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SITCSection 7
U.S. imports of parts for producer gas, water gas, and acetylene gas generators (SITC 74172) totaled $510K in April 2026, traded with 11 countries.
Importers of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators paid $18K in duties in April 2026 — an effective duty rate of 10% on $178K in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts for Producer Gas, Water Gas, and Acetylene Gas Generators imports of $510K in April 2026 ran 53% above the year-to-date monthly average of $333K.
Last updated: April 2026 dataReplacement and spare parts for producer gas, water gas, and acetylene gas generators — including purifier components, reaction vessel parts, and associated fittings — serve a narrow but technically demanding segment of the industrial gases and chemical processing industries. Because the parent equipment operates under pressure and with flammable or toxic gases, parts must meet stringent material and dimensional specifications, and importers should document the specific generator model and application in entry paperwork to support classification. The relatively low trade volume of this heading means classification disputes, while infrequent, can be consequential for specialized industrial importers.
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Purifiers that are integral to and specifically designed for producer or water gas generators generally classify as parts under this heading. Stand-alone industrial filtration or purification units that are not dedicated to gas generators may classify under separate SITC headings for filtering or purifying machinery. The design specificity and commercial documentation linking the purifier to the generator are the determining factors.
Importers should provide a commercial invoice that identifies the specific generator model, the part's function within the generator, and the material composition (particularly for pressure-bearing components). If the part is a pressure vessel component, documentation demonstrating compliance with applicable ASME or equivalent standards may be requested by customs or required for downstream installation approval.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $332K | $211K | -$121K |
| CHILE | -- | $177K | +$177K |
| ITALY | $95K | -- | -$95K |
| SINGAPORE | -- | $89K | +$89K |
| UNITED KINGDOM | $34K | $42K | +$8K |
Monthly import values over time