Three type of system are in use
They are as follows
Static pressurization
Maintenance of an overpressure within a pressurized enclosure without the addition of protective gas in a hazardous area
Pressurization with leakage compensation
Maintenance of an overpressure within a pressurized enclosure so that, when the outlet apertures are closed, the supply of protective gas is sufficient to compensate for any leakage from the pressurized enclosure and its ducts
Pressurization with continuous flow of the protective gas
Maintenance of an overpressure within a pressurized enclosure with continuous flow of the protective gas through the enclosure
Which system you employ dictates the cirtification assessment requirements along with the Zone of Use.
These systems are suitable for use in Zone 1 and 2
