Description of the device
— English Vacuum spray degassing — 20.05.2019
4.2 Identification
The nameplate provides information about the manufacturer, the year of manufacture, the manufacturing number and the
technical data.
Information on the type plate
Type Device name
Serial No. Serial number
min. / max. allowable pressure P Minimum/maximum permissible pressure
max. continuous operating temperature Maximum temperature for continuous operation
min. / max. allowable temperature / flow temperature TS Minimum / maximum permissible temperature / TS flow temperature
Year built Year of manufacture
min. operating pressure set up on shop floor Factory set minimum operating pressure
at site Set minimum operating pressure
max. pressure safety valve factory - aline Factory set actuating pressure of the safety valve
at site Set actuating pressure of the safety valve
4.3 Function
The device degasses the water from the facility system and the fresh water from the make-up line. It removes up to 90 % of the
dissolved gases from the water. The degassing operation uses timer-controlled cycles.
A cycle comprises the following phases:
1. Pump down to create a vacuum
The “PU” pump creates a vacuum. The “DC” feed (during “WC” make-up degassing) to the pump is open. Gas-rich water is
sprayed into the spray tube via a nozzle. The system is set up so that the pump draws more water from the pipe that can flow
through the nozzle.
2. Injection
The inlet to the "PU" vacuum pump is opened. Depending on the actual demand, a partial flow of the gas-rich system water
of the facility system or the fresh make-up water are introduced through the "DC" or "WC" lines of the device. The water is
then finely atomised in the vacuum pump. The large surface of the atomised water and the large gas saturation headway to
the vacuum result in a degassing of the water. The degassed water is returned to the system via the vacuum pump.
3. Discharge
The "PU" vacuum pump shuts off. The system continues to atomise and degas water. The water level in the vacuum pump
rises. The gases separated from the water are discharged into the surrounding atmosphere via the "DV" degassing valve.
4. Idling time
When the gas has been discharged, the device will remain idling until the next cycle is started.
Degassing cycle in the PU vacuum pump
Cooling water system ≤ 30 °C, System pressure 1.8 bar, "DC" system degassing in operation, "WC" make-up degassing closed.
1 Pump down to create a
vacuum
2 Injection
3 Discharge
4 Idling time
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