--- If the boiler is not used for about 2 or 3 days, the pressurized method can be adopted.
      --- Once the boiler is shutdown, the pressure is reduced naturally. (Row can temporarily don't understand)
      --- When the boiler pressure is reduced to 5.0MPa, the chemical inspection of water quality should be carried out. If the water quality is not qualified, water should be changed. And the primary door and the secondary door for the given row should be closed and the terraced row should be sectionalized until the boiler water is qualified.
      --- When the boiler pressure is before 0.5MPa, the boiler water must be qualified.
      --- When the boiler pressure is more than 0.5MPa and the superheater wall temperature is below 200℃, fill pressure to the boiler by adding water to boiler.
      --- The corrosion prevention method are normally be maintained to be within 2.0MPa to 3.0MPa. The highest one should not be more than 5.0MPa, and the lowest one should not be lower than 0.5MPa.
      --- Due to some reason, when the pressure is reduced to be below 0.5MPa (when the pressure reaches to 0), it must be fired again and the pressure should be raised to 4.0MPa, besides, pressure should be increased again according to the above specification.
      --- Make records after pressure filling, and the chemical testing of dissolved oxygen should be noted.