Spiral pipe

Iron spiral is one of the well-known and widely used products in various industries. The main reason for the use of this product in various industrial use should be examined in its many benefits. This type of iron pipe has a special production process and technical visits that give it distinctive features. But why this type of pipe called spiral? How is the price of this product in today’s market? Spiral pipes are produced in two types, test and industrial.

Products introduction  

What type pipe is an iron spiral pipe?

Spiral in the pipe industry is one of the methods of sheet pipe production. Actually, a spiral pipe is a pipe that is produced in a spiral from during a special process.                                                                       The iron sheet usually rolled with low- carbon or low-alloy steel coils and with a certain spiral angle, and then the pipe seam is welded from above and below. They produce and supply spiral iron pipe with different thicknesses and sizes (usually from 5 to 120) inches.                     The specifications of this product are usually expressed by the outer diameter and wall thickness. In this article, we want to review the productions process, market price, standards and advantages of the spiral pipe.

How do they produce spiral iron pipe?

In the spiral method, spiral steel pipes are made with coil of different thicknesses. In this method, the steel sheet according to the dimensions and diameter of the pipe opening is rolled from the opening of the spiral rolling machine and finally, it is welded by two electrodes.            With the help of the spiral production process, we can produce iron pipes of different diameters at a lower cost than pipes with straight seams. this production method is definitely effective on the price of iron spiral pipe. The production method of these pipes completely different from the production method of seamless pipes such as manisman pipes, gas or galvanizeh pipe.                                                                                   In the following, we refer to the steps of this work.

• Inserting the coil into the production line and connecting it to the holder and straightener.
• The cutting and end of the sheet, which includes cutting and preparing the end of the production the end of the production coil of iron spiral pipe, starting a new coil and welding its edges to each other.
• Smoothing the beginning and end of the spiral sheet with the help of flat rollers.
• Edge cutting and waste collection during which the edge of the sheet cut using rotating discus in the edge area.
• Holding and adjusting the iron spiral pipe sheet or strip in the center of the spiral line.
• Annualizing the edge of the sheet, correcting it and achieving production conditions according to the required angle on both sides’ coils.
• Tabularization of the sheet by passing through different adjustable rollers for different sizes.
• The internal and external welding stage during which, after the pipe is formed, the edges are welded by the submerged arc welding method (SAW: Submerged Arc Welding) this is done first for the inside and then the outside surface of the pipe.
• Ultrasonic test stage with the help of a device that can detect possible defects of the welding place and seam immediately after welding.as a result, at this stage, the defective iron spiral pipe is removed from the production line.
• The cutting stage is done using plasma cutting and usually to different lengths, desired by the customer. Therefore, the result of the work at this stage should also be considered effective on the process of the determining the price of the iron spiral pipe.
• Pipe numbering for the possibility of tracking the product and having access to the exact production history of each pipe, with this we can determine the exact production date and the number od screws in the form the following specifications:
• Thickness and grade of steel used.
• Pipe number.
• Year/week/ day of the production.
• Chamfering the two ends of the iron spiral pipe.
• Hydrostatic test which is done with the help of a device that tests all the spiral tubes produced with a maximum pressure of 5000 PSI and liquid injection. At this stage, the high pressure of the liquid inside the pipe indicates the occurrence of any problem in the weld or sheet in the form of water leakage.
• Controlling dimensions and welding appearance inspection in the sense that all pipes are checked by the quality control group of the factory. On the other hand, they also control the angle and diameter of the two ends of the pipes, and if no specific problem is detected, they insert a quality label (QC) on the products.

What are the most common techniques for producing spiral iron pipes?

 

Perhaps one of the factors affecting the price of iron spiral pipe can be attributed to the technical mechanisms of this product production. Different mechanisms for producing this type of pipe differ from each other in terms of the method of placing steel coils between the rollers.

Placement between several rollers creates the necessary curvature in iron plates. Then the final seam of the spiral steel pipe is welded. In the following, we mention some of these mechanisms.

• O&U: In this method, the steel strips used to make the iron spiral pipe are U-shaped and become O-shaped during the production process.
• C&O: This method is somewhat similar to the first production method; with the difference that during it, they apply more bending on the iron sheet. Generally, in the spiral forming method, the steel sheet is stretched around a threaded plate and finally, the iron spiral pipe is formed. Welding is used to fill and connect the edges of the sheet.
• C2: In this method, welding is applied between the two halves of the pipe. These half pipes are first made in C shape.

What is the type of welding in the production process of iron spiral pipe and what is its importance?

Maybe it’s not bad to get a little detailed about the details of its production before going to the price of the iron spiral pipe. To make spiral pipes, they usually use sub-powder welding method, which has certain principles.

In the process of this type of welding, they use the method of hiding the weld with powder coating or special flux. This work prevents the supply of oxygen to the welding place on both the inner and outer surfaces of the iron spiral tube. This welding method has a positive effect on the results of hydrotest tests and cold operation on the pipe.

The production process of iron spiral pipe usually includes which technical inspections?

In order to ensure the quality of each of the manufactured products, such as P.V.C pipe or manhole valve types, spiral pipe also usually monitor the work steps according to the inspection program and consistent technical and qualitative tests. The most important types of these processes are inspections:

• Raw material
• level
• The tensile strength of internal and external surface welding
• forming
• Pipe cutting
• Ultrasonic
• groove
• External dimensions
• wall thickness
• X-Ray
• hydrostatic
• cold bending
• Final inspection

Such a long and high list of product evaluation has a decisive role in the conditions of production and price determination of iron spiral pipe. In the following, we briefly discuss some of these processes.

• Inspections of raw materials: The most important raw materials required for the production of spiral pipe, coil or steel strip, welding wire and flux. Detailed physical and chemical tests on raw materials are necessary to ensure the quality of the final product.
• Welding Inspection: Continuous inspection is very important to identify welding defects, maintain weld quality and ensure its grade. This reduces the risk of hidden welding defects and quality problems.
• Ultrasonic testing: After welding, the welded joints are checked online continuously with an automatic ultrasonic fault diagnosis device. If a defect is detected, people are usually warned automatically with a sign in the form of a spray. Next, after fixing the problem, the parts with diagnostic signs are checked again with a handheld ultrasonic device and X-ray.
• Hydrostatic test: Every iron spiral pipe is subjected to a hydrostatic pressure test and its sealing condition is checked. The pressure and test time are also controlled by the steel pipe hydraulic microcomputer detection device. During this process, the test parameters are automatically recorded and maintained.

The price of iron spiral pipe is subject to what conditions?

Compliance with the technical and qualitative requirements of materials and technology for the production of iron spiral tubes, including hot-rolled coils, requires spending financial and non-financial costs. On the other hand, the quality level of production technology also determines the price of this product in the market.

These conditions make us expect the price of iron spiral pipe produced with hot rolled coils to be higher than similar products made with hot rolled sheet; Therefore, it is said that the price of iron spiral pipe in the market is higher than that of straight seam pipe.

In the following, we mention the most important factors affecting the price conditions of this product in the market.

• Materials and technology used for production: Producing a high-quality product largely depends on how to choose the materials that are going to form the spiral tube. Even when using the best raw materials, the level of technology used will determine the price, especially for processes such as welding and quality inspections.
• Iron spiral pipe production rate of return: In order for the rate of return of this product to be acceptable during its manufacturing conditions, the pricing of the final product is calculated by considering the contribution of each process in the production. With this description, the logic of determining the price of the iron spiral pipe may become more understandable and realistic.

What is the price of iron spiral pipe in the market?

In the table below, you can see the price of different types of this product. Of course, considering the current fluctuations in the price conditions of equipment and raw materials, it is better to refer to the suppliers of these products to access more detailed information.

Row	Producer	Size (inch)	Thickness (mm)	the length (meter)	Price per kilogram (Rial)
1	Spiral tube rolling pipe and reed cover	16,18,20,24,32,42,48	5,6,8	12	354,130
2	Kalup Spiral pipe	16,18,20,24,32	5,6,8	6,12	355,050
3	Isfahan spiral pipe	16,18,20,24,32	5,6,8	12	356,890

 

What are the advantages and uses of iron spiral pipe?

This product is mainly used in the oil and gas industry to carry out processes and transfer materials to transmission pipes.

The strength of these pipes in industrial and chemical applications is equal to direct welding seam pipes (ERW: Electric Resistance Welding); Therefore, they can be a good substitute for them.

Uniformity of dimensions, mobility, flexibility and optimal strength are among the advantages of this product. In the following, you can review more details about the benefits of its use.

• Shape benefits including:
• Having an attractive appearance that is often favored by architects and designers.
• You can use the paintable spiral duct in such a way that it blends in with the interior environment or stands out from it.
• The special features of the iron spiral pipe can reduce the difficulty and costs of its installation.
• Longer spiral pipe spans reduce the number of fittings and hangers required for installation.
• You can install the connections quickly and easily, and their sealing is also easier.
• Lower costs: You may not be able to correctly analyze the cost-effectiveness of the iron spiral pipe at first glance, but you should look for this economic advantage in the long-term capabilities of this product. The iron spiral pipe has lower initial and operating costs, which is mainly due to having the following capabilities:
• Less air leakage
• Optimum air flow
• Less pressure drops
• The strength of the spiral tube allows the use of lighter gauge and less expensive metals.
• The smooth interior of the spiral duct traps less dust and is easier to clean.
• Customized iron spiral pipe fittings for various uses: the standard components of this product are suitable for any application; Including: knees, tees, laterals, reducers, hoods, blast gates, cleaners, inlets, deviations, etc.
• Practical advantages of iron spiral pipe:
• The spiral seam makes this product divert fluid stress much better than straight seam pipes. This feature helps to resist pressure.
• Welded iron spiral pipes have better adjustability than similar products. You can order them in more diameters and lengths; without jeopardizing their integrity or structural strength.

Conclusion

The production of iron spiral pipe with its specialized and quality conditions and its many advantages may be considered as one of the important innovations of the industry. This product is now available in different sizes and dimensions in the market.

Spiral pipe is used for applications such as oil and gas systems, steam, water, liquid petroleum, construction of foundation piles and structures such as bridges and buildings.

Therefore, before checking the price of iron spiral pipe, it is better to determine the application conditions and technical specifications of the product you need correctly so that you can choose wisely.