This standard specifies the terms and definitions, product marking, basic requirements, performance requirements, test methods, inspection rules, marking, packaging, transportation and storage of sulfur trioxide flue gas conditioning systems for electrostatic precipitators. This standard is applicable to dust collectors in electric power, building materials, metallurgy, chemical industry, light industry and other industries; sulfur trioxide flue gas conditioning systems using sulfur (solid or liquid) as raw material (hereinafter referred to as flue gas conditioning systems).