|
FE107 - Stress Analysis of Nozzle Connections
Windows
FE107 uses finite element technology to provide stress analysis of nozzle
connections on piping and pressure vessel. FE107 r eplaces
WRC 107 as a calculation tool that can be applied when WRC 107 correlation
methods are limited. FE107 is useful for piping and pressure vessel engineers
and designers.
FE107 can be applied to a wide range of geometries.
- Straight (Unreinforced)
- Pad reinforced
- Barrel reinforced (Self-reinforced)Branch or Nozzle
Header or Vessel
- Conical head
- Cylindrical shell
- Elliptical head
- Flat head
- Flanged and dished
What is wrong with WRC 107 and WRC 297?
WRC 107 and WRC 297 are very good documents for engineering practice. It is
based on an analytical treatment of openings in cylindrical shell and
hemispherical heads. This said, there are fundamental assumptions in WRC 107 and
correlations that are used in the correlations that limit the application of WRC
107 in industrial applications. Commonly, computer programs do not provide
warnings or guidance when the limitations are violated.
In general WRC 107 comparisons to FE/Pipe results are excellent when thin shells
are analyzed and when the model is within the accepted parameters of WRC 107.
Nozzles in the centers of heads are evaluated most accurately. Most WRC 107
programs give the stress intensity at four points around the nozzle on both the
inside and outside of the geometry. This stress is usually compared to 3Sm (Sm
is the average of the hot and cold allowable stress) and is caused by all
operating loads on the nozzle. The resulting stresses from a WRC 107 run of this
type should be compared to the Pl+Pb+Q stresses from the finite element
calculation. Note that Pl stresses evaluated in accordance with ASME Section
VIII Division 2 are membrane stresses. These are the average stresses through
the thickness and do not include the bending stress component at the junction.
(See ASME Section VIII Division 2 Appendix 4 Table 4-120.1.)
WRC 297 comparisons in the vessel or header tend to be good but become overly
conservative when the high stress moves into the branch when the t/T ratio
becomes less than 1.0. This result is certainly demonstrated in the finite
element calculation.
WRC 107 tends to be somewhat less conservative than finite element results, but
that WRC 107 results parallel FE calculations through d/D ranges of 0.1 to 0.8,
where the WRC and Finite element curves cross, the WRC 107 results becoming much
more conservative beyond this range. (When the approach used outside of WRC
curve parameters is “last curve value.”)
The following list summarizes areas where WRC 107 and WRC 297 are considered
weak, or where there is cause for concern. Hemispherical head
- d/D > 0.5
- t/T > 1.0
- Pad reinforced nozzles
- Hillsides or laterals
- Area replacement rules for pressure are barely satisfied and large diameter
divided by thickness ration (D/T).
- Temperatures are approaching the creep regime.
- Cycles are greater than 5000.
- Design and operating conditions are approximately the same.
- The load consists of high-pressure stresses and high loads.
- The Piping attached to the nozzle is long, flexible, and somewhat
unrestrained.
MatPRO Integration
FE107 offers tight integration with MatPRO to provide the convenience and
reliability of material properties lookup. The PRG database that contains a full
set of the 2000, 2002 and 2004 ASME Section II Part D material databases.
FE Viewer
FE107 includes the FE-Viewer utility that allows you to interrogate the finite
element analysis calculation so that you better understand the results of the
finite element calculations.
If you have any further queries concerning this
software, please drop us a note
and we will get back to you as soon as possible.
Purchase Online
We have a number of purchase options available in our
store. Our goal is to ensure that you feel comfortable in buying our
software. We therefore employ the highest level of security for online
transactions and accept all major credit cards as well as various options
to purchase such as electronic fund transfer (EFT) or bank draft. Should
you prefer not to provide your details online, we understand and ask that
you send us an email
requesting a pro-forma invoice for the
software in question. Please include relevant company details should you
decide on this option.
We have been selling software via the internet for many years, and
have a list of satisfied customers from across the globe. Should you require references from
some of these companies and individuals please let us know.
  
Purchase Online
| FE107 - Lease Per Year |
$ |
1000 |
|
Should
you like to download a demo of this software, it is available by
clicking the link below.
|
|
