Spiral Welded Steel Pipe for Water Transmission

Designed for heavy-duty water conservancy and municipal projects, Shunchen Spiral Welded Steel Pipe for water transmission combines high load-bearing capacity with cost efficiency. Utilizing advanced double-sided submerged arc welding (DSAW), our pipes deliver superior resistance to pressure and water hammer. Custom lengths up to 18m significantly reduce on-site welding for faster, reliable pipeline laying.

Core Technical Advantages

Uniform Stress Distribution & Water Hammer Resistance

The Spiral Welded Steel Pipe for water transmission seam distributes hoop stress evenly along the pipe circumference. Manufactured with high-grade carbon and low-alloy steel substrates (such as Q235B, Q345B, and API 5L Gr. B to X80), our pipes deliver strong structural rigidity to absorb operational pressure fluctuations and water hammer impacts, while withstanding soil load and minor geological settlements.

Large Bore Capacity & Long Segment Installation

With custom outer diameters up to 3620 mm and single pipe lengths up to 18 meters, SSAW pipes allow high-volume flow capacity. Delivering long pipe segments drastically reduces the total number of girth welds needed on-site, accelerating pipeline laying and minimizing potential leak points.

Terrain Adaptability & Cost-Effectiveness

The cold-extrusion manufacturing process provides steel pipes with optimum toughness for bending around complex topography like mountains, riverbeds, and coastal regions. Compared to seamless or longitudinal welded (LSAW) pipes of equivalent diameter, SSAW pipes reduce project capital expenditure by 20% to 30% without sacrificing pressure integrity.

Technical Specifications

Strict Quality Assurance & Testing Protocols

To guarantee leak-free operation over a 30+ year service life, every Spiral Welded Steel Pipe for water transmission undergoes rigorous full-process quality control from raw material receipt to final product dispatch:

100% Hydrostatic Pressure Testing

Every individual pipe is tested under specified water pressure to ensure structural integrity and zero seepage at the weld seams.

Dual Non-Destructive Testing (UT & RT)

Continuous online ultrasonic inspection combined with X-ray radiographic testing guarantees 100% internal weld seam density and defect detection.

Coating Inspection & Adhesion Testing

External 3PE/FBE coatings undergo high-voltage spark holiday detection for pinholes, along with cross-cut pull-off adhesion testing.

Traceability & Certification

Full product traceability with Mill Test Certificates (MTC) conforming to EN 10204 3.1, raw material heat numbers, and third-party inspection reports (SGS, BV, TUV).

Primary Application Fields

Municipal Water Mains: Large-diameter urban raw water supply networks and clean drinking water distribution lines.

Long-Distance Water Diversion: Regional cross-basin water transfer projects across mountain and desert terrains.

Industrial Water Systems: High-volume cooling water pipelines for power stations, chemical plants, and refineries.

Agricultural Drainage & Irrigation: Main trunk piping for flood control, reservoir discharge, and agricultural irrigation networks.

Coastal & Island Pipelines: Seawater intake lines and submarine/coastal buried fresh water supply systems.

Featured Project Case: Cross-Basin Trunk Water Line

Project Demand: Supply over 120 km of main water pipeline for a major municipal diversion project requiring high flow capacity (DN2000), resistance to soil settlement, and zero drinking water contamination.

Product Solution: Supplied Q345B SSAW steel pipes (OD 2020 mm, WT 18 mm) featuring internal non-toxic IPN8710 lining and external 3PE coating. Delivered in customized 18-meter fixed lengths to reduce joint count. 100% NDT inspection resulted in a 100% first-pass qualification rate during pressure commissioning.

Packaging, Shipping & Logistics Standards

Spiral Welded Steel Pipe for water transmission is fitted with protective plastic end caps to prevent internal contamination. Rubber buffer pads, wooden cradles, and heavy-duty slings are utilized during truck and marine vessel loading to prevent anti-corrosion layer scraping during transit.

FAQ

Q: Why choose SSAW spiral welded steel pipes instead of seamless pipes for water transmission? 

A: For large-diameter water transmission (DN700 and above), Spiral Welded Steel Pipe for water transmission offers significant cost advantages, reducing total material expenditure by 20% to 30% compared to seamless steel pipes. Additionally, SSAW pipes allow for continuous production with customizable outer diameters (up to 3620 mm) and lengths (up to 18 m), reducing the number of field weld joints and improving installation efficiency.

Q: How does internal coating ensure that drinking water remains safe and non-toxic? 

A: We apply food-grade internal linings such as non-toxic IPN8710, liquid epoxy coatings (AWWA C210), or cement mortar linings (AWWA C205). These coatings form an inert physical barrier between the steel substrate and water, preventing internal pipe corrosion, scaling, and heavy metal leaching, ensuring full compliance with potable water safety standards.

Q: What customized lengths can be supplied to optimize site installation? 

A: Standard lengths are 6 m, 9 m, 12 m, and 18 m. We also provide customized fixed-length pipes up to 18 meters according to specific project engineering designs. Longer pipe segments minimize the frequency of field welding joints, lowering labor costs and reducing potential leakage risk during long-distance transmission.

Q: What non-destructive testing (NDT) reports are provided prior to shipment? 

A: Every pipe undergoes 100% hydrostatic testing, full-length ultrasonic testing (UT), and X-ray radiographic testing (RT) on weld seams. For anti-corrosion coatings, spark holiday detection and pull-off adhesion tests are performed. Complete Mill Test Certificates (MTC) according to EN 10204 3.1 are supplied with each delivery.