Titanium Plate Selection and Thickness for Heat Exchangers
Introduction
Heat exchangers in chemical processing plants, desalination units, and seawater systems face significant challenges: corrosive fluids, high temperatures, and mechanical stresses. Selecting the right Titanium Plate grade, thickness, and surface finish is essential to maximize efficiency, safety, and operational lifespan.
GR2 Titanium Sheets are widely applied in shell-and-tube and plate heat exchangers, offering excellent corrosion resistance, high thermal conductivity, and long-term durability. Proper design and installation, coupled with correct welding and post-weld treatment, prevent leaks, material degradation, and costly downtime.
Natural internal linking: For detailed thickness selection, see Titanium Sheet Thickness Guide. For welding methods, refer to Titanium Sheet Welding and Fabrication Techniques.
1. Titanium Plate Selection
1.1 Grade Recommendations
| Grade | Corrosion Resistance | Thermal Performance | Suitable Application |
| GR1 | Moderate | Good | Low-pressure, mild chemical or seawater exposure |
| GR2 | Excellent | Superior | High-pressure, aggressive seawater or chemical exposure |
Case Study 1:
At a coastal chemical plant, replacing stainless steel plates with GR2 pickled titanium sheets in the heat exchanger resulted in zero corrosion after 8 years. Stainless steel counterparts previously required replacement every 3–4 years.
Case Study 2:
A seawater desalination unit used Gr1 Titanium sheets in low-pressure sections above water. After 6 years, the system maintained structural integrity and corrosion-free performance, demonstrating that GR1 is suitable for mild exposure zones.
1.2 Thickness Selection
| Heat Exchanger Type | Recommended Plate Thickness (mm) | Operating Pressure (bar) | Temperature (°C) | Notes |
| Small Shell-and-Tube | 2–3 | <5 | 60–80 | Low-pressure, moderate flow |
| Medium | 3–5 | 5–10 | 80–120 | Standard chemical process |
| Large / High Pressure | 6–10 | 10–20 | 120–180 | High-corrosion, high-pressure applications |
Engineering Insight:
- High-pressure or high-corrosion environments require thicker platesto ensure mechanical integrity and long-term durability.
- For thermal efficiency, thinner plates may suffice in low-pressure systems, but must balance mechanical strength.
Case Study 3:
A GR2 shell-and-tube exchanger with 8 mm plates operated in a high-temperature chemical plant. After 5 years, there was no evidence of corrosion, scaling, or leaks, validating proper thickness selection for high-stress conditions.
1.3 Welding and Surface Finish Considerations
- TIG Welding:Best for thin-to-medium plates (<6 mm)
- Plasma Welding:Preferred for thick plates (>6 mm)
- Post-Weld Pickling:Essential to restore the passivation layer in HAZ
- Surface Finish:
- Bright Annealed (BA) for internal heat exchanger surfaces
- Pickled for high-corrosion zones (seawater or aggressive chemicals)
Example:
A GR2 pickled heat exchanger in a desalination plant used plasma welding on 10 mm thick plates, with post-weld pickling applied. Inspection after 7 years showed zero leaks and excellent corrosion resistance.
2. Installation and Maintenance Recommendations
- Ensure proper alignment and flatnessduring installation to avoid mechanical stress
- Perform pre-assembly inspectionfor surface defects or scratches
- Maintain periodic cleaning schedulesto prevent fouling and scaling
- Use titanium fastenersto prevent galvanic corrosion
Case Study 4:
A chemical plant installed GR2 plates using CTL processing with precise thickness adherence, resulting in over 10 years of corrosion-free operation and reduced maintenance downtime.
3. Engineering and Procurement Perspective
- Grade Selection:GR2 for immersion or high-pressure zones, GR1 for mild exposure areas
- Thickness Determination:Based on pressure, temperature, and chemical aggressiveness
- Fabrication Requirements:Ensure supplier supports CTL, welding, forming, and post-weld pickling
- Procurement Tip:Clearly specify grade, thickness, surface finish, and post-weld treatment to guarantee operational performance
Practical Tip:
Engage with engineering teams early to match plate thickness to exchanger design, reducing risk of leaks and early replacement.
4. FAQ – Detailed
Q1: Can GR1 plates be used in seawater heat exchangers?
A: Only in low-pressure or non-immersed zones. GR2 is recommended for continuous immersion or high-pressure applications.
Q2: Is post-weld pickling necessary?
A: Yes, it restores the passivation layer in welded areas, preventing early corrosion.
Q3: How to select the correct thickness?
A: Consider operating pressure, temperature, fluid corrosiveness, and mechanical load. Thicker plates are preferred for high-stress zones.
Q4: Are BA plates suitable for seawater exposure?
A: Only for mild exposure; pickled plates are preferable for high-salinity or chemically aggressive fluids.
Q5: How often should inspections be conducted?
A: Visual inspections annually, and full internal checks every 3–5 years, depending on fluid and operating conditions.
5. Conclusion
At ProX Metal, we provide GR1 and GR2 titanium sheets with comprehensive services, including CTL processing, leveling, edge trimming, welding, and pickling. Our team ensures your projects achieve long-term, corrosion-resistant, and cost-effective performance for chemical, desalination, and marine applications.
For practical tips and fabrication guidance, explore Cut-to-Length Titanium Sheet Guide and Titanium Sheet Welding and Fabrication Techniques.