Sourcing steel oxygen cylinders from China

Steel oxygen cylinder duty and classification

Read from the UK Trade Tariff on 25 October 2026, heading 7311 covers iron or steel containers for compressed or liquefied gas. Steel oxygen cylinders are classified by construction, pressure and water capacity. The selected lines carry 2% duty for goods from China, with no anti-dumping or countervailing duty recorded and no steel measure.

The listed suspension reduces duty to 0% only for empty portable medical oxygen cylinders of steel or steel alloy fitted with a valve and a pressure and flow regulator. An ordinary industrial cylinder does not meet that description. The tariff also attaches an import control of fluorinated greenhouse gases; the importer should confirm the applicable requirement and declaration evidence with their customs broker.

Confirm the commodity code using the cylinder drawing, material, construction, pressure, capacity and supplied fittings. Use the wider gas cylinder guide for other gas services and container types.

Specify oxygen service and the valve assembly

State industrial or medical oxygen service, whether cylinders arrive empty, working and test pressure, water capacity, steel grade, heat treatment, neck thread and valve outlet. Agree the regulator arrangement, shoulder stamping, internal cleanliness and protective caps. Ask the intended filling station to review the proposed cylinder and valve documents before ordering.

Cylinders used to transport oxygen need conformity assessment and marking. For a direct China-to-Great-Britain supply of new transportable pressure equipment, specify Rho marking and assessment through a Great Britain-appointed body. If the valve forms part of a medical device, the applicable medical device marking requirements also apply. Ask for documents covering the exact cylinder and valve combination.

Worked duty example

Illustrative example, not a quote: Illustrative order: 50 empty industrial steel oxygen cylinders, each of 50 litres under 7311 00 13 80, invoiced at £8,000 free on board, with £2,000 of freight and insurance to the UK. The customs value is £10,000. Duty at 2% is £200. Import VAT at 20% is charged on the customs value plus duty, £10,200, so it is £2,040. Import taxes total £2,240; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £200 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Certificates: match the cylinder design, supplied valve, batch records and inspection body's certificate to the order; check hydraulic test records against the agreed design standard.

Stamping and threads: read serial numbers, test pressure, water capacity, tare and manufacturing date; gauge the neck thread and compare the valve outlet with the approved sample.

Oxygen cleanliness: check sampled interiors for moisture, scale and contamination; request cleaning records and oxygen-compatibility evidence for seals and valve components. Oil and grease can react explosively with high-pressure oxygen.

Arrival condition: check valve guards, caps, dents, corrosion, paint and labels before releasing the shipment to the filling station. Agree the sampling and document checks through the inspection guide.

What goes wrong

A cylinder can match the drawing yet arrive with documents for a different valve or design. Unreadable stamping, mismatched threads and moisture or scale inside the cylinder can prevent acceptance by the intended filling station. Compare the production batch with the approved specification before loading.

For oxygen service, a substitute seal or contaminated valve is a safety issue. HSE warns against substituting components without proven oxygen compatibility. Agree cleaning, component approval and packing checks before production, and investigate contamination before filling.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.