This standard specifies the basic principles and requirements that should be followed in the design of flue-type waste heat boilers. This standard is applicable to water pipe and smoke tube type fixed waste heat boilers that use water as the medium, the rated steam pressure is not greater than 3.82MPa, and the rated steam temperature is not greater than 450°C. For fixed waste heat boilers with a rated steam pressure greater than 3.82MPa and less than 5.88MPa and a rated steam temperature not greater than 450°C, this standard may be followed. This standard is not applicable to once-through waste heat boilers, heat pipe waste heat boilers and hot water waste heat boilers.