Parts
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: > Parts
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 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 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(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 8404.90.00.00
Economizer Tube Bundle
A heat exchanger assembly consisting of finned tubes designed to recover waste heat from flue gases in boiler systems, preheating feedwater to improve efficiency. It is classified under HTS 8404.90.00.00 as a part of auxiliary plant for boilers of headings 8402 or 8403. This component enhances overall thermal performance in steam power units.
Superheater Coil Assembly
Coiled high-temperature alloy tubes that superheat saturated steam from boilers to increase energy content and efficiency in power generation. Classified as parts under HTS 8404.90.00.00 for auxiliary plant used with boilers of 8402 or 8403. Essential for turbine performance in steam power units.
Soot Blower Element
Retractable lance or rotary assembly with nozzles that inject steam or air to dislodge soot from boiler tubes, maintaining heat transfer efficiency. Falls under HTS 8404.90.00.00 as parts of auxiliary plant like soot removers for 8402/8403 boilers. Critical for preventing efficiency loss in fossil fuel plants.
Condenser Tube Sheet
Thick forged plate with precision-drilled holes to hold condenser tubes in steam power units, facilitating heat exchange for vapor condensation. Classified under HTS 8404.90.00.00 as parts of condensers for vapor power units. Used in nuclear and fossil power plants for efficiency.
Gas Recoverer Baffle Assembly
Perforated steel baffles directing flue gas flow through heat recovery surfaces in boiler auxiliary systems, maximizing energy extraction. Under HTS 8404.90.00.00 as parts of gas recoverers for 8402/8403 boilers. Improves waste heat utilization in industrial plants.
Steam Condenser Shell Section
Cylindrical pressure vessel section housing tube bundles in surface condensers for steam power units, designed to withstand vacuum conditions. HTS 8404.90.00.00 covers it as parts of condensers. Vital for Rankine cycle efficiency.
Boiler Soot Remover Motor Drive
Electric gearmotor unit powering retractable soot blowers in auxiliary boiler cleaning systems. Classified as parts under HTS 8404.90.00.00 for soot removers used with 8402/8403 boilers. Ensures automated maintenance in continuous operation plants.
Superheater Header Manifold
Forged steel manifold distributing superheated steam through parallel circuits in boiler superheaters, equalizing flow and pressure. HTS 8404.90.00.00 as auxiliary plant parts for boilers. High-pressure design for power generation.
Economizer Support Bracket Set
Heavy-duty fabricated steel brackets and hangers mounting economizer modules within boiler casings, handling thermal expansion. Parts of auxiliary plant under HTS 8404.90.00.00 for 8402/8403 use. Ensures structural integrity under high temperatures.
Condenser Waterbox End Cover
Flanged steel cover sealing condenser waterbox ends, providing access for tube maintenance in steam power condensers. Classified as condenser parts under HTS 8404.90.00.00. Corrosion-resistant coating for cooling water exposure.
Soot Remover Control Valve
High-pressure steam control valve regulating flow to soot blower lances in boiler cleaning systems. HTS 8404.90.00.00 as parts of soot removers for boilers. Automated sequencing prevents tube erosion.
Boiler Draft Fan Impeller
Precision-balanced rotor blades for forced draft or induced draft fans supporting combustion air/flue gas movement in boiler auxiliary systems. While fan assemblies may classify elsewhere, impellers as replacement parts fall under HTS 8404.90.00.00. Critical for airflow optimization.
Heat Recovery Damper Assembly
Adjustable blade damper controlling flue gas bypass around economizer sections in boiler heat recovery systems. Parts under HTS 8404.90.00.00 for gas recoverers. Enables temperature control for optimal recovery.