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Compared with conventional ASME B16.5 flanges, Longan's flat flange asme b16.5 has the following core advantages:
● Bending strength increased by 65%: The bionic honeycomb structure provides a higher section modulus, greatly enhancing load-bearing capacity at the same weight.
● Ultimate pressure bearing breakthrough: The core technology lies in the built-in titanium alloy reinforcement ring in the flange neck, with a yield strength of 1,250MPa. Measured data are as follows:
1. Cyclic fatigue life: Traditional flange can withstand 5,000 cycles at 25MPa, while Longan's product can withstand 20,000 cycles at 35MPa, a 300% increase in cycle life.
2. Axial deformation (35MPa): Traditional flange deformation is 1.8mm, while Longan's product is only 0.6mm, a 67% reduction.
3. Burst pressure (DN300): Longan's product reaches 42MPa, while traditional flange is ≤15MPa, an 180% improvement.
● Off-load sealing reliability: Under eccentric load conditions with a 15° pipeline misalignment, the sealing leakage rate is ≤10⁻⁵ mbar·L/s (traditional flange >10⁻³). The radial reinforcement rib design on the back of the flange reduces local stress concentration by 48%, and the bionic honeycomb structure resists warping deformation. In the ISO 10816-3 standard 50-200Hz frequency band vibration test, the amplitude attenuation rate reaches 92%.
● Intelligent warning and anti-loosening: The sealing surface is embedded with a nano-zirconia wear indicator layer, which changes color visibly when the thickness is less than 0.1mm. The double-conical bolt hole design controls preload attenuation under 35MPa pressure fluctuation to ≤5% (traditional structure ≥20%).
● Extreme environment adaptability: -70°C impact of 89J, 5,000-meter deep-sea corrosion of 0.03mm/year, sand and dust abrasion ≤8μm.
Choosing Longan's flat flange asme b16.5, you will obtain the following irreplaceable values:
1. Factory direct sales, cost controllable: Longan's in-house factory controls the entire process from raw materials to finished products, with no middleman markup. The 30-year total life cycle cost is reduced by 66% compared to traditional flanges (from $18,500 to $6,200).
2. International authoritative certification: It has passed API 6A PSL 3G certification, meeting the stringent requirements of ultra-high pressure gas media in shale gas and deep-sea drilling.
3. Customization services: Support for non-standard sizes, special pressure ratings, private labeling, with flexible minimum order quantity - one piece minimum order.
4. Fast delivery and after-sales: Standard size products in stock are shipped within 3 working days; custom products have a lead time of 15-30 days. Free samples (sample fee refundable) and third-party witnessed testing services are provided.
5. Real data endorsement: All performance data (42MPa, 89J, 0.03mm/year, etc.) come from factory tests, and customers can witness on-site testing.
6. Global project verification: The product has been running long-term and stably in projects such as Middle East shale gas fields, South China Sea deep-sea platforms, and Russian Arctic pipelines.
| Performance indicator | Test conditions/standard | Measured value | Compliance status |
|---|---|---|---|
| Burst pressure (DN300) | Hydrostatic burst | 42MPa | Exceeds national standard ≤15MPa, compliant |
| Cyclic fatigue life | 35MPa pressure cycle | 20,000 cycles | Exceeds traditional flange (5,000 cycles @25MPa) |
| Axial deformation | Under 35MPa pressure | 0.6mm | Better than traditional flange 1.8mm |
| Sealing leakage rate | 15° misalignment condition | ≤10⁻⁵ mbar·L/s | Better than traditional >10⁻³ |
| Amplitude attenuation rate | 50-200Hz, ISO 10816-3 | 92% | Effective vibration suppression |
| Preload attenuation | 35MPa pressure fluctuation | ≤5% | Better than traditional ≥20% |
| Low-temperature impact toughness | -70°C, GB/T 229-2020 | 89J | Exceeds national standard ≥34J |
| Deep-sea corrosion rate | 5,000m, 30-year equivalent, ASTM G111-97 | 0.03mm/year | Meets deep-sea engineering requirements |
| Sand and dust abrasion depth | 120m/s, 10,000h, ISO 5890:2012 | ≤8μm | Meets desert/offshore platform requirements |
Based on the ASME B16.5 standard system, Longan's flat flange asme b16.5 can be widely used in the following industrial fields:
● Shale gas fracturing pump system: Working pressure 35-70MPa with severe pressure pulsation. The product has a cyclic fatigue life of 20,000 cycles (at 35MPa) and leakage rate ≤10⁻⁵, meeting the safety requirements of thousands of pressure cycles at well sites.
● Deep-sea oil and gas drilling and production platforms: At 5,000m water depth, external hydrostatic pressure is about 50MPa,叠加 with internal oil and gas pressure. The 30-year equivalent corrosion rate of 0.03mm/year ensures no replacement needed throughout the full life cycle.
● Polar LNG transmission pipelines: Ambient temperature as low as -70°C, product impact toughness of 89J, far exceeding the Arctic engineering standard (≥27J), ensuring low-temperature brittle fracture risk is可控.
● Offshore oil field Christmas tree and blowout preventer stack: API 6A PSL 3G certified, suitable for ultra-high pressure scenarios with gas media, sealing reliability meets the minimum leakage requirements of API 16A for BOP control lines.
● Ultra-high pressure chemical reactor connections: Suitable for piping systems within pressure rating Class 1500, the built-in titanium alloy reinforcement ring in the flange neck provides an additional safety margin.
| Environmental condition | Measured data | Test standard |
|---|---|---|
| Low-temperature impact (-70°C) | 89J (national standard ≥34J) | GB/T 229-2020 |
| Deep-sea corrosion (5,000m) | 0.03mm/year (30-year equivalent) | ASTM G111-97 |
| Sand and dust abrasion (120m/s) | ≤8μm (10,000 hours) | ISO 5890:2012 |
These data show that the product can operate stably for long periods in polar pipelines (-70°C), deep-sea engineering (5,000m water depth), and desert high-speed sand-laden environments.
Longan adopts the following three process innovations to ensure high product performance:
● Gradient quenched high-carbon steel: By precisely controlling the heating and cooling rates, a gradual hardness distribution from high-hardness surface to high-toughness core is formed, avoiding the cracking risk of traditional full quenching.
● Bionic honeycomb structure: Finite element analysis verifies that the bending strength is 65% higher than a solid flange of the same weight.
● Built-in titanium alloy reinforcement ring: Ti-6Al-4V ring with yield strength of 1,250MPa and density only 60% of steel.
Quality control key points:
1. Raw material incoming inspection: spectral analysis, mechanical property sampling, raw materials from Tsingshan Holding Group.
2. Process control: real-time monitoring of heat treatment furnace temperature curves, automatic recording of gradient quenching parameters.
3. Finished product inspection: 100% dimensional inspection, 10% magnetic particle testing, batch sampling for burst pressure.
4. Third-party witnessing: On-site witness testing by SGS, BV, or other agencies can be arranged upon request.
Each flat flange asme b16.5 comes with traceable material certificates, heat treatment curve records, dimensional inspection reports, and hydrostatic/pneumatic test reports. International buyers can check production progress and test data online using the order number.
Q: What is the difference between this and a conventional ASME B16.5 flange?
A: Both follow the dimensional requirements of the ASME B16.5 standard; the difference lies in the sealing face type. Conventional ASME B16.5 flanges mostly use a raised face (RF) design, while flat flange uses a full-face (FF) design. The sealing surface of a full-face flange is completely flat extending to the bolt hole edges and must be used with a full-face gasket. Longan's product adds three core technologies on this basis: bionic honeycomb structure, gradient quenching, and built-in titanium alloy reinforcement ring.
Q: What pressure ratings is it suitable for?
A: According to the ASME B16.5 standard, this product covers pressure ratings from Class 150 to Class 1500. Actual application shows that the DN300 size achieves a burst pressure of 42MPa, far exceeding the ASME B16.5 standard requirements for the same size flange. It is particularly suitable for ultra-high pressure scenarios such as shale gas fracturing pumps and deep-sea drilling platforms.
Q: How is the corrosion resistance in offshore platform applications?
A: In the ASTM G111-97 standard test simulating a 5,000m deep-sea environment, the 30-year equivalent corrosion rate is only 0.03mm/year. The gradient quenched high-carbon steel material combined with the bionic honeycomb structure maintains good corrosion resistance in deep-sea high-salt-fog, high-pressure environments.
Q: How does Longan ensure product quality?
A: Longan has an in-house factory and implements full-process quality management from raw material selection to finished product inspection. It has passed API 6A PSL 3G certification. The company is located in Longwan, Wenzhou, leveraging the stable raw material supply of Tsingshan Holding Group and its own strong forging and machining capabilities to establish a complete production and quality inspection system. International buyers can send requirements to obtain free samples for verification.
Q: Can free samples be provided?
A: Yes, international buyers can send technical requirements to the sales team to obtain free samples (sample fee refundable, freight borne by the buyer). For first-time cooperating customers, Longan provides third-party inspection agency witnessing test services to verify product performance meets requirements before arranging shipment.
Summary: Longan's flat flange asme b16.5 strictly follows the ASME B16.5 international standard while achieving comprehensive breakthroughs of +65% bending strength, 42MPa burst pressure, 20,000 cycles fatigue life, ≤10⁻⁵ leakage rate, and 66% reduction in total life cycle cost through the three core technologies: bionic honeycomb structure, gradient quenching process, and built-in titanium alloy reinforcement ring. The API 6A PSL 3G certification and extreme environment verification data make it an ideal flange choice for shale gas extraction, deep-sea drilling, and ultra-high pressure pipeline systems. Send your requirements to obtain free samples and professional quotations.
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