Reducing Flange

What is Reducing Flange

A Reducing Flange is a special flange used to connect a larger pipe to a smaller pipe directly. Unlike standard flanges with the same bore size as the pipeline, reducing flanges have a reduced inner bore to match the smaller pipe diameter.

This design can replace a standard flange plus reducer combination, helping reduce installation space, welding work, material cost, and total pipeline weight.

Reducing flanges are especially useful in pipeline systems where flow direction changes from a large pipe size to a smaller pipe size, or where equipment nozzles and pipeline diameters are different.

Image Position 2: Main products Banner
图片建议：放一张横幅图，标题为 MAIN PRODUCTS，下面展示 Reducing Flange、Weld Neck Flange、Blind Flange、Slip On Flange、Plate Flange 等产品。
图片标题：Main Flange Products

Reducing Flange Specifications

Additional Specifications:

• Face Types: Raised Face (RF), Flat Face (FF), MFM, TG, Ring Type Joint (RJ)
• Bore Type: Reduced bore, stepped bore, customized bore
• Connection Method: Bolted connection with welding pipe end
• Surface Finish: 125-250 μin Ra for sealing surfaces
• Custom Service: Special bore size, special thickness, special drilling available

Reducing Flange Materials & Grades

Reducing flanges are available in a wide range of materials. The material should be selected according to pipeline medium, working pressure, temperature, corrosion environment, and project standard.

Carbon steel reducing flanges are commonly used in oil and gas, water treatment, construction, and general industrial systems. Stainless steel reducing flanges are suitable for chemical, food, pharmaceutical, and corrosive environments. Alloy steel and duplex materials can be used for high-temperature, high-pressure, or special working conditions.

Reducing Flange Dimensions

reducing-flange-dimension-drawing

Reducing flanges can be manufactured according to standard dimensions or customer drawings. Key dimensions include outside diameter, flange thickness, reduced bore size, bolt circle diameter, bolt hole diameter, number of bolt holes, and sealing face type.

Advantages of Reducing Flange

Compact Pipeline Connection

Reducing flanges connect different pipe sizes directly, reducing the need for additional reducer fittings.

Lower Installation Cost

Compared with using a standard flange plus reducer, reducing flanges can reduce welding work, material cost, and installation time.

Space-Saving Design

The compact structure is suitable for equipment connections or pipeline systems with limited installation space.

Flexible Bore Customization

The bore can be customized according to pipe size, wall thickness, and project requirements.

Wide Standard Compatibility

Reducing flanges can be produced according to ASME, EN, DIN, JIS, GOST, and custom drawings.

Reliable Sealing Performance

Accurate machining and suitable sealing face treatment help ensure stable flange connection performance.

Image Position 4: Workshop Image
图片建议：放工厂车间、锻造、热处理、机加工、钻孔、包装照片拼图。
图片标题：Reducing Flange Workshop

Applications

Oil and Gas Industry

Used for pipeline size transition in oil transmission, gas pipelines, refinery systems, and offshore platforms.

Petrochemical Plants

Suitable for process pipelines where different pipe diameters need to be connected safely and efficiently.

Power Generation

Used in steam, cooling water, and auxiliary pipeline systems.

Chemical Processing

Stainless steel and alloy reducing flanges are suitable for corrosive media and special working conditions.

Water Treatment

Used in pump stations, water supply systems, drainage pipelines, and treatment facilities.

Industrial Equipment Connection

Suitable for connecting equipment nozzles, valves, pumps, and pipelines with different diameters.

Image Position 5: Application Scenarios
图片建议：放油气管道、化工厂、发电厂、水处理厂、工业设备连接场景。
图片标题：Reducing Flange Application Scenarios

Why Choose Us

Comprehensive Manufacturing Capability

We coordinate forging, heat treatment, machining, drilling, inspection, coating, and packaging under one production system.

Custom Bore Processing

We can manufacture reducing flanges with customized bore sizes, stepped bores, special thicknesses, and non-standard drilling patterns.

International Standards Compliance

Our products meet ASME, EN, DIN, JIS, GOST, and customer drawing requirements.

Wide Material Options

Carbon steel, stainless steel, alloy steel, duplex steel, nickel alloy, copper alloy, and titanium materials are available.

Strict Quality Inspection

Each batch is inspected for material grade, dimensions, bore accuracy, bolt hole alignment, sealing surface, and appearance.

Export Packaging Support

Anti-rust treatment, wooden case packaging, and customized marking are available for international shipment.

Image Position 6: Certificates
图片建议：放 SGS、ISO、TUV、PED 等证书图。
图片标题：Reducing Flange Certificates

FAQ

Q: What is a Reducing Flange?

A: A reducing flange is a flange used to connect pipes of different diameters. It has a reduced bore to match the smaller pipe size.

Q: Can Reducing Flange replace a reducer fitting?

A: In many pipeline designs, yes. It can replace a standard flange plus reducer combination, saving space and installation cost.

Q: What standards are available?

A: Reducing flanges can be supplied according to ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, GOST, and custom drawings.

Q: What materials can be used?

A: Common materials include carbon steel, stainless steel, alloy steel, duplex steel, nickel alloy, copper alloy, and titanium.

Q: Can the bore size be customized?

A: Yes. The reduced bore, stepped bore, thickness, drilling pattern, and sealing face can be customized according to project drawings.

Contact Us

Ready to enhance your piping systems with premium Weld Neck Flange solutions? Contact kevin.zhao@hkflange.com for technical specifications and competitive quotations today.