The NSAS software was officially released online

Thread Content

The last edit to this post was made by Baiyu_EliRI on June 12, 2023, at 17:07. The online version of the NSAS software for analyzing the strength of pressure vessel nozzles, developed by Beijing Sigma Simulation Technology Co., Ltd. (referred to as NSAS software), has finally been released! The NSAS software has now become an essential auxiliary analysis, design, and calculation tool for pressure vessel equipment in various engineering companies such as SEI, Chengda, and Tianchen. The introduction of the online version of NSAS enables manufacturers to meet their needs for analyzing and calculating equipment connections at a very low cost. This not only facilitates use by engineering designers and improves work efficiency but also allows manufacturers to play a more active role in projects carried out in collaboration with various design firms. Users do not need to purchase a license; they simply need to download and register to start using it. No fees are charged during the computation process, and only a very low fee is charged per report downloaded (for specific fees, please refer to the official website of the NSAS software’s online version), which is far lower than the cost of outsourcing computations! All friends are welcome to download and register for a trial experience; there are benefits available for those who register and try it out in the initial stage! ! ! Download link for the online version of NSAS software: https://www.sigmacax.com/Download/6-cn.html
I. Introduction to NSAS Online
NSAS Online (Nozzle Strength Analysis System), also known as a software for analyzing the strength of pressure vessel nozzles, is a specialized finite element analysis tool developed by Beijing Sigma Simulation Technology Co., Ltd. It enables local stress analysis and strength assessment of various types of vessel nozzles commonly used in the pressure vessel design industry. NSAS Online currently offers various types of directional nozzles for shells in 8 categories: nozzles on cylindrical shells, nozzles on elliptical heads, nozzles on right-cone shapes, disc-shaped and hemispherical heads, nozzles on flat tops, flanges, and lug-type supports (radial nozzles, eccentric nozzles, and inclined nozzles at any angle on cylindrical shells) ； Right circular cone radial, normal, and eccentric nozzles ； Stress analysis models for the axial, normal, and eccentric nozzles of each head, as well as for the local structures ； Parameter control is provided for the chamfering and rounding of the surface details in the weld area connected to the housing ； Each model offers three types of nozzles: unreinforced, reinforced with a ring, and reinforced as a single forged piece ； The load forms take into account internal pressure and nozzle loads (three-dimensional forces and three-dimensional moments). For most shell nozzles encountered in actual engineering design, finite element models can be automatically established for stress analysis and strength assessment. The NSAS Online interface has been optimized to fit the workflow of pressure vessel engineers. Users only need to select the appropriate module based on the way in which the nozzles are connected to the vessel shell, enter parameters related to geometry, materials, and loads, and the software will automatically create a finite element model and carry out stress analysis calculations. Users do not need to learn how to create geometric models or perform meshing, as is required when using general finite element software, allowing them to master the use of this software quickly. In the software, tasks such as finite element meshing of the model, loading calculations, post-processing of results, and generation of stress analysis reports are all carried out automatically and optimally. Once the stress analysis is completed, the program automatically identifies the critical paths for stress linearization, and performs stress classification and verification in accordance with the JB4732-95 standard \"Steel Pressure Vessels – Analysis and Design Standards\" (confirmed in 2005). A detailed stress analysis report is then generated automatically. The entire process is swiftly completed by our company’s proprietary finite element calculation module, without any need for manual intervention. In 2014, NSAS passed the expert technical evaluation organized by the China Special Equipment Safety and Energy Conservation Promotion Association; the experts gave high praise to NSAS. The evaluation records and list of experts are shown in the figures below: Figure 1 shows the evaluation comments for NSAS, while Figure 2 lists the experts who conducted the evaluation. Unlike traditional software that relies on license keys to control computations, users only need to register and log in to NSAS Online using their mobile phone numbers in order to carry out analyses of pressure vessel nozzles. In this process, the user only needs to select the port to be analyzed, enter the relevant parameters and operating conditions, perform the calculations, view the report, and save it. NSAS Online adopts a model of single calculation, generation of an analysis report, and single payment; users do not need to purchase all analysis modules – they only need to select the models they wish to analyze and pay for those. NSAS Online is a permanent version designed for long-term use; users can continue to utilize it and have it updated regularly. Updates are delivered online, ensuring that the NSAS Online program in use by users is always the latest version. II. Comparison between NSAS and the general-purpose finite element analysis software ANSYS: NSAS Online employs a large sparse matrix solver with independent intellectual property rights, featuring stability, fast speed, and high precision. NSAS and ANSYS use the same finite element mesh model and set the same boundary conditions for finite element analysis, but they carry out the calculations separately. After the solution is obtained, the same stress linearization approach is used in both NSAS and ANSYS. The calculation results from NSAS and ANSYS are extracted and summarized in the table below: Comparison Results ANSYS NSAS Error SX 12.49 12.49 190.015% SY 13.94 13.93 70.022% SZ 9.96 19.96 1220.002% SXY 0.2017E-3 0.0002 2022410.268% SYZ -0.1431E-3 -0.0001 435010.280% SXZ -9.579 -9.579 310.003% S1 20.77 20.772 70.013% S2 13.94 13.937 70.022% S3 1.410 1.4104 40.031% SINT 19.36 19.362 220.011% SEQV 17.01 17.007 90.012% As can be seen from the table above, the errors in the calculation results obtained by NSAS and ANSYS are all below 1%, indicating that the accuracy and reliability of NSAS’s calculations are fully sufficient for engineering design purposes. III. Price Details for NSAS Online The NSAS Online version requires users to register and make payments; during the software’s promotion period, discounts are offered on such payments, with the details listed in the table below. This discount scheme is currently in trial phase, lasting until August 31, 2023. Beijing Sigma Simulation Technology Co., Ltd. retains the right to make final decisions regarding this discount scheme. The price details for NSAS Online are as follows; these prices are valid until August 31, 2023:
**Module Category** | **Sub-module Price (RMB per session)** | **Model Creation/Calculation/Report Viewing/Report Saving**
--- | --- | ---
Unreinforced pipe connections on cylindrical heads – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Inclined: Free | 1,598.00
Reinforced pipe connections on cylindrical heads – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Inclined: Free | 1,598.00
Forged-reinforced pipes – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Inclined: Free | 1,598.00
Unreinforced pipe connections on elliptical heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Reinforced pipe connections on elliptical heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Forged-reinforced pipes – axial: Free | 1,998.00 | Normal: Free | 1,598.00
Unreinforced pipe connections on conical heads – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Normal: Free | 1,598.00
Reinforced pipe connections on conical heads – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Normal: Free | 1,598.00
Forged-reinforced pipes – radial: Free | 1,598.00 | Eccentric: Free | 1,598.00 | Normal: Free | 1,598.00
Unreinforced pipe connections on butterfly heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Reinforced pipe connections on butterfly heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Forged-reinforced pipes – axial: Free | 1,998.00 | Normal: Free | 1,598.00
Unreinforced pipe connections on spherical heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Reinforced pipe connections on spherical heads – axial: Free | 1,998.00 | Normal: Free | 1,998.00
Forged-reinforced pipes – axial: Free | 1,998.00 | Normal: Free | 1,598.00
Unreinforced pipe connections on flat plates – vertical: Free | 1,598.00 | Inclined: Free | 1,598.00
Forged-reinforced pipes – vertical: Free | 1,598.00 | Inclined: Free | 1,598.00
Unreinforced ordinary elbows: Elbow connection: Free | 1,598.00
Ear-type supports without shims – Type AN: Free | 1,598.00 | Type BN: Free | 1,598.00
With shims – Type NBT: Free | 1,598.00 | Type A: Free | 1,598.00 | Type B: Free | 1,598.00
Flange connections – Axial Flange I: Free | 1,998.00 | Flange II: Free | 1,998.00
Normal flange I: Free | 1,998.00 | Flange II: Free | 1,998.00
If you are interested, you can click the following link to download the software: NSAS V4.0 Online (online version).
Introduction to NSAS Pressure Vessel Nozzle Strength Analysis Software: NSAS Pressure Vessel Nozzle Strength Analysis Software (hereinafter referred to as NSAS) is a finite element analysis software developed by Beijing Sigma Simulation Technology Co., Ltd. It is used for calculating the strength of large-opening structures commonly found in the pressure vessel design industry. It combines a simple and intuitive software interface, an encapsulated finite element analysis process, and professional analysis and calculation reports, which can significantly improve engineers’ work efficiency; it is an essential and valuable tool for engineers. NSAS currently provides a library of model elements in 5 main categories, including openings in cylindrical shells, right-cone openings, and openings in disc, spherical, and elliptical heads, as well as two types of auxiliary models: supports and flanges ； The weld area provides a foot-of-slope form or a rounded corner form ； The reinforcement forms include three types: no reinforcement, ring reinforcement, and full-forged part reinforcement ； The load types include internal pressure and nozzle loads, with the nozzle loads capable of applying forces and moments in three directions. Strength calculation and analysis can be performed for most opening structures encountered in practical engineering design. The NSAS interface is user-friendly and easy to operate; users only need to enter the geometric, material, and loading parameters of the structure to carry out calculations. Users can master the use of the software quickly without requiring any specialized training. In the software, the finite element mesh generation, loading calculations, and result generation are all automatically optimized by the program. After the calculations are completed, the program automatically selects the appropriate approach and performs stress classification and verification in accordance with the JB4732-95 standard. Finally, a calculation report is generated automatically; the entire process is carried out swiftly in the background without any manual intervention. NSAS can be used either during the quotation phase or the detailed design phase; it enables simple and fast calculations, with results available within minutes. It can provide calculations for local stress analysis, as well as serve as a checking tool prior to conducting a comprehensive stress analysis of the entire device.