CAEPIPE
CAEFLOW
PIPESTRESS
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User Comments
{"We use CAEPIPE to design the process coils in our steam cracking furnaces. These coils operate at temperatures between 1,200°F & 2,000°F. Supports must be sized properly to prevent coil distortion and rapid failure. CAEPIPE graphic displays are extremely useful in determining if we have input the geometry correctly and in evaluation of results." }
Arthur DiNicolantonio, Exxon, CAEPIPE user for over 12 years
{"The new graphics rendering feature [in CAEPIPE v5.x] is fantastic. It far exceeds the graphics of any other piping stress analysis program I have seen."}
Ed Patnode, Advanced Thermal, CAEPIPE user for over 10 years
Overview
CAELUG is a comprehensive software package for the local stress and flexibility analysis of lug attachments in cylindrical vessels, and piping systems.
Two types of lug geometries (integral rectangular and circular lugs) can be solved using CAELUG. For the purpose of the mathematical modeling, the lugs are modeled as rigid inclusions in the shell and are equidistant from its two ends. The shell ends are taken to be simply-supported. In addition, the lugs are assumed to be located in the shallow region of the shell. This assumption provides accurate results as long as the length in the case of rectangular lugs or diameter in the case of circular lugs does not exceed 50% of the shell diameter.
The CAELUG program performs the analyses for six external loads (three forces and three moments) applied on the lugs, internal pressure in the shell and a temperature difference between the lugs and shell. The main processor of CAELUG performs these analyses by solving thin shell theory equations using boundary integral equation method. Use of this method eliminates mesh generation unlike the finite element method.
The only input for CAELUG are the geometric details of the lugs and shell, material properties of the shell, the applied loadings and the locations at which the results are required. The output are stresses and deflections at the required locations and also the local shell stiffness coefficients for each of the six (6) external loadings.
A powerful user interface that allows for simultaneous editing and graphics capability is planned for the CAELUG program. Using SST's well established one-screen and two-screen approaches, the user can display the lug geometry, loads and local stresses on the color graphics screen.
CAELUG Versus WRC 198
| CAELUG | WRC 198 |
| External lug loads and vessel pressure are analyzed | Only external lug loads are analyzed |
| Lug loads are applied as ring loads at the edge of the rigid lug attached to the shell | Lug loads are applied as pressure on complete shell with no rigid plug for the lug attachment (non-conservative) |
| Geometry and loading are properly modelled and hence results reported for small lug-to-vessel diameter ratios are accurate | Because of the Fourier series approximation of the localized pressure load, results are non-conservative for small lug-to-vessel diameter ratios |
| Rigidity of the lug is included in the solutions so that the forces and moments, and deflections are compatible at the lug attachment | Rigidity of the lug is not included in the shell theory equations used |
| Valid for a wide range of the length to diameter ratio | Valid only for vessel length to diameter ratio of 4 |
| Shell stresses at any distance from the lug attachment are given | Shell stresses only at the lug junction are computed |
| Stresses at any angle around the lug attachment are computed, as maximum stress need not be at any of these four angles | Shell stresses only at 4 angles (i.e., 0, 90, 180, and 270 degrees) are reported |
| Local shell stiffnesses are reported | Local shell stiffnesses are not computed |
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