Steam boilers and steam boiler feed water should generally be used outside the furnace chemical water treatment, water quality should be in line with the requirements of Table 1: industrial boiler water quality standards (GB1576) applies to water as a medium of fixed steam boilers and steam boilers, also applies to water as a medium of fixed pressurized hot water boilers and atmospheric hot water boilers. The steam quality requirements are not high and no superheater boiler, in the user reported to the local boiler and pressure vessel safety inspection agency for approval, the upper limit of the alkalinity index can be appropriately relaxed.