Flanges according to EN standard

Flanges according to EN standard are precision‑manufactured pipe flanges made to European norms (most commonly EN 1092‑1) for joining pipes, valves and equipment in pressure systems. In our shop you will find flanges produced only in stainless, acid‑resistant and heat‑resistant steels — suitable where corrosion resistance, hygiene or high temperature performance is required. These EN standard flanges are designed for reliable sealing, repeatable assembly and compatibility with European pipe dimensions (DN) and pressure classes (PN).

What are EN standard flanges and how are they used?

A flange is a rim, collar or plate attached to the end of a pipe, valve or fitting to enable bolting to a matching flange and creating a pressure‑tight joint. EN standard flanges follow uniform dimensions and bolt patterns so parts from different manufacturers fit together. Typical flange connection types include:

• Weld neck (butt‑weld) — good for high stress and repeated service;
• Slip‑on — economical, easy to install;
• Blind — for closing pipe ends or access points;
• Threaded — for low‑pressure or small diameter assemblies;
• Socket weld and lap‑joint — for specific piping arrangements.

EN flanges are specified by nominal diameter (DN), pressure rating (PN, e.g. PN10, PN16, PN25) and facing type (e.g. raised face, flat face, ring joint). They are commonly called pipe flanges, industrial flanges or European standard flanges — all useful search terms when selecting parts.

Materials: stainless, acid‑resistant and heat‑resistant steels

We supply flanges only in stainless and corrosion‑resistant steels. Common material grades and their widely used markings include:

• 304 stainless — (EN 1.4301 / AISI 304): general purpose austenitic stainless steel with good corrosion resistance and formability;
• 316 and 316L stainless — (EN 1.4401 / EN 1.4404, AISI 316 / 316L): better corrosion resistance than 304, widely used in chemical, food and marine environments;
• Duplex stainless — (EN 1.4462 / UNS S32205): higher strength and improved resistance to chloride stress corrosion cracking;
• Ferritic stainless (e.g. 430) — (EN 1.4016 / AISI 430): magnetic, good oxidation resistance at moderate temperatures;
• Heat‑resistant stainless grades — such as AISI 310 and similar alloys used where elevated temperatures are present.

These descriptions use both colloquial names (stainless steel, acid‑resistant steel, heat‑resistant steel) and technical designations (EN, AISI/ASTM or UNS) so you can match material requirements specified by engineers, fabricators or standards documents.

Industries and typical applications

EN standard flanges in stainless and corrosion‑resistant steels are used across a wide range of sectors. Typical applications include:

• Oil and gas, petrochemical and offshore piping;
• Water and wastewater treatment and utilities;
• Food, beverage, brewing and pharmaceutical processing (hygienic piping and tanks);
• Power generation and heating systems (boilers, heat exchangers);
• Construction, HVAC and building services;
• Automotive, small fabrication shops and even garage‑level projects that require corrosion resistance.

Whether you are an engineer specifying components for a plant, a contractor fitting a commercial system or a hobbyist building a corrosion‑resistant installation, EN flanges offer standardised dimensions and a wide material choice to suit the task.

Standards, compatibility and international equivalents

EN flanges are produced to European standards (EN 1092‑1 is the common reference for steel flanges). For projects that cross borders, EN flanges are often compared with or adapted to international standards such as ASME/ANSI B16.5 (common in the United States) or national British standards. When choosing flanges, check nominal diameter (DN), pressure class (PN) and bolt‑hole pattern for compatibility. If you need cross‑reference help between EN and ASME standards, our technical notes and sales team can assist.

How to choose the right EN standard flange

Key factors to consider when selecting flanges for your system:

• Material — select a stainless grade based on corrosion environment (chlorides, acids), temperature and mechanical load;
• Pressure rating (PN) — ensure the flange PN matches system pressure and safety margins (PN10, PN16, PN25, PN40 etc.);
• Connection type — weld neck for high loads, slip‑on for economy, blind for end caps;
• Facing — raised face, flat face or ring joint depending on gasket type and sealing needs;
• Dimensional compatibility — match DN and bolt pattern to mating flanges, valves or equipment.

If you are unsure which grade or class to order, provide the intended media, temperature range, nominal pipe size and operating pressure — we can recommend appropriate EN flanges for your application.

If you need help selecting flange dimensions, materials or standards compliance for a UK or international project, contact our technical team — we will help match the right EN standard flange to your requirements.