Pressure System

System of vessels, pipes, and other equipment operating with an internal pressure exceeding atmospheric.

Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards

Pressure System

“Pressure system” means a boiler, pressure vessel, pump, compressor and the piping system connected thereto that contains or is intended to contain a gas, vapour or at a pressure greater than atmospheric pressure.

Source:  Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. Regulations

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