Үлкен диаметрлі спиральды құбыр

Shunchen’s large diameter spiral pipes are manufactured in strict accordance with domestic and international standards such as GB/T9711 and API 5L, with comprehensive quality inspection and technical support to ensure stable and reliable performance.

Over the years, Shunchen has earned the trust of numerous engineering clients through consistent product quality, flexible specification customization, and an efficient logistics system. Whether you are looking to procure large diameter spiral pipes, inquire about spiral welded pipe pricing, or find a reliable steel pipe supplier or engineering pipe manufacturer, Shunchen provides a one-stop service from product selection and custom production to delivery, helping your projects operate efficiently, safely, and reliably.

Product Definition

Large Diameter Spiral Pipe (also known as large-bore spiral welded pipe) is a type of spiral seam steel pipe made from high-quality hot-rolled strip steel sheets as the core raw material. It is formed by cold extrusion at room temperature and then welded using an automatic double-wire double-sided submerged arc welding process. The core definition standard is an outer diameter of ≥ 711mm (corresponding to a nominal diameter of DN700 and above). It can be customized to an outer diameter of up to 3620mm or even larger specifications according to engineering requirements. It is a composite type of steel product that combines load-bearing and conveying capabilities. Its core function is to achieve long-distance, high-stability transportation of large volumes of fluids (such as water, oil, gas, sewage, etc.), and can also serve as a structural support component for large-scale projects, adapting to complex working conditions and harsh environments. With its unique spiral structure design, it fills the industry gap in efficient production and stable application of large-bore pipe materials, and is widely used in various infrastructure and industrial scenarios.

In simple terms, large diameter spiral pipe is "the large artery for transportation in large-scale projects + the structural support framework" - it can efficiently transport various media, meet the demand for large flow transportation, and withstand high pressure, heavy load, and complex geological influences. It is suitable for various complex construction environments such as mountains, coasts, and deserts. It is the core basic pipe material connecting energy, water conservancy, municipal, and infrastructure.

Core selling points

The large-diameter spiral tube has outstanding core advantages, including safety, flexibility, economy, convenience, and compliance: its weld seams are evenly distributed along the spiral line, and the stress is evenly dispersed. It is paired with high-quality steel substrates such as Q235B and X80, as well as anti-corrosion treatments such as 3PE and FBE. It is capable of withstanding pressure and construction, has high safety, and can last for over 30 years. It is suitable for harsh working conditions such as high pressure, heavy load, and strong corrosion. The specifications are extensive, ranging from 711mm to 3620mm in outer diameter, 6mm to 60mm in wall thickness, and 6m to 18m in single pipe length, which can be flexibly customized. It can be tailored to specific materials and processes based on engineering media, pressure grades, and construction environments, with extremely strong adaptability. It adopts continuous production by rolling and automatic submerged arc welding technology, achieving high production efficiency. Compared to seamless steel pipes of the same diameter, the price is reduced by 20%-30%, and installation is convenient, significantly reducing the total project cost. The pipe material has excellent toughness, allowing for cold bending to adapt to complex terrains such as mountains and coasts. The standardized welding interfaces have good sealing performance, high construction efficiency, and low difficulty. The entire production process follows national and international standards such as GB/T9711 and API 5L. From raw materials to finished products, full process control is implemented, multiple tests ensure quality compliance, and complete qualification certificates and test reports can be provided, fully meeting the needs of various key projects.

Technical Specifications

The core follows the standards of GB/T9711-2017 "Pipeline Transportation Steel Pipes for the Petroleum and Natural Gas Industry", GB/T 3091-2015 "Welded Steel Pipes for Low-Pressure Fluid Transmission", API 5L, SY/T5037, etc. The regular specifications are as follows, and special specifications can be customized as needed:

1. Core size specifications

2. Material Specifications

3. Pressure rating

The pressure calculation follows the GB50251 standard and uses the Barlow formula: t=(P×D)/(2×S×E)t=(P×D)/(2×S×E)t=(P×D)/(2×S×E)

Among them:

P —— Design pressure

D —— Outer diameter of the pipe

S —— Yield strength of the material

E —— Welding coefficient (for spiral welded pipes, it is 0.9)

Application fields and cases

The large-diameter spiral tubes, with their advantages of durability, flexible specifications, and high cost-effectiveness, are widely applied in five core fields including energy transmission, water conservancy projects, municipal construction, infrastructure projects, and industrial production. They are suitable for various key projects and complex scenarios. The following is a detailed introduction of the fields and real cases, accompanied by scenario explanations:

Core application fields

1.Energy Transmission Field (Core Application Scenario)

Compatible Media: Crude oil, natural gas, refined oil, coalbed methane, steam, etc. The core requirement is high-pressure, long-distance, and leak-free transportation. It is suitable for complex terrains such as deserts, plateaus, and mountains. It can withstand extreme temperature differences and geological settlement effects. It is the "main artery" of energy transmission and is widely used in the construction of long-distance pipelines. It can effectively improve transportation efficiency, reduce energy loss, lower the overall project cost, extend service life, and reduce maintenance investment.Scene Description: On the construction site of a long-distance natural gas pipeline in the Gobi Desert, rows of large-diameter spiral pipes are neatly laid out, and workers are conducting welding and connection operations; On the pipeline laying site for oil from the oilfield, the surface of the pipe materials adopts high-end anti-corrosion technology, which is suitable for the complex corrosive environment of the oilfield, ensuring that the oil is transported without leakage.

2. The field of water conservancy engineering

Applicable scenarios: Large-scale water diversion projects, water transfer projects, flood control and drainage projects, main pipelines for farmland irrigation, water supply projects for drinking water, island water supply projects, etc. The core requirements are high flow capacity, corrosion resistance, and water pressure resistance. They can be adapted to complex environments such as riverbeds, salt-affected lands, etc. They can effectively resist water erosion and geological subsidence, ensuring the stable transmission of water resources and guaranteeing the safe operation of water conservancy projects. They play an important supporting role in key national water conservancy projects.Scene description: At the construction site of the Jinghai Water Diversion Project, large-diameter spiral pipes are used for main pipeline laying. The pipes pass through rivers or farmlands, and workers perform interface sealing treatment. At the island water supply project site, large-diameter spiral pipes with 3PE anti-corrosion technology are used to resist seawater erosion and achieve the interconnection of water resources between the island and the mainland.

Typical case

Case 1: A branch line project of the West-to-East Gas Transmission (in the energy transportation field)

Project requirements: A long-distance high-pressure natural gas pipeline needs to be laid, suitable for complex terrains such as deserts and mountains. The pipe material must have a pressure-bearing grade of ≥ 6.3 MPa, be resistant to geological subsidence and corrosion, and be able to be supplied in batches quickly to ensure the pipeline operates without leakage for a long time.

Product application: X80 steel grade large-diameter spiral pipe was selected, with an outer diameter of 1220mm and a wall thickness of 22mm. The 3PE anti-corrosion process + cathodic protection technology was adopted. A total of over 8,000 tons were supplied, covering a pipeline length of over 120 kilometers, meeting the requirements of high-pressure transportation, and the welds underwent dual non-destructive testing of ultrasonic and X-ray, with 100% qualification.Scene：

Case 2: A main pipeline project of the Jing-Huai water diversion project (in the field of water conservancy engineering)

Project requirements: A large-scale water diversion main pipeline is needed to achieve large-scale clear water transportation, suitable for river crossing and farmland laying scenarios. The pipe material must be non-toxic, corrosion-resistant, have a large diameter, with a nominal diameter of DN2000. Customized 18m standard-length pipe materials are required to reduce the number of interfaces and improve construction efficiency.

Product application: Select Q345B material for large-diameter spiral pipes, with an outer diameter of 2020mm and a wall thickness of 18mm. The IPN8710 drinking water grade anti-corrosion process is adopted to ensure no secondary pollution of drinking water. Customized 18m standard-length pipe materials are provided, totaling over 5,000 tons, for laying the main pipeline across rivers and in farmlands.Scene:

Packaging and Shipping

1. Packaging standards (suitable for large-diameter and heavy-weight characteristics, taking into account protection and convenience)

2. Delivery Specifications (Taking into account efficiency, safety and cost, and adapted to the transportation characteristics of large-diameter pipes)

（1）Mode of transportation

（2）Loading requirements

Before loading, check the integrity of the pipe packaging and the condition of the anti-corrosion coating. After confirming there are no damages, lift the pipes smoothly onto the transportation carrier. Use steel wire ropes and rubber pads for fixation. Avoid winding the steel wire ropes over the anti-corrosion coating (use rubber pads to isolate). This is to prevent damage to the anti-corrosion coating during lifting and transportation, and to avoid deformation of the pipes due to squeezing. Place the pipes neatly. Group pipes of the same specification together. Arrange them by length and thickness, and place them separately to avoid collision damage caused by mixed loading. Ensure the end plugs are securely sealed to prevent foreign objects from entering the pipes.

（3）Supply cycle and delivery

（4）Transportation Assurance and After-sales Service

During the transportation process, real-time tracking is carried out, and the transportation location and condition of the pipes are provided in real time to avoid transportation delays or pipe damage. In case of packaging damage, pipe scratches, deformation, etc. during transportation, we will promptly arrange for re-delivery or on-site repair to ensure that it does not affect the construction progress of the customers. For long-distance and complex road conditions transportation, sufficient cargo transportation insurance will be purchased to comprehensively protect the customer's rights and interests.

Handover and after-sales: After the handover is completed, professional pipe storage suggestions will be provided (such as avoiding long-term exposure to the sun and rain in the open air, anti-corrosion pipes avoiding scratches by sharp objects, raising the bottom for storage to prevent rust contact with the ground, etc.), and if there are any questions related to installation or testing later, technicians will be arranged to promptly connect and answer.

The advantages of choosing Shunchen

It has strong pressure resistance, with uniform stress distribution in the spiral weld seam, excellent resistance to deformation and settlement. It is suitable for high-pressure long-distance transportation and complex underground environments. The specifications are complete, and the pipe diameter and wall thickness can be customized as needed to meet the requirements of large-diameter projects. The welding quality is stable, using double-sided submerged arc welding, with dense welds and good sealing performance. The entire process is guaranteed by non-destructive testing to ensure quality. The production efficiency is high, the material is solid, and it has a higher cost-performance ratio compared to seamless pipes and straight seam pipes of the same diameter. It can be paired with various anti-corrosion treatments such as 3PE and epoxy, suitable for scenarios like oil and gas, municipal, and chemical industries, with a long service life. The service system is complete, from scheme design, production customization to logistics distribution, on-site technical support, it follows the entire process, and the after-sales response is timely, providing reliable guarantees for the stable operation of the project.

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