Chapter 8404 — Customs Tariff Headings

Boiler Air Preheater

> A rotary or tubular device that preheats combustion air using heat recovered from boiler flue gas, reducing fuel consumption. It is designed for direct integration with boilers of heading 84.02 or 84.03 and qualifies as auxiliary plant under tariff item 8404.10.00.

Boiler Draft Fan Silencer

An acoustic silencer designed for induced draft fans in boiler systems, reducing noise while maintaining required draft pressure differentials. This silencer is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers of heading 84.02 or 84.03.

Boiler Economizer

> A heat recovery device installed in the flue gas path of steam boilers (headings 84.02 or 84.03) to preheat feedwater using residual heat from exhaust gases. It improves overall boiler efficiency and is explicitly covered as auxiliary plant under tariff item 8404.10.00.

Boiler Economizer Bypass Damper

A heavy-duty damper system that controls flue gas flow around economizers for temperature regulation, critical for safe operation during startup and load changes. This bypass damper is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Boiler Feedwater Preheater

A shell-and-tube preheater that uses extracted steam to raise feedwater temperature before it enters the boiler, reducing thermal shock and improving cycle efficiency. This feedwater preheater is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

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. It is designed for use with boilers of heading 84.02 or 84.03 and qualifies as auxiliary plant under tariff item 8404.10.00.

Cast Iron Boiler Economizer

> A cast iron economizer designed to recover waste heat from boiler flue gases to preheat feedwater, improving overall boiler efficiency. It is classified under tariff item 8404.10.00 as auxiliary plant specifically for use with boilers of heading 84.02 or 84.03.

Condenser Air Removal Package

A vacuum pump and ejector system for removing non-condensable gases from steam condensers in power plants, maintaining condenser vacuum for optimal turbine performance. This air removal package is auxiliary plant for steam or other vapour power units. It is classified under tariff item 8404.10.00 as auxiliary plant for condensers.

Condenser Hotwell Pump Skid

A pre-assembled skid with pumps that transfer condensate from the condenser hotwell to the feedwater system, including level controls specific to power plant condensers. This pump skid is auxiliary plant for steam condensers. It is classified under tariff item 8404.10.00 as auxiliary plant for condensers of steam or other vapour power units.

Condenser Tube Cleaning System

An automated bullet or sponge ball circulation system that maintains condenser tube cleanliness, preventing efficiency loss from fouling. This tube cleaning system is auxiliary plant for steam power condensers. It is classified under tariff item 8404.10.00 as auxiliary plant for condensers of steam or other vapour power units.

Condensing Economizer Unit

> An advanced condensing economizer that recovers both sensible and latent heat from boiler exhaust, achieving high efficiency. It is designed exclusively as auxiliary plant for industrial boilers of heading 84.02 or 84.03 and falls under tariff item 8404.10.00.

Deaerator for Boiler Feedwater

> A vessel that removes dissolved oxygen from boiler feedwater to prevent corrosion, using steam scrubbing. It functions as auxiliary plant under tariff item 8404.10.00 when integrated with boilers of heading 84.02 or 84.03, and is typically tray or spray-type.

Deaerator Spray Valve Assembly

A specialized valve tray assembly for steam deaerators that removes dissolved oxygen from boiler feedwater, critical for corrosion prevention in steam cycles. This deaerator spray valve assembly is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Economizer Heat Exchanger Module

A heat recovery device installed in boiler flues to preheat feedwater using waste flue gases, enhancing boiler efficiency. This economizer heat exchanger module is auxiliary plant for boilers of heading 84.02 or 84.03. It is classified under tariff item 8404.10.00.

Fire Tube Economizer Module

> A modular fire tube economizer with multiple passes for maximum heat transfer from flue gases to boiler feedwater. It is specifically engineered as auxiliary equipment for water tube boilers under headings 84.02 or 84.03, qualifying under tariff item 8404.10.00.

Flue Gas Heat Recovery Unit

> An auxiliary system that captures waste heat from boiler exhaust gases to preheat combustion air or generate hot water. It qualifies under tariff item 8404.10.00 as a gas recoverer for boilers of heading 84.02 or 84.03, with a modular design for easy integration.

Gas-to-Gas Boiler Economizer

An air preheater that recovers flue gas heat to preheat combustion air for boilers, typically rotary regenerative or tubular recuperative design for gas-fired units. This gas-to-gas boiler economizer is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

High-Pressure Economizer Assembly

> A heavy wall economizer assembly for high-pressure steam boilers exceeding 1000 psi operation. It is engineered specifically as auxiliary plant for power boilers of heading 84.02 or 84.03, featuring thick-walled tubes and reinforced headers, and falls under tariff item 8404.10.00.

Industrial Superheater Coil Assembly

A tubular coil assembly that superheats steam beyond saturation temperature in boiler systems, improving steam quality for turbine efficiency. This industrial superheater coil assembly is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Industrial Waste Heat Economizer

> A heavy-duty economizer for recovering waste heat from large industrial boilers, featuring bare tube and finned sections. It is classified under tariff item 8404.10.00 as essential auxiliary plant for boilers in power generation and industrial applications of heading 84.02 or 84.03.

Modular Economizer Bank

> A pre-assembled modular economizer bank with multiple tube circuits for scalable boiler applications. It is specifically designed as auxiliary plant for industrial boilers of heading 84.02 or 84.03, factory leak-tested with interconnection piping, and falls under tariff item 8404.10.00.

Packaged Boiler Economizer Kit

> A complete factory-assembled economizer kit including tubes, headers, casing, and mounting hardware for field installation on boilers. It is classified under tariff item 8404.10.00 as auxiliary plant despite kit packaging, due to exclusive design for boilers of heading 84.02 or 84.03.

Retractable Soot Blower Lance

> An extendable lance system that delivers cleaning media to boiler tube banks, retracting to avoid interference during operation. It is covered under tariff item 8404.10.00 as a soot remover auxiliary for boilers of heading 84.02 or 84.03, and is wall-mounted with automatic controls.

Retrofitted Economizer Insert

A compact economizer insert designed to be retrofitted into existing boiler stacks, recovering waste heat from flue gases to improve overall boiler efficiency. It includes a suspension frame and expansion joints for integration. Classified under tariff item 8404.10.00 as auxiliary plant for use with boilers of heading 84.02 or 84.03.

Soot Blower for Boilers

> An automated device using steam, air, or water jets to remove soot and ash deposits from boiler tubes and heat transfer surfaces, maintaining efficiency. It falls under tariff item 8404.10.00 as a soot remover, explicitly listed as auxiliary plant for boilers of heading 84.02 or 84.03.

Soot Blower System for Boilers

An automated mechanical or steam lance system that removes soot deposits from boiler tubes to maintain heat transfer efficiency, essential for reducing downtime in coal-fired boilers. This soot blower system is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Stainless Steel Economizer Coils

Corrosion-resistant stainless steel helical coils specifically designed for economizer service in biomass boilers, recovering heat from flue gas. These coils are engineered for the demanding conditions of biomass combustion. They are classified under tariff item 8404.10.00 as auxiliary plant for boilers.

Steam Desuperheater Injector

A water spray injector that reduces superheated steam temperature in boiler outlet headers, providing attenuation control for process steam requirements. This steam desuperheater injector is auxiliary plant for boilers. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Steam Power Unit Condenser

> A shell-and-tube heat exchanger that condenses exhaust steam from turbines back to water in vapor power cycles, enabling reuse in boilers. It is covered by tariff item 8404.10.00 as a condenser for steam power units associated with boilers of heading 84.02 or 84.03.

Steam Surface Condenser Tube Bundle

A steam surface condenser tube bundle is a removable assembly of finned tubes designed for heat exchange in surface condensers of steam power units. It facilitates efficient steam condensation by transferring heat from exhaust steam to cooling water, thereby maintaining turbine vacuum and improving overall power plant efficiency. This product qualifies under tariff item 8404.10.00 as auxiliary plant for use with boilers of heading 84.02 or 84.03, specifically as a component of condensers for steam power units.

Steel Tube Boiler Economizer

A finned steel tube economizer that captures residual heat from combustion gases to preheat boiler water, thereby reducing fuel consumption. This dedicated economizer is designed for steam boiler systems. It is classified under tariff item 8404.10.00 as auxiliary plant for use with boilers.

Barometric Surface Condenser for Utility Boilers

A vertical shell-and-tube condenser with an extended tailpipe for gravity removal of condensate, designed for use in large utility boiler steam cycles. It condenses exhaust steam from turbines into water, playing a critical role in the efficiency of steam power generation. This product is classified under tariff item 8404.20.00 as a condenser for steam or other vapour power units.

Jet Condenser for Small Steam Power Units

A direct-contact condenser that mixes exhaust steam directly with cooling water to condense it, commonly used in smaller steam power plants or industrial cogeneration systems. This design is efficient for applications where cooling water is abundant and steam purity is not critical. It is classified under tariff item 8404.20.00 as a condenser for steam or other vapour power units.

Stainless Steel Shell-and-Tube Condenser for Cogeneration Plant

A duplex stainless steel condenser designed for combined heat and power (CHP) cogeneration systems, condensing steam for district heating return. This product is built to withstand corrosive environments and is essential for recovering heat from steam cycles. It falls under tariff item 8404.20.00 as a condenser for steam power units in cogeneration applications.

Surface Condenser for Steam Turbine Power Plant

A large shell-and-tube heat exchanger designed to condense exhaust steam from a steam turbine in a power generation facility by cooling it with circulating water. This condenser is critical for maintaining vacuum conditions and improving turbine efficiency. It is classified under tariff item 8404.20.00 as a condenser for steam power units.

Titanium Tube Bundle Condenser for Marine Steam Propulsion

A corrosion-resistant condenser with titanium tubes for naval or marine steam turbine propulsion systems, handling seawater cooling. This product is designed for harsh marine environments and ensures reliable condensation of steam in shipboard power systems. It falls under tariff item 8404.20.00 as a condenser for steam power units in marine applications.

Vacuum Condenser System for Biomass Power Plant

A complete condenser package including surface condenser, vacuum pumps, and ejectors for biomass-fueled steam power plants. This system is designed to condense steam from biomass boilers and maintain vacuum conditions for efficient power generation. It is classified under tariff item 8404.20.00 as a condenser for steam power units auxiliary to biomass boilers.

Boiler Draft Fan Impeller

A precision-balanced rotor assembly for forced draft or induced draft fans used in boiler auxiliary systems. This impeller is a replacement part for fans that support combustion air and flue gas movement, which are integral to the operation of auxiliary plant for boilers of heading 84.02 or 84.03.

Boiler Soot Remover Motor Drive

An electric gearmotor unit that powers retractable soot blowers in boiler auxiliary cleaning systems. This motor drive is a part of soot removers used with boilers of heading 84.02 or 84.03, ensuring automated maintenance of heat transfer surfaces.

Condenser Tube Sheet

A thick forged plate with precision-drilled holes designed to hold condenser tubes in steam power units. This tube sheet is a critical part of condensers for steam or other vapour power units, facilitating heat exchange for vapour condensation.

Condenser Waterbox End Cover

A flanged steel cover that seals the ends of condenser waterboxes, providing access for tube maintenance in steam power condensers. This end cover is a part of condensers for steam or other vapour power units, with corrosion-resistant coating for cooling water exposure.

Economizer Support Bracket Set

Heavy-duty fabricated steel brackets and hangers used to mount economizer modules within boiler casings, designed to handle thermal expansion. These supports are parts of auxiliary plant for boilers of heading 84.02 or 84.03, ensuring structural integrity.

Economizer Tube Bundle

A heat exchanger assembly of finned tubes designed to recover waste heat from flue gases in boiler systems, preheating feedwater to improve efficiency. This tube bundle is a part of auxiliary plant for boilers of heading 84.02 or 84.03.

Gas Recoverer Baffle Assembly

Perforated steel baffles that direct flue gas flow through heat recovery surfaces in boiler auxiliary systems, maximizing energy extraction. These baffles are parts of gas recoverers for boilers of heading 84.02 or 84.03.

Heat Recovery Damper Assembly

An adjustable blade damper that controls flue gas bypass around economizer sections in boiler heat recovery systems. This damper assembly is a part of gas recoverers for boilers of heading 84.02 or 84.03, enabling temperature control for optimal recovery.

Soot Blower Element

A retractable lance or rotary assembly with nozzles that inject steam or air to dislodge soot from boiler tubes, maintaining heat transfer efficiency. This element is a part of soot removers, which are auxiliary plant for boilers of heading 84.02 or 84.03.

Soot Remover Control Valve

A high-pressure steam control valve that regulates flow to soot blower lances in boiler cleaning systems. This valve is a part of soot removers for boilers of heading 84.02 or 84.03, enabling automated sequencing to prevent tube erosion.

Steam Condenser Shell Section

A cylindrical pressure vessel section that houses tube bundles in surface condensers for steam power units, designed to withstand vacuum conditions. This shell section is a part of condensers for steam or other vapour power units, vital for Rankine cycle efficiency.

Superheater Coil Assembly

Coiled high-temperature alloy tubes that superheat saturated steam from boilers to increase energy content and efficiency in power generation. This coil assembly is a part of auxiliary plant for boilers of heading 84.02 or 84.03.