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Oxygen Removal Vent
To completely remove the oxygen in a dry pipe and preaction fire sprinkler system, it is necessary to install
a vent on the main riser of each fire sprinkler system. Vents allow for a system to breathe, which requires
a 3-5 psig (.2-.3 bar) pressure range to facilitate removal of oxygen gas from the system. Supervisory
nitrogen gas is supplied to the system until the air maintenance device reaches the high-end pressure.
The vent slowly releases the gas mixture inside the sprinkler system through the restricted orifice until
the system reaches the low-end pressure at which point supervisory nitrogen is supplied to the system
again. This process is repeated numerous times until the atmosphere inside the piping network reaches
at least 98% nitrogen. The vent is crucial for expedient mixing of the gas and elimination of oxygen inside
the system within the specified timeframe.
ECS offers three (3) DPNI vents, the PSV-D/(DE) SMART Vent, the PAV-D Standard Vent and the PAV-DQ
Vent.
• The PSV-D/(DE) SMART Vent is an automated vent that when activated will automatically vent for
the necessary amount of time to achieve the desired inert inner pipe atmosphere, and
automatically close when the process is completed. This process is initiated by pressing the “Vent”
pushbutton on the vent’s control panel.
• The PAV-D Standard Vent requires an operator to open the vent’s isolation valve when venting is
desired, and after a specified time (typically 14-days or less) when the breathing process is
completed, the isolation valve on the vent must be manually closed.
• The PAV-DQ Vent in conjunction with AdvancedIQ Vent Controller (AVC) is an automated vent
that when activated will open and vent for the necessary amount of time to achieve the desired
inert inner pipe atmosphere, and close automatically when the process is completed.
Oxygen Removal Vent Features
The oxygen removal vents with the ECS patented “fill and purge” breathing technology include the
following features:
• Removal of corrosive oxygen from the entire sprinkler system in fourteen (14) days or less
• All equipment is installed in the sprinkler riser room for easier installation and servicing
• No support hanger required
• Backpressure regulator preventing system depressurization from vent
• In-line filter to protect restricted venting orifice from contamination
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