Author: Senthil Kumar, Technical Director | Updated: September 2026
Table of Contents
- What Is a Titanium Heat Exchanger?
- Why Titanium — The Corrosion Science
- Types of Titanium Heat Exchangers
- Key Components and Grades
- Engineering Advantages
- Design Standards — ASME, ASTM and TEMA
- Industries and Applications
- Titanium vs Stainless Steel vs Copper-Nickel
- Why United Heat Exchangers
- Delivery
- Frequently Asked Questions
What Is a Titanium Heat Exchanger?
A titanium heat exchanger uses commercially pure titanium or titanium alloy tubes and plates in place of stainless steel or copper alloys wherever the process or cooling medium contains aggressive chlorides — seawater, brine, or chlorinated process streams that would pit, crevice-corrode, or stress-crack conventional metals within a single operating season.Titanium forms a dense, self-healing titanium dioxide (TiO₂) passive film on contact with oxygenated water. This film is chemically inert to chlorides at essentially all concentrations and temperatures encountered in industrial service, making titanium the default tube and plate material for seawater-cooled condensers, desalination trains, and chlor-alkali process coolers. United Heat Exchangers designs and fabricates titanium shell-and-tube and titanium plate heat exchangers to ASME Section VIII and TEMA for power, desalination, marine, and chemical process clients across India and 30+ export markets.
Why Titanium — The Corrosion Science
Every metal used for heat transfer surfaces relies on some form of surface protection against the process or cooling medium. Titanium's protection is unusual in that it improves rather than degrades over time in oxygenated saline water — the passive oxide film self-heals instantly if scratched or abraded, as long as trace oxygen is present.
Oxide Film Forms
On exposure to oxygenated water, titanium immediately forms a tenacious TiO₂ passive layer nanometres thick.
Chloride Ions Rejected
Unlike stainless steel, chloride ions cannot penetrate or destabilise the titanium oxide film at any practical seawater concentration.
Erosion Resistance Holds
High tube velocities and entrained silt or biofouling debris do not remove the film faster than it re-forms.
Film Self-Heals
Any local mechanical damage to the oxide layer re-passivates within milliseconds in the presence of oxygen.
Decades of Service Life
Titanium condenser tubes routinely exceed 25–30 years in continuous seawater service with no wall loss.
Engineering Insight — Where Titanium Is Mandatory, Not Optional: Once chloride content in the cooling or process stream exceeds roughly 200–400 ppm at elevated temperature, 316L stainless steel becomes susceptible to pitting and chloride stress corrosion cracking. Seawater runs at approximately 19,000–20,000 ppm chloride — several orders of magnitude beyond the threshold. At that concentration, titanium is not the premium option; it is the only tube material with a proven multi-decade service record.
Types of Titanium Heat Exchangers
United Heat Exchangers builds titanium into the same core exchanger configurations offered in carbon steel and stainless steel, with mechanical design rules adjusted for titanium's lower modulus of elasticity and different galvanic behaviour.
Titanium Shell and Tube Heat Exchanger
Titanium tubes inside a carbon steel or clad shellTitanium tubes are the most common configuration — the shell and channel remain carbon steel or stainless, with only the surfaces in contact with the corrosive stream built in titanium.
- Fixed tubesheet, U-tube, or floating head per TEMA type
- Titanium tubesheets or titanium-clad tubesheets to prevent galvanic attack at the joint
- Standard for seawater and brackish water condensers and coolers
- Lowest-cost titanium configuration — only wetted parts use the alloy
Titanium Plate Heat Exchanger
Thin titanium plates for compact, high-efficiency dutiesCorrugated titanium plates gasketed or fully welded into a compact frame give very high heat transfer coefficients in a fraction of the footprint of an equivalent shell-and-tube unit.
- EPDM or Viton gaskets rated for the process temperature and chemistry
- Fully welded or brazed construction for high-pressure or leak-critical duties
- Preferred where plot space is limited — marine engine rooms, skid packages
- Plates easily added or removed to adjust duty without a new exchanger
Fully Titanium-Clad Construction
Titanium-clad tubesheet, channel and shell interiorFor the most aggressive duties, tubesheets, channel covers, and shell interiors are explosion-bonded or weld-overlay clad with titanium over a carbon steel or low-alloy backing plate.
- Full corrosion protection on every wetted pressure boundary
- Carbon steel backing retains structural strength and lowers material cost
- Used in chlor-alkali cell coolers and high-chloride process condensers
- Cladding qualified per ASME Section IX procedure and bond-strength testing
Solid Titanium Construction
All pressure parts in titanium — maximum corrosion marginTubes, tubesheets, channel, and shell are all fabricated in titanium where the process side is as corrosive as the cooling side, or where absolute leak-tightness against galvanic attack is required.
- No dissimilar-metal joints — eliminates galvanic corrosion risk entirely
- Standard for chlorine, hypochlorite, and wet chlorine gas cooling duties
- Higher material cost offset by near-zero maintenance over service life
- Available in Grade 2 (CP) or Grade 5 (Ti-6Al-4V) for higher strength duties
Key Components and Titanium Grades
Titanium Tubes
Seamless or welded tubes to ASTM B338, typically Grade 1 or Grade 2 commercially pure titanium. Grade 2 is the industry default for condenser and cooler tubes — good strength with excellent formability for tube expansion into the tubesheet.
Titanium or Clad Tubesheet
Solid titanium, titanium-clad, or loose titanium liner tubesheets to ASTM B265 plate stock. The tube-to-tubesheet joint is roller expanded, welded, or both, depending on pressure class and vibration exposure.
Channel and Shell
Typically carbon steel or low-alloy steel with an internal titanium clad liner, coating, or full titanium fabrication on the wetted face — sized and designed to ASME Section VIII Division 1 as an independent pressure vessel.
Baffles and Tie Rods
Titanium or coated carbon steel baffles direct shell-side flow across the tube bundle and support the tubes against flow-induced vibration — material selected based on shell-side fluid corrosivity.
Isolation Gaskets and Fasteners
Non-metallic isolation gaskets or coatings prevent direct contact between titanium and carbon steel flanges, and titanium or coated fasteners are used at any joint exposed to the process or cooling stream to prevent galvanic attack.
Sacrificial Anodes (Where Specified)
On carbon steel waterboxes paired with titanium tubes, zinc or aluminium sacrificial anodes are fitted to manage the galvanic couple and protect the less-noble steel surfaces.
Engineering Advantages of Titanium Heat Exchangers
Immune to Chloride Pitting
Titanium does not pit, crevice-corrode, or stress-crack in seawater, brine, or chlorinated process streams — the failure modes that limit 316L and even duplex stainless steel to a fraction of titanium's service life.
Lower Total Life-Cycle Cost
Higher material cost per kilogram than stainless steel, but a 25–30 year service life with negligible tube replacement or unplanned outage cost gives titanium the lowest total cost of ownership in high-chloride duties.
High Strength-to-Weight Ratio
Titanium tubes can run thinner walls than copper-nickel or stainless for the same pressure rating, cutting bundle weight roughly 40% versus copper-nickel — a real benefit for offshore platforms and marine installations.
Excellent Erosion Resistance
High water velocities that erode copper alloys within a few years leave titanium tubes unaffected, allowing smaller-diameter, higher-velocity tube bundles and a more compact, lower-cost exchanger footprint.
Biofouling Resistance
Titanium's smooth, hard oxide surface resists marine growth attachment better than copper alloys, reducing cleaning frequency and helping maintain design thermal performance for longer between shutdowns.
Non-Toxic, Non-Reactive
Titanium is biocompatible and chemically inert in most process fluids, making it suitable for food-grade, pharmaceutical, and potable water applications alongside its corrosion-resistance role in marine and chemical service.
Design Standards — ASME, ASTM and TEMA
Every titanium heat exchanger from United Heat Exchangers is designed, sourced, and documented to the following codes.
| Standard | Scope | Key Output |
|---|---|---|
| ASME Section VIII Div. 1 | Pressure vessel design of shell, channel, and tubesheet — wall thickness, weld NDE, and hydrostatic test at 1.3× MAWP | ASME U-Stamp; Manufacturer's Data Report (Form U-1) signed by Authorised Inspector |
| ASTM B338 | Seamless and welded titanium and titanium alloy tubes for condensers and heat exchangers — chemical composition, mechanical properties, and eddy-current test acceptance | Mill test certificates; 100% eddy-current or hydrostatic tube test reports |
| ASTM B265 | Titanium and titanium alloy strip, sheet, and plate for tubesheets, baffles, and clad liners | Traceable mill certification for every plate used in pressure parts |
| TEMA Class R / C / B | Mechanical design rules for tube pitch, baffle spacing, tube-to-tubesheet joints, and bundle removal — Class R for refinery-severity service, Class C for commercial, Class B for chemical process | TEMA-compliant mechanical drawing set and tube layout |
| HTRI Xist Software | Rigorous thermal and hydraulic rating — tube-side and shell-side heat transfer, pressure drop, and vibration analysis specific to titanium tube properties | Guaranteed thermal performance certificate; vibration analysis report |
Specification Tip: Confirm chloride concentration, oxygen content, temperature, and velocity of both process and cooling streams before material selection — these four parameters determine whether Grade 1, Grade 2, or a titanium-clad hybrid construction is the correct and most cost-effective choice. United Heat Exchangers reviews this with you as part of the technical proposal.
Industries and Applications
| Industry | Typical Duty | Process Stream | Configuration |
|---|---|---|---|
| Desalination (MSF / MED / RO) | Brine heater, condenser tube bundles, seawater intake coolers | Concentrated seawater brine at elevated temperature | Titanium shell-and-tube, Grade 2 tubes, titanium tubesheet |
| Power Generation | Surface condenser tubes; seawater-cooled auxiliary coolers | Once-through or recirculated seawater cooling | Titanium tubes in carbon steel waterbox with sacrificial anodes |
| Marine & Offshore | Engine jacket water coolers, HVAC chillers, FPSO process coolers | Raw seawater cooling medium | Compact titanium plate heat exchanger; low weight for topside loads |
| Chlor-Alkali | Chlorine gas cooler, hypochlorite cooler, brine cooler | Wet chlorine gas; sodium hypochlorite; saturated brine | Solid titanium construction — no dissimilar-metal joints |
| Pharmaceutical & Food Processing | CIP-compatible process heating and cooling, WFI system coolers | High-purity water and process fluids requiring non-reactive contact surfaces | Fully welded titanium plate heat exchanger, polished finish |
Titanium vs Stainless Steel vs Copper-Nickel
| Parameter | Titanium (Grade 2) | 316L Stainless Steel | Copper-Nickel (90/10) |
|---|---|---|---|
| Seawater / Chloride Resistance | Immune to pitting and SCC at any chloride concentration | Pits and stress-corrosion cracks above ~200–400 ppm chloride at temperature | Good general corrosion resistance; sensitive to erosion-corrosion at high velocity |
| Typical Service Life (Seawater) | 25–30+ years, often exceeding plant design life | Frequently under 5 years in continuous seawater service | 10–15 years, shortened by erosion at velocities above ~3 m/s |
| Relative Weight | Lightest of the three at equal pressure rating | Moderate — denser than titanium | Heaviest — highest density of the three alloys |
| Erosion / High-Velocity Tolerance | Excellent — tolerates velocities well above copper alloy limits | Good, though pitting risk dominates the failure mode in chlorides | Limited — erosion-corrosion sets a firm velocity ceiling |
| Relative Material Cost | Highest per kilogram, lowest life-cycle cost in chloride service | Lowest initial cost, but frequent replacement in high-chloride duty | Mid-range initial cost with moderate maintenance burden |
When to Choose Titanium: Titanium is the correct choice whenever seawater, brine, or another high-chloride stream contacts the tube or plate surface — the initial cost premium is consistently recovered through eliminated tube replacement, reduced downtime, and a service life that typically matches or exceeds the life of the parent plant.
Why United Heat Exchangers
Titanium Fabrication Specialist
Qualified welding procedures for titanium-to-titanium and titanium-clad joints, including orbital TIG welding for tube-to-tubesheet joints under an inert gas purge to prevent oxide contamination.
HTRI Xist Thermal Guarantee
Bundle geometry, baffle spacing, and tube layout optimized in HTRI Xist for titanium's specific thermal and vibration properties. We issue a guaranteed thermal performance certificate with every order.
ASME U-Stamp Certified
Pressure parts carry the ASME U-Stamp with full Manufacturer's Data Reports, alongside traceable ASTM B338/B265 mill certification for every titanium component sourced.
30+ Countries — Full In-House Engineering
From process datasheet to certified fabrication drawing — thermal design, material selection, and export documentation — entirely in-house, no subcontracting. Delivered to desalination and marine clients across 30+ countries.
Get a Free Titanium Heat Exchanger Quote in 48 Hours
Send your process duty, chloride concentration, fluid properties, and site location. We return an HTRI-sized thermal proposal, material grade recommendation, and budgetary quote within 48 hours.
Request My Free Quote →Delivery and What's Included
- HTRI Xist thermal and vibration analysis — tube-side and shell-side heat transfer, pressure drop, and flow-induced vibration check specific to titanium tube properties
- ASME U-Stamp and Manufacturer's Data Report (Form U-1) — for all pressure parts, signed by Authorised Inspector; MAWP and design temperature stamped on nameplate
- ASTM B338 / B265 mill certification — full material traceability for every titanium tube, plate, and tubesheet used in the exchanger
- Weld procedure qualification records — orbital TIG procedures for titanium tube-to-tubesheet joints, with inert-gas purge verification
- NDE reports — 100% eddy-current or hydrostatic tube testing; RT/UT for pressure butt welds, signed by ASNT Level II inspector
- Operations and maintenance manual — tube cleaning procedure, galvanic protection maintenance, anode replacement schedule, and 2-year spare parts list
Frequently Asked Questions — Titanium Heat Exchanger
What is a titanium heat exchanger used for?
A titanium heat exchanger uses titanium tubes or plates wherever the process or cooling stream contains aggressive chlorides — seawater, brine, or chlorinated process fluids — that would pit or crack stainless steel or erode copper alloys. It is standard for desalination, seawater-cooled power condensers, marine cooling, and chlor-alkali service.
Why is titanium better than stainless steel for seawater?
Stainless steel's passive chromium oxide film breaks down and pits in the presence of chloride ions above roughly 200–400 ppm at temperature. Titanium's oxide film is chemically inert to chlorides at any practical seawater concentration and self-heals instantly if mechanically damaged, giving it immunity to pitting and stress corrosion cracking that stainless steel cannot match.
Which titanium grade is used for heat exchanger tubes?
Grade 1 and Grade 2 commercially pure titanium are the standard tube grades to ASTM B338. Grade 2 is the most common choice, offering a good balance of strength and formability for tube expansion into the tubesheet. Grade 5 (Ti-6Al-4V) is used only where higher mechanical strength is specifically required.
Does a titanium heat exchanger need the whole unit to be titanium?
No. Most units use titanium tubes and a titanium or titanium-clad tubesheet inside a conventional carbon steel shell and waterbox — this protects only the wetted surfaces at the lowest material cost. Fully solid titanium construction is reserved for duties where the process side is equally corrosive, such as chlorine gas cooling.
How is galvanic corrosion managed between titanium and carbon steel?
Where titanium tubes are fitted into a carbon steel waterbox, isolation gaskets or coatings prevent direct metal contact at flanged joints, and sacrificial zinc or aluminium anodes are fitted in the waterbox to protect the less-noble steel surfaces from the galvanic couple.
What is the lead time for a titanium heat exchanger from India?
Standard titanium-tube shell-and-tube exchangers with a carbon steel shell deliver in 8–12 weeks. Solid titanium, titanium-clad, ASME U-Stamp, or large custom-engineered units take 14–22 weeks depending on tube quantity and cladding requirements. Expedited delivery is available for plant shutdowns and emergency replacements — contact us with your timeline.
Author: Senthil Kumar, Technical Director — United Heat Exchangers Pvt. Ltd. | Last Updated: September 2026
