Pipe Flanges to BS4504 (now superseded by BS EN 1092-1:2007) are a widely used European standard for flanged pipe connections, commonly found in water, gas, chemical, and industrial pipeline systems. These flanges are pressure rated as PN10, PN16, and PN40, representing their ability to handle working pressures up to 10, 16, or 40 bar, respectively. They are designed for use with metric-sized pipework and are compatible with gaskets and bolting arrangements defined under the same standard.

Key features and benefits of Pipe Flanges BS4504 (BS EN 1092-1 2007) PN10/16 and 40.

Key Features

BS4504 flanges (now EN 1092-1:2007) follow metric dimensions and are widely accepted across the UK and Europe. This ensures compatibility with a broad range of international piping systems and components.

Key Features

Offered in PN10, PN16, and PN40 classifications, these flanges cater to low, medium, and high-pressure applications. They provide engineers with flexible options based on system demands.

Key Features

Slip-on, weld neck, blind, threaded, and lap joint options are all available. This supports both welded and non-welded connections depending on the installation requirements.

Key Features

Manufactured with flat face, raised face, or tongue-and-groove sealing options. These features help create consistent, leak-tight joints with the correct gaskets.

Key Features

Available in carbon steel, stainless steel, and ductile iron for a range of media and environmental conditions. This includes chemical resistance, temperature variation, and outdoor durability.

Key Features

Conforms to strict dimensional, material, and pressure specifications. Ensures global compliance and easy integration with other certified components and systems.

These flanges are essential because they provide a standardised, globally recognised connection method for metric piping systems. The EN 1092-1:2007 standard ensures dimensional consistency, pressure classification, and reliable sealing performance, which are critical in maintaining safe and efficient pipeline operation. Their widespread adoption across Europe and the UK means they are a go-to choice for engineers needing dependable, easy-to-source flanged joints. Whether dealing with potable water, compressed air, or high-pressure steam, these flanges provide a strong, secure connection that stands up to both physical and environmental stress.

BS4504/EN 1092-1 flanges are used extensively in water treatment plants, heating systems, oil and gas infrastructure, food processing facilities, chemical pipelines, and general industrial systems. They are found in both above-ground and buried installations where metric pipe sizes and European compliance are required. PN10 and PN16 are common in utility and HVAC services, while PN40 is often selected for higher-pressure process and steam applications. Whether installed in public infrastructure, a chemical dosing plant, or an energy facility, these flanges offer the standardisation, strength, and reliability needed in modern pipework.

Industries

Pipeline fittings are used to connect straight sections of pipe, change flow direction, adapt pipe sizes, or terminate a piping system. They’re essential for building efficient, flexible, and safe fluid or gas transport networks.

A fitting joins pipes together or modifies flow (e.g., elbows, tees, reducers), while a flange is a flat disc used to bolt two pipe sections or components together. Flanges allow for easier disassembly and maintenance.

They are commonly made from stainless steel, carbon steel, brass, copper, or plastic depending on the application. Stainless steel and carbon steel are preferred for industrial, high-pressure, or high-temperature systems.

Standard pressure ratings include 150lb, 300lb, 600lb, and higher depending on the material and design. The correct pressure class must match your system requirements to ensure safe operation.

ANSI B16.5 is a standard that defines dimensions, tolerances, and pressure ratings for pipe flanges and flanged fittings. It is widely used in industrial and high-pressure piping systems.

It is not recommended unless proper adapters are used. Mixing standards can result in misalignment, poor sealing, or mechanical failure.

Selection depends on factors such as pressure, temperature, fluid type, pipe size, and applicable standards. Material compatibility and environmental conditions should also be considered.

No. For hygienic applications, only stainless steel fittings with smooth, crevice-free surfaces (often polished) and specific certifications (e.g., 3A, FDA) should be used.

Typical fittings include elbows, tees, reducers, caps, nipples, couplings, and unions. Each serves a unique function in controlling direction, flow, or connectivity.

Common types include weld neck, slip-on, blind, threaded, socket weld, and lap joint flanges. Each type serves a different installation or operational need.

Yes, provided they are rated for the appropriate pressure and temperature conditions. Materials like carbon steel or stainless steel are suitable for steam lines.

Yes, many suppliers (including us) can provide custom-machined or hard-to-source parts for specific projects. Get in touch with our team to discuss your requirements.

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Pipe Flanges BS4504 (BS EN 1092-1 2007) PN10/16 and 40