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Home Industries Gas Cylinders

Gas Cylinder Part Marking 


GT SCHMIDT manufactures machines for marking DOT specifications which are marking or engraving that allows manufacturers to make deep, permanent marking in a variety of metals for identification and information. Our DOT engraving helps mark gas cylinders such as serial numbers, pressure indicators, TARE weight, manufacturing codes, tank shoulder identification, and recertification marks.

If you are a gas cylinder manufacturer, hydrostatic testing center, re-certification facility, or a refilling station, our marking machines can automatically engrave deep, clean and reliable specifications marks. Whether you are marking on small or large size gas cylinders, pipelines, tanks or other gas vessels, we have the marking machines to solve your certification needs.


GT SCHMIDT designs, manufactures, and integrates industrial marking machines for product identification and traceability applications. Our marking machine & engraving systems are available as standard in-stock models, or we can design a custom system to meet your specific part size and application requirements. For over 125 years we have built marking solutions for a wide range of industries including aerospace, automotive, defense, energy, infrastructure, & medical.

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Marking on Gas Cylinders


Gas Cylinder OEMs

Original equipment manufacturers (OEMs) of gas cylinders provide a wide variety of high and low pressure vessels for atmospheric, process, welding, specialty, and industrial gases. Every one of these gas containers must adhere to the safety and stability guidelines determined by Compressed Gas Association (CGA) and the Department of Transportation (DOT).

To ensure that these and other pertinent regulations are complied with, the CGA provides a series of standards with criteria that cylinder manufacturers, re-qualifiers, fillers, and operators must use to accept, reject, and condemn compressed gas cylinders for continued use.

  • DOT 3AL 3AA Specification Numbers
  • MFG Date & Location Codes
  • Cylinder TARE Weight
  • Neck Ring Identification & Serial Numbers
  • Service or Working Pressure Indicators
Gas Cylinder Industry Marking

Hydrostatic Testing & Recertification Centers

In order to meet DOT Pipeline and Hazardous Materials Safety Administration (PHMSA) specifications, gas cylinders must be tested every 3, 5, or 10 years by a DOT approved hydrostatic testing facility.

Hydrostatic testing is the most accurate way to test pressure vessels including pipelines, plumbing, and chemical cylinders for potential leaks. The hydro re-qualification testing process is critical for preventing outdated containers from rupturing due to loss of structural integrity.

  • DOT specs: 4B 260 and 4B 300
  • 10, 5, and 3 year Hydro-test Recertification
  • PHMSA and CGA Guidelines


Hydrostatic Testing Center

Filler Station

All gas cylinders are subject to rules and regulations set out by Federal and State governments. Filler stations must adhere to these rules when not only filling cylinders, but determining if cylinders are safe and legal to fill. The requirements include protection from rust and damage that may dent the cylinder.

Gas cylinders and tanks are subject to recertification (also known as re-qualification) 10 years from their date of manufacture and every five years after that. They are required to have readable markings identifying them for reuse.

  • Filler Station Location Numbers
  • Tank Capacity and Design Pressure
  • ASME Code Symbols
Gas Cylinder Filler Station


Our dot peen pin marking and roll marking machines offer several advantages such as increased quality control, time savings, and improved employee health and safety.

Pin marking allows you to mark through multiple layers of old paint.

Stingers can be guided around the curvature of the cylinder during the marking cycle. For smaller tanks, our benchtop column mounted Styliner® Mark3 and Mark4 can be equipped with a rotary chuck to turn the cylinder during the marking cycle.

Roll Markers are great for gas cylinder OEMs who want deep, clean, perfectly aligned aesthetic marks. They can be equipped with custom tooling to allow for a single line of information to be marked on the angled surfaces of cylinders in one cycle. Multiple line marking on angled surfaces will require part fixture adjustments and marking tool changes. These hydraulic machines can be custom designed to handle various size cylinders.

Roll marking machines can be implemented into a cylinder production line and can becustom designed to accept various sized cylinders, mark precise DOT information, and then reposition cylinders to continue down the production line.

Dot Peen Pin Marking on Gas Cylinders


  • Gas Cylinders
  • Pipe Lines
  • Tanks
  • Compressors
  • Autoclaves
  • Vacuum Chambers
  • Custom Designed Laboratory Vessels

need a custom solution?

Our in-house design and engineering department has a full range of services and support to ensure that your marking application is successful.


At GT SCHMIDT, we design, build, and implement marking solutions that help manufacturers leave a lasting mark on their products, their companies, and their industries.

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made in usa since 1895
125 years of experience
installation & follow-up support