Pressure Vessel designing?

A pressure vessel for high pressure membrane filtering must have the strength to contain, with the appropriate safety factor and over pressure relief valves, the working pressure. The filter bed must be supported with a fine grain support that is also strong enough to maintain the working pressure above to the low pressure (ambient) beneath it.

It also needs the means to open and change filters, and reclamp, in a reasonable time.

http://www.google.ca/#hl=en&source=hp&q=industrial+%2Bmembrane+%2Bfilter+%2B%22high+pressure%22&btnG=Google+Search&meta=&aq=f&oq=industrial+%2Bmembrane+%2Bfilter+%2B%22high+pressure%22&fp=534f85b8644f63ce

this search should provide data for you, so drill down as many pages as you need to gather information.

This is not a task for an amateur, pressure vessls like this must be made to ASTM standards and be tested annually or so. This will show people who use them

http://www.google.ca/#hl=en&safe=off&q=astm+%2Bschedule+%2Bmembrane+%2Bfilter+%2B%22high+pressure%22&meta=&fp=534f85b8644f63ce

and here is ASTM

http://www.astm.org/