HS Code for Gas Cylinders and Pressure Vessels
The HS Code for gas cylinders and pressure vessels is 731100. The MFN duty rate for importing to the US is Free.
| HS Code (6-digit) | 731100 |
|---|---|
| US Duty Rate (MFN) | Free |
| EU Duty Rate (MFN) | 0% |
| Chapter | 73 |
| Heading | 7311 |
| Last Updated | 2026-05 |
Description
Containers for compressed or liquefied gas, of iron or steel
HS Code 731100 covers iron or steel containers for compressed or liquefied gas, with a US MFN duty rate of Free.
Frequently Asked Questions
What are the critical packaging and marking requirements for shipping steel gas cylinders under HTS 7311.00?
Steel gas cylinders must be securely closed with valve protection caps or collars, and they must be clearly marked as containing compressed gas with the proper shipping name and UN number on the package. They must be properly secured in an upright position in the transport container to prevent damage and movement during transit, as per IMDG Code and IATA Dangerous Goods Regulations.
What are the specific US Department of Transportation (DOT) marking and testing requirements for importing steel gas cylinders under HTS 731100 into the United States?
All imported steel gas cylinders must bear a permanent DOT specification marking (e.g., DOT-3AA) and be certified to have passed a hydrostatic pressure test. The cylinders must be accompanied by a test report from a DOT-approved independent inspection agency, verifying compliance with the relevant US Code of Federal Regulations (49 CFR Part 178). Failure to provide this certification will result in refused entry by US Customs and Border Protection.
How does the type of steel or iron construction affect the classification and duty rates for HTS 731100 gas cylinders?
The specific alloy, manufacturing method (e.g., seamless vs. welded), and heat treatment of the iron or steel directly influence classification and duty. For example, cylinders made of stainless steel or alloy steel may be subject to different duty rates or separate subheadings compared to those made of common carbon steel, based on their composition and resulting strength characteristics. Precise material specifications are crucial for correct classification under this heading.
Import Restrictions and Requirements for Gas Cylinders
Importing gas cylinders into the U.S. is heavily regulated by the Department of Transportation (DOT). All cylinders must be manufactured, tested, and marked to comply with DOT specifications (e.g., DOT-3AA, DOT-39). Importers must provide a Certificate of Conformance from the manufacturer and may need to use a specific HTSUS subheading like 7311.00.0060 for seamless steel cylinders. Prior notice to the DOT is often required, and shipments are subject to inspection by Customs and Border Protection (CBP) and the Pipeline and Hazardous Materials Safety Administration (PHMSA).
Common Classification Errors for Gas Cylinders
A frequent error is classifying unfilled, welded gas cylinders (e.g., for camping stoves) as finished articles of welded tube or pipe (7306.30 or 7306.90). The correct classification is under 7311.00, which specifically covers containers for compressed/liquefied gas. Conversely, non-refillable, disposable gas cartridges (like those for whipped cream dispensers) are generally excluded and often fall under 7613.00. Always verify if the vessel is designed for gas storage under pressure to ensure proper classification in Chapter 73.
Related HS Codes
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