Various methods have been in use for the determination of stresses at the nozzleshell junction due to external loads and moments. Fe107 uses finite element technology to provide stress analysis of nozzle connections on piping and pressure vessel. Local stresses in cylindrical shells due to external loadings on a radial flush nozzle. Hi all, i am trying to create an excel sheet to calculate nozzles according to wrc 107 wrc 537. Codeware personnel are actively involved with the american society of mechanical engineers asme.
There is at least one canned fea analysis, nozzle pro. Wrc 107 presents results for inside and outside of the shell at quarter points. Wrc bulletin 297 broadens and expands upon the methodologies of wrc bulletin 107. Those responsible for codes, standards and specifications that require use of wrc 107 should amend those documents to reflect the fact that wrc 537 is. Each load creates some types of local stresses such as membrane or bending stresses in two directions. Influence of nozzle stiffness on equipment nozzle loads and local stresses, a comparative study. What code should i select wrc 107, wrc297, wrc 537. S a allowable tensile stress under normal conditions. In response to numerous requests over the years for the precise equations depicted in the figures in the 1979 version of wrc 107, wrc 537 has been prepared. From the comparison of fea with wrc 107 and wrc 297 results its easy to know if you should feel comfortable with a design. In this article the shrink ring method is compared with calculation methods from wrc bulletin 107 and bs 5500, appendix g. Wrc 107 now wrc 537 while others evaluate stresses in cylindrical shells and nozzles e.
This step is similar to collecting the data by hand. It addresses nozzles on heads and shells as well as radial, hillside, and lateral nozzles. Autopipe vessel considers the stresses due to the pressure and uses a weld joint efficiency equal to 1 in reference of the ug37 where the thicknesses due to the pressure are calculated for the opening reinforcement equal to 1. The more recent wrc bulletin 537 facilitates more efficient and accurate implementation of wrc bulletin 107 through precise equations and data fitting techniques.
Stresses in nozzle shell junctions due to external loads. In the case of nozzles subject to external loads, the stresses can be here. We would like to show you a description here but the site wont allow us. Nozzle loads part 1 piping engineering knowledge base. The code allowable stress is about here, below yield. An often overlooked issue is that nozzle and attachment sizes frequently fall outside the geometric limits of the wrc 107, wrc 297 and wrc 537 methods. Some sections in this handbook are similar to certain sections in the wastewater handbook because the subject material of the basic aspects is very similar. Fe107 also automatically compares 107 and 297 results against the finite element analyses fea so that users can know when 107 or 297 calculations are accurate enough. Due to liability lawsuits bentley can not provide design details such as this. What code should i select wrc107, wrc297, wrc537 in. Wrc and the water institute of southern africa wisa are recognised to have the handbook developed.
The code does not provide rules for external loads so the methods from wrc 107, wrc 297 and more recently wrc 537 are usually used. From the comparison of fea with wrc 107 and wrc 297 results its easy to know if you. Wrc 107 supports 6 external loads in local stress calculation. June 1999 using codeware compress fenozzle you did send me the input excel spreed sheet format to wrc 107 nozzle loads. Wrc 297 was released in 1984 and goes under the title of local stresses in cylindrical shells due to external loadings supplement to wrc bulletin no. Regards to the above subject wrc 107 nozzle loads, between feb. You may want to check out more software, such as statplus 2007, avantage bpm foundation or qplot, which might be related to fe 107. To determine whether wrc 107 bulletin can be used for local stress checking the following geometry guidelines must be met. Find the maximum loads that can be placed on nozzles using compress.
All forces and moments in the above tables are positive and sign rotation is as per wrc bulletin 107. The objective was to eliminate potential errors in implementation, facilitate proper interpolation and extrapolation and permit efficient computation with modern computers. The wrc 107 procedure only provides stress computation in the shell. Allowable stresses and safety factors asme ii part d s allowable tensile stress. In general, our pressure vessel fea can be used to meet the. Bildy, is the principal author of part 4, paragraph 4. Standard data for materials, gaskets, pipes and flanges. Improve wrc 107 297 calculations for loads on nozzles and attachments. Wrc 537 vs fea boiler and pressure vessel engineering. Fe107 replaces wrc 107 as a calculation tool that can be applied when wrc 107 correlational methods are limited.
Eboogie, for closedform calculations for nozzle in heads, i am not aware of anything aside from wrc 107 which is actually implemented by wrc 537. The actual preparation of the wrc 107 calculation input can now begin. Fe107 is useful for piping and pressure vessel engineers and designers. Hsieh the pritchard corporation abstract a method is presented which allows the vessel engineer to more accurately evaluate the flexibility and. Asme vessel code calculations finite element analysis fea solid modeling drafting canadian registration number crn assistance disclaimer. Some methods evaluate stress in the cylindrical or spherical shell e. Nozzle stiffness and stress computation using a parametrically controlled finite element modeling approach dennis martens the pritchard corporation michael a. Wrc 107 see wrc 537 wrc 537 precision equations and enhanced diagrams for local stresses in. One of the most important steps in the wrc 107 procedure is to identify the correlation between the caesar ii global coordinates and the wrc 107 local axes. Wrc stiffness 4151 2650 232 118 25340 1175 fe analysis stiffness 4500 2803 12385 12037 21515 1191 allowable loads 16800 12600 16800 22920 15280 15280 fx, fy, fz values are in newtons and mx, my, mz values are in newton meters. Example of membrane stress in a cylinder subject to internal pressure.
Influence of nozzle stiffness on equipment nozzle loads. Pvelite calculate this local stresses according to welding research council wrc 107. Convert forcesmoments from caesar ii global coordinates. Design of vertical pressure vessel using pvelite software. Calculation modules for rtod, asme, tema, ejma, ad2000 and en445. Why fea, wrc 107, wrc 537 are all in compress codeware.
Please check if your still have excel spredd sheet may help other compress users. After the input echo, the parameters extracted from the wrc 107 figures are printed to this report. You can also click view report using microsoft word on the wrc 107 297 toolbar to perform the initial wrc 107 calculation and summation and send the results directly to microsoft word. If the stresses are found to be within those allowable values, then the nozzle loads computed by pipe stress analysis are considered as acceptable. External nozzle loads design using wrc107537 youtube. Wrc 107 presents stresses at points picked for ease of calculation and does not present the stress patterns available from fe analysis. Axial force, two lateral force, torsional moment and two bending moments as shown in figure 1. Forum posts that described the version history of a calculation have been migrated as comments on the relevant calculations.
Basically, the wrc 107 297 ignores the stresses due to the internal or external pressure. Most services run exactly as before, but the forum has been discontinued. Software shall use appropriate code year for analysis. In the first step, you have to choose which curve you want to use, on the basis of beta en tau. Local loads are still approximated quite often by means of the socalled shrink ring method first published by the mw kellogg company in their publication design of piping systems. A number of reference books has been used in the compilation of the subject. Tutorial on evaluation of nozzles by computing local shell. Wrc 537 provides exactly the same content in a more useful and clear format. Local stresses in spherical and cylindrical shells due to external loadings.
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