Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-29
Chemical engineering, marine engineering pipeline system,titanium pipeParts selection is the core link to ensure long-term stable operation of pipelines.Most pipeline leakage and failure problems are not caused by medium corrosion, but by improper matching of selection parameters.Different from conventional pipe selection,titanium pipeThe six core parameters should be determined first, and any parameter deviation will affect the use effect of the whole pipeline.This paper relies on Baoji titanium valley industry practical operation experience, Through six decision points, 5-Step SOP Standardization Process, Systematic explanation of titanium elbow, Titanium tee, Selection method of titanium large and small pipe fittings, Adapt to all kinds of corrosion conditions, can be matchedtitanium pipeComplete the selection and laying of the whole pipeline.
titanium pipeThe complete selection logic consists of six decision points, Covers fitting types, angular reduction, connection type, Material designation, specification parameter, executive standard, Finally, standardized selection results are formed, Accurate matching of operating conditions, Avoid the risk of selection errors.
One, six core selection decision points (industry common standards)
The first decision point is the type of pipe fitting, and the mainstream common structures include elbow, tee, reducer and head.Elbow is mainly used for pipeline flow direction transformation, adapting pipeline turning scene;Three-way is responsible for medium shunt and confluence, mostly used for main pipe and branch pipe docking;the big and small heads realize smooth transition connection of different pipe diameters;End caps are used to seal the end of the pipeline and adapt to all kinds of pipeline finishing conditions.Selection must be strictly based on pipeline layout planning, 1.5D long radius elbow is preferred for 90° turning condition, Avoid local stress concentration problems.
The second and third decision points are elbow angle and diameter reducing structure.Elbow contains 90°, 180° Three common angles, 90° elbow for large angle pipeline steering, 45° elbow shall be selected for small adjustment pipeline, The medium reflux condition is suitable for 180° elbow.The large and small heads are divided into concentric and eccentric, Horizontal installation of pipe priority eccentric head, Gas accumulation can be avoided, Excessive drag problemVertical installation of pipes to adapt to concentric size head, to ensure uniform and stable flow of media.
The fourth decision point is the pipe connection mode, which is divided into butt welding, flange, thread and socket.Butt welding connection sealing good, strong pressure capacity, suitable for high pressure, strong corrosion, long-term operation of chemical pipelines;Flange connection is easy to disassemble and repair, adapt to frequent maintenance pipeline conditions;Thread and socket connection structure is simple, mostly used for small diameter, low pressure and normal temperature temporary pipeline system.80℃ wet chlorine high-pressure pipeline in chlor-alkali industry, preferred butt joint connection, from the source to eliminate the problem of sealing corrosion leakage.
The fifth decision point is material grade matching, accurate selection according to medium working conditions.TA2 pure water is selected for normal chlorine ion-containing seawater and neutral saline water conditions.titanium pipeExcellent cost performance;Dilute sulfuric acid, dilute hydrochloric acid and other reducing acid conditions, suitable for TA10 titanium nickel molybdenum alloy pipe fittings;strong acid, Strong pitting risk conditions and PTA high temperature conditions containing bromide ions, TA9 Titanium Palladium Alloy Fittings, Stable corrosion resistance, can be matched withTitanium forgingAdapt to high pressure corrosion protection conditions.for temperature difference, Line for medium concentration difference, Different materials can be selected in stages, While ensuring the preservation effect,, Effective control of procurement costs.
The sixth decision point is specification and standard parameters, Pipe diameter is determined according to pipe flow accounting, Wall thickness combined with operating pressure, Diameter size superimposed corrosion allowance accurate design.GB/T 12459 national standard shall be implemented for domestic projects, ASME B16.9 for export items, 1.5D long radius structure is preferred for conventional pipe fittings, 3D long radius structure can be selected for high pressure working condition, Improve pipeline fatigue resistance.
II. Four common problems and on-site consequences of type selection errors
In practical engineering, the mismatch of selection parameters will cause various equipment failures.Misuse of concentric heads for horizontal pipelines, It can cause gas accumulation in the pipe, medium flow obstruction, Long-term operation will increase the pump body energy consumption by about 15%.The flange connection is misused under wet chlorine and high temperature conditions, the gasket and flange surface are easy to be corroded, and the sealing failure and medium leakage occur in a short period of time;TA2 replaces TA9/TA10 under high temperature dilute acid condition, Pitting and perforation of pipes can occur, Significantly reduce equipment lifeInsufficient pipe thickness parameters under high pressure conditions, Deformation is easy to occur during long-term operation under pressure, hidden danger of pipe explosion, Affect the stable operation of production line.
III.titanium pipeFive steps SOP process
In order to standardize the selection process and avoid mistakes, the industry has a five-step SOP standard process, covering all selection links.The first step is to confirm the pipe fitting type, and determine the elbow, tee joint, large and small head and seal head structure according to the pipeline function;The second step is to match the angle and the reducing structure, and select the corresponding parameters in combination with the pipeline installation mode;The third step is to determine the pipeline connection mode, and select the type according to the pressure, medium and maintenance requirements;The fourth step combines corrosion conditions and temperature parameters to match TA2, TA9, TA10 and other suitable materials;The fifth step is to calculate the diameter and wall thickness parameters, match the corresponding industry implementation standards, and complete the whole set of selection.This process can be directly used in procurement, design and construction, effectively reducing the probability of type selection errors.
IV.titanium pipeFive essential parameters for procurement
bulk purchasestitanium pipeFive core parameters should be clearly defined to avoid deviation of supply and demand parameters.First, specify the specific structure type of the pipe fitting, Second, mark the caliber., angle, reducing structural parameter, Determination of Titanium Alloy Grade Again, At the same time, clarify the pipeline connection mode, Finally, the product executive standard shall be marked.Purchase acceptance, Furnace Batch Report for Verifiable Products, Mechanical property test data, NDT report and hydrostatic test data, Ensure product quality standards, with
Titanium Plate、titanium pipeAll titanium materials such as supporting procurement.
Five, common selection Q & A
1.5D long radius elbow under normal working conditions is a general type, 1.0D short radius elbows are only suitable for space-constrained scenarios, slightly increases the resistance of the pipeline.Concentric, eccentric head size strictly distinguish installation scenarios, is to ensure smooth flow of media key;High-pressure anticorrosive pipelines frequently overhauled, Combination structure of butt welding and short flange can be adopted, Both sealing and maintenance conveniencePipeline materials do not need to be unified in the whole process, and can be selected differently according to different section medium conditions to maximize cost performance.
Shaanxi Qianyi Tuoda Technology takes root in Baoji Titanium Valley Industrial Cluster, Deeply cultivated titanium processing customization for many years, Familiar with all kinds of chemical, ocean, Standard for selection of nuclear power operating conditions, may providetitanium pipeParts selection consultation, customization production, One-stop supporting services, Full-process control of product quality and delivery cycle, Adapt to the needs of various industrial anti-corrosion pipeline projects.
disclaimerSelection method in this paper, Working condition adaptation scheme is only for industry technical reference, Does not constitute fixed technical standards and commercial commitments, Specific selection shall be combined with actual working conditions of the project, Implementation of design specifications.