Introduction
A Deaerator (DA Vessel) is a critical boiler auxiliary pressure vessel designed to remove dissolved gases such as oxygen and carbon dioxide from feedwater, ensuring protection of boiler tubes, piping, and other equipment from corrosion. By reducing oxygen and gas content, deaerators improve boiler efficiency, reliability, and longevity in power plants, industrial processes, and utility systems.
At NORDSTONE., we design and manufacture ASME-certified deaerators with robust construction, precise thermal and hydraulic design, and compliance with international standards, including ASME Section I & VIII, NB, and PED certification.
What is a Deaerator (DA Vessel)?
A Deaerator is a pressure vessel that heats feedwater to near-boiling temperatures and vents dissolved gases, using either steam injection or spray methods. The deaerated water is then supplied to the boiler drum, preventing corrosion, pitting, and scaling.
Key components include:
- Cylindrical pressure vessel shell with dished ends
- Steam injection nozzles or spray heads for water heating
- Vent connection for removal of non-condensable gases
- Feedwater inlet and outlet
- Level and pressure instrumentation ports
- Manways for inspection and maintenance
- Optional storage section for feedwater to balance system demand
Deaerators are essential for protecting high-pressure boilers, reducing maintenance, and ensuring continuous steam quality.
