Boiler deaerator is the pressure vessel
Commonly used boilers use heat deoxidizer. According to the different working pressure can be divided into: vacuum type, atmospheric type and three kinds of high pressure type, the vacuum type is often referred to as the low pressure and atmospheric type deaerator, suitable for medium and low pressure boiler feed water deoxidization, high-pressure type deaerator pressure higher than effect, often used for high pressure boiler water supply and deoxidization. All of these are the pressure vessel manufacturing norm... It is.
Not necessarily, look at the pressure and the temperature. Thermal removal of oxygen, high, usually not. Sponge iron is not a pressure vessel.
The boiler deaerator is the pressure vessel to see the pressure setting of the work. If the maximum working pressure is less than 0.1 MPa, it is not a pressure vessel. General deaerator pressure is much less than one kilogram.
B: yes. Under the state regulations, the pressure volume is greater than 25 liters. Kg is the pressure vessel. It's perfectly satisfied.