Using the CodeCalc interface with the Paulin Research Group's NozzlePRO software, you can perform FEA and WRC 107 within the same module. FEA can model more types of nozzle geometries.
This module uses the ASME Section VIII Division 1 allowable stress values, which may be conservative in some cases. You can switch to Division 2 values.
FEA generates graphical results showing various ASME stress states. Important results and a sample printout are below. The ASME overstressed areas are reported.
ASME Overstressed Areas
Pad Edge Weld for Nozzle 1
Pl 1.5(k)Smh Primary Membrane Load Case 2
20,116 18,000 Plot Reference:
psi psi 1) Pl < 1.5(k)Smh (SUS,Membrane) Case 2
111%
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The next report, the Highest Primary Stress Report, outlines the stresses at critical location like the nozzle-shell junction and the edge of the pad.
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The Highest Secondary and Fatigue Stress Reports are also provided.
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Next, the program lists nozzle stress intensification factors for use in a beam type pipe stress analysis program, such as CAESAR II.
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NozzlePRO then calculates the maximum individual allowable loads and simultaneously acting allowable loads. Both primary and secondary loads are reported.
|
|
Maximum Individual Occurring |
Conservative Simultaneous Occurring |
Realistic Simultaneous Occurring |
|---|---|---|---|
|
Axial Force (lb.) |
398030. |
120631. |
180946. |
|
Inplane Moment (in. lb.) |
5306513. |
1137199. |
2412363. |
|
Outplane Moment (in. lb.) |
3358105. |
719650. |
1526608. |
|
Torsional Moment (in. lb.) |
2343568. |
710264. |
1065396. |
|
Pressure (psi) |
344. |
111. |
111. |
|
|
Maximum Individual Occurring |
Conservative Simultaneous Occurring |
Realistic Simultaneous Occurring |
|---|---|---|---|
|
Axial Force (lb.) |
618455. |
178300. |
267450. |
|
Inplane Moment (in. lb.) |
5998639. |
1222872. |
2594104. |
|
Outplane Moment (in. lb.) |
5458219. |
1182725. |
2508939. |
|
Torsional Moment (in. lb.) |
2938301. |
847110. |
1270665. |
|
Pressure (psi) |
422. |
111. |
111. |
Conservative simultaneous loads will produce stresses that are approximately 60-to-70 percent of the allowable. Realistic allowable simultaneous loads are the maximum loads that can be applied simultaneously, producing stresses that are closer to 100% of the allowable. Maximum individual occurring primary pressure can be taken as a finite element calculation of the MAWP for the nozzle.
Nozzle-shell junction flexibilities are also available. These flexibilities are used to accurately model the flexibility of the junction and can be included in the pipe stress software used to model the piping system attaching to the nozzle.
You have a choice of performing either a WRC 107 or a finite element analysis from within the same module, without redundant input. As with any finite element program users should visually check the finite element mesh for errors and make sure the FEA results make sense from a stress analysis perspective.
Address technical queries regarding FEA results to Paulin Research Group.