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Q: How do I make a comprehensive finite
element analysis on nozzles I design with
COMPRESS?
A: Ctrl + Click
FEA-Nozzlescalculates and reports
Stress The actual stress developed on the nozzle and in the
shell as aresult of internal pressure and applied loads for various
load cases.
Stress Intensification Factors (SIFs) FEA calculated stress
divided by
stress calculated by ordinary methods yields this factor which
is useful inpredicting stress in other load cases. The pipe stress
analysts want thisnumber.
Code compliance Do the developed stresses exceed those permitted
bythe Code?
Allowable operating, expansion, sustained loads These are the
maxi-
mum loads which can be applied to the nozzle.
Fatigue stresses Repeated pressure cycles can cause a nozzle to
fail.You can input your own cyclic history or use a Code
default.
MAWP This MAWP calculated numerically finds that pressure which
will
bring the nozzle to the maximum allowable stress.
Stiffnesses This determines how the nozzle will react to an
applied
piping or other load. ASME VIII Div 2 primary stresses and
allowables In Div 2 you can
consider secondary, temporary, and peak stresses, not defined in
Div 1.
FEA-Nozzlesa module in COMPRESS
FEA-Nozzlesis a module of FEPipe, the excellent finite element
analysis programfrom Paulin Research. FEA-Nozzles receives a data
set from COMPRESS and in
about ten minutes generates a complete finite element
analysis.
It cant get any easier than that. Once you havedesigned a nozzle
in COMPRESS and specifiedany applied loads you are one click away
from FEA.
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The reports from FEA-Nozzles are extensive and compre-hensive.
These reports are stored in HTML files and are
accompanied with bitmap plots of stresses and displace-ments.
They are included as a part of the COMPRESS
report.
FEA-Nozzles automatically meshes the model and checksthe mesh to
confirm that it will give a satisfactory solution.
The objective in writing this program has been to make itas
automatic as possible. You do not have the flexibility to
adjust parameters as in FEPipe, but you do have incredibleease
of use. If you also have FEPipe you can retrieve thefile generated
by FEA-Nozzles and make adjustments.
The above calculations have practical value because
FEA-Nozzles offers an alternative to WRC-107 and WRC-297.
Large nozzles can be analyzed, not depending on Appendix1-7band
U2-g.
Nozzles on knuckles can be analyzed.
Nozzles on cones can be analyzed.
True MAWP can be calculated, not depending on Code rules.
Anozzle inadequate by Code rules may sometimes be shown byanalysis
to be acceptable.
Effects of fatigue can be analyzed to predict useful life.
With stiffness you can use your favorite pipe stress program
tomore accurately design a piping connection to the vessel.
Codeware11221 Richmond Ave Ste C-103
Houston, TX 77082Phone 281-497-5705, FAX 281-497-5839
[email protected]
FEA-Nozzles can pay for itself the first time it isused. Go
figure that return on investment!
