Mặt bích là thành phần thiết yếu trong hệ thống đường ống, cung cấp một cách an toàn và đáng tin cậy để kết nối đường ống, van, và thiết bị. Trong số nhiều loại mặt bích có sẵn, cái mặt bích khớp nối stands out for its unique design and versatility. It is commonly used in industries where frequent disassembly, căn chỉnh, or inspection of pipelines is necessary.

This article provides detailed knowledge of a lap joint flange, including its structure, những lợi ích, ứng dụng, and comparison with other flange types.

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Mặt bích chung là gì?

A lap joint flange is a two-part assembly consisting of a phần cuối sơ khai và một mặt bích ủng hộ. The pipe is butt-welded to the stub end, while the lap joint flange is free to rotate around it. This design allows for easy alignment during installation and maintenance.

Các tính năng chính:

• The flange does not contact the fluid directly; only the stub end does.

• The flange is not welded or fixed permanently, allowing for free rotation.

• Suitable for low-pressure applications and non-critical service.

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Structure of a Lap Joint Flange

1. Kết thúc sơ khai:

   • Welded to the pipe.

   • Made of corrosion-resistant material if the medium is aggressive.

   • Comes in short or long patterns depending on design requirements.

2. Backing Flange (Loose Flange):

   • Slips over the stub end.

   • Provides the bolting surface for connection.

   • Usually made of carbon steel to reduce cost, even if the stub end is stainless steel or alloy.

This dual-component design makes lap joint flanges economical and versatile.

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Advantages of a Lap Joint Flange

• Dễ dàng căn chỉnh: Since the flange rotates freely, it is easier to align bolt holes during installation.

• Tiết kiệm chi phí: Only the stub end needs to be made from expensive corrosion-resistant materials, while the backing flange can be made of cheaper materials.

• Khả năng tái sử dụng: Backing flanges can be reused multiple times with different stub ends.

• Tính linh hoạt: Ideal for systems that require frequent dismantling for cleaning or inspection.

• Reduced Maintenance Time: Simplifies assembly and disassembly, minimizing downtime.

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Disadvantages of a Lap Joint Flange

• Lower Pressure Rating: Generally limited to low- and moderate-pressure applications.

• Bulkier Design: Two-piece construction may require more space.

• Not Suitable for High-Stress Applications: Less strength compared to weld neck or socket weld flanges.

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Applications of Lap Joint Flanges

1. Công nghiệp hóa chất và hóa dầu

Pipelines transporting corrosive chemicals often use lap joint flanges with stainless steel stub ends and carbon steel backing flanges to balance performance and cost.

2. Công nghiệp thực phẩm và đồ uống

Easy disassembly is important for cleaning and sterilization of pipelines. Lap joint flanges meet hygiene requirements while simplifying maintenance.

3. Marine and Offshore Applications

Lap joint flanges are used in seawater systems where corrosion resistance is necessary, but cost needs to be controlled.

4. Công nghiệp dược phẩm

Frequent inspection and cleaning make lap joint flanges an excellent choice for sanitary piping.

5. Nhà máy xử lý nước

Cost-effective connections for large-diameter, đường ống áp suất thấp.

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Mặt bích Lập vs. Other Flanges