Spiral Welded Steel Pipe

Spiral welded steel pipe is a modern pipe system produced by forming steel coil into a spiral shape and welding the edges together along a continuous helical line. Thanks to this manufacturing technique, spiral welded steel pipe offers high strength, long service life and excellent performance under both internal and external pressure. It is widely used in water transmission, wastewater, storm water, oil, gas, industrial lines and many other infrastructure projects where reliability and economic performance are equally important.

Because spiral welded steel pipe can be produced in large diameters and various wall thicknesses, engineers gain significant flexibility in pipeline design. Wide diameter options make it possible to carry high flow rates with fewer lines, while adjustable wall thickness allows the pipe to be optimized according to pressure class and project requirements. As a result, spiral welded steel pipe systems provide a strong, long-lasting and cost-effective solution for both public and private sector investments.

How Is Spiral Welded Steel Pipe Produced?

In the production of spiral welded steel pipe, certified steel coils are first checked according to chemical and mechanical standards. The coil is then uncoiled, leveled and cut to the appropriate strip width. During the forming stage, this strip is continuously formed into a cylindrical shape at a specific spiral angle and fed into the welding station. Here, automatic submerged arc welding processes are applied from inside and outside, creating a continuous and homogeneous weld seam along the entire body of the pipe.

Throughout production, dimensional controls, visual inspections and non-destructive tests such as ultrasonic testing are performed. If required by the project specification, each spiral welded steel pipe may also be subjected to hydrostatic pressure testing. These controls help to prevent potential defects such as cracks, porosity or misalignment in the weld seam. In the final stage, internal and external coating systems suitable for the service environment are applied to increase corrosion resistance and extend the service life of the pipeline.

Application Areas of Spiral Welded Steel Pipe

Modern infrastructure and industrial projects often prefer spiral welded steel pipe when they need a durable and long-lasting carrier system. Municipal drinking water transmission lines, raw water and irrigation projects, wastewater and storm water collectors, industrial process lines and energy transmission systems are among the main areas of use. In addition, spiral welded steel pipe is frequently selected for port, harbor and marine structures, especially where high structural strength and corrosion resistance are required.

Thanks to its wide diameter range, spiral welded steel pipe provides low friction losses and high hydraulic efficiency, especially in high-flow lines. This supports energy savings in pumping systems. In places such as river crossings, bridge underpasses or long-span transitions, the high mechanical strength of steel allows the system to operate safely even under difficult terrain and loading conditions. By selecting the appropriate steel grade and wall thickness, it is possible to design both safe and economically optimized pipelines.

• Long-distance water transmission and raw water lines for municipalities and utilities


• Wastewater and storm water collectors with high flow capacity


• Industrial process pipelines and factory infrastructure networks


• Oil, gas and energy transmission lines requiring high pressure resistance


• Irrigation and drainage systems in agricultural projects


• Port, harbor, jetty and coastal protection projects as carrier and structural elements

Advantages of Spiral Welded Steel Pipe

One of the most important advantages of spiral welded steel pipe systems is their ability to combine high strength and economic cost in the same solution. The spiral forming technique helps distribute stresses more evenly along the pipe wall, providing excellent performance under internal and external pressure, especially in large-diameter lines. This structure contributes to long service life and high operational safety. At the same time, the possibility of selecting different wall thicknesses and steel grades according to the project prevents unnecessary material usage and helps control investment costs.

Another advantage of spiral welded steel pipe is the controlled and traceable production environment. Since welding, dimensional controls and coating processes are carried out in a factory setting, quality is documented at every stage. This makes site installation faster and safer, and significantly reduces the risk of unexpected problems during operation. In addition, thanks to long pipe lengths, the number of field welds is reduced, which lowers labor and inspection costs in the field.

• High pressure resistance and structural safety in demanding operating conditions


• Wide diameter and length options for flexible and efficient pipeline design


• Optimized cost by choosing suitable steel grade and wall thickness for each project


• Continuous, reliable weld seam obtained by automatic welding systems


• Various internal and external coating options for superior corrosion protection

Coating and Protection Solutions for Spiral Welded Steel Pipe

One of the key factors that determines the service life of spiral welded steel pipe systems is corrosion resistance. For this reason, coating systems compatible with the operating medium and soil conditions are carefully selected. On the external surface, polyethylene (PE), polypropylene (PP), fusion bonded epoxy (FBE) and bitumen-based coatings are commonly used to protect the pipe against soil, moisture and mechanical impacts. These coatings create a strong barrier between the steel surface and the environment, reducing the risk of corrosion over the long term.

On the internal surface, different options can be used depending on the quality of the transported water or fluid and process conditions. For drinking water and raw water projects, cement mortar lining or epoxy-based coatings are preferred. For industrial fluids, special epoxy or polyurethane systems may be selected. With a correctly designed coating system, spiral welded steel pipe requires less maintenance during its service life, offers lower operating costs and ensures that the pipeline remains reliable for many years.

What Should Be Considered When Selecting Spiral Welded Steel Pipe?

When choosing spiral welded steel pipe for a project, several technical and environmental parameters must be evaluated together. Line pressure, type of fluid, temperature, soil conditions, route geometry, installation method and targeted service life directly affect the choice of diameter, wall thickness, steel grade and coating system. In addition, the quality certificates of the manufacturer, production standards, test reports and reference projects should be examined carefully before making a final decision.

A spiral welded steel pipe system designed with the support of a professional engineering team meets not only the initial investment budget, but also long-term operating and maintenance expectations. Accurate calculations, correct product selection and cooperation with an experienced manufacturer reduce the risk of failure, leakage and unplanned shutdowns during operation. In this way, investors, engineers and contractors can complete their projects safely, on time and within budget.

Your Reliable Partner for Spiral Welded Steel Pipe Solutions

Spiral welded steel pipe systems have become an indispensable part of today’s infrastructure and industrial investments. For projects that aim to build long-lasting, safe and economically optimized pipelines, choosing the right product and the right manufacturer is of critical importance. Production in accordance with international quality standards, strong engineering support, timely deliveries and long-term technical assistance are decisive factors in the success of a spiral welded steel pipe project.

Each spiral welded steel pipe produced with this approach becomes a reliable component of the pipeline system throughout its service life. In water, energy or industrial applications, a well-designed spiral welded steel pipe network protects the value of the investment, minimizes maintenance requirements and ensures that the system operates efficiently and safely for many years.