Trong thế giới đường ống công nghiệp, các giải pháp hiệu quả và tiết kiệm chi phí là rất cần thiết—đặc biệt là trong các hệ thống có điều kiện áp suất và nhiệt độ vừa phải. Trong số các tùy chọn mặt bích khác nhau, cái flat welding flange (also known as a slip-on flange) stands out as a practical and economical choice for low-pressure pipeline systems.

This article explores the advantages, technical features, ứng dụng, installation methods, and material options of flat welding flanges. Whether you’re a pipeline contractor, engineer, or procurement specialist, this guide will help you understand why flat welding flanges are a popular option in industries such as water treatment, HVAC, hóa dầu, and general construction.

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What Is a Flat Welding Flange?

MỘT flat welding flange is a type of pipe flange that slides over the pipe and is then fillet welded on both the inside and outside to provide strength and leak-tightness. Không giống như mặt bích cổ hàn, flat welding flanges do not have a hub and are ideal for applications where pressure is relatively low and where space and budget constraints matter.

Standard references include:

• ASME B16.5 – For pipe flanges and flanged fittings

• EN 1092-1 Kiểu 01 hoặc 02 – For European specifications

• JIS B2220 – For Japanese standard flanges

sasa thuôn dài manufactures flat welding flanges in a variety of sizes and materials to meet international standards and project specifications.

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Design Features of Flat Welding Flanges

• Kích thước lỗ khoan: Slightly larger than the pipe outer diameter to allow easy insertion

• Mặt ngước lên (RF) or flat face (FF): Options depending on sealing needs

• No long tapered hub: Compact and lightweight

• Fillet welds: Applied on both sides to secure the pipe

• Lỗ bu lông: Equally spaced to match standard bolt patterns

The simple geometry and easy alignment make flat welding flanges suitable for quick assembly, Sửa chữa, and field modifications.

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Advantages of Flat Welding Flanges

1. Cost-Effective Solution

Flat welding flanges are more affordable than weld neck flanges due to:

• Less material used

• Easier machining

• Faster installation time

• Lower welding complexity

This makes them ideal for budget-sensitive projects and large-scale piping networks.

2. Easy Installation and Alignment

These flanges are easier to align with pipes during welding. Của họ slip-on design accommodates minor misalignment and allows quick positioning.

• Saves labor time

• Reduces risk of installation errors

• No need for complex beveling as with butt-weld connections

3. Lightweight and Space-Saving

The absence of a hub reduces the overall weight and space requirement, making them suitable for:

• Compact equipment layouts

• Lightweight supports

• Skid-mounted systems

4. Versatility in Applications

Flat welding flanges can be used for:

• Fluids (Nước, không khí, dầu)

• Low-pressure steam

• Non-hazardous gases

• Non-corrosive liquids

They are common in non-critical systems that don’t require high structural strength.

5. Wide Availability and Customization

Flat welding flanges are widely produced and available in:

• Các lớp áp lực: 150#, 300#, PN10, PN16

• Kích cỡ: DN15 đến DN2000

• Các loại đối mặt: RF, FF, and RTJ

• Nguyên vật liệu: Thép cacbon, thép không gỉ, thép hợp kim

sasa thuôn dài offers quick delivery of standard and customized flat welding flanges for global projects.

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Typical Applications of Flat Welding Flanges

● Water Supply and Drainage

Used in municipal pipelines, trạm bơm, and wastewater treatment plants due to corrosion-resistant coatings and simple connections.

● Hệ thống HVAC

Flat welding flanges are ideal for air conditioning and heating pipelines, offering quick on-site adjustments and tight seals.

● Nhà máy hóa chất và hóa dầu

Applied in non-critical service pipelines carrying mild chemicals, dung môi, or low-pressure steam.

● Chế biến thực phẩm và đồ uống

When made from stainless steel, flat welding flanges are used in hygienic piping for beverages, dairy, and brewing.

● Power Plants and Energy Facilities

Applied in auxiliary systems such as cooling water, low-pressure return lines, and drainage networks.

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Installation Procedure

Installing a flat welding flange requires the following steps:

1. Chuẩn bị đường ống

   • Cut the pipe to the required length

   • Clean the pipe end to remove oil, bụi bẩn, or burrs

2. Flange Placement

   • Slide the flange over the pipe end

   • Align the bolt holes with mating flange or template

3. Hàn

   • Perform a fillet weld on the inner side of the pipe end

   • Follow with an outer fillet weld around the flange face

4. Gasket Insertion and Bolt Tightening

   • Place the gasket (vết thương xoắn ốc, cao su, vân vân.)

   • Insert bolts and tighten in a cross-pattern using a torque wrench

   • Follow appropriate torque sequence to ensure uniform pressure

5. Kiểm tra và kiểm tra

   • Conduct hydrostatic or pneumatic testing to check for leaks

   • Visually inspect welds for quality and completeness

sasa thuôn dài supplies flanges with precision machining, making installation smooth and consistent.

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Tùy chọn vật liệu

Flat welding flanges are manufactured in a variety of materials, bao gồm:

• Thép cacbon (ASTM A105, EN P245GH): Affordable and strong for general use

• thép không gỉ (304, 316, 321): Corrosion-resistant for chemical and food applications

• Thép hợp kim (F11, F22): Used in moderate temperature and pressure environments

• Thép không gỉ song công: Offers superior strength and corrosion resistance

• Hợp kim niken: For specialized systems requiring chemical resistance

Surface treatments may include:

• Galvanizing

• Epoxy coating

• Sự thụ động

• Pickling and polishing

sasa thuôn dài offers material traceability, EN10204 3.1 giấy chứng nhận, and special coatings upon request.

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Pressure Ratings and Standards

Flat welding flanges are designed for low to moderate pressure applications:

• ASME B16.5 Classes: 150#, 300#

• EN 1092-1 Lớp áp lực: PN6, PN10, PN16

• JIS B2220 Classes: 5K, 10K, 16K

Always select the correct pressure class and material based on system pressure, nhiệt độ, và loại chất lỏng.

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Inspection and Quality Control

To ensure safety and performance, all flat welding flanges must undergo:

• Kiểm tra kích thước

• Xác minh vật liệu (PMI)

• Flatness and facing finish check (Ra ≤ 3.2 ừm)

• Căn chỉnh lỗ bu lông

• Visual inspection of welds (if factory-welded)

• Hydro or air leak testing if assembled

sasa thuôn dài duy trì ISO 9001-certified quality systems and third-party inspection cooperation (SGS, BV, TUV).

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Tại sao chọn sasaflange?

sasa thuôn dài is a professional flange manufacturer serving global customers in energy, hóa dầu, Nước, và các dự án cơ sở hạ tầng. Ưu điểm chính bao gồm:

• Full range of flat welding flanges in ASME, EN, DIN, JIS, and GOST standards

• Manufacturing in stainless steel, thép cacbon, và hợp kim đặc biệt

• gia công CNC, surface finishing, and drilling

• 3.1/3.2 certified quality control and fast export support

• Custom sizes, lớp phủ, and gasket kits available

For budget-conscious projects or low-pressure pipelines, sasa thuôn dài delivers reliable flanged solutions with fast turnaround.

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Phần kết luận

Flat welding flanges are a smart and economical solution for low-pressure pipeline systems across a wide range of industries. Their ease of installation, hiệu quả chi phí, and flexibility make them ideal for non-critical yet essential piping applications.

By sourcing high-quality flat welding flanges from sasa thuôn dài, customers benefit from certified materials, international compliance, and expert support—ensuring the success of every pipeline project.

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