Stainless Steel Tubing and Instrumentation from Bryan Hose & Gasket

stainless steel tubing and instrumentation

By definition, seamless means “perfectly consistent,” but many people get confused by terms such as “seam-free” and “welded-and-drawn” when it comes to selecting tube. Seamless tubing, welded tubing and seam-free tubing all appear to be consistently free of seams, but a closer look reveals significant differences. Bryan Hose & Gasket will discuss the differences between these types of tubing.

Bryan Hose & Gasket Has Round Stainless Tube

Stainless Steel Round Tubing is generally used for structural purposes and applications that range from aesthetic to highly functional. Stainless tubing provides good corrosion resistance, weldability, machinability and can be easily cleaned and sterilized.

Seamless Tube vs. Welded Tube

Seamless tube is extruded and drawn from a billet while welded tube is produced from a strip that is roll formed and welded to produce a tube. Welded tube is generally less expensive than seamless tube and is readily available in long continuous lengths. Typically, welded tubes go through a debarring process that removes the welded tube a smoother, almost brushed finish look in most cases.

Tube vs. Pipe

Tubes are structural. They are measured by outside diameter (OD), and generally used for structural purposes. Conversely, pipes are passageways. Pipes are measured by the inside diameter (ID), and are generally used to transport gases or fluids.

Applications of Bryan Hose & Gasket’s Seamless Tubes

Specific extreme applications will determine the needs for seamless high pressure tubing and will discourage the use of welded tube because the designers can’t risk the chance for defect. Major seamless applications consists of control lines for subsea safety valves for the oil and gas industry, hydraulic controls for shipbuilding and fuel and hydraulic lines for aerospace, and heat trace bundles for chemical processing. Welded tubing may be specified for applications within the medical device, automotive and appliance industries. While seam-free tubing is utilized as a substitute for seamless tubing in some applications, the products are not always interchangeable. This type of corrosion resistant tubing is the preferred choice in high-pressure applications.

Quality of Seamless Tubes from Bryan Hose & Gasket

Quality is critical when selecting a type of tube. It is important to consider aspects such as the raw material used, production process and integrity of the mill. Raw material should be the highest quality. Bryan Hose & Gasket is a reputable tubing supplier that fully documents our certifications and exceed ISO 9001 requirements. Our systems extend to the manufacturing process and allow for quality checks throughout the production of our products.


There are numerous differences between seamless, welded and welded-and-drawn tubing: complexity of the manufacturing process, cost of the finished product, opportunity for defect and pressure rating. If you are still have questions or are looking to purchase seamless tubing, don’t hesitate to contact us here at Bryan Hose & Gasket with the link below!

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