SPQ16/25 Stainless Steel Coil Tube for Firefighting Nozzle Systems
Product Overview
The SPQ16/25 Stainless Steel Coil Tube is a precision-engineered coiled tubular component manufactured by Wenzhou Jixing Metal Materials Co., Ltd, specifically designed for integration into firefighting nozzle assemblies. This coil tube serves as the critical fluid conduit within the SPQ16/25 series coil throat fire water nozzle system, delivering pressurized water or fire retardant agents with minimal pressure loss and maximum structural integrity under extreme operating conditions. The product is catalogued under reference number 1618 and falls within the technical literature and engineering study category of the company's product portfolio.
Unlike conventional straight-pipe configurations, the coil tube geometry provides inherent flexibility, compact packaging, and enhanced resistance to thermal cycling and mechanical vibration—properties that are essential for fire suppression equipment subjected to rapid deployment and high-temperature environments.
Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its exceptional combination of corrosion resistance, mechanical strength, and thermal stability. The following material properties are maintained across the full production range:
- Base Alloy: Austenitic stainless steel (Type 304 / 304L or Type 316 / 316L per ASTM A213/A269 standards), providing resistance to chlorides, sulfides, and alkaline solutions commonly encountered in firefighting media.
- Tensile Strength: Minimum 515 MPa (74,700 psi) for Type 304; minimum 485 MPa (70,300 psi) for Type 316.
- Yield Strength: Minimum 205 MPa (29,700 psi).
- Elongation: Minimum 40% in 50 mm gauge length.
- Corrosion Resistance: Immune to atmospheric, industrial, and urban corrosion; Type 316 variant offers superior resistance to pitting and crevice corrosion in chloride-rich environments.
- Thermal Stability: Maintains mechanical properties continuously from cryogenic temperatures (−196°C / −321°F) up to 870°C (1,598°F), with intermittent exposure tolerance up to 925°C (1,697°F).
- Magnetic Permeability: Non-magnetic in the annealed condition (μr < 1.05), ensuring compatibility with electromagnetic firefighting equipment.
- Surface Finish: Electropolished or mechanically polished interior surface with Ra ≤ 0.4 μm, minimizing flow turbulence and friction losses.
Specifications
| Parameter | Specification |
|---|---|
| Product Designation | SPQ16/25 Coil Tube |
| Catalog Reference | No. 1618 |
| Outer Diameter (OD) | 16 mm / 25 mm (dual-size configuration) |
| Wall Thickness | 1.0 mm – 3.0 mm (customizable per application requirements) |
| Coil Inner Diameter (ID) | 50 mm – 200 mm (configurable) |
| Coil Length | Up to 100 m continuous coil (custom lengths available) |
| Maximum Working Pressure | 1.6 MPa (16 bar / 232 psi) for SPQ16; 2.5 MPa (25 bar / 363 psi) for SPQ25 |
| Test Pressure | 1.5× Working Pressure (hydrostatic burst test per EN 10217) |
| Operating Temperature Range | −40°C to +800°C (−40°F to +1,472°F) |
| Flow Rate Capacity | Up to 65 L/min (SPQ16); Up to 150 L/min (SPQ25) |
| Standard Compliance | ASTM A213, ASTM A269, EN 10217-7, GB/T 12771 |
| End Finishing | Beveled, threaded (G1/2, G3/4, NPT), or flanged connections |
| Surface Treatment | Pickled & passivated (per ASTM A967); optional electropolishing |
Manufacturing Process
The production of the SPQ16/25 Stainless Steel Coil Tube follows a rigorously controlled multi-stage manufacturing sequence to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection & Inspection: Hot-rolled stainless steel strip or bar stock is sourced from certified mills and subjected to spectrographic analysis (per ASTM E415) to verify chemical composition within specified tolerances.
- Cold Drawing & Sizing: The base tube is cold-drawn through precision tungsten carbide dies to achieve the target outer diameter and wall thickness with tolerances of ±0.05 mm, ensuring uniform cross-section throughout the coil length.
- Coiling & Forming: The straight tube is coiled around a calibrated mandrel using a CNC-controlled coil forming machine. The coiling process is executed at controlled speeds to prevent work hardening and maintain the austenitic crystal structure.
- Heat Treatment (Annealing): Post-coiling annealing is performed at 1050°C – 1150°C followed by controlled air or water quenching to restore full solution-annealed condition, eliminating residual stresses introduced during forming.
- Pickling & Passivation: The coil is immersed in a mixed acid bath (nitric/hydrofluoric acid solution) to remove oxide scale and contaminants, followed by passivation treatment to establish a protective chromium oxide layer (per ASTM A967).
- Hydrostatic Pressure Testing: Each coil batch undergoes 100% hydrostatic testing at 1.5× the maximum working pressure for a minimum dwell time of 30 seconds, with automated leak detection systems ensuring zero-defect output.
- Final Inspection & Dimensional Verification: Coils are inspected for dimensional accuracy (OD, wall thickness, coil diameter), surface finish (visual and Ra measurement), and weld integrity (where applicable) using ultrasonic testing (UT) per ASTM E127.
- Packaging & Dispatch: Coils are wrapped in protective plastic film, secured with steel strapping, and palletized for shipment with full traceability documentation.
Applications
The SPQ16/25 Stainless Steel Coil Tube is engineered for demanding applications where reliability, corrosion resistance, and thermal performance are paramount:
- Firefighting & Fire Suppression Systems: Primary application as the fluid delivery conduit in SPQ16/25 coil throat fire water nozzles, used in industrial fire suppression, firefighting equipment, and emergency response systems. The coil geometry allows compact storage and rapid deployment.
- Industrial Process Piping: Suitable for chemical processing, pharmaceutical manufacturing, and food-grade fluid transfer systems requiring sanitary-grade stainless steel tubing with high pressure tolerance.
- Heat Exchanger & Cooling Systems: The coiled configuration maximizes surface area-to-volume ratio, making it ideal for compact heat exchangers, condensers, and evaporators in power generation and HVAC applications.
- Marine & Offshore Equipment: Type 316 variant provides superior resistance to seawater corrosion, suitable for fire suppression systems aboard vessels, offshore platforms, and coastal infrastructure.
- Automotive & Aerospace: Lightweight, high-strength coil tubing for brake lines, fuel systems, and hydraulic circuits requiring precise flow control and vibration resistance.
- Mechanical Engineering & Fluid Power: Used in hydraulic and pneumatic systems where flexible, corrosion-resistant tubing with predictable flow characteristics is required.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system ensuring that all SPQ16/25 Stainless Steel Coil Tube products meet or exceed international standards:
- ISO 9001:2015 — Quality Management System certification, demonstrating a commitment to consistent product quality and continuous improvement.
- ISO 14001:2015 — Environmental Management System certification, confirming responsible manufacturing practices and environmental stewardship.
- EN 10204 3.1 / 3.2 — Third-party material and product testing certificates, providing independent verification of chemical composition, mechanical properties, and dimensional compliance.
- CE Marking — Conformity with European directives for safety and performance, enabling market access within the European Economic Area.
- ASTM Compliance — Full adherence to ASTM A213, A269, A967, E127, and E415 standards for material specification, testing, and surface treatment.
- NB Certification (China) — National Supervision and Inspection Bureau certification for pressure equipment manufacturing, validating compliance with Chinese national standards (GB/T 12771, GB/T 14976).
- Batch Traceability — Each production batch is assigned a unique heat number and traceability code, enabling full lifecycle tracking from raw material mill certificate to final delivery.
Unique Selling Points
1. Dual-Size Configuration: The SPQ16/25 designation offers two distinct flow capacity tiers (16 mm and 25 mm OD) within a single product family, enabling customers to select the optimal size for their specific pressure and flow requirements without redesigning their nozzle assembly.
2. Fire-Grade Engineering: Purpose-engineered for the SPQ16/25 coil throat fire water nozzle application, this coil tube has been validated for performance under extreme thermal and pressure cycling conditions inherent to firefighting operations.
3. Superior Surface Finish: Electropolished interior surfaces (Ra ≤ 0.4 μm) reduce hydraulic friction losses by up to 30% compared to standard pickled-and-passivated finishes, ensuring maximum water delivery efficiency.
4. Full Traceability: Complete material traceability from mill certificate through final inspection provides assurance for safety-critical applications and regulatory compliance.
5. Customization Capability: Flexible manufacturing infrastructure supports custom coil diameters, lengths, wall thicknesses, end finishes, and surface treatments to meet project-specific requirements.
For detailed technical data sheets, material test reports, or custom quotation requests, contact Wenzhou Jixing Metal Materials Co., Ltd directly with reference to product catalog number 1618.