Spade Flange

What is Spade Flange

A Spade Flange, also called Spade Blind, Paddle Blind, or Line Blind, is a solid metal plate used to block pipeline flow.

Unlike a spectacle blind flange, which has one blind side and one open ring side connected together, a spade flange is only the solid blind plate part. It is installed between two flanges when the pipeline needs complete isolation.

Spade flanges are commonly used with a spacer ring. When the pipeline needs to operate normally, the spacer ring is installed. When the pipeline needs to be closed, the spacer ring is removed and replaced with the spade flange.

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Spade Flange Specifications

Additional Specifications:

• Type: Spade flange, spade blind, paddle blind, line blind
• Structure: Solid blind plate with handle or paddle extension
• Face Type: Raised face, flat face, ring joint face, customized sealing face
• Installation: Installed between two standard pipe flanges
• Custom Service: Special OD, thickness, handle length, bolt holes, marking, coating available

Spade Flange Materials & Grades

Spade flanges can be supplied in different materials according to working pressure, temperature, pipeline medium, corrosion environment, and project standard.

Carbon steel spade flanges are widely used in oil and gas, refinery, power generation, and general industrial pipelines. Stainless steel spade flanges are suitable for chemical processing, marine systems, and corrosive media. Alloy steel and duplex steel materials are available for high-pressure, high-temperature, or special service conditions.

Spade Flange Dimensions

Spade Flange Dimension Drawing

Spade flanges can be manufactured according to ASME B16.48 standard dimensions or customer drawings. Key dimensions include outside diameter, thickness, blind plate diameter, bolt circle diameter, bolt hole diameter, sealing face, handle length, and handle width.

Advantages of Spade Flange

Positive Pipeline Isolation

The solid blind plate provides complete shutoff for maintenance, inspection, pressure testing, or process shutdown.

Simple Structure

Compared with spectacle blind flanges, spade flanges have a simpler single-plate design and are easy to manufacture and install.

Reliable Sealing Performance

Accurate machining and proper sealing face treatment help reduce leakage risk between flanged joints.

Used with Spacer Ring

Spade flanges are commonly used together with spacer rings, allowing pipeline systems to switch between blocked and open conditions.

Multiple Standard Options

Products can be manufactured according to ASME B16.48, ASME B16.5, ASME B16.47, EN, DIN, JIS, and custom drawings.

Wide Material Selection

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

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Applications

Oil and Gas Pipelines

Used for complete isolation in crude oil, natural gas, refinery, and offshore pipeline systems.

Petrochemical Plants

Suitable for process line isolation during maintenance, shutdown, pressure testing, and safety inspection.

Chemical Processing

Stainless steel and alloy spade flanges are used for corrosive and hazardous chemical media.

Power Generation

Applied in steam, cooling water, fuel gas, and auxiliary pipeline systems.

Refinery Systems

Used in high-pressure and high-temperature pipeline sections requiring safe flow shutoff.

Marine and Shipbuilding

Suitable for ship pipeline systems, fuel lines, seawater lines, and process piping.

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Why Choose Us

Comprehensive Manufacturing Capability

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

International Standards Compliance

Our products meet ASME B16.48, ASME B16.5, ASME B16.47, EN, DIN, JIS, and customer drawing requirements.

Customized Production Support

We can manufacture spade flanges with customized thickness, OD, bolt holes, sealing face, handle length, handle width, and material.

Strict Quality Inspection

Each batch is inspected for material grade, dimensions, thickness, bolt hole accuracy, surface finish, sealing face, and appearance.

Wide Material Options

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

Export Packaging Support

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

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FAQ

Q: What is a Spade Flange?

A: A spade flange is a solid plate-type pipeline isolation component installed between two flanges to completely block pipeline flow.

Q: What is the difference between Spade Flange and Spectacle Blind Flange?

A: A spectacle blind flange has one solid blind side and one open ring side connected together, while a spade flange is only the solid blind plate. It is usually used together with a spacer ring.

Q: What standard is commonly used?

A: ASME B16.48 is commonly used for spade flanges and line blinds. ASME B16.5, ASME B16.47, EN, DIN, JIS, and custom drawings can also be supplied.

Q: Can Spade Flange be customized?

A: Yes. OD, thickness, bolt holes, sealing face, handle length, handle width, material, coating, and marking can be customized.

Q: Where are Spade Flanges commonly used?

A: They are commonly used in oil and gas, petrochemical, chemical processing, refinery, power generation, marine, and industrial pipeline systems.

Contact Us

Ready to enhance your pipeline safety with premium Spade Flange solutions? Contact kevin.zhao@hkflange.com for technical specifications and competitive quotations today.

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