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Welding Flange
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Welding Flange

Customized Welding Flanges have a +40% pressure bearing capacity compared to ordinary flanges, and Longan's products have passed ASME and ISO certification, and the quality is very reliable! "DN600-DN3000 large welded flanges, measured leakage rate ≤0.001%, SGS material report and customized thickness +30% anti-deformation can be provided, come and get a free practical solution"

Product Features

1. Super strong sealing reliability:

Fatigue life comparison: After 10⁷ cycles, the crack growth rate of Welding Flanges forgings is 63% lower than that of cast flanges

Through helium mass spectrometry detection: 2500PSI level leakage rate <10⁻⁶ mbar·L/s, much less than the industry average of 10⁻⁴.

Burst pressure redundancy: The measured burst value of ordinary flanges is ≥150PSI, while the measured burst value of 150PSI flanges is ≥600PSI

2. Authoritative certification

With multiple certifications such as ISO 9001, ASME B16.5, PED 2014/68/EU

Summary of third-party test report: TÜV Rheinland: Deformation of sealing surface after 100,000 pressure cycles <8μm

SGS-MT-2025-XXXX: Charpy impact energy 42J@-46℃ (required ≥27J)

3. Anti-extreme working condition solution

Corrosive environment life extended to 15 years+

Special solution for offshore platforms: 316L ultra-low carbon stainless steel: pitting equivalent PREN≥38, while standard 316L is 26, nearly 1.5 times.

Coating system: The Welding Flanges passed ISO12944 C5-M 2500h salt spray test, 300μm FBE+500μm PU.

High temperature and high pressure power station solution:

The difference between thermal expansion coefficient and P91 pipeline is ≤1.5×10⁻⁶/℃, reducing thermal stress cracks

SA-182 F91 material: ordinary carbon steel is only 65MPa, and high temperature yield strength is ≥220MPa@600℃

Come and input: your medium temperature/pressure/pipe diameter and other parameters

We will output:

1. Minimum thickness calculation value

2. Recommended welding flange material grade

3. Bolt load verification report

Get the following engineering files for free:

Downloadable gasket selection matrix for different media

Downloadable high pressure flange installation torque guide (PDF)

No need to wait any longer, come and contact us!

Welding Flange



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