Titanium Tubes Powering the Power and Nuclear Industry: Indispensable Safe Heat Transfer Medium for Core Systems of All Generating Units
Coastal thermal power plants, large inland power stations, commercial nuclear power plants and Small Modular Reactors (SMRs) constitute the mainstay of China’s power energy sector. Generating units operate at full load continuously all year round, with cooling media mostly sourced from seawater, brackish water and high-temperature radioactive circulating water. The combined effects of chloride ions, salt spray, high-temperature water vapor and trace radioactive media impose extremely stringent requirements on heat exchange pipeline components in terms of corrosion resistance, leakage resistance, long-term stability and low radiation absorption.
Heat exchange pipelines made of copper-nickel alloy, stainless steel and carbon steel are prone to pitting corrosion, erosion and crevice leakage after long-term service. Once pipeline damage occurs in condensers or auxiliary coolers, the unit vacuum level drops sharply, power generation efficiency declines, and emergency shutdown maintenance may be forced, resulting in massive electricity losses and potential safety hazards. Thanks to their unique physical and chemical properties, Titanium Tubes fully cover the core heat exchange and medium delivery systems throughout thermal and nuclear power processes, making them the standard piping material for power and nuclear projects worldwide.
I. Full-System Application of Titanium Tubes in the Thermal Power Industry
Coastal thermal power plants in China generally adopt seawater direct cooling circulation systems, while inland river-side power plants mostly use saline and polluted surface water for cooling. Both working conditions carry high risks of chloride-induced corrosion. Titanium tubes are primarily applied in four key pieces of equipment:
1. Steam Turbine Condensers (Largest-Scale Core Application)
Condensers are the core thermal cycle equipment of power generating units. High-temperature steam enters the equipment and condenses through cooling water flowing inside the tubes to maintain stable unit vacuum, which directly determines power consumption and output.
In the early industry, copper-nickel alloy heat exchange tubes were widely used. After 3 to 8 years of high-speed seawater scouring, tube walls suffered perforation and corrosive leakage. Replacing them with 316L stainless steel tubes leads to crevice corrosion under high chloride environments, requiring batch plugging of leaking tubes every year and frequent shutdown maintenance.
Since the adoption of thin-walled titanium heat exchange tubes, the smooth tube walls inhibit scaling and allow seawater flow velocity to rise by 30%. No pitting or erosion risks arise during long-term operation, unit vacuum remains stable all year round, power generation efficiency improves by 1%–2%, and a single unit achieves substantial annual coal savings. Hundreds of coastal power plants in China have completed technical upgrades to titanium tube condensers, with equipment capable of stable continuous service for over 30 years and nearly eliminating major overhaul requirements.
2. Auxiliary Machinery Cooling & Heat Exchange Systems
This system includes generator lube oil coolers, transformer oil-water coolers, air coolers and waste heat recovery heat exchangers. Auxiliary equipment generates constant heat, while cooling water contains sediment and salt. Traditional pipes easily suffer inner-wall fouling and blockage, leading to gradual heat exchange efficiency degradation. The self-passivating oxide film of titanium tubes resists sediment erosion and medium scaling, extending cleaning cycles many times over. It maintains constant temperature operation of fans, oil pumps and excitation equipment and avoids unplanned shutdowns caused by overheating of auxiliary machinery.
3. Flue Gas Waste Heat Pipelines for Desulfurization and Denitrification
Flue gas from coal-fired power plants contains sulfides and high-temperature condensed water rich in chloride ions, which rapidly corrode and perforate ordinary metal pipelines. Titanium tubes are used as heat exchange bundles for low-temperature flue gas waste heat recovery, resisting erosion from acidic condensed media and maximizing waste heat recovery to help power plants meet energy conservation and carbon reduction targets.
4. Circulating Water & Chemical Dosing Delivery Pipelines
Water treatment chemicals for power plant circulating water mostly include hypochlorites and acidic corrosion inhibitors with strong corrosivity. Seamless Titanium Tubes are adopted for chemical delivery and circulating water bypass monitoring pipelines to prevent impurity precipitation from pipe corrosion contaminating cooling water and protect core condenser equipment.
II. Key Applications of Titanium Tubes in Multiple Safety Systems of Nuclear Power Plants
Nuclear power equipment operates under far stricter safety standards than thermal power facilities. Pipeline materials must simultaneously satisfy five mandatory criteria: radiation resistance, low neutron absorption, high temperature and pressure resistance, medium corrosion resistance and long service life. Titanium tubes run through core safety systems including secondary loop cooling, radioactive liquid waste treatment and small modular reactor cooling:
1. Heat Exchange Bundles for Nuclear Secondary Loop Condensers
Condensers matched with nuclear steam turbines mostly use seawater as the cooling medium. Any pipeline leakage will allow seawater impurities to enter the thermal cycle and contaminate steam generators, creating severe safety risks. Nuclear-grade pure titanium tubes feature rigorously controlled impurity content with no heavy metal precipitation and outstanding seawater corrosion resistance. All newly built gigawatt-class nuclear power plants worldwide adopt titanium tube bundles for condensers, with a design service life matching the 60-year lifespan of generating units and zero leakage risks throughout operation.
2. Evaporator Pipelines for Radioactive Liquid Waste
Low and intermediate-level radioactive wastewater generated by nuclear power plants undergoes high-temperature evaporation, concentration and solidification treatment. The wastewater contains chloride ions and radioactive corrosive ions that readily induce stress corrosion cracking in metal pipes under high temperatures. Titanium Alloy tubes serve as heat exchange pipelines for evaporators. Their dense oxide film blocks erosion from radioactive media and avoids chemical reactions with radioactive wastewater, ensuring fully enclosed, safe operation of liquid waste treatment systems and eliminating risks of radioactive medium leakage.
3. Built-In Cooling Pipelines for Small Modular Reactors (SMRs)
New-generation small nuclear reactors feature compact structures with limited internal space for cooling pipelines, requiring lightweight, high-strength pipes resistant to corrosion by high-temperature pure water. Titanium has a density only 57% that of steel. Under equal pressure-bearing conditions, thinner tube walls reduce overall equipment weight, suiting the narrow installation space of modular reactors. Meanwhile, titanium withstands long-term scouring and corrosion by high-temperature pure water in the primary loop, making it a core material for advanced nuclear equipment.
4. Auxiliary Nuclear Island Cooling & Seawater Circulation Pipelines
Seawater intake and circulation cooling pipelines surrounding nuclear islands are permanently submerged in high-salinity seawater and subject to alternating day-night temperature fluctuations. Seamless titanium pipelines resist seawater stress corrosion and thermal fatigue cracking without additional anti-corrosion coatings, greatly lowering maintenance workload for peripheral nuclear island equipment and reducing staff exposure to radiation during inspections.
III. Comprehensive Performance Comparison of Mainstream Piping Materials for Power and Nuclear Industries
| Pipe Category | Seawater Corrosion Resistance | Continuous Service Life | Scaling Tendency | Shutdown Maintenance Frequency | Applicable Power & Nuclear Scenarios | Drawbacks |
| TA2 Industrial Pure Titanium Tube | Excellent, free of pitting and flow erosion | 25–35 years | Extremely low, smooth tube wall | Practically maintenance-free | Thermal power condensers, nuclear secondary loops, waste heat exchange | High upfront procurement cost |
| 90/10 Cupronickel Alloy Tube | Moderate, prone to erosion under high flow velocity | 8–12 years | Moderate, prone to scale buildup | Batch overhaul every 2–3 years | Small inland freshwater generating units | Service life drops sharply under seawater service |
| 316L Stainless Steel Tube | Poor, susceptible to chloride-induced pitting | 5–8 years | Relatively high scaling tendency | Annual leakage inspection and plugging | Temporary freshwater cooling for auxiliary equipment only | Forbidden for main equipment at coastal thermal and nuclear power plants |
| Carbon Steel Pipe | Extremely poor, rapid rusting and perforation | 2–4 years | Severe heavy scale accumulation | Frequent shutdowns for replacement | Temporary low-pressure clean water bypass piping | Corrosion byproducts contaminate thermal systems |
IV. Frequently Asked Questions
Q1: Inland freshwater power plants do not use seawater — is retrofitting titanium condenser tubes still necessary?
A: Yes. Inland river surface water carries sediment, algae and trace chloride ions. Copper and stainless steel pipes still develop scale and corrosion after years of operation. Titanium tubes resist fouling to sustain stable heat exchange efficiency, reduce chemical cleaning frequency and lower long-term operation and maintenance costs.
Q2: What distinguishes nuclear-grade titanium tubes from standard thermal power titanium tubes?
A: Special nuclear-grade titanium tubes are high-purity TA1/TA2 variants with strict limits on iron and oxygen impurities and low neutron absorption rates. Additional dedicated tests for radiation stability and hydrogen content are conducted prior to delivery. Thermal power titanium tubes mainly adopt standard thin-walled TA2 welded tubes optimized for seawater erosion resistance, with simplified inspection standards.
Q3: Can titanium tubes withstand thermal cycling from unit startup and shutdown?
A: Yes. Titanium boasts a low thermal expansion coefficient and outstanding thermal fatigue resistance. Temperature fluctuations from daily unit startup and shutdown will not trigger stress cracks, suiting peak-shaving power plants with intermittent operation cycles.
Q4: Are titanium alloy tubes mandatory for nuclear radioactive liquid waste pipelines?
A: Titanium tubes are required for medium-to-high temperature pipelines carrying chloride-containing radioactive wastewater. Special stainless steel may be used for low-temperature, low-corrosion wastewater, yet it carries latent risks of long-term corrosive leakage. All newly built nuclear power facilities adopt titanium piping to ensure adequate safety margins.
V. Conclusion
Power and nuclear power form the cornerstone of national energy supply. Equipment safety, operational stability and long-term energy efficiency represent core project priorities. Condensers and cooling heat exchange systems act as the lifeline of generating units, and pipe material selection directly determines power station operating costs and safety baselines. With unrivaled strengths including superior seawater corrosion resistance, anti-scaling properties, long service life and minimal maintenance demands, titanium tubes have fully replaced traditional copper and stainless steel pipes, emerging as the standard heat transfer medium for coastal thermal power plants, commercial nuclear stations and cutting-edge small modular reactors.
If you are searching for a stable, reliable titanium tube supplier, please reach out to ProX Metal. We look forward to establishing cooperation with you.