Spiral Welded Pipe -Wanrong Pipeline

I. Overview of Spiral Welded Pipes:

Spiral welded pipes are high-strength tubular materials manufactured through a spiral forming process that involves rolling and welding steel strips. Their core advantage lies in the ability to produce large-diameter pipes (with a maximum diameter of 3,000 mm) using narrower raw materials, while also achieving weld seam strength that generally exceeds that of straight seam welded pipes.

The production process employs double-sided submerged arc welding technology, combined with 14 stringent quality control procedures such as online ultrasonic testing and hydrostatic pressure testing, ensuring 100% non-destructive testing of weld seams and radial sealing integrity.

In terms of application scenarios, spiral welded pipes are widely used in oil and gas transportation, infrastructure pile foundations, municipal water supply systems, and emerging hydrogen energy pipeline sectors. Their excellent resistance to deformation and corrosion adaptability make them a preferred choice for critical infrastructure.

For procurement needs, the article provides a systematic guide: key considerations include material certification (e.g., Q235B/X70 steel), international standards (API 5L/GB/T9711), weld quality, and supplier qualifications (must hold ISO 3183 certification, etc.), while cautioning against low-price traps and differences in corrosion-resistant processes (e.g., 10kV spark testing requirements). The entire article is supported by technical parameters and engineering case studies, providing comprehensive decision-making references for pipeline selection.

II. Production Process Flow Chart for Spiral Welded Pipes

III. Application Areas of Spiral Welded Pipes

A. Oil and Natural Gas Transportation: Used for the transportation of crude oil, natural gas, and petroleum products, these pipes can withstand abrasion from impurities and adapt to changes in temperature and pressure, ensuring safe and stable transportation.

B. Chemical Product Transportation: Suitable for transporting acidic, alkaline, and organic chemical products, these pipes are corrosion-resistant and have excellent sealing properties, preventing chemical leaks and contamination.

C. Power Industry Transportation: Used for the transportation of coal and ash, featuring high structural strength and wear resistance, ensuring stable transportation and preventing blockages.

D. Food Industry Transportation: Suitable for the transportation of fluid foods such as syrup and edible oil, with a smooth inner surface and compliance with hygiene standards, ensuring that food quality is not compromised.

IV. Spiral Welded Pipe Procurement Pitfall Avoidance Guide

A. Supplier Selection
Qualification Review: Ensure suppliers have complete qualifications, with a focus on production licenses and quality system certifications.
Performance Evaluation: Prioritize suppliers with good performance records and reputations.
Equipment and Raw Materials: Evaluate the advanced nature of production equipment and the standardization of raw material management to ensure reliable raw material quality.

B. Procurement Contract
Technical Parameters: Clearly define technical parameters such as pipe diameter, wall thickness, weld bead height, and ovality.
Payment Terms: Adopt staged payments, with the final payment made after third-party inspection approval.
Breach of Contract: Clearly define liability for delayed delivery and quality issues.

C. Quality Inspection
Quality Assurance Documents: Verify the completeness of quality certificates, material specifications, and other relevant documents.
Visual Inspection: Ensure smooth surfaces, tight welds, and no rust or deformation.
Dimension Testing: Use a micrometer to measure outer diameter and wall thickness, ensuring deviations comply with standards.
Non-destructive testing: Use a flaw detector to inspect weld quality.
Bending strength test: Bending at 30 degrees without cracks.
Multi-dimensional testing: Conduct random inspections of ultrasonic testing, flattening tests, hardness tests, etc.
Dimension accuracy: Use a laser diameter measuring instrument to inspect outer diameter and ellipticity.
Surface quality: Establish clear standards for rust grades and scratch depths through sample retention.

D. Logistics and Warehousing
Transportation protection: Require appropriate transportation protection measures to prevent deformation of the pipe ends.
Storage environment: Ensure the storage environment meets requirements to prevent corrosion.

E. After-sales service
After-sales support: Select suppliers with a comprehensive after-sales service system to ensure timely resolution of quality issues.