The document discusses the instrumentation and control of deaerators, which are used to remove dissolved gases, particularly oxygen and carbon dioxide, from water. It describes different techniques for gas removal, including reducing pressure and increasing temperature, as well as types of deaerators such as tray and spray types. Additionally, it outlines three control systems for deaerators: level control, modified level control, and pressure control.

1. Instrumentaion & Control of Deaerator
M. Saad Arshad 2011-CH- 151
University of Engineering & Technology Lahore,
Pakistan

2. Deaerator
 Used for removal of dissolved gases
 Remove oxygen down to level of 7ppb
 Essentially eliminate carbon dioxide

3. Techniques used to dissolved gases
 Mainly two types of techniques are used.
i. Reduce the pressure
i. Rise the temperature to saturation

4. Deaerator Types
 Tray type
It involved:
i. Vertical deaeration section
ii. Horizontal cylindrical vessel
 Spray type
Horizontal cylinder that serve both
i. deaeration section
ii. Storage tank

7. Control system
There are three types of control system.
i. Deaerator level control
ii. Modified level control
iii. Deaerator pressure control