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High pressure may be obtained from an external source, a process reaction, by the application of heat from a direct or indirect source, or any combination thereof.
Typical applications are refinery processes (hydro cracking) or chemical processes (reactors) which have special requirements when using high-strength steels and wall thicknesses of up to 250 mm with high weights.
Other areas of application are hydrogen refueling stations and storage systems or other liquid gas application require design pressures up to 1000 bar= 14500 PSI.
It is not generally specified at what point one speaks of “high pressure”, but some Codes and Rules then require special measures in design, manufacture and testing, e.g. ASME Code Section VIII Div. 3. (MAWP >10000 PSI = 690 bar).