Auxiliary plant for use with boilers of heading 8402 or 8403
Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof: > Auxiliary plant for use with boilers of heading 8402 or 8403
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Subheadings
Products classified under HTS 8404.10.00
Boiler Economizer
A heat recovery device installed in the flue gas path of steam boilers (headings 8402 or 8403) to preheat feedwater using residual heat from exhaust gases, improving overall boiler efficiency. It qualifies under HTS 8404.10.00 as auxiliary plant specifically designed for use with those boilers. Typically constructed from finned tubes and steel casings to withstand high temperatures.
Boiler Superheater
A component that heats steam beyond its saturation point after leaving the boiler drum, increasing energy content for turbine use in power generation. Classified under HTS 8404.10.00 as auxiliary plant for boilers of 8402/8403 due to its direct integration in the steam cycle. Constructed with high-temperature alloy tubes to handle superheated conditions.
Flue Gas Heat Recovery Unit
Auxiliary system capturing waste heat from boiler exhaust gases to preheat combustion air or generate hot water. Qualifies under HTS 8404.10.00 as gas recoverer auxiliary plant for 8402/8403 boilers. Modular design with stainless steel recuperators for industrial applications.
Boiler Air Preheater
Rotary or tubular device that preheats combustion air using boiler flue gas heat, reducing fuel consumption. Classified as auxiliary plant under HTS 8404.10.00 for direct use with 8402/8403 boilers. Regenerative designs common for large utility boilers.
Retractable Soot Blower Lance
Extendable lance system delivering cleaning media to boiler tube banks, retracting to avoid interference during operation. HTS 8404.10.00 covers it as soot remover auxiliary for 8402/8403 boilers. Wall-mounted with automated sequencing controls.
Deaerator for Boiler Feedwater
Vessel that removes dissolved oxygen from feedwater to prevent boiler corrosion, using steam scrubbing. Functions as auxiliary plant under HTS 8404.10.00 when integrated with 8402/8403 boiler systems. Tray or spray-type designs for high-capacity plants.
Soot Blower for Boilers
Automated device using steam, air, or water jets to remove soot and ash deposits from boiler tubes and heat transfer surfaces, maintaining efficiency. Falls under HTS 8404.10.00 as a soot remover, explicitly listed as auxiliary plant for 8402/8403 boilers. Available in retractable or rotary lance configurations for various boiler sizes.
Steam Power Unit Condenser
Shell-and-tube heat exchanger that condenses exhaust steam from turbines back to water in vapor power cycles, enabling reuse in boilers. Covered by HTS 8404.10.00 as condensers for steam power units associated with 8402/8403 boilers. Features vacuum-tight construction and non-ferrous tubes for corrosion resistance.