TA2 titanium tubes for heat exchangers in chemical plants, 5 years without leakage secrets

Last week, I received a call from a purchasing staff of a chemical plant in Zhejiang, The dilute sulfuric acid heat exchanger in their workshop adopts 316L stainless steel pipe, Corrosion perforation occurred in only 3 months, Looking for alternative materials suitable for working conditions.Combined with Baoji China Titanium Valley's many years of special materials project experience, we recommend TA2 seamless for customerstitanium pipeThe equipment has been in use for 5 years without leakage problems.This article will share this real chemical heat exchanger material selection case to provide reference for equipment material selection in the dye and fine chemical industries.

Customer pain point: frequent corrosion causes production disruption This chemical plant mainly produces dye intermediates, Dilute sulfuric acid heat exchanger for reaction kettle, The medium is 5% dilute sulfuric acid, Operating temperature 80℃.316L stainless steel heat exchange tubes were initially selected for the equipment, and pitting and perforation appeared only after 3 months of use.Subsequent replacement of PTFE lining, Extended service life up to 8 months, But the thermal conductivity of PTFE lining material is poor, Direct constraints on plant productivity.Every tube bundle replacement operation requires 5-7 days of shutdown, and the economic losses caused by shutdown maintenance remain high.

Why TA2titanium pipeCan it be used stably for 5 years? TA2 titanium pipeThe corrosion resistance in dilute sulfuric acid environment is obviously better than 316L stainless steel and PTFE lining materials.The core principle is that titanium metal contacts oxygen-containing media, A dense titanium dioxide passivation film will spontaneously form on the surface, The passivation film can repair itself after being damaged.Specific performance, 5% dilute sulfuric acid, 80℃ working condition, TA2 Corrosion rate less than 0.05mm per year, The corrosion rate of 316L stainless steel can reach 0.5mm per yearThe passivation film can be repaired within 24 hours after damage, and corrosion will not continue.At the same time, titanium has good pitting resistance and crevice corrosion resistance, and is suitable for equipment components with complex structures such as heat exchange tubes.

Our recommended selection options Combined with field operating parameters, Finally, a complete titanium heat exchanger scheme is given, Material TA2 industrial pure titanium, Corresponding to American standard Gr2Heat exchange tube specification Φ25×2mm seamlesstitanium pipe, implement GB/T 3624-2010;The total number of bundles is 286, and the length of each bundle is 3 meters.The matching parts are also made of TA2 material, includingtitanium pipeboard, Titanium baffles and special gaskets, Complete set of equipment unified titanium, Avoid corrosion risks caused by different material combinations, Ensure consistent overall corrosion resistance.

Implementation effect: five-year field operation data Five-year operation record of heat exchanger after putting into use, First year of operation, Heat transfer coefficient reaches 17.5 W/m·K, 15% higher than original 316L bundle, Plant capacity increasedIn the second year, there is no obvious thinning in wall thickness detection, and the measured corrosion rate is less than 0.03mm per year.After overhaul and disassembly inspection in the third year, the passivation film on the surface of the tube bundle is complete without pitting corrosion and pitting corrosion;In the fifth year, the equipment is still in normal operation, and the estimated overall service life can reach 8-10 years. Customer feedback on the most significant benefits, No unplanned parking in 5 years, The annual maintenance cost and shutdown loss are about 150,000 yuan.

TA2 titanium pipeHeat exchanger three advantages According to this case summary, TA2 is better than traditional materials.titanium pipeHeat exchangers have three core advantages: longer service life, service cycle up to 5-10 years, is 5-10 times that of 316L stainless steel;Excellent thermal conductivity, heat transfer efficiency is better than tetrafluoroethylene-lined materials, and production capacity is increased by 10%-20%;Low maintenance costs, relying on the self-healing properties of the passivation film, no additional cathodic protection or corrosion protection coating is required.

Application of Titanium in Heat Exchangers: Class 3 Working Conditions titanium pipeGB/T 3624-2010 What about TA2 and TA10?3 dimensions clearly stated The 6 most frequently asked titanium questions

TA2 titanium pipeWhat's the market price for a meter? Φ25×2mm TA2 seamlesstitanium pipeRegular quotation range 300-450 yuan/m, Final price is subject to pipe specifications, purchase amount, Market raw material market fluctuation influence, The thicker the wall, the higher the price., Customizing the length incurs additional tooling costs.

How many years can TA2 titanium tubes be used? Under the conditions of dilute sulfuric acid and chloride-containing media, the typical service life of TA2 titanium pipes is 8-15 years;and that service life of the product in the seawater environment can reach 15 to 20 year;Strong corrosive media such as concentrated hydrochloric acid and hydrofluoric acid are not suitable for using titanium materials.

316L stainless steel and TA2 titanium tube which comprehensive cost effective? The initial purchase cost of TA2 is about 3-4 times that of 316L stainless steel, but the service life is 5-10 times that of 316L.From 5 - 10 years of full life cycle accounting, TA2 comprehensive use cost will be reduced by 30%-50%.

Titanium tube heat exchanger installation needs to pay attention to what matters? Three key precautions: avoid direct contact between titanium and dissimilar metals to prevent galvanic corrosion;Argon arc welding technology is adopted for welding, and interlayer temperature is strictly controlled;Clean water shall be selected for hydrostatic pressure test, and medium with high chlorine content shall be avoided.

What testing items do titanium tubes need to be manufactured? Routine test items include chemical composition test, mechanical property test and hydrostatic test;Ultrasonic inspection and eddy current inspection are added to titanium tubes used for key equipment;Titanium tubes for medical use additional biocompatibility testing.

What warranty information do suppliers need to provide when purchasing titanium tubes? Provide at least three copies of materials: quality assurance of raw materials, marked with furnace number and brand;Processing warranty, indicating specifications and processing technology;Third-party inspection report, SGS, CTI, Pony can be.