High-Pressure Stainless Steel Coil Tube (Coiltube) for Ultra-High-Pressure Pumping Systems

Product Overview

The High-Pressure Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered flexible tubing solution designed for extreme-pressure fluid and material delivery applications. This product has been validated through rigorous experimental testing simulating vertical pumping to a height of 880 meters using high-strength, high-performance C130 concrete, establishing it as a benchmark product in the super high-rise construction and heavy industrial pumping sectors.

The coil tube architecture provides superior flexibility, fatigue resistance, and pressure containment under continuous cyclic loading conditions, making it indispensable in applications where rigid piping is impractical or impossible to deploy.

Material & Properties

The coil tube is fabricated from premium-grade austenitic stainless steel, selected for its exceptional combination of tensile strength, corrosion resistance, and ductility under extreme operational conditions.

Specifications

Parameter Specification Standard / Reference
Product Designation Coiltube (盘管) — Item No. 755 —
Outer Diameter (OD) 19 mm – 168 mm (customizable) ASTM A312
Wall Thickness 0.5 mm – 12 mm EN 10216-5
Coil Pitch 20 mm – 100 mm (application-dependent) Internal Standard
Coil Diameter 300 mm – 3,000 mm —
Maximum Operating Pressure Up to 50 MPa (validated at 880 m vertical delivery) Experimental Validation
Surface Finish Electro-polished (Ra ≤ 0.4 μm) or Pickled & Passivated ASTM A967
End Connections Welded fittings, flanged, threaded, or socket-weld ASME B16.9
Material Grade 304 / 316L / 321 / 904L / Duplex 2205 ASTM / EN / GB
Flexibility Cycles ≥ 50,000 flex cycles (fatigue validated) Internal Testing Protocol
Delivery Length Coiled on spool or cut-to-length —

Manufacturing Process

The production of high-pressure coil tubes follows a meticulously controlled multi-stage manufacturing process to ensure dimensional accuracy, metallurgical integrity, and mechanical performance:

  1. Material Selection & Incoming Inspection: Certified stainless steel coils are sourced from approved mills, with full chemical composition verification (via spectroscopy) and mechanical property testing prior to processing.
  2. Coil Forming (Tube Coiling): Precision cold-forming equipment winds straight stainless steel tubing into the designated coil geometry with controlled pitch and diameter, ensuring uniform residual stress distribution throughout the coil structure.
  3. Heat Treatment (if applicable): Solution annealing at 1050–1150°C followed by rapid quenching to restore full ductility and eliminate cold-work hardening, ensuring the coil tube retains maximum flexibility after forming.
  4. Surface Treatment: Electro-polishing or pickling and passivation removes surface contaminants and forms a protective chromium oxide layer, enhancing corrosion resistance and hygiene compliance.
  5. Hydrostatic Pressure Testing: Each coil tube undergoes 100% hydrostatic testing at 1.5× the rated operating pressure to verify integrity and detect manufacturing defects.
  6. Dimensional Inspection & Non-Destructive Testing (NDT): Ultrasonic testing (UT) and eddy current inspection verify wall thickness uniformity, while dimensional measurements confirm compliance with specified tolerances.
  7. Final Certification & Packaging: Each lot is accompanied by a Material Test Report (MTR) / Certificate of Conformance (CoC), with protective end caps and moisture-barrier packaging for shipment.

Applications

The proven performance of this coil tube in the landmark C130 concrete pumping experiment (880-meter vertical simulation) demonstrates its capability across a wide spectrum of demanding industrial applications:

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality management systems and holds the following certifications and compliance standards:

Unique Selling Points

Validated Ultra-High-Pressure Performance: This coil tube is the only product in its class with documented experimental validation for vertical pumping of C130 ultra-high-strength concrete to a simulated height of 880 meters — a record-breaking achievement in the construction materials industry. This validation confirms the product's capability to withstand extreme cyclic pressures, abrasive media, and sustained vertical gravitational loads simultaneously.