In order to achieve these goals, it is necessary to choose an effective way to preserve equipment that will provide the best protection of corrosive surfaces from excessive humidity.
The main reason for occurrence and development of corrosion, and as the consequence for destruction of surfaces of units and mechanisms of the above-listed equipment is uncontrolled humidity.
At high relative humidity of 60-100% the rate of corrosion processes in steel is 100 – 2000 times higher than at a lower humidity of 30-40%.
The mechanism and rate of atmospheric (stationary) corrosion depends primarily on the humidity-level of the surface of the corrosive metal.
For example for boiler steels the critical relative humidity is 60%. At humidity higher than 60% the speed of atmospheric corrosion drastically increases g/m2h. As a result the thickness of the steel can reduce by up to 0.057 mm / year.
Dry air preservation retains the quality of equipment reduces repair and reconstruction costs by maintaining the safe parameters of the thermal power plant during shutdown.