Why Titanium in Chemical Plant
Titanium combines high strength-to-weight ratio, outstanding corrosion resistance and moderate density, which makes it one of the most versatile engineering materials in chemical processing. The stable oxide film on its surface self-heals in oxidizing environments and gives the metal immunity to seawater, chlorides and wet chlorine. Equipment built from titanium often outlasts stainless steel and nickel alloys by a wide margin in the same duty.
Media Resistance Profile
The corrosion performance of titanium is strongest in oxidizing media and weakest in hot reducing acids. It resists seawater, brackish water, chloride brines, wet chlorine gas, hypochlorite, nitric acid and most organic acids. Hot concentrated hydrochloric and sulfuric acids attack the metal, and these services are handled with palladium-stabilized grades such as Grade 7 and Grade 11.
Heat Exchangers and Condensers
Shell-and-tube exchangers, plate exchangers and condensers are the largest titanium application in chemical plant. Tube bundles resist erosion by high-velocity cooling water and eliminate the corrosion failures common with copper alloys and stainless steel. Titanium tubes are rolled or welded into tube sheets, and the bundle weight is roughly 60 percent of a steel equivalent.
Reactors and Vessels
Reaction vessels, storage tanks and columns are fabricated from titanium plate with welded construction and lined or solid-wall design. Titanium lining of steel shells is an economical way to gain corrosion resistance while keeping structural cost low. Agitators, baffles and internal coils are also produced in titanium to match the vessel life.
Piping and Anodes
Process piping in titanium carries aggressive streams that would rapidly thin stainless steel lines, and the low density simplifies pipe supports. Titanium anodes are standard in chlor-alkali cells and impressed-current cathodic protection systems, where they operate for years with negligible consumption. Pump casings, valves and instrument wetted parts complete the titanium equipment package.
Service Limits
The main limitation of titanium in chemical service is reducing acid attack, and designers must also respect its ignition risk in oxygen-enriched streams and its sensitivity to iron contamination on the surface. Proper grade selection, clean fabrication and controlled welding avoid these problems. The result is a material with a long, predictable service life in the most aggressive plant environments.
Frequently Asked Questions
Q: Why is titanium used in chemical plants?
A: Its oxide film resists seawater, chlorides, oxidizing acids and wet chlorine, giving equipment life that stainless steel cannot match.
Q: Which media attack titanium?
A: Hot concentrated reducing acids such as hydrochloric and sulfuric acid, which require palladium-stabilized grades.
Q: What is the largest titanium application in chemical plant?
A: Heat exchangers and condensers, where tubes resist corrosion and erosion by cooling water.
Q: How is titanium used in chlorine service?
A> In wet chlorine gas handling, hypochlorite systems and chlor-alkali anodes where the metal is virtually immune to attack.
Q: Is titanium cheaper than stainless steel?
A: The material cost is higher, but longer life and lower maintenance often make the installed cost competitive over the equipment lifetime.
Q: Can titanium equipment be welded?
A: Yes, with argon-shielded welding and strict cleanliness to protect the molten metal from oxygen and nitrogen pick-up.
