Comparison of design and analysis of tube sheet thickness by using uhx code 2. Tube sheet design spreadsheet calculator engineers edge. Boiler tubes thickness pressure equation and calculator. When i calculate minimum thickness of shell i find 8,345 mm 0,33 in.
Lets look at a list of heat exchanger design software tools which can help you with heat. Jan 07, 2015 errors while executing strength calculation for double fixed tubesheet heat exchanger designing a double fixed tubesheet heat exchanger is challenging and complex since various design cases need to be considered while determining the tubesheet thickness including differential thermal expansion between the shell and tube sides. It also specifies tolerances for tube hole diameter, ligament width and for drill drift. Software include vessel and heat exchanger engineer and pipe class component. En 445 part 3 pressure vessel software in accordance with en 445.
The first three type of evaporators are used in sugar industries and recently also use the plate type evaporator. I am trying to calculate minimum thickness allowed of a flat head of my boiler using asme viii div. Optimization of tubesheet thickness of shell and tube heat. The model of fixed tubesheet heat exchanger is made in pvelite software.
To calculate the maximum allowable working pressure mawp. Evaluation of the structural support provided by the shell and the channel to the tubesheet must consider the possibility of plastic hinges at the shelltubesheet and channeltubesheet joints. In this article mainly discussed about robert type evaporator body design criteria. If you need asme uhx and tema mechanical design calculations, drawings and reports then the compress heat exchanger option is for you. The tema method was developed to permit a designer to calculate the thickness of a tubesheet manually without requiring the use of a computer. Modeling of complete heat exchangers or replacement tube bundle assemblies. Mean dia of the tube dm in mtr tube od tube thickness in some designers. You should consider the square tube as a frame with rounded corners and determine the bending moments as well at corners as in the middle of the beams. To simplify the calculation, weld joints are only checked for shear stresses. The head thickness page is an example page to calculate the wall thickness of heads, ellipsoidal, torispherical, kloepper and korbbogen heads. I have to fabricate a tubesheet with 3000 mm dia x 70 mm thk from sa240gr. Based on a paper by hein, a dimensioning program for tubebundle heat. Compress checks your inputs and makes design recommendations.
Two exchangers in series can be modeled in one shell. How can you derive the formula for the asme pipe thickness calculation. Tubesheet thickness calculation for shell and tube heat exchanger posted in free for all. Pdhonline course m371 2 pdh shell and tube heat exchangers.
Thickness of rectangular tubesheet cr4 discussion thread. Clause uhx of asme section viii division 1 defines the rules for the calculation of tubesheets in shell and tube heat exchangers. For the above case, what value of g should be used to calculate the tubesheet thickness for bending. Calculate shellnozzlechannelheadtube sheet thickness. This calculation is based on the gardners theory 19481952, also. Shell and tube heat exchanger design software for thermal. Compress is an expert system that produces professional level pressure vessel design reports with a single button click. On the design of the tubesheet and the tubesheettoshell. Regards, bruno segretain software development manager for autopipe vessel. You must examine the result of the calculation in detail. Minimum leak path calculationto comply requirement as per clause qw193.
The appropriate amount of tube expansion for the tube expander differs depending on the dimensions of the tube sheet hole diameter, outer diameter of the tube, and tube thickness as well as the material of the tube. The required heat transfer area, the number of tubes and the shell size are. Calculations for tubesheet thicknesses for various type of heat exchangers. A simple tubesheet layout program for heat exchangers 1s. Errors while executing strength calculation for double. There is a tubesheet button on the detail toolbar that you have to press. How can you derive the formula for the asme pipe thickness. The strength calculation of heads are one of the frequently performed calculations since most equipment consist of one or two of them.
The mode and the root cause of the failure were investigated by chemical composition analysis of the tube material, metallographic structure and crack observation, and corrosion product analysis of the damaged tubes, as well as the operation condition examination of the waste heat boiler. Shell and tube heat exchangers are complex and more expensive than ordinary pressure vessels. It has to be noted that, in the cases where this radial thermal expansion is generating high radial tubesheet stresses, an increase of the tubesheet thickness has generally a negative effect. Calculate the required heat transfer area based on values needed. Bhaskar rao 1department of mechanical engineering, jaya prakash narayan college of engineering, mahabubnagar, andhra pradesh, india 2scientist g and head, design engineering division, indian institute of chemical technology, hyderabad, andhra pradesh, india. Calculation modules for rtod, asme, tema, ejma, ad2000 and en445. International journal on recent technologies in mechanical and electrical engineering ijrmee issn. Then lets look at some commonly used heat exchanger design software tools which can help you. Enabling specification of more accurate design details, exchanger optimizer 3. Comparison of design and analysis of tube sheet thickness by using uhx code 2 3,373 views.
This results are also validate with the other software i. Thus fea can be used as an optimization tool for tube sheet thickness. The thickness of the tubesheet is usually computed from the formulas given in the tema standards the tema tubesheet thickness formula, essentially based on the works of the late karl gardner, takes the restraining effect of the welded channel and shell into account in an approximate manner. Leakage at the tubetotubesheet joints occurred in a waste heat boiler. Root cause analysis of stress corrosion at tubeto tubesheet. Software for mechanical design of pressure vessels and heat exchangers in accordance with the harmonized standard en 445 part 3. Tubesheet thickness calculation for shell and tube heat. Make better heat exchanger design decisions with exchanger. A simple tubesheet layout program for heat exchangers. Tema gives design rules to calculate the tubesheet thickness, which give similar but not identical results to the rules in asme and bs5500. Asme section i boiler tubes up to and including 5 inches o. Tubesheet type and design code tab heat exchanger tubesheet. Dec 04, 2016 minimum leak path calculationto comply requirement as per clause qw193.
Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. Errors while executing strength calculation for double fixed tubesheet heat exchanger designing a double fixed tubesheet heat exchanger is challenging and complex since various design cases need to be considered while determining the tubesheet thickness including differential thermal expansion between the shell and tube sides. Infact im trying to perform an elastic plastic analisys but pvelite keeps correcting the overstressed tubesheet by using the increase tubesheet thickness method. Therefore an automatic optimization of the tubesheet thickness made by keeping. Asme uhx and tema heat exchanger software codeware.
If this is not the case, please log a service request with your data file in attachments. Number of transfer units, effectiveness, thermal capacity ratio. Calculation of minimum retirement thickness values for existing heat exchangers. The classic software allows to meet many calculation and cost evaluation needs for pressure vessels and heat exchangers. Permissible tubesheet construction from plate material cr4. Leakage at the tubeto tubesheet joints occurred in a waste heat boiler. This calculation is based on the gardners theory 19481952, also considered in appendix a of the tema standards previously generally used in tubesheet calculations. Issn 2348 7968 optimization of tubesheet thickness of. When i calculate the thickness of my flat head using the formula below i find 56,381 mm 2,22 in. Comparison of design and analysis of tube sheet thickness by. This makes it the perfect solution for companies that want to bring their design work inhouse. But most process engineers commonly rely on process simulation software to quickly perform these heat exchanger design calculations. The method of comparative stresses is based on the fact that the shear strength of weld metal is lower than the tensile strength. The calculation of fixed tubesheet exchangers according to.
The shell thickness calculation page is to calculate the wall. The tubesheet thickness is optional, it can be set by the user or will be. There exists many different tools used to design, size and rate heat exchangers. Asme uhx and tema tubesheet thickness calculations and reports.
Aug 03, 20 from the result table vi it is observed that the classical design procedure for calculating tube sheet thickness as per tema and asme standards gives tube sheet thickness of 75mm and 60mm respectively but, fea gives more optimised tube sheet thickness of 45mm. International journal on recent technologies in mechanical. The minimum required thickness, according to asme paragraph pg27. Includes a ped classification tool to determine the required category and. The optimum thickness of the tube sheet, the shell and channel are.
From calculation results according to uhx code the most critical load case is load case 6 that is shell side pressure acting along with. Accessing this resource requires an active premium membership with engineers edge. Dear experts, i need to do tube to tubesheet welding for cs steel that is tubesheet material is sa 516 gr. Tube expansion evaluation and measurement of processing. In the calculation this nozzle and channel will be added to the calculations. Doubt in calculation of a flat head of a firetube boiler. The software can be installed on his machine but the hardware key is needed to run. For example, fixed tubesheet heat exchangers are often designed with expansion joints to handle the differential thermal growth between the tubes and the shell.
Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. Convert accordingly and properly before the calculation. An elasticplastic analysis of the integral tubesheet in u. Perform elasticplastic calculation performing the elasticplastic calculation at that junction is recommended if all prerequisites are satisfied. We use pv elite or compress to design heat exchangers. How to find the thickness required for the rectangular tube sheet. Different methods are available for the attachment of the tube end to the tubesheet. Minimum leak path calculationto comply requirement as per. The en445 module includes the alternative method for tubesheet calculation to annex j, which can give significant reduction in tubesheet thickness for fixed tubesheet designs. With these two conditions, it is not sufficient to merely replace the tubesheet by its equivalent solid plate i. Finite element analysis of a tubesheet with considering effective geometry properties through.
The development of tubesheet layout program for shell and tube heat exchangers is presented in this study. If stresses within allowable then go to step 7 else. Both horizontal and vertical heat exchangers can be modeled. Clearance for tube thickness, stressstrain data of materials used in assembly to get required residual pressure, it is also observed that some parameters that affect the tube to tube sheet. Heat exchanger calculations and design with excel spreadsheet. These asme code calculations with the uhx tubesheet calculations were run in intergraph pv elite software. Lets look at a list of heat exchanger design software tools which can help you with heat exchanger design calculations and to prepare a specification sheet. However this is a design case that should be considered and included in the calculation checks.
Changes in required tubesheet thickness often thicker vs tema have been noted by designers. Good practice for heat exchanger selection and design. Increase cylinder and tubesheet thickness increase for both the tubesheet and the integral cylinder. It saves engineering hours while reducing errors and omissions. Finite element analysis of a tubesheet with considering. Comparison of design and analysis of tube sheet thickness. Tube expansion process using the tube expander insertion of tube adhesion to the tube and sheet hole completion of tube expansion fitting tube expansion evaluation and measurement. Dear all,i faced the problem in caculation of tubsheet thickness calculation for shell and tube heat exchanger. Use armacells selfservice armwin insulation thickness calculator to determine the right material thickness to prevent condensation or heat loss. Issn 2348 7968 optimization of tubesheet thickness of shell.
Determines the preliminary size for a shell and tube heat exchanger based on the process information provided. Increase integral cylinder thickness increase for the shell, or channel, or both. Tube expansion evaluation and measurement of processing for. But the calculation method is the same as in the standard calculation method. If i read a codecalc data set with pv elite do i ruin it if i go back and try to use. How to calculate the minimum required wall thickness for tubing. Heat exchanger design calculation,analysis,rerating. I see that nobody reacts since no method is listed in the wikipedia so that i try to give you a hint. The calculation of fixed tubesheet exchangers according to asme. The appropriate amount of tube expansion for the tube expander differs depending on the dimensions of the tube sheet hole diameter, outer diameter of the tube, and tube thickness as. Permissible tubesheet construction from plate material 042016 10. All code questions are to be calculated in mm and mpa unless otherwise stated. The tubesheet in a utube heat exchanger with integral shell and channel joints may develop high discontinuity stresses at these joints. Pressure piping thickness and flange rating calculation this case study demonstrates the use of a script and a generic 4d chart to enable flownex to calculate standardscompliant wall thicknesses and flange ratings of piping used in high pressure flow applications.
The shell id not channel id shall be used to calculate the tubesheet thickness for both the tubeside calculation and the shellside calculation. Heat exchangers jordan university of science and technology. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger. For the mechanical design of an existing fixed tubesheet heat exchanger.
Armacell has completely revised its technical calculation program and for the first time also provides armwin for use on mobile devices such as smartphones. What is the reason that the tema tubesheet design method does not calculate stresses at the tubesheet channel and tubesheet shell junction. Pvelite is one of the customized software for vessels like heat exchanger, boiler etc. Armacells new armwin insulation thickness calculator to determine the material thickness to prevent condensation or heat loss. Softwares are used to generate the stresses on the structure. Calculation codes are asme, dutch rules and the en euronorm. Part of the design process includes the determination of the amount of tubes to be used in the heat exchanger. Mechanical design of shell and tube type heat exchanger. Below are some of the tools and information we use on a routine basis.
Program is written in autolisp language, which provides standard tubesheet layout drawing. Permissible tubesheet construction from plate material. Standard data for materials, gaskets, pipes and flanges. Engineering excel spreadsheet downloads welding design and engineering pressure vessel design and engineering. Errors while executing strength calculation for double fixed. The tubesheet is symmetric in the parts of interest here with regard to two meridional planes, and is. Optimization of tubesheet thickness of triple concentric pipe heat exchanger using asme codes.