Titanium Coil Tube for Hydrolysis Tank Applications
Product Overview
The Titanium Coil Tube (Product No. 1663) is a specialized heat-exchange coil manufactured by Wenzhou Jixing Metal Materials Co., Ltd, engineered specifically for deployment within Hydrolysis Tanks (Hydrolysis Vessels). This product represents a precision-engineered solution for high-corrosion, high-temperature industrial environments where conventional stainless steel tubing exhibits accelerated degradation. The coil tube is fabricated from Pure Titanium Grade 1 or Grade 2 (ASTM B338 / ASTM B348), delivering exceptional resistance to chlorinated media, alkaline solutions, and oxidative hydrolysis environments.
Unlike standard stainless steel coil tubes, this titanium variant leverages the self-passivating oxide layer (TiO₂) that forms spontaneously on the surface, providing unparalleled long-term durability in aggressive chemical processing environments. The coil geometry maximizes the heat transfer surface area within a confined volume, making it an ideal choice for jacketed reactor systems and batch hydrolysis processes.
Material & Properties
The coil tube is constructed from Commercially Pure Titanium (CP-Ti), conforming to international standards including ASTM B338 (Titanium and Titanium Alloy Tubing), ASTM B348 (Titanium and Titanium Alloy Bar, Rod, and Section), and GB/T 3620.2 (Chinese National Standard for Titanium Tubes).
- Material Grade: Titanium Grade 1 (ASTM B338 Grade 1) or Grade 2, with oxygen content ≤ 0.25% and iron content ≤ 0.30%
- Density: 4.51 g/cm³ — approximately 45% lighter than equivalent stainless steel (304/316L), reducing vessel loading
- Corrosion Resistance: Immune to hydrolysis media containing sodium hydroxide (NaOH), hydrochloric acid (HCl), and mixed chloride-sulfate solutions up to 80°C
- Temperature Range: Operational from −250°C to +350°C, with sustained performance at hydrolysis temperatures of 120–200°C
- Mechanical Strength: Tensile strength of 240–450 MPa (annealed condition); yield strength of 170–310 MPa
- Thermal Conductivity: 21.9 W/(m·K) at 25°C — adequate for efficient heat exchange in hydrolysis processes
- Galvanic Compatibility: Compatible with titanium, zirconium, and Hastelloy C-276; requires isolation from carbon steel and mild steel to prevent galvanic corrosion
Specifications
| Parameter | Specification | Standard / Reference |
|---|---|---|
| Product Name | Titanium Coil Tube (Hydrolysis Tank Type) | — |
| Product Code | 1663 | — |
| Material | Pure Titanium Grade 1 / Grade 2 | ASTM B338; GB/T 3620.2 |
| Outer Diameter (OD) | 12 mm – 25 mm (customizable) | — |
| Wall Thickness | 0.8 mm – 2.0 mm | — |
| Coil Inner Diameter (ID) | 100 mm – 500 mm | — |
| Coil Length | 0.5 m – 6.0 m (configurable per vessel design) | — |
| Coil Pitch | 15 mm – 40 mm (adjustable for heat transfer optimization) | — |
| End Connection | Flanged (ASME B16.5), Threaded (NPT/BSP), or Welded (TIG) | ASME B16.5; ASME B1.20.1 |
| Surface Finish | Mirror polished (Ra ≤ 0.4 μm) or Standard mill finish | — |
| Pressure Rating | Up to 1.6 MPa (design pressure, depending on wall thickness) | ASME BPV Code Section VIII |
| Operating Temperature | −250°C to +350°C | — |
| Hydrostatic Test | 1.5× design pressure, minimum 30 seconds hold | ASME BPV Code |
| Manufacturing Standard | ASTM B338 / GB/T 3620.2 | — |
| Applicable Standards | ASTM B348; EN 12672; JIS G4502 | — |
Manufacturing Process
The production of titanium coil tubes for hydrolysis tank applications follows a rigorous, multi-stage manufacturing sequence designed to ensure metallurgical integrity, dimensional accuracy, and surface quality:
- Raw Material Selection & Inspection: Titanium ingots (Grade 1 or Grade 2) are procured from certified smelters and subjected to spectroscopic analysis (OES) to verify chemical composition, including oxygen, nitrogen, carbon, and iron content limits.
- Pipe Extrusion & Drawing: Titanium billets are hot-extruded into seamless tube blanks, followed by cold drawing through precision dies to achieve the target outer diameter and wall thickness with tolerances within ±0.05 mm.
- Heat Treatment (Annealing): Drawn tubes are annealed in a controlled argon atmosphere at 650–850°C to relieve residual stresses, restore ductility, and ensure a uniform microstructure. This step is critical for preventing intergranular corrosion during subsequent service.
- Pipe Bending & Coiling: Using a CNC-controlled pipe bending machine, straight tubes are formed into the specified coil geometry. The bending process employs internal mandrel support to prevent ovalization, with bending tolerances controlled within ±1.0 mm on coil diameter and ±2 mm on coil pitch.
- Welding (if applicable): Any required joints are fabricated using Tungsten Inert Gas (TIG) welding (GTAW, per AWS D10.9) under a protective argon or helium atmosphere to prevent oxidation of the weld zone. Back-purging is maintained at ≥ 1000 ppm oxygen scavenged levels.
- Surface Finishing: Tubes undergo mechanical polishing, chemical pickling (HNO₃/HF solution), and passivation to remove surface contaminants and establish the protective TiO₂ passive film.
- Non-Destructive Testing (NDT): Each coil tube undergoes 100% Helium Leak Testing (ASTM E2923) and Visual Inspection (VT, per ASTM E165). Radiographic testing (RT) is performed on critical welds per ASME Section V Article 2.
- Hydrostatic Pressure Testing: Final product is pressure-tested at 1.5× the design pressure with a minimum 30-second hold time, with zero leakage tolerance.
Applications
The titanium coil tube is purpose-engineered for demanding hydrolysis and chemical processing environments. Key application domains include:
- Hydrolysis Tanks & Vessels: Primary application — serving as an internal heating/cooling coil within hydrolysis reactors processing cellulose, plastics, polymers, and organic compounds under alkaline or acidic conditions.
- Chemical Processing: Heat exchange in reactors handling hydrochloric acid, sulfuric acid, sodium hydroxide, and other aggressive chemical media where stainless steel (304/316L) would suffer from pitting and crevice corrosion.
- Pharmaceutical & Biotech: Sterilizable heating coils in bioreactors and fermentation tanks requiring USP Class VI or equivalent material compliance.
- Food & Beverage Processing: Hygienic-grade heating coils in CIP (Clean-in-Place) systems where corrosion resistance and non-contamination are paramount.
- Pulp & Paper Industry: Digestion tanks and hydrolysis units processing wood pulp with high-chloride black liquor.
- Waste Treatment & Recycling: Hydrolysis reactors for chemical recycling of mixed plastics and organic waste streams.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system and holds the following certifications relevant to titanium coil tube manufacturing:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control
- ISO 14001:2015 — Environmental Management System certification
- ISO 45001:2018 — Occupational Health and Safety Management System certification
- ASME "S" Stamp — Authorization for pressure vessel and piping component manufacturing (where applicable)
- EN 10204 3.1 — Third-party material certification for each production batch
- Material Test Reports (MTR): Each shipment includes full chemical composition analysis, mechanical property test results, and dimensional inspection reports traceable to the specific heat number
- NDT Certification: In-house inspection personnel certified per ASNT SNT-TC-1A or ISO 9712 Level II for visual testing, radiographic testing, and leak testing
Unique Selling Points: The titanium coil tube from Wenzhou Jixing Metal Materials Co., Ltd offers a decisive advantage over conventional stainless steel alternatives in hydrolysis applications. With a service life exceeding 15 years in aggressive media — compared to 2–3 years for 316L stainless steel — the total cost of ownership is substantially reduced through elimination of frequent replacement cycles. The 45% weight reduction also decreases vessel structural loading requirements, enabling lighter and more economical reactor designs. Custom coil geometries, end configurations, and surface finishes are available to match specific vessel designs and process requirements.