Tank under pressure or not under pressure is a container designed to contain gases or liquids at 
a pressure different from the external one. 
Usually the fluid contained in the container is at a pressure higher than the external pressure.

Some examples of pressure vessels are: damping lungs for alternative compressors, 
distillation columns in refineries and petrochemical plants, nuclear reactor vessels, gas and liquid tanks.


The term autoclaving, is a tank with a type of hermetic sealing in which the positive pressure 
difference between the inside and the outside, of the container facilitates the seal. 
The system "closes by itself."



The systems pre-assembled on SKID can be considered all those plants, or part of them, that for 
their relatively compact size can be manufactured out of work and not obligatorily at the site or 
plant of the Customer ..