Stainless Steel Coil Tube — Hydrostatic Pressure Tested (Static Water Pressure Holding)
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. presents its premium stainless steel coil tube, engineered for maximum safety, integrity, and long-term service reliability. Every coil tube produced undergoes a rigorous hydrostatic pressure test (static water pressure holding) as a mandatory pre-shipment inspection — ensuring zero leakage under conditions exceeding the tube's rated design pressure. This quality gate guarantees that each unit delivered to the customer meets the highest standards of pressure containment and structural soundness.
Material & Properties
- Material Grade: Available in 304, 304L, 316, 316L, 321, 347, and custom alloy specifications
- Form: Continuous coil tube (Coiltube), supplied in rolled coil configuration for seamless downstream forming and fabrication
- Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and general oxidation across a wide pH and temperature range
- Mechanical Properties: High tensile strength with excellent ductility, enabling cold bending, forming, and expansion without cracking
- Hygienic Surface: Available in BA (Bright Annealed) or 2B finish; electropolished or passivated surfaces optional for sanitary applications
Specifications
| Parameter | Specification / Standard |
|---|---|
| Product Category | Stainless Steel Coil Tube (盘管 Coiltube) |
| Test Category | Pressure Test — Hydrostatic (Water) Pressure Test |
| Test Method | Static Water Pressure Holding (静水保压) |
| Test Pressure | 1.5 × Design Pressure (working pressure) |
| Hold Duration | ≥ 5 seconds |
| Acceptance Criteria | No visible leakage, no pressure drop, no deformation |
| Inspection Status | Mandatory — 100% pre-shipment inspection |
| Reference Standards | ASTM A778 / ASTM A269 / EN 10217-7 / GB/T 14976 |
| Coil Diameter | Customizable per customer requirements |
| Tube OD × Wall | Customizable — typical range 6 mm – 100 mm OD |
Manufacturing Process
- Raw Material Selection: Only certified stainless steel wire rod from accredited mills is used, with full chemical composition and mechanical property traceability.
- Tube Drawing & Sizing: Precision cold-drawing or hot-finishing processes produce tubes to exact dimensional tolerances (±0.05 mm on wall thickness).
- Coiling: Tubes are wound into uniform coils using CNC-controlled coiling equipment to prevent deformation, kinking, or surface damage.
- Hydrostatic Pressure Testing (Static Water Pressure Holding):
- Each tube is sealed at both ends and filled with pressurized water.
- Pressure is raised to 1.5 times the design (working) pressure.
- Pressure is held for a minimum of 5 seconds.
- Visual and instrument-based inspection confirms zero leakage and no measurable pressure decay.
- Any tube failing the test is immediately quarantined and scrapped — never reworked or re-tested.
- Final Inspection & Packaging: Dimensional verification, surface inspection, and protective coil wrapping prior to dispatch.
Key Selling Points
- 100% Hydrostatic Test Coverage: Every single tube — not a sample — is pressure-tested before shipment, eliminating the risk of latent defects reaching the end user.
- 1.5× Design Pressure Margin: The test pressure provides a built-in safety factor of 50% above operating conditions, validating the tube's ability to withstand transient surges and overpressure events.
- Zero-Tolerance Quality Gate: Any indication of leakage results in immediate rejection — ensuring only defect-free product enters the supply chain.
- Full Traceability: Each coil is traceable to its mill heat number, test batch, and inspection record, supporting compliance audits and regulatory requirements.
Applications
The hydrostatic-tested stainless steel coil tube is suitable for demanding applications where pressure integrity is non-negotiable:
- Heat Exchangers & Condensers: Coil tubes for shell-and-tube, plate-fin, and spiral heat exchangers in HVAC, power generation, and petrochemical plants.
- Medical & Pharmaceutical Equipment: Autoclaves, sterilization systems, and CIP (Clean-in-Place) piping where leak-free integrity is critical.
- Food & Beverage Processing: Sanitary-grade tubing for milk processing, brewing, and juice lines requiring pressure-resistant hygienic components.
- Hydraulic & Pneumatic Systems: Coil tubing for fluid power circuits, hydraulic hoses, and compressed air distribution networks.
- Automotive & Aerospace: Fuel lines, brake lines, and cooling system coils requiring certified pressure resistance.
- Energy & Oil/Gas: Downhole tubing, wellhead components, and process piping in corrosive, high-pressure environments.
Quality Certifications & Compliance
- ISO 9001:2015 — Quality Management System certified manufacturer
- ISO 14001 — Environmental Management System
- CE Marking — Compliance with European Pressure Equipment Directive (PED 2014/68/EU)
- NACE MR0175 / ISO 15156 — Resistance to sulfide stress cracking (for applicable grades)
- ASME BPV Code — Available for pressure vessel components
- Full Material Test Reports (MTR) provided with each shipment
- Hydrostatic Test Reports available upon request for audit and traceability purposes
Wenzhou Jixing Metal Materials Co., Ltd. is committed to delivering stainless steel coil tubes that are safe, reliable, and fully validated through 100% hydrostatic pressure testing. Our static water pressure holding protocol — 1.5× design pressure, ≥5 second hold, zero leakage — ensures that every coil tube meets the rigorous demands of modern industrial applications.