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As a China factory focused on quality engineering, Longan forged socket weld flange is designed for critical industrial systems requiring reliable sealing and structural durability. Manufactured with advanced forging, ERP-controlled production, and precision surface processing, it offers strong thermal stability, reduced stress concentration, and dependable performance for vacuum, petrochemical, and ultra-clean gas applications.
Longan forged socket weld flange is engineered for industrial systems where sealing integrity, pressure stability, thermal resistance, and operational safety are critical. It is widely applied in petrochemical processing, offshore oil transportation, power generation plants, semiconductor gas delivery systems, aerospace fuel pipelines, hydrogen energy projects, and vacuum equipment requiring high structural precision.
For industries operating under continuous pressure fluctuation, vibration, or extreme temperatures, connection reliability directly affects production continuity and maintenance costs. Longan focuses on delivering stable performance through precision forging, advanced machining, and strict process control.
The product is especially suitable for applications requiring low leakage rates, high sealing contact accuracy, and long-term durability in harsh environments.
| Industry Sector | Common Usage | Operational Requirement |
| Oil & Gas | High-pressure transport pipelines | Corrosion resistance and leak prevention |
| Petrochemical | Chemical processing systems | Stable sealing under thermal cycling |
| Power Generation | Steam and energy pipelines | Long-term structural reliability |
| Semiconductor | Ultra-clean gas delivery | Particle and contamination reduction |
| Aerospace | Cryogenic fuel systems | Extreme temperature sealing stability |
| Fusion Energy | Vacuum reactor systems | Ultra-low leakage performance |
Traditional welding methods often generate excessive heat concentration, increasing the risk of material deformation, corrosion sensitivity, and long-term sealing instability.
Longan improves connection stability through optimized socket structure and controlled thermal influence during installation. Compared with conventional TIG welding heat input above 120J/mm, the optimized process can reduce heat input to approximately 28J/mm.
The heat affected zone can also be controlled to around 80μm compared with traditional processes exceeding 500μm. Lower thermal influence helps preserve material properties and improve operational reliability under demanding conditions.
| Welding Factor | Conventional Process | Longan Technology |
| Heat input | High thermal concentration | Reduced thermal influence |
| Heat affected zone | Over 500μm | Approximately 80μm |
| Corrosion resistance stability | Standard level | Enhanced long-term durability |
| Structural deformation risk | Higher | Reduced significantly |
Pipeline systems operating under repeated temperature changes may experience displacement, stress accumulation, and vibration transfer. These factors can gradually reduce sealing performance and increase maintenance frequency.
Longan utilizes a multi-surface stress dispersion structure to reduce localized stress concentration during operation. Under temperature fluctuation conditions of ΔT=300℃, thermal displacement compensation can decrease from approximately 0.3mm to 0.008mm.
Assembly stress can also be reduced from around 78MPa to 6MPa, helping improve connection reliability in high-temperature and high-vibration systems.
The structure is especially effective in energy facilities, steam transport systems, and precision gas delivery pipelines requiring stable long-term operation.
Sealing surface precision directly influences leakage control, cleanliness standards, and operational safety. Longan applies refined machining and advanced polishing processes to achieve highly consistent sealing surfaces.
The forged socket weld flange reaches approximately Ra 0.05μm surface roughness through mirror polishing and precision shaping technologies. Real sealing contact rates can exceed 99.6%, significantly higher than many conventional products.
Helium leakage rates can be controlled to ≤10⁻¹¹ mbar·L/s, supporting demanding vacuum applications and ultra-high purity industrial systems.
| Sealing Feature | Performance Benefit |
| Mirror-level polishing | Improved sealing consistency |
| High contact surface ratio | Reduced leakage possibility |
| Ultra-low helium leakage | Suitable for vacuum systems |
| Low adsorption energy | Reduced contamination attachment |
| Precision-machined interface | Long-term operational stability |
Modern semiconductor and precision manufacturing facilities require strict control over particles, gas purity, and metal ion contamination. Even microscopic contamination can affect production efficiency and equipment stability.
In advanced wafer fabrication gas pipeline applications using 316L EP grade materials, particle release performance can decrease from over 5,000 pieces/m³·h to below 20 pieces/m³·h, supporting ISO Class 1 cleanliness requirements.
Inspection efficiency is also improved significantly. Helium inspection time can be reduced from approximately 4 hours per joint to around 8 minutes, improving maintenance efficiency and reducing downtime pressure.
Lower contamination defects contribute to more stable production environments for precision manufacturing systems.
Industrial systems operating under cryogenic temperatures, ultra-high vacuum, or high neutron environments require stable structural performance beyond conventional standards.
| Application Environment | Conventional Limitation | Longan Solution |
| Ultra-high purity silane systems | Higher metal ion precipitation | Extremely low contamination level |
| Liquid hydrogen pipelines | Thermal shrinkage leakage | Stable low-temperature sealing |
| Fusion reactor vacuum systems | Higher tritium permeability | Enhanced vacuum integrity |
| High vibration equipment | Stress concentration | Improved structural stability |
For liquid hydrogen systems operating near -253℃, the product maintains stable sealing capability under severe thermal contraction conditions. In high vacuum environments, ultra-low leakage performance supports continuous and reliable operation.
The forged socket weld flange is also suitable for advanced energy systems where leakage control and structural consistency are essential for operational safety.
Longan utilizes an advanced ERP-based manufacturing management system covering raw material tracking, forging, machining, inspection, testing, and final shipment.
The paperless workflow improves process traceability, production accuracy, and operational consistency throughout every manufacturing stage. Digital quality management helps ensure stable dimensional precision and compliance with industrial standards.
With complete in-house manufacturing capability, Longan maintains tighter production control while supporting large-scale industrial projects requiring dependable delivery performance.
Longan specializes in manufacturing industrial flanges up to 4 meters in diameter for heavy-duty infrastructure and large-capacity pipeline systems.
Stainless steel materials are commonly utilized, while special alloy materials can also be selected according to operating environment and engineering requirements.
OEM support is available for customized non-standard designs, including special dimensions, sealing structures, and project-specific technical requirements.
| Manufacturing Capability | Support Details |
| Large-diameter production | Up to 4 meters |
| Material options | Stainless steel and special materials |
| OEM manufacturing | Customized non-standard products |
| Production lead time | Approximately 2 to 4 weeks |
| Packaging solutions | Wooden crates and reinforced cartons |
Packaging methods are selected according to product dimensions, weight, and transportation requirements to maintain surface integrity and structural protection during delivery.
Large and heavy products are packed using reinforced wooden crates, while smaller components are protected using durable cartons. Transportation options include truck and marine shipment arrangements based on project needs.
Longan combines precision forging capability, advanced sealing technology, and strict manufacturing management to support demanding industrial systems requiring dependable long-term operation.
- Large-scale flange manufacturing capability
- Full in-house forging and machining processes
- Reduced heat affected welding structure
- Ultra-low leakage sealing performance
- High sealing surface precision
- Stable operation under vibration and thermal cycling
- Suitable for vacuum and ultra-high purity systems
- ERP-based digital quality traceability
- OEM support for customized engineering requirements
- Compliance with international industrial standards
For industries requiring reliable sealing performance, stable structural strength, and advanced contamination control, Longan forged socket weld flange provides an efficient and dependable solution engineered for modern industrial challenges.
Longan continues to focus on precision manufacturing, process consistency, and advanced engineering support for critical pipeline systems worldwide.
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NO. 620, MINGZHU ROAD, YONGXING STREET, LONGWAN DISTRICT, WENZHOU CITY, ZHEJIANG PROVINCE, CHINA.
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