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| Element | Description | Element Code | Essential | Uniclass 2015 |
|---|---|---|---|---|
| Pressure System | A pressure system, which includes all plant/systems that contain a 'relevant fluid', defined as steam or gas under pressure and liquids under pressure which become gases upon release to the atmosphere, at a pressure greater than 0.5 bar (about 7psi) above atmospheric (except for steam). | PSY | No | Ss_55_20_60_15 |