Titanium Tube Sheet Selection Guide| 5 kinds of materials +3 cases + domestic import price + processing pit avoidance

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-24

A wet chlorine cooler in a chlor-alkali plant failed after 18 months of operation.After disassembly, it is found that the root cause lies in the wrong selection of tube plate material, DRAWING NOTE TA2 SOLID TUBE SHEET, The supplier shall deliver Q235 carbon steel composite plate instead.Carbon steel base perforated in short time under wet chlorine condition, bundle shedding, Shell side and tube side dielectric leakage, The entire heat exchanger cannot continue to be used.Tube plate is the core component of shell and tube heat exchanger, Heat exchange in heat exchanger bundle, medium-tight, Equipment pressure and bundle to shell connection, All rely on tube plate to realize.This article systematically combstitanium pipeplate type, industry application, project cases, Processing technology and procurement pit avoidance points, For chemical equipment procurement, Reference for engineering designers.

Take root in Baoji China Titanium Valley, Shaanxi Qianyi Tuoda Technology Co., Ltd. FocusTitanium non-standard equipmentProcessing, can be customized to various specificationstitanium pipePlate, titanium heat exchanger supporting components, suitable for chlor-alkali, PTA, seawater desalination and other corrosion conditions.titanium pipeFull solution to selection

titanium pipeThe board contains five common structural materials.TA2 solid tubesheet is machined from a single piece of industrially pure titanium, as a price reference, Suitable for small and medium diameter equipment with nominal diameter less than 500 mm, Applicable to atmospheric pressure to 1.6MPa working conditionsTA10 solid tubesheet Ti-0.3Mo-0.8Ni titanium molybdenum nickel alloy, Procurement costs are 1.5 to 1.7 times higher than TA2, Adapt to crevice corrosion, High temperature wet chlorine conditionsTA2 + Q345R composite plate tubesheet with 3 to 5 mm TA2 cladding and Q345R carbon steel base, overall cost compared to solidTitanium Plate30%-50%, suitable for DN600 and above large-diameter equipment, composite plate coating thickness should not be less than 2 mm, to prevent perforation risk in the expansion stage, composite interface shear strength is not less than 140MPa, NB/T 47002 standard acceptance;TA9 Local Composite Tubesheet, TA9 palladium titanium material is used in the deposition area at the bottom of tube plate, Cost 2.5 to 3 times TA2, Conditions for reducing acid deposition at the bottomTA2 lined tube sheet, carbon steel shell with titanium lining structure, suitable for atmospheric pressure large tank equipment.

Selection of reference ideas and titanium reactor,Titanium Flangeselection logic is consistent.TA2 solid tubesheet is preferred for medium and small equipment with nominal diameter less than 500 mm;For large diameter equipment above DN600, TA2 + Q345R explosive composite plate tube plate can be selected for cost control;There is crevice corrosion risk under working conditions, so TA10 solid tube plate shall be selected;Reducing acid is easy to deposit at the bottom of medium, TA9 partial composite tube plate can be selected.

titanium pipeThe plate has several key geometric parameters, and the nominal diameter covers DN200 to DN2000;The thickness range of the plate is 30 to 150 mm, which directly determines the pressure bearing performance and expansion strength;the number of the pipe holes is tens to thousands, corresponding to the heat exchange area of the heat exchanger;The distance between the center of the tube holes is 1.25 times of the outer diameter of the heat exchange tube, which affects the tube layout rate.Common pipe hole specifications adapt Φ19, Φ25, Φ32 heat exchange tubes;Seal groove width 8 to 15 mm, matching gasket.Tube sheets are generally arranged at both ends of the heat exchanger shell, Two tubesheet fixed bundle, Baffles are installed in the shell to change the flow direction of the medium, Improve heat exchange efficiency.Titanium PlateFull solution to selection

titanium pipeThe board is widely used in seven major industries.Chlor-alkali industry, the medium is 80℃ wet chlorine, secondary brine, optional TA2 solid or high temperature working condition TA10 material, specifications DN300-DN1200;PTA/PET industry, contact with bromine-containing acetic acid 120℃ medium, select TA9 local composite tube plate, DN500-DN1500;Seawater desalination project, secondary steam and seawater medium 60-120℃, TA2 solid or composite board, DN800-DN2000;Hydrometallurgy field, dilute nickel cobalt sulfate solution working condition, TA2 solid tube plate, DN300-DN800;Pharmaceutical food industry, dilute hydrochloric acid, organic solvent environment, High purity TA2 solid tubesheetElectroplating industry, chromic acid, plating solution conditions, TA2 composite plate or solid plate can be DN200-DN500;TA2 composite plate tube sheet, DN300-DN800, is selected for marine power seawater cooling system.

Share three project application cases as technical reference for selection.Case 1, 600,000 tons of caustic soda plant wet chlorine cooler tube sheet, specification DN800, plate thickness 80 mm, TA2 solid tube sheet, medium 80℃ wet chlorine, tube side pressure 1.6MPa, with about 600 Φ25×1.0 titanium heat exchange tubes.316L tubesheet with Hastelloy tube bundle was used in the original scheme. Pitting and perforation appeared after 18 months operation.After TA2 solid tubesheet was replaced with TA2 tubesheet, the equipment operated stably for a long time.Case 2: PTA oxidation reactor condenser tube plate, DN1500, plate thickness 120 mm, TA2 + Q345R composite plate tube plate, medium 120 ℃ bromine acetic acid vapor condensation, with 1800 TA9 heat exchange tubes.The original 316L PTFE lining tube plate failed after several years of use, After transformation, the equipment runs stably, Composite plate cladding thickness 4 mm, The composite interface meets NB/T 47002 acceptance criteria.Case 3: Multi-effect evaporation project of overseas million-ton seawater desalination, DN2000, plate thickness 150mm TA2 + Q345R composite plate tube plate, medium 70℃ secondary steam and 30℃ seawater, supporting about 5000 Φ19×0.8 thin wallstitanium pipe。Pitting corrosion of 316L material in high chloride ion crevice condition for two years, After using titanium clad plate tube sheet, The equipment operates stably.TC4 titanium alloy selection solution

titanium pipeThe precision requirement of plate processing is higher than that of titanium reactor and shell processing, The center distance of pipe holes shall be controlled within ±0.05mm., Tube hole roughness Ra≤12.5μm, The accumulative error of pipe laying area is less than 0.3mm.The complete process flow includes incoming inspection of the plates, verification of the material certificate and re-inspection;NC rough machining reserved machining allowance;Finish machining to drawing size, control flatness;CNC drilling machine processing pipe holes;NC milling sealing groove;Turning grinding sealing surfaces;Pipe hole chamfering and deburring;100% penetration testing;pickling passivation treatment;Retest the size and carry out hydrostatic test, and the test pressure shall be 1.5 times the design pressure;Vacuum or nitrogen-filled protection, packed in wooden cases.There are many key control indicators in the processing link, Drilling is prohibited grinding wheel to prevent iron pollution, Aperture with H7 tolerance, With special titanium cutting fluid, Fine grinding of sealing surface ensures sealing effect.

titanium pipePlate design and manufacturing need to follow a set of standards, Reference GB/T 151-2014 for basic design of shell-and-tube heat exchangerRefer to GB/T 12459 and GB/T 13401 for geometric size of pipe fittings;NB/T 47014 shall be executed for qualification of pressure welding;NB/T 47013 series standards shall be implemented for nondestructive testing ray and penetrant testing;NB/T 47002 shall be executed for acceptance of titanium-steel explosive clad plate;Refer to HG/T 20592 for flange seal, ASME BPVC Section VIII and TEMA heat exchanger code for check strength can be superimposed for outlet items.purchase domestictitanium pipePlate compared to imports, Cost can be reduced by more than half, Domestic TA2 solid tubesheet DN500 specification, Price range 130-180 yuan per kg, The price of imported products of the same specifications is 2 to 2.5 times higher.

There are five types of problems that need attention during the processing stage.Firstly, the drilling accuracy is insufficient, and the deviation of the pipe hole exceeds the standard, which will lead to difficulties in assembling the bundle and leakage of the expansion position.Second, the size of the expansion groove is not properly processed, the expansion strength is insufficient, the tube bundle falls off, and the medium leaks;Third, the sealing surface hardness is insufficient, gasket compression deformation caused by sealing leakage;Fourth, thick plate welding deformation, plate thickness greater than 80 mm, after welding need vacuum annealing stress relief;Fifth, the composite plate interface bonding defects, titanium coating peeling when expanding the tube, equipment scrap.

There are also five types of risks in purchasing titanium tube sheets.The supplier supplied the goods with TA2 as TA10, and short-term perforation occurred under crevice corrosion condition;The clad thickness of the composite plate is reduced and does not meet the requirements of the drawings;The tolerance of center-to-center distance of pipe holes exceeds the standard, and the bundle cannot be assembled;The roughness and hardness of the sealing surface are not up to standard, and leakage continues after operation;PT and RT NDT reports are missing, and hidden dangers of pipe hole cracks are not detected.Material designation shall be specified in the procurement contract, thickness of plating, nominal diameter, hole tolerance, cladding index of composite plate, Sealing surface parameters and nondestructive testing requirements.

Titanium tube plate selection can follow the five-step method, the first step to sort out the working conditions of medium, concentration, temperature, pressure, chloride ion content;Step 2: Determine the type of corrosion, TA2 is selected for oxygen-chloride-ion seawater working condition, TA9 was selected as the reducing acid for bottom deposition, TA10 is selected for crevice corrosion conditionThe third step is to determine the structure form, medium and small diameter solid plate, large diameter composite plate;step four, calculate that thickness of the plate, simultaneously satisfying the requirement of bearing pressure, expansion joint and process allowance, and the composite coating is not less than 3 mm;The fifth step is to agree on inspection items, conventional 100% penetration inspection, and increase radiation inspection for key equipment.

Industry development direction presents large-scale, composite, Precision features, Demand for large size titanium tube sheets above DN2000 increases year by year, Titanium steel clad plate scheme can effectively control project investment, NC drilling with visual inspection to improve machining accuracy.Industry data show that the domestic titanium heat exchanger market has grown steadily, driving the continuous increase in demand for titanium tube sheets.

Frequently Asked Questions

Q1: How to choose titanium tube sheet and stainless steel tube sheet? Chlorine ion medium containing oxygen, such as wet chlorine, seawater, and dilute acids, Titanium tube sheet is preferred for scenes without metal ion precipitation in medicine and foodStainless steel tube plate is more suitable for clean water, ordinary steam, low chloride ion medium.Titanium tube sheet procurement costs higher than stainless steel, but the equipment service life is longer. Q2: DN500 solid plate or composite plate? DN500 and below generally choose TA2 solid tubesheet;DN600 and above are given priority to evaluate the composite plate scheme, taking into account pressure, corrosion resistance and economy. Q3: How much cladding thickness of composite plate meets the specification? According to NB/T 47002, coating thickness of not less than 3 mm, 4 mm and above is recommended for expansion conditions, Less than 2 mm is not recommended for expansion conditions.

written in the end, tubesheet integrated pressure, seal, connect, fluid distribution multifunction, Improper selection of materials and processing, This will cause the entire heat exchanger to be scrapped.Selection focuses on the nominal diameter, plate thickness, coating thickness, sealing surface grade, palladium content of five indicators;Manufacturing control pipe hole center distance, hole diameter tolerance, sealing surface roughness, composite interface strength, nondestructive testing coverage;The inspection shall focus on the internal and external surfaces, pipe holes, sealing surfaces and composite interfaces of the plates. Author: Titanium non-standard technical number| Shaanxi Qianyi Tuoda Technology Co., Ltd.(Baoji·China Titanium Valley)

disclaimer, Case Study, performance data, Price range is only for technical selection reference, Not as a formal commercial offer commitment.The actual use of materials depends on the medium, temperature, welding technology, Impact of on-site operation and maintenance conditions, Shaanxi Qianyi Tuoda Technology Co., Ltd. reserves the right to interpret this article.