how to design a concrete foundation of a pressure vessel?
Shan:
The design of the concrete footing or foundation for a pressure vessel should not be any different from the basic principles of foundation design for any other type of structure.
Below is one link to a document posted on the web from Texas A&M. I am sure that there are others which would provide you guidance.
Additionally you will need to tie the pressure vessel into the foundation and the mounting points on the foundation in accordance to the standard engineering practices of your locality.
Niel Leon
engineering.com