Collection of Practical Software for Chemical Engineering Calculations V8.6.8------Updated on May 18, 2025

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This post was last edited by chalisen on 2025-8-21 at 10:45. Collection of Practical Chemical Engineering Software V8.6.8 (formerly Collection of Practical Software for Chemical Engineering Design). Sponsorship for registration is welcome – support as you can! If you need this software, leave your email address on the forum (please provide a hyperlink)! -------------------------------------------------------------------------------------------------------------------------------------------------------------- To help new friends understand \"Hui Cui\", here is a brief introduction to it: Every calculation program in the \"Practical Chemical Calculation Software Collection\" is original; each one was developed by us with great effort, over a period of more than ten years, through painstaking step-by-step development! I also received great assistance from many friends, including Yu Meihong, during the writing process; I would like to express my thanks to them all here. However, due to our limited capabilities, mistakes are inevitable; we earnestly ask our friends for their criticism and suggestions! More than ten years have passed since this small software was introduced to users on the Haichuan Chemicals Forum in February 2024; through continuous improvements and enhancements, it is now even more user-friendly! I would like to express my sincere gratitude to the leaders of the Haichuan Forum and all the forum members for their enthusiastic support, care, and encouragement over the years! Main features of “Hui Cai”: 1. The operation of Hui Cai is very simple; even those with only basic computer skills and no knowledge of foreign languages can use it easily. The interface of Hui Cai is in the format that people usually enjoy. The interface of each software is quite clean, and you can move it around with the mouse. If the image on your computer’s display is too small to be seen in its entirety, simply move the image using the mouse ； 2. Hui Cui contains a large number of software applications, nearly a hundred in total. Many of these are programs that include multiple software components within them; they can be used individually, and some of them can also verify each other ； 3. The formulas and data used by the software are primarily derived from **standards**, design manuals published by authoritative publishers, internationally recognized standards, or well-known large-scale design institutes in China; the calculation results of the software are then verified directly using examples from these sources ； 4. The software also contains many explanations regarding calculation methods, design methods, and equipment selection; some of it includes definitions for terms that are prone to confusion ； 5. Almost every software comes with example problems, allowing users to get familiar with the user interface and the way to enter calculation parameters when using it for the first time ； Of course, it can also be used as practice problems to test one’s calculation skills, especially for those who are just starting out in this field. 6. Many software programs provide reference data or hints below, to the side of, or in the blank spaces next to the input conditions, thereby reducing the hassle of having to look for reference materials separately. When entering calculation data, if you enter incorrect values (quantity or units), many software programs will provide a prompt ； Some software also provides visual cues such as flashes or color changes during the calculation process, to let you know which button to press or what issues to be aware of ； 7. The calculation results of most programs list important intermediate data, which can be used to verify the calculations or as a reference for learning ； 8. The calculation interface combines text and graphics; many calculation results are directly indicated on the equipment or pipes, making them easy to see at a glance ； Some devices also come with schematic diagrams of their operation. 9. This set of small software is particularly useful for optimizing the plans of small and micro projects; thanks to its convenient and fast calculation capabilities, the results of various options can be obtained immediately, making it easy to decide which ones are better. 10. Some design specifications can easily be turned into software, such as those for the classification of pressure pipelines and ultrasonic inspection; however, considering that logical diagrams may provide a clearer representation and are easier for everyone to use, understand, and remember, logical diagrams were ultimately chosen ； 11. This set of small software tools is like the gadgets in a toolbox; they may not be needed all the time, but they are very convenient when required. 12. To alleviate the monotony of computational work and the fatigue associated with it, some interesting and beneficial games are also included here to help people relax during breaks. For those new to the chemical industry, this software may greatly increase your interest in and confidence in chemical calculations, serving as a valuable mentor and helper to you. ------------------------------------------------------------------------------------------------ Software Catalog: Pipes - Containers --- Calculation of pipe parameters for commonly used steel pipes in chemical systems --- Calculation of pipe parameters for commonly used steel pipes in Sinopec systems --- Calculation of pipe spacing --- Calculation of pipe span --- Conversions between pipe diameter, flow velocity, and flow rate; calculation of parameters such as container weight, volume, and surface area --- Calculation of pipe wall thickness or the wall thickness of horizontal pressure vessels --- Calculation of support spacing for horizontal straight pipes

Stress - Materials --- Calculation of square compensators with small bending radii --- Calculation of hydrostatic test pressures for commonly used metal pipes --- Calculation of the arm length or fold length of L-shaped and Z-shaped natural compensators --- Calculation of the discharge area of rupture discs --- Reference materials for calculating rupture disc discharge area (1) --- Reference materials for calculating rupture disc discharge area (2) --- Calculation of wall thicknesses for straight pipes under internal pressure and for bent pipes --- Calculation of blind plate thickness --- Calculation of the reaction force due to material discharge from safety valves

Compression - Fans --- Calculation of compressor shaft power --- Calculation of selection parameters for centrifugal fans --- Calculation of the conveying capacity of screw conveyors --- Calculation of screw conveyor power

Pumps --- Procedure for selecting industrial pump types --- Classification and type selection of pumps --- Main characteristics of various pump types --- Requirements for pumps in chemical plants --- Guidelines for selecting pumps in chemical plants --- References for pump selection in typical applications --- Calculation of head and power of centrifugal pumps --- Calculation of installation height for centrifugal pumps --- Examples --- Calculation of the relationship between altitude and atmospheric pressure --- Calculation of NPSHr, NPSHa, and installation height for centrifugal pumps --- Reference materials for calculating NPSHa and installation height of centrifugal pumps

Fluid Resistance --- Calculation of resistance in pipes for uncompressible fluids in single-flow conditions --- Calculation of resistance in pipes for compressible fluids in single-flow conditions --- Examples of resistance calculations for uncompressible fluids --- Calculation of pressure drop in gas-liquid two-phase flows (non-flash type) --- Pressure drop calculation charts for dispersed flows, description of flow patterns, and correction coefficients for pressure drop --- Example (Example 2) introducing the calculation methods and steps of the Lockhart-Madley method --- Example (Example 4) introducing the calculation methods and steps of the Dukele method --- Hydraulic calculation for slurry pipes and calculation of power for transfer pumps --- Calculation of pipe diameter and pressure drop for dense-phase pneumatic conveying pipes

Insulation - Orifice Plates --- Calculation of single-layer insulation thickness based on allowable heat loss --- Calculation of the optimal single-layer insulation thickness for pipes --- Calculation of double-layer insulated material thickness based on allowable heat loss --- Calculation of the length of steam tracing pipes for equipment --- Calculation of electric tracing power --- Calculation of the orifice diameter of pressure regulating orifice plates --- Calculation of flow restricting orifice plates --- Relationship graphs between C-Re-d0/D for flow restricting orifice plates, compression factor graphs, and examples --- Relationship graph between γc-k-d0/D for flow restricting orifice plates and calculation examples --- Additional calculation examples for flow restricting orifice plates

Valves --- Calculation of safety valve nozzle diameter when discharging gases and water vapor --- Calculation of safety valve nozzle diameter when discharging water vapor --- Calculation of safety valve nozzle diameter when discharging liquids --- Calculation of the discharge volume of safety valves in case of fires in liquid hydrocarbon containers --- Calculation of the wetted surface area of liquids in several commonly used containers --- Calculation for selecting piston-type pressure reducing valves --- Calculation of the drainage volume required for check valves --- Calculation of breather valves

Mixing - Blending --- Calculation of power for open turbine mixers --- References for selecting mixers --- Calculation of pressure drop in static mixers --- Comparison of performance among five types of static mixers --- Applications of five types of static mixers

Parameter Calculations --- Lookup of allowable stress values for commonly used steels at different temperatures --- Lookup of specific gravities of saturated alkane liquids --- Lookup of specific gravities of saturated olefins and dienes --- Lookup of enthalpy values of superheated steam --- Lookup of temperature, pressure, and enthalpy values of saturated water vapor --- Lookup of density, viscosity, and other relevant parameters of water, saturated water vapor, and air at different temperatures or relative humidities --- Calculation of water addition amount in temperature reduction and pressure reduction units --- Calculation of dew point

Columns - Crystallization - Drying --- Calculation of tray numbers in heavy disk float valve columns --- Examples and calculation steps for float valve column calculations --- Basic knowledge of tray design --- Calculation of sectoral area, arc area, and chord length --- Calculation of the number and spacing of downcomers in trays --- Calculation of the average crystallization time of liquid in batch crystallizers --- Calculation of spray drying processes --- Application calculations using I-H diagrams

Heat Transfer --- Estimation of heat transfer coefficient when used as a heater --- Estimation of heat transfer coefficient when used as a cooler --- Estimation of heat transfer coefficient when used as an evaporator --- Estimation of heat transfer coefficient when used as a heat exchanger --- Estimation of heat transfer coefficient when used as a condenser --- Calculation of tube wall temperature in heat exchangers --- Basic knowledge of shell-and-tube heat exchanger design --- Calculation of overall heat transfer coefficient --- Calculation of temperature difference correction coefficients and effective temperature differences for tubular heat exchangers

Separation --- Calculation of vertical gas-liquid separators --- Calculation of horizontal gas-liquid separators --- Process calculation for vertical mesh separators --- Calculation of liquid-liquid separators (vertical and horizontal) --- Basic knowledge for selecting and designing gas-liquid separators --- Process calculation for standard cyclone separators --- Examples and explanations related to cyclone separators --- General knowledge for selecting and designing cyclone separators

Storage Tanks --- Calculation of tank wall strength for large storage tanks --- Calculation of wind stability (reinforcement rings) for large storage tanks --- Calculation of volume and liquid level for standard elliptical head horizontal storage tanks --- Calculation of liquid level and volume for vertical storage tanks with standard elliptical heads --- Calculation of liquid level and volume for storage tanks with flat covers and conical bottoms without folds

Pressure Pipes --- Classification of industrial pipes into GC categories --- Classification of fluids (GB50316-2000) --- Regulations for radiographic and ultrasonic inspection of pipes GB50235-97, GB50316-2000 --- Regulations for radiographic and ultrasonic inspection of pipes. Sinopec industry standard SH3501-2002

Environmental Protection - Boilers --- Calculation of flare tower height --- Introduction to methods for calculating flare tower height 1/2 --- Introduction to methods for calculating flare tower height 2/2 --- Calculation of chimney draft --- Formulas for calculating chimney draft --- Calculation of boiler chimney height --- Formulas for calculating chimney height --- Calculation of pollutant concentration in the atmosphere --- Main formulas and charts --- Calculation for selecting silencers

Others --- Calculation of the length and quantity of rebar in circular reinforced concrete foundations, as well as insulation quantities for equipment and piping --- Calculation of quantities for valve chambers

Entertainment --- Lookup of human biological rhythm patterns, statistical analysis of physical strength, intelligence, and emotions, introduction to human biological rhythms --- Gambling games --- Calculate your BMI (BODY MASS INDEX) --- Introduction to BMI --- Countdown --- Waist-to-hip ratio --- Arithmetic exercises --- Appreciation of banknotes from various countries

Registration and Instructions --- Registration --- Overview of practical software tools for chemical calculations --- Instructions -----------------------------------------------------------------------------------------------------------------------

Recent Updates Log, May 18, 2025: Main updates include: 1. Lookup of specific gravities of saturated alkane liquids at different temperatures, including methane, ethane, propane, butane, isobutane, pentane, isopentane, hexane, heptane, octane, etc., a total of ten types. 2. Lookup of the specific gravities of saturated liquids of olefins and dienes at different temperatures; this includes eight types such as ethylene, propylene, isobutylene or butene-1, trans-butene-2, cis-butene-2, isoprene, methacrylene, and butadiene-1,3. Main updates on 2024.5.18: Calculation of the reaction force exerted by the material discharged by safety valves. Common methods for calculating this reaction force include those outlined in China’s HG-T20570.2-95, as well as the methods specified in American API RP520 and ASME B31.1. The method described in China’s HG-T20570.2-95 requires the static pressure at the outlet of the safety valve discharge pipe to be provided; however, it is not clear how this value should be determined. Yet this value has a significant impact on the results, with large differences arising from different choices ； The methods specified in API RP520 and ASME B31.1 do not require the provision of the exit static pressure; however, the ASME B31.1 method requires knowledge of two gas constants, a and b (which can be found in Table II-2.2.1 of Appendix II to the ASME B31.1 standard). Therefore, the approach in API RP520 is relatively simpler. The new software is placed under the Stress-Material section. Four example problems are also attached for your reference. The illustrations are placed at the back. Main updates on 2024.2.28: 1. Correction factor for heat transfer temperature difference and calculation of effective temperature difference in shell-and-tube heat exchangers. The correction coefficients for the temperature difference in multi-pass heat transfer are generally obtained by consulting relevant manuals. What we are introducing today is a method of calculation using a small program, which may be more convenient, accurate, and faster than consulting manuals, especially when such information is not available. 2. Calculation of the overall heat transfer coefficient. When manually calculating the overall heat transfer coefficient, changing one of the parameters often requires recalculating the entire formula; this program makes it convenient for both the first calculation and subsequent recalculations. 3. Calculation of the average crystallization time for the liquid in batch crystallizers. Calculating the batch crystallization time is a time-consuming process; using this program simplifies things significantly, making it easier to optimize various aspects of batch production in order to increase output. Some of the figures are placed at the back. Main updates on 2023.2.28: 1. Calculation of the diameter and pressure drop for dense-phase static pressure pneumatic conveying pipelines. Air conveying is widely used in the chemical industry due to its many advantages. The pneumatic conveying process introduced here today requires the use of the trial-and-error method for calculation; manual calculation is rather difficult, while computer-based calculation is much simpler and more convenient, so it may be useful to you when needed. 2. Calculation of selection parameters for centrifugal ventilators. Centrifugal fans are widely used, but there seems to be little literature on how to select the pressure and flow rate of such fans in high-altitude areas where atmospheric pressure is relatively low. This program aims to explain how to calculate the required pressure and flow rate under these conditions. The new version includes many improvements over the previous version, and it is believed to be more user-friendly. The relevant drawings are provided at the end. Date: 2022.8.8. Main updates: Two calculation programs have been added: 1. Hydraulic calculation for slurry pipelines and power calculation for transfer pumps. The liquid-solid two-phase flow transportation technology is widely used in the field of mineral transport; it is said that the transportation distance can reach dozens of kilometers, with an annual transport volume of tens of millions of tons. It is less commonly used in petrochemical systems; some people use it for the long-distance transportation of materials such as polyolefin pellets. The calculation method might be unfamiliar to many people, and the formulas used are also rather peculiar. The calculation process requires the trial-and-error method in many places, so it is more convenient to use a program for the calculations. 2. Calculation of the frictional resistance coefficient for slurry pipelines and calculation of dynamic viscosity. . Both of these coefficients need to be calculated using the trial and error method, and they are used in various parts of a project; manual calculation is very cumbersome, so these two calculation programs are provided. There are six example problems provided for practice and reference. The relevant drawings are placed at the back. June 18, 2022: Main updates: Two new calculation programs were added: 1. Calculation for spray drying process. The program only performs material balance and heat balance calculations, as they are universal ； The calculation for selecting equipment was not carried out due to its limited versatility; however, it is not difficult to do so once material and heat balances are established. 2. Application calculations using the I-H diagram. Using a psychrometric chart is more convenient than doing the calculations by hand, but it is still less convenient than using a computer. Reading psychrometric charts is quite difficult because there are too many curves, making it hard to interpret them accurately. Using a program, as long as two parameters are entered – for example, temperature and relative humidity – the moisture content can be calculated; by entering temperature and moisture content, the enthalpy value can be determined. Since psychrometric charts are applicable to normal-pressure environments, it is generally known that water temperature at normal pressure cannot exceed 100°C. However, it is difficult to determine what the limitations are on humidity and enthalpy values at a certain temperature; to prevent errors, the program will provide prompts. In addition, the program offers a function beyond the psychrometric chart – the calculation of the specific volume of moist air (m3/kg of dry air), which is used to determine the air flow rates for the system’s supply and exhaust fans. Both programs are placed under the heat exchanger category; the relevant drawings are provided at the end. May 8, 2022: Main updates – Two new calculation programs were added: 1. Calculation of the length of steam tracing pipes for equipment. 2. Calculation of electric heat tracing power. The relevant drawings are placed at the back. Main updates on 2022.2.28: Three new calculation programs were added: 1. Process calculation for vertical screen separators. In this way, the calculation of the various small separators commonly used in processes is essentially covered, including the five existing calculation programs for this software: gas-liquid separators (both vertical and horizontal), liquid-liquid separators (both vertical and horizontal), and gas-solid separators (cyclone separators). The screen separator calculation also determines the liquid level height at which alarms are triggered for each point, saving everyone the need to perform such calculations manually. The program is placed in the separator section of the menu. 2. Silencer selection calculation. It mainly involves calculating the noise level at the detection points in order to configure the appropriate silencers. The program is located under the Environmental Protection and Boilers section of the menu. 3. Calculation of common polynomial equations of degree one with multiple terms. This is because I saw an example problem in a process design manual not long ago, one that required calculating a polynomial equation of degree four: 141*x^4-310*x^3+171*x^2=35400. The example demonstrated the calculation by hand, which was rather complicated and not very accurate; therefore, I thought of using a simple program to carry out the calculations, which could save some time. This program can solve up to four simple equations with x terms and a constant term; the degree of x is not limited. Friends might find it useful from time to time. Place it in the tools section of the menu. Some corresponding screenshots are attached below. -----------------------------------------------------------------------------------------------------------------------------------February 28, 2021: Main updates: Today, we present a new software – “Pressure Drop Calculation for Gas-Liquid Two-Phase Flow (Non-Flash Type)”. Gas-liquid two-phase flow may be familiar to many people, but many have probably never attempted to calculate it, as doing so is much more complicated than calculating other types of pressure drops. The Lockhart-Madley method involves up to seven different flow patterns, each with its own corresponding calculation formula, while the Duqueur method’s trial-and-error approach is even more cumbersome. Making common chemical calculations easier has always been our goal! Today, I’m sharing with you this software that is very easy to use. All you need to do is enter the calculation parameters and move the mouse a little; the results of both calculation methods are displayed instantly. The entire calculation process is simple, convenient, fast, and accurate! To verify the reliability of the software, all four example problems from the original design manual are included in it, along with example problems on two-phase flow calculations from the fifth edition (2018) of the \"Chemical Process Design Manual\"; comparative tests were conducted on these, and the calculation results were all very satisfactory! We have also listed twenty-eight intermediate parameters used in the calculation process, which can serve as a reference for verification and manual calculations. The software includes the detailed calculation procedures for two examples from the design manual – namely the Lockhart-Maddily method and the Ducler method – so that users can get familiar with the specific steps of these two manual calculation methods here first. Since there is no ready-made material available online, all attachments were created by first taking photos with our smartphones, and then using Photoshop to crop, assemble, adjust the shapes, remove yellowing, brighten the images, and eliminate unwanted colors, among other things. Haha, PS, which is usually used only for editing photos, was also used here this time! The new software is placed under Menu/Fluid Resistance/Category. The screenshot is at the end. Well, to find out whether this program is useful or not, everyone should give it a try when they have time! ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- January 18, 2021: Key updates – This update introduces a new calculation tool: the calculation of pollutant concentrations in the atmosphere. As living standards improve, people’s awareness of environmental protection is also increasing. The air quality of the surrounding environment and the concentrations of air pollutants are of great importance to **relevant departments, environmental protection agencies, planning departments, as well as construction and design firms. Since pollutant concentrations are influenced by many factors, such as the form of pollutant emission, concentration, effective emission height, surrounding terrain, climate, sunlight, wind speed, and distance from the source of emission, there are numerous different environmental scenarios, each requiring different methods for calculation. Due to the complexity of environmental scenarios, it is difficult to describe them in just a few words; as a result, users may find it hard to choose the appropriate calculation type. Therefore, this program uses a special approach: when users select an environmental type, corresponding examples are displayed to illustrate it (these examples are taken from the textbook or practice problems). If the example data matches your actual situation, you simply need to replace it with your own real-world data, fill in the details, and then click the calculation button! This program was developed based on Chapter 4, \"Models for Estimating Atmospheric Dispersion Concentrations\", of the book \"Atmospheric Pollution Control Engineering\". The program includes almost all the calculations for the important pollution dispersion patterns in Chapter 4. Now you don’t need to memorize the complex calculation formulas for various environmental conditions, nor do you have to consult difficult-to-understand logarithmic charts. All you need to do is find the appropriate example (environmental scenario), modify the relevant data, and then click the calculation button – the pollutant concentration you’re looking for can be calculated easily ； Changing parameters also only requires moving the mouse, which is much more convenient, faster, and accurate than doing it by hand! In addition, the program includes two useful tools for calculating the concentration of pollutants: one is used to determine the horizontal and vertical diffusion coefficients given the distance x from the source of pollution (the horizontal coordinate) and the level of atmospheric stability; the other is used to determine the distance x from the source and the horizontal diffusion coefficient given the vertical diffusion coefficient and the level of atmospheric stability, thus eliminating the need to refer to logarithmic coordinate charts. The software is located in the \"Eco-friendly Boilers\" section of the menu, with the illustrations placed at the end. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Key updates on 2019.12.10 and 2020.01.18: This update added three calculation programs and updated some existing ones: 1. Calculation of boiler chimney height. Calculating the chimney height is also complicated, as there are several different fractional exponents involved; trial and error methods must be used to carry out the calculations step by step. To simplify things, it is generally assumed that the temperature at the chimney outlet is known, but in reality this outlet temperature varies with the chimney height. If the outlet temperature is also treated as an unknown variable, it will make the calculations even more difficult! This program can also calculate the outlet temperature as an unknown variable, and it does so very quickly! There are also suggestions for the minimum allowable flue gas velocity, as well as appropriate chimney velocities and chimney diameters, to serve as a reference when making a choice. If the velocity you select is lower than the minimum allowable value, the program will ask you to recalculate until it meets or exceeds that threshold! The intermediate data are also listed in the calculation results section. The main program is also accompanied by calculation formulas for friends’ reference. 2. Calculation of chimney draft. Here, three common different calculation formulas are used to perform calculations based on the same known conditions; the three results are printed in the upper left corner of the graph, allowing users to compare them and choose the appropriate one. 3. Calculation of heat exchanger tube wall temperature (added on 2020.01.18). The tube wall temperature of the heat exchanger is an important parameter in its design. This program allows for calculations based on the overall heat transfer coefficient, as well as calculations based on the heat exchange area; the user can choose which method to use. 4. Calculation of the weighted average. In chemical calculations, it is common to encounter tasks such as calculating the molecular weight, specific heat, or density of multi-component compounds. To be honest, manual calculation isn’t difficult, but using a computer makes the process more convenient and faster. You just need to enter the molecular weight of each component as indicated, and then enter the percentage composition of each component as suggested. Once that’s done, the calculation result will be displayed; there’s no need to worry about how the calculation is carried out. When each percentage is entered, a reminder of the remaining percentage is shown; if the total exceeds or falls short of 100%, the program will ask you to enter the percentages again until it is correct. 5. Some existing programs have added some new features. For example, in the calculation of hydrostatic test pressure, you can now calculate for many types of steel. 6. Modification to the classification levels of GC-class industrial pipelines. This has been amended in accordance with the **Announcement by the State Administration for Market Regulation (No. 3 of 2019), “Announcement by the State Administration for Market Regulation on Matters Related to Administrative Licenses for Special Equipment”**. 7. Additional explanations have been added to the original mixing power calculation program (added on 2020.01.18). . That is, the method for estimating the mixing power when the mixer has multiple layers. The illustrations are placed at the back. ------------------------------------------------------------------------------------------------------------------------------------------------------------------2019.08.22 Main updates: This update adds three calculation programs: 1. Calculation for flow restriction orifice plates. Calculating orifice plates for flow limitation is rather complicated, mainly because for each orifice plate it is necessary to assume a flow coefficient first, and then carry out tedious exponential calculations to see if the results match the assumption; if not, another assumption must be made and the calculations repeated! If the pressure drop is large, multiple orifice plates need to be installed; for each one, assumptions must be made and calculations performed, and if the results are not satisfactory, the calculations must be repeated! Calculating a set of orifice plates can be exhausting! Moreover, due to the complexity of index calculations, mistakes can easily occur. Today, this program will **reduce your computing workload!** Because here you only need to enter the assumed flow coefficient, and the program immediately calculates the result for you to evaluate; if it’s not suitable, you can assign another value, and the program will again calculate the result right away. The calculation is carried out entirely by the program on your behalf. Once the calculation for the first plate is completed satisfactorily, the program will automatically guide you through the calculation of the second plate, followed by the third and fourth plates, until everything is finished! It is possible to calculate eight orifice plates consecutively; the program will automatically determine how many orifice plates are required. 2. Calculation of wall thickness for straight pipes under internal pressure and for bent pipes. These two calculations focus on the determination of the pipe wall thickness, with the nominal wall thickness being determined by the user based on the standard selected. 3. Calculation of blind plate thickness. This calculation is not difficult either, but using a calculator makes it a bit more convenient and faster. ------------------------------------------------------------------------------------------------------------------------------------- Update on 2019.06.08: Three calculation programs were added: 1. Calculations for the NPSHr, NPSHa, and installation height of centrifugal pumps ； NPSHr is generally provided by the manufacturer, but can be calculated by the user if it is not available. The calculation of NPSHa and the installation height has to be done by the user themselves; with this program, it is believed that it will help you out! 2. Calculation of the burst disc discharge area ； Blowout valves are used less frequently than safety valves, but they have many advantages: they are particularly suitable for applications with viscous media, sediments, or powders; they have a simple structure, respond quickly, do not leak, are resistant to corrosion, can operate over a wide range of temperatures and pressures, their diameter can reach 1 meter, they require no special maintenance, and they are easy to replace. Of course, they lack advantages such as the ability to reset automatically that safety valves possess. 3. Calculation of the spacing between horizontal straight pipe supports and hangers. Normally, we* call it the pipe span. Judging from the results, it seems that the requirements now are higher than before. In the past, the requirements were a bit lower, but it was still used for decades. As for which method to use, it’s up to the user to decide; both calculation methods are available in this program. I think in situations where there is significant vibration inside the device or where high standards are required, strict rules should be applied; in other situations outside the device, the rules can be relaxed a bit. The illustrations are placed at the back. -------------------------------------------------------------------------------------------------------------------Update on 2019.03.16: At the request of some friends, we have made the compilation layout movable today. This way, when your computer screen is relatively small or when you are using a laptop and part of the layout isn’t visible, you can use the mouse to move the layout around, allowing the previously hidden parts to become visible. This time, the version number has also been changed to 6.6.8.2.----------------------------------------------------------------------------------------------------------------------------Updates on 2019.02.18: Friends, \"A Collection of Practical Software Tools for Chemical Engineering Design\" will be celebrating its 5th anniversary by the end of this month (February 2019)! Here, we sincerely thank all the moderators and friends for their constant enthusiastic encouragement and support! Thank you! Recently, we made some revisions to the layout of this compilation in order to make it more modern, easier to use, and provide clearer results. We have restored the software applications that were not available in the menu of the previous version; additionally, a software tool for calculating vent valves has been added. The title of the compilation was changed from “Compilation of Practical Software Tools for Chemical Engineering Design” to “Compilation of Practical Software Tools for Chemical Engineering Calculations”, and the version number was updated to 6.6.8. The vent valve calculation software is placed in the valves category, with the accompanying drawings at the back. ---------------------------------------------------------------------------------------------------------Updated on August 22, 2018: 1. Calculation of pipe wall thickness or horizontal internal pressure vessel wall thickness. Typically, the wall thickness of pipes is determined based on pipe grade tables or experience, but when the operating conditions are severe—such as high pressure, high temperature, or increased corrosion—it is necessary to verify whether the wall thickness is safe. This program can also be used to calculate the wall thickness of horizontal internal-pressure vessels. When calculating the additional value for the negative deviation in pipe wall thickness or container wall thickness, it is necessary to know the final design wall thickness first; yet to determine the design wall thickness, one again needs to know the additional value for the negative deviation in wall thickness. This is a contradiction – what should be done? This problem can be easily solved with this program! 2. Calculation of pipeline span. There are various methods for calculating pipe span distances, and these values can usually be found in design manuals. When no such information is available or the situation is special, it is convenient to use this program to carry out the calculations oneself. 3. Calculation of the orifice diameter for pressure regulation. Pressure regulating orifice plates are suitable for pipelines with stable flow rates and less stringent pressure regulation requirements, such as those used for heating systems. 4. Dew point calculation. It can be calculated by entering the dry-bulb temperature and relative humidity of the moist air. Screenshots of some programs are provided at the end. -------------------------------------------------- Friends, to assure you that you can use this software with confidence, I am now sharing with you the report showing that it has passed the security inspection by 360 Antivirus. The full text of the 360 inspection is as follows: Congratulations, the software you submitted has passed the inspection by the 360 Software Open Platform. Hello! According to the tests conducted by 360 Software Security Center, the software version \"Software Huimei (W) 2.10 Final Version--2014082218\" (ID: 1770443), which you submitted on 2014-09-18 at 16:51:52, has passed the security checks and has been integrated into the 360 Cloud Security system. Notes you submitted: I spent many years developing a set of chemical engineering design software – \"A Collection of Practical Software Tools for Chemical Engineering Design\" – which was published on a well-known national chemical engineering website, the Haichuan Chemical Engineering Forum, and made available free of charge for use by those working in the field of chemical engineering. Since its release, it has been very popular; however, false positives by antivirus software have deterred some users. Therefore, we hope you can provide clarification as soon as possible, so that more software that is beneficial to social productivity can be promoted without being harmed by false positives from antivirus software! Please refer to the software testing standards of 360 Software Open Platform: http://open.soft.360.cn/guide/guide_2.html?i=4. Below are some accompanying diagrams: