Titanium flange pressure rating details: PN6 vs PN10 vs PN25 vs PN40 vs PN63 + 5 working conditions + 5 steps to avoid pits
Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-08-08
Titanium flangeas chemical, high temperature and high pressure, Core sealing connecting piece of marine anti-corrosion equipment, Improper pressure rating selection, It's a short-term leak., The primary cause of seal failure.Shaanxi Qianyi Tuoda Technology Co., Ltd. rooted in Baoji China Titanium Valley, Deeply cultivated titanium non-standard customization for many years, Served a lot of chemicals, environmental protection, Oil and gas engineering projects.In daily selection, parameter mismatch problems are often encountered: drawing mark PN16Titanium flangeThe actual working pressure reaches 2.5MPa, and the adaptation specification should be PN40;In many projects, PN25 flange is directly used to replace PN40, which greatly improves the hidden danger of equipment leakage.This paper systematically disassembles the European standard PN, American Standard Class Dual Pressure System, Detailed explanation of 5 types of mainstream working condition adaptation scheme, Standardized 5-Step Selection Process and 5 Practical Pit Avoidance Techniques, Help engineering technicians, Procurement staff completed accuratelyTitanium flangePressure class selection, adapt to actual production conditions.
Combined with years of experience in non-standard projectsTitanium flangePressure selection can be summarized into three core judgment dimensions, which are suitable for most industrial scenarios.First, match PN or Class pressure according to the actual operating pressure of the equipment, and reasonably reserve safety margin;Second, strictly check the pressure degradation coefficient corresponding to the operating temperature, and the high temperature environment will be greatly attenuated.Titanium flangeRated pressure performance;Third, combined with the corrosion characteristics of the medium, bolt specifications and quantity comprehensive check, multi-dimensional guarantee selection compliance.Pressure class adaptation deviation, There is a high probability that seal leakage will occur within 1-3 months of operation, Initiate equipment shutdown, material loss and other issues, Unnecessary operating costs.
European standard PN series is widely used in domestic industrial projectsTitanium flangePressure standard, different grades corresponding to the fixed room temperature pressure range and adaptation scenario.PN6Titanium flange20℃ normal temperature rated pressure 0.6MPa, suitable for low pressure water supply, ventilation and other light load conditions;PN10 rated pressure 1.0MPa, mostly used for atmospheric water supply, medium pressure ventilation conventional equipment;PN16 Rated pressure 1.6MPa, American Standard Class150, Medium pressure water supply, low temperature steam conditionPN25 rated pressure 2.5MPa, suitable for medium pressure steam, condensing medium equipment;PN40 Rated pressure 4.0MPa, American Standard Class300, It is the mainstream selection of high pressure chemical reaction equipment.PN63, PN100 ultra-high pressure grade, respectively adapted to ultra-high pressure chemical, high pressure oil and gas transmission harsh conditions.Industry Procurement, PN40 has a higher purchase cost than PN25, Core derived from flange wall thickness, Bolt configuration upgrade, However, the high gear selection can effectively avoid the late leakage fault, Comprehensive use costs are lower.
American Standard Class pressure system is mostly used for foreign trade projects, high-end high-pressure equipment, and is suitable for high-precision industrial conditions.Class150 normal temperature pressure 1.96MPa, standard PN20, suitable for medium and low pressure chemical equipment;Class300 pressure 5.07MPa, Class400 pressure 6.84MPa, suitable for medium and high pressure, ultra-high pressure chemical reaction scenarios;Class600, Class900, Class1500 and other high-grade flanges, suitable for high-pressure gas, supercritical and other special conditions.European standards must be strictly distinguished when selecting models, American Standard System, Avoid mismatching pressure parameters caused by standard confusion, Affect the sealing stability of equipment.
temperature isTitanium flangeKey parameters that are easy to ignore, Flange pressure capacity will continue to decay under high temperature conditions, Must stack degradation factor check.20℃ normal temperature conditionTitanium flangeRated pressure values can be achieved, The pressure drop at 100℃ is 0.88 times of the original parameter, 200℃ degradation factor 0.70, 300℃ high temperature environment degradation coefficient is only 0.58, At 400℃, the pressure bearing capacity is only 45% of the rated value.Many selection errors stem from ignoring temperature degradation, For example, 300 ° C, 4.0MPa high temperature and high pressure working condition, Pressure of conventional PN40 flange after degradation is only 2.3MPa, Unable to meet production needs, PN63 flange upgrade required, After degradation, the pressure can be adjusted to 3.6MPa before it can adapt to the working condition., Temperature and pressure must be checked simultaneously.
For the five mainstream industrial conditions, it can accurately match the correspondingTitanium flangePressure rating.Under low pressure water and ventilation light load conditions, PN6 and PN10 low pressure flanges are selected to give consideration to practicality and cost performance;Medium pressure steam, condensing medium conditions, preferably PN16, PN25 or Class150 flange;High pressure chemical reaction equipment, core adaptation PN40, Class300 specifications;In the production scenarios of ammonia and urea, PN63, PN100 or Class400/600 high pressure grade shall be selected;High temperature and high pressure combined working conditions, vacuum equipment, Type selection shall be combined with temperature degradation coefficient, With custom seal construction, Ensure long-term stable operation of equipment.
Standardized five-step selection process can fully avoid the problem of selection deviation.The first step is to verify the actual operating pressure of the equipment, and to reserve a safety margin for the first gear in the selection priority;The second step is to confirm the working temperature and check the pressure degradation coefficient against the industry standard;The third step is to judge the corrosion intensity of the medium, and match TA10 corrosion resistant titanium material under strong corrosion conditions;The fourth step is to unify the equipment implementation standards and distinguish between European standard PN or American standard Class system;The fifth step is to match the bolts of corresponding specifications, ensure that the number and strength of bolts meet the standard, and adapt the flange pressure grade.
Relying on Baoji Titanium Valley landing project for many years, multiple groups of real cases intuitively reflect the wrong selection and optimization scheme.Item Misuse PN16 Flange Fit 200℃, 2.5MPa steam condition, Short-term operation means leakage, Long term stable operation of equipment after replacing PN40 flangePart of high temperature and high pressure equipment single use PN40 flange, Ignoring the effect of degradation at 350℃, Leakage caused by insufficient pressure, Upgrade PN100 flange to completely solve hidden dangersThere are also cases where PN40 flanges are over-selected for low-pressure conditions, Waste of procurement costs, Replacement of PN10 flange meets the requirements.At the same time, mixed standards, low bolt grade, improper gasket fit are common causes of flange seal failure.
Summarize five key points of high frequency selection to avoid pits, adapt to daily procurement and design work of the factory.First, put an end to only check the pressure ignoring the temperature check, temperature and pressure parameters must be synchronized verification;The second is to unify the equipment implementation standards, Avoiding the problem of mixing PN and Class standards, Verification MTC Report Standard ParametersThird, high-pressure flange matching high-strength bolts, PN40 specifications need to be matched with 8.8 bolts to prevent bolt fracture;Fourth, adhere to reasonable margin selection to avoid hidden dangers under low price and low allocation;Fifth, matching special gaskets, high-pressure conditions select metal winding gaskets to prevent gasket breakdown leakage.
Deep cultivation of Baoji China titanium valley, Shaanxi 100 billion Tuoda focusTitanium non-standard equipmentCustomized with titanium accessories, can provide exclusive supporting services for chemical enterprises.Free one-to-one working condition type selection check, according to pressure, temperature, The dielectric parameters accurately match the flange grade and complete the degradation checkFull pressure grade titanium flange stock, covering the whole series of European standard, American standard specifications;Free review of MTC material report, verification of standard number, pressure rating and material parameter compliance.Technical consultation: 15909236031 / 0917-3557966, official website: www.sxqytd.com
The core of titanium flange precise selection lies in pressure matching, temperature degradation check, Accessories Matching, Scientific selection can effectively avoid seal leakage, Equipment failure and production hidden trouble.This article is compiled according to GB/T 9112-2010, HG/T 20592-2009, ASME B16.5-2020 and other public industry standards, updated on August 8, 2026.
disclaimerTitanium flange pressure rating parameters, Selection scheme for technical reference only, The actual use effect is affected by the working environment, installation technology, Accessory Impact, The final selection plan shall be subject to written confirmation by both parties.
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