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四、 Classified by boiler outlet working pressure

1. Low pressure boiler: general pressure is less than 1.275MPa; 2. medium pressure boiler: general pressure is 3.825MPa; 3. high pressure boiler: general pressure is 9.8MPa; 4. ultra high pressure boiler: general pressure is 13.73MPa; 5. subcritical Pressure boiler: general pressure is 16.67MPa; 6. supercritical pressure boiler: general pressure is 22.13MPa.