Lao Zhang has worked in equipment procurement in chemical plants for more than ten years. Recently, he was troubled by the selection of titanium tubes: "It is said that titanium tubes are corrosion-resistant, but there are so many models, which one should I choose?" Don't worry, today we will talk about the selection of titanium tubes for chemical pipelines in "human language", which will ensure that you can understand and use it!
"Three Musketeers" of Titanium Pipes for Chemical Pipes, there is always one suitable for you
1. TA2 (industrial pure titanium) - the king of cost-effectiveness
Applicable scenarios: 80% of conventional chemical needs can be handled
Corrosion resistance: It beats stainless steel and performs well in a chloride ion environment (a chlor-alkali plant has used it for 8 years without rusting)
Price advantage: 10-15% cheaper than TA1, it is the first choice for budget-conscious bosses
Use restrictions: Performance decreases when the temperature exceeds 150℃, and it should be used with caution in high-temperature conditions
2. TA9 (Ti-0.2Pd) - palladium-containing noble
Killer: 0.2% palladium element is added, and the corrosion resistance is directly improved.
Actual performance: 98% concentrated sulfuric acid pipelines in an acid plant, TA9 extends the life by 5 times that of TA2
Price dissuasion: 2-3 times more expensive than TA2, but it may be more cost-effective (maintenance costs are saved)
Purchase suggestions: "Life-saving straw" for strong oxidizing media (such as fuming nitric acid)
3. TA10 (Ti-0.3Mo-0.8Ni) - Anti-crevice corrosion expert
Special skills: Specialized in treating all kinds of "disobedience" - crevice corrosion, pitting corrosion
Typical case: In a seawater desalination project, there has been no leakage at the flange connection with TA10
Price positioning: 30% cheaper than TA9, but the performance is not much worse
Applicable working conditions: "Hell mode" containing chloride ions + high temperature (≤200℃)
Selection and avoidance guide - the blood and tears experience of old drivers
1. The pH value of the medium determines life and death
Acidic environment: TA9 performs best (a phosphate fertilizer plant with pH=1, TA9 has been used for 10 years)
Alkaline environment: TA2 is sufficient (a caustic soda plant 50% NaOH pipeline, TA2 has been used for 12 years)
Containing chloride ions: Look for TA10 (a chemical plant seawater cooling system, the number of maintenance times has been reduced to 0 after switching to TA10)
2. Remember the temperature red line
≤80℃: TA2 is economical
80-150℃: consider TA10
150℃: Find a professional design institute quickly, ordinary titanium tubes can't stand it!
3. If the budget is not enough, save money like this
Mixed use: TA9 is used for key parts, and TA2 is used for ordinary sections (a pharmaceutical factory saved 400,000 yuan by doing this)
Replace material with thickness: increase the wall thickness of TA2 to extend the service life (a dye factory increases the wall thickness of the pipeline by 1mm, and uses it for 3 more years)
Second-hand equipment: second-hand titanium tubes from regular channels can be 50% cheaper (but 100% flaw detection is required)
Five soul questions that must be asked when purchasing
"Can you provide performance cases under the same working conditions?" (Photos are required, not PPT)
"Is the flaw detection standard GB/T 12969 or ASTM B338?" (The latter is more stringent)
"Does the welder qualify pressure pipes?" (Operation without a certificate is equivalent to laying a mine)
"What level of pure nitric acid is used for passivation treatment?" (Below CP level will reduce corrosion resistance)
"How many years do you dare to write the warranty period?" (Only those who dare to promise more than 5 years are truly reliable)
Is the new model worth trying?
Although the recently emerged TC4 (Ti-6Al-4V) has high strength, it is unnecessary for titanium pipes for chemical pipelines:
The price is 60% more expensive than TA2
The welding requirements are stringent (a factory scrapped 3 batches before it was qualified)
The corrosion resistance is not as good as pure titanium (certain experimental data shows that the corrosion rate is 20% higher)
Unless your pipeline has to withstand high pressure + corrosion at the same time, it is better to use the "Three Musketeers" honestly!
Conclusion: Choose the right model = save worry for 10 years
Choosing titanium pipes for chemical pipelines is like finding a partner - there is no best, only the most suitable. Remember this formula: "Use TA2 for normal temperature water chlorine, choose TA9 for strong acid and high temperature, and recognize TA10 for flange gaps." Choose according to this idea, and you will not be led by the nose by the supplier!
Next time you see a supplier selling "high-end titanium pipes", you might as well throw this article at him: "Don't do those empty words, I just ask if TA2 can be used in this working condition?" It will make him look at you with new eyes!
