Sodium sulfite is used as a dissolving oxygen scavenger chemical in the water supply treatment of medium pressure boilers. Removing water-soluble oxygen means a significant reduction in the amount of corrosion in the system. Sodium sulfite combines with dissolved oxygen to produce sodium sulfate as a result, oxygen will not be able to react with the metal surface. The best place to inject sodium sulfite is into the air outlet or water pump input into the boiler. If this is not possible, it should be injected at a point as far ahead of the boiler as possible to allow time for interactions with dissolved oxygen.
Calibration of Using Mitreh 760 Solution:
In order to prevent of corrosion in medium pressure boiler systems, the dosage varies according to the amount of water dissolved oxygen and other physical and chemical parameters and it is calculated more accurately by the technical experts of the company.
In the first few weeks of use, this inhibitor should be used at a rate of two to three times that of normal to produce the best film on the whole metal surface (primary treatment).
Some Physical Properties of the Solution:
|Liquid||Physical state||5.1 – 5.5||pH|
|Light yellow||Color||96 – 99||Boiling temperature range (˚C)|
|Odorless||Odor||-1 – 2||Freezing temperature range (˚C)|
|1.05 – 1.056||Density at 20˚C (gr⁄ml)||Dissolves rapidly||Solubility in water|