What are the water quality requirements of medium pressure steam boiler feed water?

The main water quality indexes of medium and high pressure steam boiler water are hardness, dissolved oxygen, iron, copper, sodium and silicon dioxide.

The water quality requirements of 3.8~5.8MPa medium pressure steam boiler:

The hardness of water is less than 3μmol/L, Dissolved oxygen is less than 15μg/L,

The content limits of iron and copper are 50μg/L and 10μg/L, respectively.

Sodium ions should not be detected.

The water quality requirements of 5.9~12.6MPa medium and high pressure steam boiler:

The hardness of water is less than 2μmol/L, Dissolved oxygen is less than 7μg/L,

The content limits of iron and copper are 30μg/L and 5μg/L, respectively.

Sodium ions should not be detected.