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HSChapter 84
U.S. imports of producer gas, water gas, acetylene gas, and similar water-process gas generators (HS 840510) totaled $3.1M in April 2026, traded with 20 countries.
Importers of Producer Gas, Water Gas, Acetylene Gas, and Similar Water-Process Gas Generators paid $95K in duties in April 2026 — an effective duty rate of 3.4% on $2.8M in dutiable value, based on actual customs collections rather than the published tariff schedule. Producer Gas, Water Gas, Acetylene Gas, and Similar Water-Process Gas Generators imports of $3.1M in April 2026 ran 69% above the year-to-date monthly average of $1.8M.
Last updated: April 2026 dataProducer gas and water gas generators convert solid or liquid fuels into combustible gas streams through partial oxidation or steam reforming, while acetylene generators produce acetylene via the reaction of calcium carbide with water — all classified together under 8405100000. Italy and the United Kingdom are the leading US suppliers, reflecting European industrial gas equipment manufacturing strength. These generators serve metallurgical, chemical, and energy applications, and importers should confirm whether the specific generator type triggers any EPA or OSHA process-safety reporting obligations upon installation.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
No. HTS 8405100000 covers the generator apparatus itself — the equipment that produces acetylene by reacting calcium carbide with water. Pre-filled acetylene cylinders and compressed gas supply systems are classified elsewhere (typically under heading 2804 for the gas itself, or 7311 for the cylinders). Only the generating equipment falls under heading 8405.
Heading 8405 covers generators that produce combustible gas through water-based processes (steam-carbon or steam-iron reactions) at relatively modest scales, traditionally for industrial fuel gas supply. Large-scale industrial steam methane reformers used in hydrogen or ammonia production are generally classified under heading 8419 as industrial process equipment. The scale, design intent, and output gas composition are the key distinguishing factors; a binding ruling from CBP is advisable for borderline equipment.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8405100000 | PRODUCER GAS,WTR GAS,ACETYLENE GAS,WTR PRO GAS GEN | $3.1M | 3.41% | $95K |
PRODUCER GAS,WTR GAS,ACETYLENE GAS,WTR PRO GAS GEN
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8405100000 | PROD,WTR,ACETYL GAS,SIM WTR PROCESS GAS GENERATORS | $5.4M |
PROD,WTR,ACETYL GAS,SIM WTR PROCESS GAS GENERATORS
1.3K no
DIGITAL PROCESSING UNITS, N.E.S.O.I.
HS 847150
PARTS & ACCESSORIES FOR ADP MACHINES & UNITS
HS 847330
PORT DIGTL AUTOMATIC DATA PROCESS MACH NOT > 10 KG
HS 847130
AUTOMATIC DATA PROCESSING STORAGE UNITS, N.E.S.O.I
HS 847170
AUTOMATIC DATA PROCESSING UNITS, N.E.S.O.I.
HS 847180
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $1.9M | $2.2M | +$332K |
| Maryland | $25K | $1.0M | +$1.0M |
| Connecticut | $38K | $696K | +$658K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| JFK INTERNATIONAL AIRPORT, NY | $147K | $2.9M | +$2.8M |
| HOUSTON, TX | $1.9M | $211K | -$1.7M |
| NEW ORLEANS, LA | $6K | $530K | +$524K |