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What is a spiral tube?

Spiral seam pipe Or Spiral tube It is a type of thick steel pipe that is produced by hot rolling in spiral form. In the process of making these pipes, metal sheets with different thicknesses pass through rollers and become a pipe, and their connection points are connected to each other by sub-powder welding, which is much cheaper than the seam method. It is produced directly with different diameters with the use of water, piles, as well as oil, gas and petrochemical industries.

The method of making a spiral tube

These pipes are produced and marketed in two ways, one-stage and two-stage.

One-step method:

  • Preparation of sheets
  • Forming the sheet
  • Sub-powder welding of internal and external seams

Two-step method:

  • Preparation of sheets
  • Forming the sheet
  • Using GMAW welding to weld seams
  • Internal and external powder welding
In this method, immediately after forming the pipe, temporary welding is applied using protective gas on the pipe seam and the final welding is done simultaneously on the inside and outside seams by sub-powder welding stations, which is one of the advantages of this method. It is possible to mention more production efficiency and much higher quality than the first method. The design and construction of the production line of this company is based on the modern method of two-stage welding known as offline. In the two-step method, after the pipes are produced, their internal and external surfaces can be coated with materials such as bitumen, liquid epoxy, and polyethylene to increase corrosion resistance.

Forming methods of spiral seamed pipe

In order for you to be fully familiar with all the manufacturing methods and how to form all kinds of steel pipes, you can see the table below.
How to formDescription
O and UThe metal plates are bent like the letter U and then bent like the letter O.
2CTwo sheets with the same thickness are curved like the letter C and then welded together.
C and OThis method is exactly like the C and U method, although the difference is that more bending is done on the sheet in the initial stages.
spiralThe metal sheet is shaped into a tube like the groove inside the bolt and nut, and then the seam between the sheets is welded.
Roller bending or pyramid rollingThe metal sheet is curved between several rollers and then its seam is welded.

Advantages of spiral tube

  • High malleability
  • Stronger and more powerful
  • It can be produced in different materials for different applications
  • Easier airflow measurement
  • Low production cost
  • Less air leakage and easier purification
  • Shorter production and delivery time
  • Ease of installation
  • No restrictions on the length of pipes
  • Very high resistance to breakage and cracking
  • High pressure resistance

Spiral tube applications

Spiral pipes are used for oil, gas and water industries. These pipes can be used in urban water and sewage transfer, pressurized irrigation, urban gas supply, coating layer, bridge and metal structures, etc.

Among other applications of spiral pipe, we can mention the heating system and ventilation system of large buildings such as hospitals, warehouses, public centers, etc.

Technical specifications of the spiral tube

Spiral seamed pipes follow different standards according to their application.

For example: the pipes used to transport water follow the AWWA-C200 standard.

The production line of this company has the ability to produce spiral seam pipe up to a diameter of 100 inches (2540 mm) with a maximum thickness of 1 inch (25.4 mm) with steel grade up to API-X80.

The price of spiral pipe

The price of spiral pipes varies according to the quality and thickness of the sheet used, the type of welding, and according to the use and type of consumption, so please contact our experts for information on the price and free consultation.

Why should you cooperate with us?

  • More than 30 years of experience
  • Nominal capacity of 250 thousand tons
  • Using the best steel alloy with API-X80 grade
  • Continuous expansion and presence in domestic and foreign markets
  • Product quality test statistics at the highest possible level

Frequently Asked Questions

Some of these pipes do not have the approved technical standards and conditions, however, they can be repaired, but some of them do not have sufficient conditions for use even after repair.

According to the application, alloy standards, etc., one should choose one of these two samples after checking the conditions of use, pressure tolerance, and temperature.

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