Stainless Steel Coil Tube for Texaco Process Burner Cooling Systems
Product Overview
The Stainless Steel Coil Tube (盘管 / Coil Tube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd (序号: 821) is a precision-engineered heat transfer component specifically designed for demanding industrial applications involving high-temperature burner systems, particularly within the Texaco Gasification Process. This product category encompasses seamless and welded stainless steel tubes formed into helical, spiral, or serpentine coil configurations, optimized for thermal management in combustion environments where conventional straight-tube heat exchangers prove inadequate.
Building upon advanced research and numerical simulation methodologies—including the conversion of cooling water coil tubes to water jacket architectures—the product line addresses critical thermal stress, flow distribution, and heat transfer efficiency challenges encountered in Texaco process burner cooling water systems. The coil tube geometry provides a significantly higher surface-area-to-volume ratio compared to straight tubes, enabling superior convective heat exchange within compact spatial envelopes.
Material Composition & Properties
The coil tubes are fabricated from high-grade austenitic stainless steels selected for their exceptional resistance to thermal cycling, oxidation, and corrosion under aggressive process conditions. Primary material grades include:
- AISI 304 / 1.4301 — General-purpose corrosion resistance with excellent formability for tight coil radii
- AISI 316L / 1.4404 — Enhanced chloride pitting resistance for environments with halide exposure
- AISI 321 / 1.4541 — Stabilized against intergranular corrosion at elevated temperatures (up to 870°C)
- Super Alloy Options — Inconel 625, Hastelloy C-276 for extreme thermal and chemical service
| Property | Specification | Test Standard |
|---|---|---|
| Tensile Strength (抗拉强度) | ≥ 520 MPa (AISI 304); ≥ 550 MPa (AISI 316L) | ASTM A269 / A213 |
| Yield Strength (屈服强度) | ≥ 205 MPa (AISI 304); ≥ 170 MPa (AISI 316L) | ASTM A269 |
| Operating Temperature Range (工作温度范围) | −196°C to +870°C (grade-dependent) | ASTM A312 |
| Corrosion Resistance (耐腐蚀性) | Equivalent to 10× carbon steel; superior pitting resistance (PREN ≥ 20 for 316L) | ASTM G48 |
| Thermal Conductivity (导热系数) | 16.3 W/(m·K) at 100°C (AISI 304) | ASTM E153 |
| Thermal Expansion Coefficient (热膨胀系数) | 17.3 × 10⁻⁶ /°C (AISI 304, 20–300°C) | ASTM E228 |
| Surface Roughness (表面粗糙度) | ≤ Ra 0.8 μm (polished finish); ≤ Ra 1.6 μm (standard finish) | ASTM B473 |
Technical Specifications
| Parameter | Specification / Range | Remarks |
|---|---|---|
| Outer Diameter (外径, OD) | Φ 6 mm – Φ 50 mm | Custom sizes available upon request |
| Wall Thickness (壁厚) | 0.5 mm – 3.0 mm | ± 10% tolerance on wall thickness |
| Coil Pitch (盘管节距) | 15 mm – 150 mm | Configurable for heat transfer optimization |
| Minimum Bend Radius (最小弯曲半径) | ≥ 3 × OD (cold bending); ≥ 2 × OD (hot bending) | Ensures no cross-sectional deformation |
| Coil Length (盘管长度) | Up to 50 m per continuous coil | Weld-free single-piece construction preferred |
| Coil Diameter (盘管直径) | Φ 100 mm – Φ 2000 mm | Adaptable to burner geometry |
| End Connection Type (端部连接方式) | Threaded (NPT/BSP), Flanged, Butt-weld, Soldered | Custom fittings available |
| Surface Finish (表面处理) | Pickled & Passivated (酸洗钝化), Electropolished, Brushed | PASS Test ≥ 48 hours for passivated finish |
| Maximum Working Pressure (最大工作压力) | Up to 25 MPa (grade and geometry dependent) | Hydro-tested at 1.5 × working pressure |
| Heat Transfer Coefficient (传热系数) | 2,500 – 8,000 W/(m²·K) (internal convection) | Enhanced by coil-induced secondary flow |
Manufacturing Process
The production of high-performance stainless steel coil tubes follows a rigorously controlled multi-stage manufacturing sequence:
- Raw Material Selection & Verification — Ingot certification (MTC) is verified against ASTM/EN specifications. Incoming material undergoes spectral analysis (PMI) and chemical composition confirmation via wet chemistry or OES.
- Seamless Tube Production — Hot-rolled or cold-drawn seamless tubes conforming to ASTM A269/A213 are sourced or manufactured. Cold drawing ensures precise dimensional tolerances (± 0.05 mm on OD, ± 10% on wall).
- Pickling & Passivation — Tubes are subjected to pickling (酸洗) in mixed acid baths (HNO₃/HF or HNO₃/H₂SO₄) followed by passivation (钝化) to establish a stable chromium oxide passive film (≥ 100 Å thickness).
- Coil Forming / Bending — Precision CNC coil-forming machines apply controlled bending forces to create helical or serpentine geometries. Tooling is designed to prevent cross-sectional ovality (≤ 5% of nominal OD) and wrinkling. Hot bending (> 1,000°C) is employed for tight radii with super-alloy grades.
- Stress Relief Annealing — Post-forming annealing at 1,050–1,150°C (grade-dependent) relieves residual bending stresses, restores full solution-annealed microstructure, and ensures consistent mechanical properties throughout the coil.
- End Processing & Fitting Installation — Coil ends are machined, beveled (ASME B16.25), or threaded to specification. Flanges or threaded couplings are welded or fitted as required.
- Non-Destructive Testing (NDT) — 100% hydrostatic pressure testing at 1.5 × maximum working pressure. Random ultrasonic testing (UT) per ASTM E127 for wall thickness verification. Radiographic testing (RT) of critical welds per ASME Section V.
- Final Inspection & Packaging — Dimensional verification via coordinate measuring machine (CMM) or laser scan. Protective end caps, desiccant packaging, and moisture-barrier wrapping for shipment.
Applications
The stainless steel coil tube product line serves a broad spectrum of high-temperature industrial applications:
- Texaco Gasification Process Burner Cooling — Primary application. The coil tube configuration provides efficient cooling water circulation around gasifier burners operating at 1,200–1,600°C, preventing refractory degradation and burner tube overheating. Numerical simulation (数值模拟) studies have demonstrated that coil-to-water-jacket conversions can optimize thermal distribution and reduce hot-spot formation.
- Petrochemical Reactor Cooling — Internal coil tubes within exothermic reactors manage reaction heat removal.
- Power Generation — Boiler economizer and superheater coil tubes in coal-fired and gas-fired power plants.
- Automotive & Aerospace — Engine cooling circuits, exhaust heat recovery systems, and aircraft hydraulic cooling loops.
- Food & Pharmaceutical Processing — Sanitary-grade coil heat exchangers for pasteurization, CIP (Clean-In-Place) systems, and thermal sterilization.
- Nuclear Industry — Control rod drive mechanism cooling, secondary coolant loops, and containment heat removal.
- Marine & Offshore — Subsea heat exchangers, shipboard cooling systems, and desalination plant thermal recovery.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains comprehensive quality assurance systems aligned with international standards:
- ISO 9001:2015 — Quality Management System certification covering all manufacturing and inspection processes
- ISO 14001:2015 — Environmental Management System for sustainable production practices
- ASME / NB — Authorization for pressure vessel and piping components (where applicable)
- EN 10204 3.1 / 3.2 — Third-party inspection and material certification per European standard
- ASTM A269 / A213 / A312 — Product specifications for seamless austenitic stainless steel tubes
- ASME B31.3 / B31.1 — Compliance for process piping and power piping applications
- NACE MR0175 / ISO 15156 — Resistance to sulfide stress cracking for oil and gas service
- CE Marking — Conformity with European Pressure Equipment Directive (PED 2014/68/EU)
Every coil tube assembly is accompanied by a full Mill Test Certificate (MTC), Hydrostatic Test Report, NDT Report, and Dimensional Inspection Record, ensuring complete traceability from raw material to final delivery.
Unique Selling Points
1. Simulation-Validated Design: Leveraging computational fluid dynamics (CFD) and finite element analysis (FEA) from Texaco burner cooling research, coil geometries are numerically optimized for maximum heat transfer efficiency and uniform temperature distribution.
2. Seamless Single-Piece Construction: Eliminating weld joints within the coil eliminates potential failure points under thermal cycling and pressure transients, significantly enhancing reliability and service life.
3. Coil-Induced Secondary Flow Enhancement: The helical geometry generates Dean vortices that increase turbulent mixing, boosting the convective heat transfer coefficient by 30–50% compared to straight tubes of equivalent diameter and flow velocity.
4. Full Customization Capability: From OD, wall thickness, pitch, and coil diameter to end fittings and surface finish—all parameters are configurable to match specific burner geometry and process conditions.
5. Proven Industrial Track Record: Deployed in Texaco gasification units, petrochemical reactors, and power generation facilities worldwide, with documented performance exceeding design specifications over extended operational cycles.
Conclusion
The Stainless Steel Coil Tube product from Wenzhou Jixing Metal Materials Co., Ltd represents the convergence of advanced metallurgical engineering, precision manufacturing, and simulation-driven design optimization. Engineered for the most thermally demanding industrial environments, these coil tubes deliver exceptional heat transfer performance, mechanical integrity, and corrosion resistance—making them an indispensable component in next-generation energy and chemical processing systems.