Internet service has now become available to anyone who has a personal computer and as more computer networks have been built. One can take advantages of the internet anywhere and anytime. Many web sites have been built according to personal needs, for example, personal homepages, on-line newspapers, search sites etc. Besides, many web users who are attracted by engineering calculation have studied to have the calculation and cost estimate done in the web based environment.
So in this study, we have developed a design and cost estimation tool for pressure vessels in the web based environment by using javascript, ASP (Active Server Pages) and MS-SQL (Structured Query Language) database. The tool is based on the ASME Boiler and Pressure Vessel code section VIII Div 1. The execution of engineering calculations is done with javascript. The performance of this program has been verified by both manual calculation and BASIC program. In the near future, many web applications for engineering calculation in the web based environment will become popular.