Deaerator Steam Consumption

The steam spent bringing feedwater to deaerator temperature, and its share of the boiler load.

Unit system

Inputs

Feedwater flow

Steam production plus blowdown. Comes from the Blowdown Rate calculation.Deaerator pressure (absolute)

Typically 0.2–0.5 bar g. Higher pressure deaerates better but costs more steam.Mixed inlet temperature

The mix of makeup water and returned condensate. More condensate return raises it and cuts the steam bill.Supply steam pressure (absolute)

Vent loss fraction

Steam vented with the gases. Typically 0.2–0.5 %. It cannot be zero — a closed vent traps the gas too.

Deaerator steam use

911.7kg/h

Share of feedwater

0.0887

Deaerator temperature	111.4 °C
Vented	30.82 kg/h
Heating duty	615.9 kW
Makeup plus condensate inflow	9,393 kg/h

Mixing is taken as adiabatic; the vessel’s surface loss is not included (small on an insulated deaerator).
This steam never reaches the process. Boiler capacity must cover production PLUS the deaerator’s own use.

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Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.