a question asking if the effect of joint efficiency has been considered in the WRC 107 calculations; I haven’t found any input provision in Code Calc or nozzle pro for the consideration for joint efficiency.
Hence I put forth the following questions:
• Has this to be considered? If yes how do we consider it in Code Calc & Nozzle Pro?
• If not to be considered how is this to be justified?
• If I consider doing FEA using Ansys for the analysis of local loads, is this to be considered there?





RE: Consideration of Joint Efficiency in WRC 107/297 Using PV Elite / Nozzle Pro.
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RE: Consideration of Joint Efficiency in WRC 107/297 Using PV Elite / Nozzle Pro.
RE: Consideration of Joint Efficiency in WRC 107/297 Using PV Elite / Nozzle Pro.
If you use WRC107, the stresses are at top/bottom/left/right. If no seam crossing, no need to consider joint efficient. If seam crossing, then use JE.
Same for using FEA, looking at where the stress you are interested, and see if there is any seam crossiong, adjusting allowable stress accordingly by JE.
Why no one considers joint efficient ? because industry common practice is to 100% X-ray the seam adjecent to the nozzle and under the re-pad. So, JE is always 1 at nozzle area.