China Steel Flat Flange
About Longan
Flanges Factory

Longan is the professional of the Socket Flange, Flat Flange, 304 Welding Flange manufacturer and supplier in china. You can rest assured to buy the products from our factory and we will offer you the quality after-sale service.

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  • 0+ High Precision Machining Centers

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about

Wenzhou Longan Flange Co., Ltd. 

We specialize in manufacturing industrial flanges up to 4 meters in diameter, meeting the demands of heavy-duty applications in oil & gas, petrochemical, power generation, and large infrastructure projects. With full in-house capabilities—from forging to machining and testing—we ensure dimensional precision, structural integrity, and international standard compliance.

The company utilizes an advanced online ERP system, providing complete network coverage in the workshop. Adopting paperless production, it ensures accurate data from raw material entry to finished product dispatch. The system facilitates quality control at every stage, utilizing digital processes for effective management and ensuring each production step meets required standards. Our philosophy centers on customer success and employee well-being for the long-term stability and development of the enterprise, guiding us in providing high-quality products and excellent services for domestic pipeline projects.

If There Are Problems, The Company Provides Dedicated After-sales Service
Customer First, Service First
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Advantages of Flanges

Lap-joint flanges have several advantages, making themselves the best choice in many situations.
Exceptional Reliability
Lap joint flanges securely connect two pipes or fittings, effectively preventing system leaks and ensuring high connection reliability.
Easy Maintenance
Lap joint flanges securely connect two pipes or fittings, effectively preventing system leaks and ensuring high connection reliability.
Low Installation Costs
Lap joint flanges have relatively low manufacturing and installation costs, which are manageable, helping to reduce overall project costs.
Cost Savings
When pipe materials are unique and expensive, using lower-grade flange materials while maintaining the same pipe material can achieve material cost savings.
Easy Installation
Lap joint flanges simplify construction by easing bolt hole alignment during assembly and accommodating future changes during equipment replacements.

Featured Products

Applications

Tank Components
Tank Components
Chemical Pipelines
Chemical Pipelines
Medical Cleanrooms
Medical Cleanrooms
Photovoltaic New Energy
Photovoltaic New Energy
Automotive Parts
Automotive Parts
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