What is a pressure vessel and what does it do?

What is a pressure vessel? In industrial and semi-industrial water purification devices, reverse osmosis membrane filters are placed inside highly pressure-resistant chambers called pressure vessels.

What is a pressure vessel and what is its function?
Pressure vessels are used to place a large number of membranes in series with different capacities and sizes. Of course, the vessels are divided based on the number of membranes, the pressure of the water treatment device, and the diameter of the membrane, which usually accommodates between 1 and 8 membranes.

What parts is a pressure vessel equipped with?
What are the most important parts of a pressure vessel? And what components and parts are vessels equipped with? We have listed them below:

Membrane housing or the main shell, which is made of fiberglass and houses the membranes
Victalic fittings for connecting the inlet and outlet pipes
End caps that are used to seal the pressure vessel
Permit connectors, through which the initial and final membranes are connected to each other to complete the water path from the inlet to the device to its outlet.