EN10216-5 stainless steel seamless tubes are widely used in pressure vessels, water supply piping systems, and other pressure-bearing industrial tube projects. These European-standard stainless steel tubes and their matching fittings are one of our company’s main product lines.

Recently, we successfully completed and delivered a batch of EN10216-5 stainless steel seamless tubes for a Singapore regular customer. This batch of tubes will be used in a municipal water supply system project in Singapore.

The material is 1.4301 (SS304), designed with a fixed length of 6 meters, and wall thicknesses ranging from 2 to 3 mm, placing them in the category of high-precision, thin-wall seamless steel tubes.

Purchase List

The wall thickness of this order is only 2-3 mm, which qualifies as thin-wall tube. In accordance with standard engineering practice and customer requirements, the tube ends are supplied with a Plain End (PE) finish, without Bevel End (BE) machining. This ensures the flatness of the stainless steel tube ends and avoids the risk of damage that beveling might cause to thin-wall pipes.

PE (Plain End): The pipe end is cut square to the axis with no angled surface. Commonly used for socket-welding, threaded connections, or as preparation for on-site beveling before butt welding.

BE (Beveled End): The pipe end is machined with an angled surface (typically 30°-37.5°) for butt-welding to ensure full weld penetration.

EN10216-5 Stainless Steel Seamless Tubes

In the field of pressure equipment and industrial piping systems, EN10216-5 standard stainless steel seamless tubes are a core material choice in Europe and global markets, thanks to their excellent performance and strict technical specifications. This article provides a comprehensive overview of this European-standard product, covering its standard system, material comparisons, and application scope.

EN10216-5 Standard Scope

EN10216-5 is a standard established by the European Committee for Standardization, forming part of the “Seamless steel tubes for pressure purposes” series, and specifically addresses stainless steel seamless tubes.

This document specifies the technical delivery conditions in two test categories for seamless tubes of a circular cross section made of austenitic (including creep resisting steel) and austenitic-ferritic stainless steel which are intended for pressure and corrosion resisting purposes at room temperature, at low temperatures or at elevated temperatures.

This standard is mandatory within the EU and the European Free Trade Association. It serves as the core technical basis for ensuring the safety of pressure equipment such as boilers, pressure vessels, and piping systems, and its requirements comply with the EU Pressure Equipment Directive (PED 2014/68/EU).

Normative References

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN 10020:2000, Definition and classification of grades of steel

EN 10021:2006, General technical delivery conditions for steel products

EN 10027-1:2016, Designation systems for steels – Part 1: Steel names

EN 10027-2:2015, Designation systems for steels – Part 2: Numerical system

EN 10028-7:2016, Flat products made of steels for pressure purposes – Part 7: Stainless steels

EN 10088-1:2014, Stainless steels – Part 1: List of stainless steels

EN 10168:2004, Steel products – Inspection documents – List of information and description

EN 10204:2004, Metallic products – Types of inspection documents

EN 10266:2003, Steel tubes, fittings and structural hollow sections – Symbols and definitions of terms for use in product standards

CEN/TR 10261:2018, Iron and steel – European standards for the determination of chemical composition

Marking to Be Applied

Depending on the size of the tubes, the following marking shall either be applied on a label attached to the bundle or the box of tubes, or be marked indelibly on each tube at least at one end.

The marking shall include the following information:

manufacturer’s name or trade mark;

dimension of the tubes;

number of this part of EN 10216 and the steel name (or number) (see 5.2);

cast number or a code number;

test category;

mark of the inspection representative;

identification number (e.g. order or item number) which permits the correlation of the product or delivery unit to the related document;

and at the discretion of the manufacturer:

symbol identifying the delivery condition (see Table 1).

Example of marking:

A Note on Product Naming: Seamless Pipe vs. Seamless Tube

In our daily operations, we pay close attention to a practical detail regarding product identification. While customers often specify the product name as “Seamless Pipe” in their purchase orders, the formal designation under the EN 10216-5 standard is “Seamless Tube”.

This difference is not a matter of quality or performance, but rather a reflection of industry terminology across different application contexts. “Pipe” tends to emphasize the engineering function of conveying fluids within piping systems, while “Tube” highlights the precision of cross-sectional dimensions and standardized manufacturing attributes.

As a professional stainless steel tube supplier, we remain firmly customer-oriented. Based on a thorough understanding of both standard requirements and customer preferences, we adopt a flexible marking approach: we strictly follow the customer’s specified marking on the product, while ensuring that every tube we deliver fully complies with all technical specifications and quality requirements of EN 10216-5.

This means that regardless of the marking choice, every single tube we deliver delivers the same excellent quality, rigorous traceability, and comprehensive EN 10204 inspection documentation. We bridge the subtle gap between standard language and customer language in a professional manner, providing our clients with a truly reliable and hassle-free delivery experience.

Material Comparison: The Relationship Between 1.4301 and SS304

1.4301 and SS304 are essentially the same material, named differently due to different standard systems. Understanding this is key to understanding the relationship between European and American standard materials.

1.4301: The numeric designation in European Standards (EN). Its corresponding steel grade is X5CrNi18-10, which is an austenitic stainless steel.

Chemical Composition

Mechanical Properties

SS304: The common designation in ASTM standards (UNS S30400) from the United States. It is one of the most widely used stainless steels globally.

Chemical Composition

Mechanical Properties

Correspondence: The chemical compositions of the two are essentially identical – chromium content 18%-20%, nickel content 8%-10.5%, the classic “18/8” stainless steel. The corresponding grade in the Japanese JIS standard is SUS304, and in the Chinese GB standard, it is 06Cr19Ni10 (formerly 0Cr18Ni9).

Key Characteristics: 1.4301/SS304 offers good corrosion resistance, excellent formability, and weldability, maintaining stable mechanical properties over a wide temperature range from -250°C to 550°C. It is important to note that this material is sensitive to chloride ions. In coastal environments or applications with high chloride exposure, upgrading to molybdenum-containing grades like 1.4401/316 or 1.4404/316L should be considered.

Application Scope of EN10216-5 Stainless Steel Seamless Pipes

As a specialized material for pressure equipment, EN10216-5 stainless steel seamless tubes arewidely used in the following industrial sectors:

The EN10216-5 standard represents a high level of technical achievement for stainless steel seamless tubes used in European pressure equipment. As a core grade within this standard system, 1.4301 (SS304) plays an irreplaceable role worldwide across industries like petrochemicals, energy, food and pharmaceuticals, and municipal engineering due to its excellent comprehensive performance.

For thin-wall pipe applications requiring a balance of pressure resistance, corrosion resistance, and precision dimensions, this European-standard product offers a reliable technical solution.

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ASME standards are the most widely used specifications for piping components in oil, gas, petrochemical, power generation, and industrial projects. Proper and clear marking is essential for product identification, material traceability, installation accuracy, and workplace safety. Different types of piping products follow different marking rules based on their respective ASME standards.

This article covers the key marking requirements for four major categories: steel pipes (ASME B36.10 & B36.19), flanges (ASME B16.5), butt-weld fittings (ASME B16.9), and forged fittings (ASME B16.11). All these standards follow the general marking principles defined in MSS SP-25.

About MSS SP-25 – General Marking Regulation

MSS SP-25 is the universal standard marking system for valves, flanges, fittings, and unions used in industrial piping systems. Published by the Manufacturers Standardization Society (MSS), this standard defines consistent rules for marking content, location, method, and durability. It is widely referenced by major ASME standards, including ASME B16.5, B16.9, and B16.11.

The main purpose of MSS SP-25 is to ensure clear product identification, material traceability, pressure rating recognition, and safe installation. It specifies mandatory items such as manufacturer identification, material grade, size, pressure class, standard number, and heat number.

In short, MSS SP-25 serves as the common foundation for marking all ASME B16 series piping products.

ASME B36.10 & B36.19 – Marking for Steel Pipes

ASME B36.10M (for carbon steel pipes) and ASME B36.19M (for stainless steel pipes) are dimensional standards. They only define outer diameter, wall thickness, tolerance, length, and bevel requirements. These two standards do NOT include any marking requirements.

Marking for steel pipes must follow the applicable material specification, such as:

• ASTM A53, ASTM A106, API 5L for carbon steel
• ASTM A312, ASTM A213 for stainless steel

Typical marking:

• Manufacturer’s logo or trademark  (Optional)
• Product Name
• Pipe Type (seamless or welded)
• Size
• Length
• Material grade
• Standard
• Heat number

For example: PIPE SMLS 1/2″ X 6MTR ASTM A106 GR.B SCH STD ASME B36.10 ZZ2570

ASME B16.5 – Flange Marking

ASME B16.5 is the standard for pipe flanges and flanged fittings. It includes clear and detailed marking requirements, based on MSS SP-25.

Typical marking contents:

• Manufacturer’s trademark (Optional)
• Flange Name
• Nominal size
• Pressure class
• Hub Thickness (for weld neck flange)
• Sealing Face
• Material
• Standard
• Heat number (mandatory for cast steel flanges)

Sequence of the marking do not have strict regulation.

For example: SHZC 4″ #2500 SCH40 RTJ WN FLANGE ASTM A350 LF2 ASME B16.5 ZZ0440

ASME B16.9 – Marking for Butt Weld Fittings

ASME B16.9 covers factory-made butt-weld fittings, including elbows, tees, reducers, and caps. Its marking requirements follow MSS SP-25.

Typical marking examples:

• Manufacturer’s identification mark (Optional)
• Fitting Name
• Fitting Type (seamless or welded)
• Material grade
• Nominal size
• Standard
• Heat number

A complete marking shows like: 90DEG LR SMLS 3IN SCH80 ASTM A234 WPB ASME B16.9 ZZ0188

ASME B16.11 – Forged Steel Fittings Marking

ASME B16.11 applies to socket-weld and threaded forged steel fittings. Marking rules are clearly defined and based on MSS SP-25.

Typical marking examples:

• Manufacturer’s mark (Optional)
• Fitting Name
• Fitting Type (SW or THD)
• Material
• Pressure rating
• Nominal size
• Standard
• Heat number

Such as: 90DEG DN20 3000# BSPT ASTM A105 ASME B16.11 ZZ0250

Conclusion

Understanding marking requirements for ASME B16 and B36 series products helps ensure correct material selection, quality control, and site compliance.

• ASME B36.10/B36.19 pipes: No marking requirements — follow material standards.
• ASME B16.5 flanges, B16.9 butt-weld fittings, B16.11 forged fittings: Follow their own standards plus MSS SP-25.

Correct marking improves traceability, reduces installation errors, and supports long-term reliability in industrial piping systems.

In short, we generally follow the formula below:

Manufacturer’s mark+Name+Type+Size+Material+Standard+Heat Number

Some parts of the marking contents can be deleted when the marking space is limited. And sequence of the marking do not have strict regulation. But below 5 parts cannot be omitted anytime.

Mandatory content: Type+Size+Material+Heat Number

Custom markings are also commonly applied as agreed with customers.

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ASME B18.2.1-2012 is the latest active version of the standard for inch-series bolts and screws. It specifies dimensions, tolerances, terminology, and quality requirements for a wide range of imperial fasteners used in mechanical engineering, manufacturing, assembly, and industrial projects worldwide.

Compared with the widely used ASME B18.2.1-2010 edition, this 2012 version provides clearer definitions, expanded product coverage, and improved structural standard separation.

What’s New in ASME B18.2.1-2012?

ASME B18.2.1-2012 introduces several key updates and additions compared to the 2010 edition, as confirmed by the official standard’s table of contents:

New Fastener Types Added 

The 2012 edition expands the scope to include three new fastener categories that were not covered in the 2010 version:

• Askew Head Bolts (Table 4)
• Hex Flange Screws (Table 8)
• Lobed Head Screws (Table 9)

These additions provide comprehensive specifications for modern fastening applications not addressed in the previous edition.

Structural Bolts Relocation

Notably, heavy hex structural bolts have been completely removed from ASME B18.2.12012. These fasteners are now specified exclusively under ASME B18.2.6, the dedicated standard for structural applications, eliminating confusion between general-purpose and structural fasteners.

Enhanced Technical Specifications

The standard now includes detailed new sections for critical design parameters:

• Maximum and Minimum Length Limitations for Short Screws Threaded Full Length (Table 11)
• Maximum Grip Gaging Lengths, L_G, and Minimum Body Lengths, L_B, for Screws Except Flange Head (Table 12)

These additions support larger-diameter applications and provide clearer guidance for engineers and manufacturers.

Improved Formatting and Definitions

All tables, notes, and technical definitions have been revised in accordance with ASME B18.12.1, ensuring consistency and readability. Lag screw threads have also been redefined to align with other fastening standards.

Products Covered by ASME B18.2.1-2012

Based on the official table of contents, ASME B18.2.1-2012 covers the following inch-series fasteners:

• Square Head Bolts (Table 1)
• Hex Bolts (Table 2)
• Heavy Hex Bolts (Table 3)
• Askew Head Bolts (Table 4)
• Hex Cap Screws (Table 6)
• Heavy Hex Cap Screws (Table 7)
• Hex Flange Screws (Table 8)
• Lobed Head Screws (Table 9)
• Square Lag Screws (Table 14)
• Hex Lag Screws (Table 15)
• Lag Screw Threads (Table 16)

Important Note: This standard does not cover heavy hex structural bolts, which are now governed by ASME B18.2.6.

Download ASME B18.2.1-2010 & ASME B18.2.1-2012

For reference, you may also review details of the previous widely used edition:

https://www.zzsteels.com/knowledge/asme-b18.2.1-2010.pdf

For the latest specifications, you can access the full document of the active edition:

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What is EN 1092-1 Loose Plate Flange Type 04?

EN 1092-1 Type 04 is a loose plate flange designed for use with a Type 34 weld-neck collar. It is a non-welded, rotatable flange plate that fits around the weld-neck collar and provides easy bolt hole alignment during installation.

This flange does not contact the conveying medium directly, as the sealing and pressure resistance are provided by the matching weld-neck collar. Type 04 is widely used in European piping systems for corrosion-resistant lines, easy assembly, and frequent maintenance scenarios.

Design Features of Type 04 Loose Plate Flange

Type 04 loose plate flange has clear and practical structural characteristics.

• Loose and rotatable design for easy bolt hole alignment
• No welding required on the flange itself
• Works only with Type 34 weld-neck collar
• Flat and simple plate structure
• Reduces installation difficulty and on-site labor time
• Protects expensive alloy or stainless steel pipes
• Standard dimensions ensure interchangeability
• Suitable for medium-pressure piping systems

The rotatable feature is especially useful in large-bore or restricted installation spaces.

How Loose Plate Flange Works with Type 34 Weld-Neck Collar

EN 1092-1 Type 04 loose plate flange must be used together with Type 34 weld-neck collar. The Type 04 flange plate is placed over the pipe first, and then the Type 34 weld-neck collar is welded to the pipe end.

The loose flange can rotate freely to align bolt holes easily during installation. The sealing surface is provided by the face of the Type 34 collar, while the Type 04 flange provides the clamping force. This combination is widely used for stainless steel and alloy pipelines to protect expensive piping materials and simplify assembly.

EN Approved Materials for Flange Type 04

Type 04 loose plate flanges are produced using common EN standard materials to meet industrial requirements.

Carbon steel materials

• S235JR
• P235GH
• P265GH

Stainless steel materials

• 1.4301 (304)
• 1.4401 (316)
• 1.4404 (316L)

Material selection depends on the application environment, including temperature, pressure, and corrosion level. The matching Type 34 collar is usually made of the same material as the pipeline.

Sealing Surface Options

Type 04 loose plate flanges support standard sealing faces in line with EN 1092-1.

• Raised Face (RF) – Most commonly used for general applications
• Flat Face (FF) – Used for low-pressure systems
• Other types available upon specific project requirements

Sealing performance depends on the matching gasket and the end face of the Type 34 weld-neck collar.

Where to Use Type 04 Loose Plate Flange?

EN 1092-1 Type 04 loose plate flanges are widely used in many industrial fields.

• Stainless steel and alloy piping systems
• Chemical and petrochemical processing lines
• Food, beverage, and pharmaceutical industries
• Water treatment and utility pipelines
• Corrosive medium applications
• Systems requiring frequent disassembly and maintenance
• Large-bore pipelines where alignment is difficult

Type 04 flanges are especially preferred where installation convenience and corrosion resistance are both required.

Contact Us

As a professional engineering manufacturer, Zizi Engineering Co Ltd offers full-process services—from cutting, forming, grinding to welding and assembly—help you shorten supply chains, cut costs, and boost project efficiency.

We welcome inquiries from project developers, contractors and enterprise clients to whom we will offer professional technical support and efficient manufacturing services. 

Look forward to being your reliable partner.

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When it comes to sealing and isolating industrial piping systems, precision, durability, and compliance with international standards are non-negotiable. The EN1092-1 Blind Flanges Type 05 stands out as a reliable solution, designed to meet the rigorous requirements of the European EN1092-1 standard for steel flanges. Whether you’re working in oil & gas, water treatment, chemical processing, or manufacturing, this blind flange delivers consistent performance, easy installation, and long-term reliability—making it the top choice for global engineers and procurement teams.

What is EN1092-1 Blind Flanges Type 05?

EN1092-1 standard defines the specifications for steel flanges used in piping systems, valves, and fittings across industries worldwide. Within this standard, Type 05 specifically refers to blind flanges—a specialized, hole-free disc-shaped flange designed to seal the end of a pipe, vessel, or valve.

Unlike other flanges used for pipe-to-pipe connection, EN1092-1 Type 05 blind flanges have no central bore. They are secured to the end of a piping system using bolts, creating a tight, leak-proof seal that prevents media leakage and protects the system from external contaminants. This design also simplifies future maintenance, expansion, and pressure testing of piping systems.

Specifications of EN1092-1 Blind Flanges

Compliance with EN1092-1 ensures uniform dimensions, material quality, and performance—critical for seamless compatibility with other EN1092-1 compliant flanges. Below are the core specifications that set our Type 05 blind flanges apart:

EN1092-1 Blind Flanges Pressure Ratings (PN)

Available in a full range of pressure ratings to suit diverse industrial applications, including PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, and PN100.

This versatility allows the flange to be used in low-pressure applications (e.g., municipal water systems) and high-pressure environments (e.g., oil pipelines and chemical reactors).

 Size Range (DN)

Covering nominal diameters from DN10 to DN4000 (custom sizes available upon request), our EN1092-1 blind flanges fit virtually any piping system—from small-scale workshop lines to large industrial pipelines.

The dimensions (flange outer diameter, bolt circle diameter, bolt hole size, and flange thickness) are strictly manufactured to EN1092-1 standards, ensuring perfect interchangeability with compatible flanges.

EN1092-1 Flanges Sealing Face Types

To accommodate different media, pressure, and temperature requirements, we offer multiple sealing face options—matching the standard’s most commonly used configurations:

• FF (Flat Face, Standard Code A): Ideal for low-pressure applications (PN≤16), paired with soft gaskets, and commonly used with cast iron or carbon steel flanges.
• RF (Raised Face, Standard Code B1/B2): The most versatile option, suitable for medium-low pressure (PN10–PN100) and compatible with most gasket types, making it the go-to choice for general industrial use.
• M/F (Male & Female) & T/G (Tongue & Groove): Designed for high-pressure systems, these paired sealing faces prevent gasket extrusion, ensuring reliable sealing for flammable, explosive, or toxic media.
• RJ (Ring Joint, Standard Code H): For extreme high-temperature and high-pressure conditions (e.g., PN63/100), using metal ring gaskets for superior leak resistance in harsh environments.

Material Options for EN1092-1 Blind Flanges

We use high-quality materials to ensure durability and corrosion resistance, tailored to your application’s needs:

• Carbon Steel: A105, ST37, S235JR, Q235, 16Mn (cost-effective for general industrial use).
• Stainless Steel: 304, 316, 321, 904L (resistant to corrosion, ideal for chemical, food, and marine applications).
• Alloy Steel: P91, P245GH (for high-temperature, high-pressure applications like power plants and oil refineries).

All materials undergo strict quality testing to meet EN1092-1 requirements, including chemical composition analysis and mechanical performance testing.

Surface Treatment

To enhance corrosion resistance and extend service life, we offer various surface treatments:

• Standard: Anti-rust black paint, transparent anti-rust oil, anti-rust varnish.
• Custom: Hot-dip galvanizing, sandblasting (for harsh environments like marine or chemical plants).

Why Choose EN1092-1 Type 05 Blind Flanges?

For global buyers and engineers, choosing EN1092-1 compliant Type 05 blind flanges means prioritizing safety, efficiency, and cost-effectiveness. Here’s what makes our product the best choice:

✅ Strict EN1092-1 Compliance

Every flange is manufactured and inspected to meet EN1092-1 standards, ensuring compatibility with European and global piping systems. This eliminates the risk of mismatched dimensions or subpar performance, saving you time and costs on replacements and repairs.

✅ Superior Sealing & Durability

Precision-machined sealing faces and high-quality materials ensure a leak-proof seal even in extreme conditions (high temperature, high pressure, corrosive media). The robust disc design reduces stress concentration, making the flange resistant to fatigue and wear—extending service life significantly.

✅ Easy Installation & Maintenance

The simple, lightweight design (compared to weld-neck flanges) allows for quick bolt-on installation—no complex welding required. When maintenance, inspection, or system expansion is needed, the blind flange can be easily removed, minimizing downtime and labor costs.

✅ Versatile Applications

EN1092-1 Type 05 blind flanges are used across virtually every industry, including:

• Oil & Gas: Pipeline isolation, pressure testing, and equipment sealing.
• Chemical Processing: Sealing corrosive media pipelines (paired with stainless steel or alloy materials).
• Water Treatment: Low-pressure piping system sealing for municipal or industrial water plants.
• Power Generation: High-temperature/high-pressure system isolation in thermal or nuclear power plants.
• Manufacturing: Workshop air compression pipelines, hydraulic systems, and equipment ports.

✅ Customization & Competitive Pricing

We offer custom sizes, materials, sealing faces, and surface treatments to meet your unique project needs. As manufacturer, we cut out middlemen to provide competitive pricing without compromising quality—ideal for bulk orders and long-term partnerships.

Conclusion

EN1092-1 Type 05 blind flanges are reliable end caps for piping systems, offering excellent sealing performance, high structural strength, and wide compatibility with European standard pipelines.

With various pressure ratings, sealing faces, and material options available, these flanges meet the demands of oil and gas, chemical, water treatment, power generation, and general industrial applications.

Our EN1092-1 flanges are manufactured in strict accordance with European standards, ensuring stable quality, precise dimensions, and long service life for your critical pipeline projects.

Contact Us

As a professional engineering manufacturer, Zizi Engineering Co Ltd offers integrated one-stop solutions, covering manufacturing, customization, and sales. 

Our full-process services—from cutting, forming, grinding to welding and assembly—help you shorten supply chains, cut costs, and boost project efficiency.

We welcome inquiries from project developers, contractors and enterprise clients to whom we will offer professional technical support and efficient manufacturing services. 

Look forward to being your reliable partner.

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Introduction of EN1092-1 Flange Sealing Face

EN1092-1 is the key European standard for steel flanges, covering nominal diameters DN10 to DN2000 and nominal pressure ratings PN6 to PN100. The sealing face design is one of the most important factors that affect sealing performance, gasket compatibility, assembly stability, and service life.

EN1092-1 standard defines eight standardized sealing face types: Type A, Type B, Type C, Type D, Type E, Type F, Type G, and Type H. Each type has a fixed structure, dimension, and matching rule. This article provides a complete and clear introduction to all eight EN1092-1 flange sealing face types for engineering, procurement, and industrial application.

What are EN1092-1 Flange Sealing Faces?

Flange sealing face is the contact area between two mating flanges and the gasket used to achieve a leak-tight joint. EN1092-1 specifies strict geometric dimensions, surface finish, machining tolerances, and pairing rules to ensure interchangeability between flanges from different manufacturers.

The eight official sealing face types are:

• Type A: Flat Face
• Type B: Raised Face
• Type C: Tongue
• Type D: Groove
• Type E: Spigot
• Type F: Recess
• Type G: Oring Spigot
• Type H: Oring Groove

Among them, Type A and Type B are single sealing faces used between identical faces. Types C/D, E/F, and G/H are paired designs that must be used together.

EN1092-1 Flange Sealing face: Type A – Flat Face

Type A is the Flat Face sealing face. The entire surface is flat and level with the bolting face of the flange, with no raised or recessed structure.

This type is mainly used in low-pressure systems such as PN6, PN10, and PN16. It requires full-face gaskets that cover the entire contact area. Type A is simple in structure, easy to machine and install, and widely used in water supply, air pipelines, and general utility services. It is not recommended for high pressure, fluctuating loads, or hazardous fluid services.

EN1092-1 Flange Sealing face: Type B – Raised Face

Type B is the Raised Face sealing face, the most widely used type in EN1092-1 flanges. It features a raised circular sealing area that concentrates gasket compression and improves sealing efficiency.

According to EN 1092-1, the standard facing height for Type B (Raised Face) is determined by nominal diameter (DN):

• 2 mm: ≤ DN 32
• 3 mm: DN 32 to DN 250
• 4 mm: DN 250 to DN 500
• 5 mm: DN 500

The surface is usually machined with a serrated finish to enhance gasket grip. It is compatible with spiral wound gaskets, graphite gaskets, non-asbestos gaskets, and PTFE gaskets.

Type B is suitable for medium to high-pressure systems and widely applied in oil and gas, chemical, power generation, process piping, and general industry.

EN1092-1 Flange Sealing face: Type C – Tongue

Type C is the Tongue face, which is always used together with Type D (Groove). It has a small, raised rectangular profile at the center of the sealing area.

This structure provides automatic centering and effectively prevents gasket extrusion or blow-out under pressure. Type C is typically used in critical applications such as refineries, chemical plants, and systems handling toxic, flammable, or high-pressure fluids.

EN1092-1 Flange Sealing face: Type D – Groove

Type D is the Groove face, which forms a Tongue and Groove pair with Type C. It has a recessed channel that matches the tongue of Type C.

The combination ensures high sealing stability and eliminates gasket displacement during assembly. Type D is widely used in high-integrity process lines where zero leakage is required.

Type E – Spigot

Type E is the Spigot face, used in combination with Type F (Recess). It has a cylindrical raised projection that helps align the flange during installation.

This type improves sealing stability under vibration and thermal cycling. It is commonly used in medium-pressure oil, gas, steam, and process piping systems.

Type F – Recess

Type F is the Recess face, which matches with Type E to form a Spigot and Recess assembly. It has a cylindrical recess that receives the spigot of Type E.

This pairing provides accurate self-alignment and reduces gasket side slip. It is widely used in industrial pipelines, mechanical equipment, and systems subject to vibration.

Type G – O-ring Spigot

Type G is the O-ring Spigot face, designed for use with Type H and elastomer O-rings. It has a special protruding profile that holds the O-ring in place.

This type provides reliable sealing with low assembly force and is widely used in gas systems, vacuum applications, instrumentation lines, and special fluid services.

Type H – O-ring Groove

Type H is the O-ring Groove face, which forms a pair with Type G for O-ring sealing. It has a precision-machined groove to accommodate the O-ring.

This design offers excellent sealing performance under varying pressure and temperature conditions. It is commonly used in special equipment, hydraulic systems, and process units requiring elastomer sealing.

Comparison of EN1092-1 Sealing Face Types

• Type A: Flat Face, low pressure, full-face gaskets, utility systems
• Type B: Raised Face, general-purpose, most widely used in industry
• Type C/D:Tongue and Groove, high tightness, critical and hazardous services
• Type E/F: Spigot and Recess, self-aligning, vibration-resistant applications
• Type G/H: O-ring Spigot and Groove, elastomer sealing, special services

All types comply with the dimensional and tolerance requirements of EN1092-1 standard.

Conclusion

EN1092-1 defines eight standardized sealing face types: Type A, B, C, D, E, F, G, H to meet the requirements of various industrial piping systems. Type A and Type B are the most common for general applications, while Type C/D, E/F, and G/H are professional paired designs for high-safety, vibration, and special sealing conditions.

Understanding the structure, characteristics, and applications of each type is essential for correct flange selection, proper gasket matching, and long-term, leak-free piping connections.

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What is EN1092-1 Slip-On Flanges?

EN1092-1 Slip-On Flanges (Type 01) are standardized steel pipe flanges, designed and manufactured in strict accordance with EN1092-1 European standard for wrought steel flanges and their joints. As a widely applied connection component in industrial piping systems, they are recognized for their cost-effectiveness, simplified installation process, and reliable sealing performance. Thus they are preferred choice for medium and low-pressure industrial applications across global markets.

Design Features of Type 01 Slip-On Flanges

The design specification of EN1092-1 Slip-On Flanges Type 01 is defined by the European Committee for Standardization (CEN), ensuring uniform dimensional tolerances, material requirements, and performance benchmarks.

Unlike weld neck flanges, Type 01 slip-on flanges feature a straightforward structure: the flange is slipped over the outer surface of the connecting pipe, then secured with fillet welds on both the inner and outer circumferences of the flange hub. This design reduces installation complexity, shortens construction time, and lowers welding requirements. Besides, it maintains sufficient structural integrity for standard industrial operating conditions.

Sealing Surface Options for EN1092-1 Flanges

The sealing surface of EN1092-1 Slip-On Flanges Type 01 follows EN1092-1 standard specifications, typically adopting a type A-flat face (FF) or type-B raised face (RF) design.

Type A: The flat face (FF) is suitable for low-pressure (PN≤10) and non-toxic media pipelines, ensuring simple sealing with standard gaskets.

Type B: The raised face (RF) is designed for medium-pressure (PN10-PN16) systems, providing enhanced sealing performance by increasing the contact pressure between the flange and gasket.

Both designs are compatible with EN-standard gaskets (non-asbestos, PTFE, graphite), effectively preventing media leakage and ensuring compliance with industrial safety requirements.

EN Approved Material for Flanges Type 01

Materials for EN1092-1 Slip-On Flanges comply with European material standards and EN1092-1 specification requirements, with carbon steel as the primary option for general industrial use. The core European material grades include EN 10025 S235JR, S275JR (carbon structural steel), EN 10213 C22.8 (carbon steel for pressure equipment), and EN 10222-2 P235GH, P265GH (pressure vessel carbon steel). For corrosive media environments (such as petrochemical and marine pipelines), stainless steel grades EN 1.4301 (304 equivalent), EN 1.4401 (316 equivalent) are available. Alloy steel grades (e.g., EN 1.7182) are optional for high-temperature, medium-pressure industrial systems, ensuring full compatibility with EN1092-1 standard requirements.

PN16 EN1092-1 Type 01 Slip-On Flanges Dimension

Quality Control for EN1092-1 Flange

Quality control of EN1092-1 Flanges is implemented throughout the manufacturing process, in strict accordance with EN1092-1 and relevant European industrial standards. All flanges undergo strict dimensional verification to ensure consistency with EN1092-1 standard tolerances; material composition analysis is conducted to confirm compliance with specified European steel grades; and pressure testing (hydrostatic testing or pneumatic testing) is performed to verify sealing performance and pressure-bearing capacity.

Additionally, surface treatment (such as hot-dip galvanizing, anti-rust painting, or pickling and passivation) is available to enhance corrosion resistance and extend the service life of the flanges.

Where to Use Type 01 Slip-On Flange?

EN1092-1 Type 01 Slip-On Flanges are widely applied in industrial sectors that adopt European standards, including oil and gas transmission, petrochemical processing, power generation (thermal power, hydropower), water treatment, chemical engineering, and general manufacturing. Their adaptability to medium and low-pressure systems, combined with cost-effectiveness and easy installation, makes them an indispensable component in modern European-standard industrial piping networks.

Summary

EN1092-1 Slip-On Flanges Type 01 adhere to EN1092-1 European standards, featuring standardized design, compliant European material grades, reliable performance, and wide application scope. Whether for standard specifications or custom requirements, these flanges provide a practical and economical piping connection solution, fully meeting the high standards of global industrial customers who adopt European piping systems.

Choose Us

As a professional engineering manufacturer, ZIZI Engineering Co Ltd offers integrated one-stop solutions, covering manufacturing, customization, and sales. Our full-process services—from cutting, forming, grinding to welding and assembly—help you shorten supply chains, cut costs, and boost project efficiency.

We welcome inquiries from project developers, contractors and enterprise clients to whom we will offer professional technical support and efficient manufacturing services. 

Look forward to being your reliable partner.

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EN1092-1 is the European standard for circular steel flanges, establishing uniform specifications for dimensions, pressure-temperature ratings, materials, and manufacturing requirements. It ensures interchangeability and safe performance across different manufacturers and countries. The standard covers various flange types, with pressure ratings from PN 2.5 to PN 400, and nominal diameters from DN 10 to DN 4000.

What is EN1092-1 Weld Neck (WN) Flange?

Weld Neck Flanges, designated as Type 11 in EN1092-1, feature a long tapered neck that is butt-welded directly to the pipe. This design creates a strong, integral connection that provides excellent stress distribution and fatigue resistance. Unlike slip-on or threaded flanges, WN flanges are specifically engineered for demanding applications involving high pressure, temperature extremes, or cyclic loading conditions.

EN1092-1 WN Flange Dimensions: Reference for DN80

For the commonly used DN80 (3-inch equivalent) size, here are the key dimensions across different pressure classes:

Note: For complete dimension tables (including pipe OD, sealing face diameter, and weights) across all PN classes up to PN 400, refer to the official EN10921 standard or contact our technical team with your specific DN/PN requirement.

Advantages of EN1092-1 WN Flanges

1. Superior Strength & Fatigue Resistance

The full-penetration weld between the neck and pipe creates a joint as strong as the pipe itself, ideal for cyclic loading and highpressure service.

2. Optimized Stress Distribution

The tapered hub smoothly guides stresses away from the weld zone into the flange ring, reducing peak stress concentrations and extending service life.

3. Reliable Sealing Performance

Compatible with Raised Face (RF), Flat Face (FF), and Ring-Type Joint (RTJ) sealing surfaces. When paired with suitable gaskets (e.g., spiral-wound or ring-joint gaskets), they ensure leak-tight integrity even under thermal cycling.

4. Full DN/PN Dimensional Compliance

Follows universal Nominal Diameter (DN) and Pressure Nominal (PN) sizing, enabling seamless connection with valves, pumps, and equipment from any ENcompliant supplier.

5. Ease of Inspection & NDT

The extended neck allows straightforward visual and nondestructive examination (NDT) of the weld, supporting quality assurance and predictive maintenance.

6. Broad Material & Pressure Range

Available in carbon steel, stainless steel, and alloy steel grades, with pressure ratings from PN 2.5 to PN 400, covering nearly all industrial pressure needs.

Potential Material Selection for EN1092-1 WN Flanges

Note: All materials must be supplied with appropriate certification (EN 10204 3.1/3.2) to verify compliance with EN1092-1 requirements.

Where EN1092-1 Weld Neck Flanges Are Essential

• Oil & Gas Industry: Pipeline connections, wellhead equipment, and processing facilities where high pressure and reliability are critical.
• Power Generation: Boiler connections, steam turbine inlets, and high-energy piping systems requiring high-temperature resistance.
• Chemical & Petrochemical: Processing equipment handling corrosive, toxic, or hazardous fluids where leak-tight integrity is paramount.
• Marine Applications: Shipboard piping systems exposed to corrosive seawater and dynamic loading conditions.
• Water Treatment Plants: High-pressure pump discharges, filter systems, and distribution networks requiring durable connections.
• Pharmaceutical & Food Processing: Sanitary systems where material purity and cleanability are essential.

Conclusion

EN1092-1 Weld Neck Flanges represent the gold standard for high-integrity pipe connections. Their welded construction, tapered-hub design, and full compliance with European dimensional and material standards make them the preferred choice for engineers who prioritize safety, longevity, and leak-free performance.

For projects requiring certified EN1092-1 Type 11 flanges—whether in carbon steel, stainless, or high-temperature alloys—partner with a supplier that provides full material traceability (EN 10204 3.1/3.2) and technical support.

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What are EN1092-1 Flanges?

EN1092-1 is a European standard for steel flanges. Flanges are flat, circular discs with holes that connect pipes, valves, pumps, and other equipment in a piping system. Think of them as “bridges” that hold pipe parts together tightly and securely.

The “EN” in EN1092-1 stands for “European Norm,” meaning this standard is used across Europe and many other countries worldwide. It sets clear rules for how flanges are designed, made, and sized. This ensures that flanges from different manufacturers work together (called compatibility) and are safe to use.

Key Features

EN1092-1 flanges have a few basic features that make them reliable.

• Size Markings: They use two easy labels: DN (nominal diameter, the size of the pipe opening) and PN (nominal pressure, how much pressure they can handle). DN ranges from 10 to 4000, and PN ranges from 2.5 to 400.
• Materials: Most are made of steel—like carbon steel, stainless steel, or alloy steel. The material choice depends on what the pipe carries (e.g., water, chemicals) and the temperature/pressure of the system.
• Sealing Faces: The part that touches the gasket (to stop leaks) comes in different types. The most common are flat face (FF) and raised face (RF)—simple designs that work for most jobs.
• Markings: Every EN1092-1 flange has clear labels, including the standard name (EN1092-1), DN, PN, material, and manufacturer. This makes it easy to choose the right one.

Common Types of EN1092-1 Flanges

There are different types of EN1092-1 flanges, each for a specific job. Here are the most common ones:

1. Slip-On Flanges (Type 01): These slip over the pipe and are welded in place. They’re cheap, easy to install, and good for low-pressure systems (like water pipes).
2. Weld Neck Flanges (Type 11): They have a long neck that’s welded to the pipe. Strong and durable, they’re perfect for high-pressure, high-temperature systems (like chemical plants) because they spread pressure evenly.
3. Blind Flanges (Type 05): These are like a cap—they close the end of a pipe. Useful for systems that might need expansion or maintenance later (you can easily remove them).
4. Threaded Flanges (Type 13): They have threads inside, so you can screw them onto a threaded pipe—no welding needed. Great for small pipes or places where welding isn’t allowed (like near flammable materials).

Why EN1092-1 Flanges Are Used Worldwide

EN1092-1 flanges are popular for simple reasons:

• Safe: The standard’s strict rules mean they’re less likely to leak or break, keeping workers and equipment safe.
• Compatible: Flanges from different brands fit together because they follow the same standard. No more guessing if a flange will work with your pipe.
• Versatile: They work in many industries—chemical plants, water treatment, energy, and more. Whether you’re moving water or chemicals, there’s an EN1092-1 flange for the job.

How to Choose the Right EN1092-1 Flange

Choosing the right flange is not difficult if you remember three things below:

• Check the DN: Make sure it matches the diameter of your pipe.
• Check the PN: Pick a flange that can handle the pressure of your system (don’t use a low-PN flange for high-pressure work).
• Consider the use case: For low pressure, slip-on flanges work well. For high pressure or temperature, go with weld neck flanges. If you need to close a pipe end, choose a blind flange.

Conclusion

EN1092-1 flanges are the reliable, standardized connectors that keep European industrial plants, water systems, and heating networks running safely. By understanding the basic types (like Weld Neck or Blind), the pressure rating (PN), the size (DN), and the material, it’s not a problem to make the right selection.

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Last December, we offered a quotation about EN 1092-1 flanges from one of our valuable clients. As usual, the client stated clearly their requirements on these flanges and confirmed that we would satisfy the needs. Then in January, we received purchase order and proceeded according to client’s demand. As this batch of flanges will be used for hydro test, we arranged extra inspection report for our client.

Flanges List

EN1092-1 Standard

EN 1092-1 is the European standard for circular steel flanges with nominal sizes from DN 10 to DN 4000. This standard covers pressure ratings from PN 2.5 to PN 400 and temperature ranges from -50°C to +600°C. As part of the broader European pressure equipment directive framework, EN 1092-1 provides specifications for flange dimensions, materials, pressure-temperature ratings, and sealing surfaces.

The standard classifies flanges into multiple types based on their construction and application requirements. Among these, Type 11 flanges represent a specialized category designed for specific industrial applications requiring robust performance under demanding conditions.

EN1092-1 Type 11 Flanges

Type 11 flanges, as defined in EN 1092-1, are welding neck flanges with a raised face and serrated finish. These flanges feature:

• Long tapered hub that provides stress distribution
• Welding bevel for butt welding to piping
• Raised face (typically 1-2 mm height)
• Serrated finish (spiral or concentric grooves) for improved gasket retention
• Full penetration weld capability for high-integrity connections

Key Characteristics of EN1092-1 Type 11 Flanges

• Pressure Ratings: Available in PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, and PN 400
• Temperature Range: Suitable for -50°C to +550°C depending on material grade
• Size Range: DN 10 to DN 2000
• Bolt Hole Configuration: Even number of bolt holes following EN 1092-1 drilling patterns

EN10222-2 P280GH Material

P280GH is a pressure vessel steel plate material specified in EN 10222-2 standard. This material is specifically designed for pressure equipment operating at elevated temperatures.

P280GH Chemical Composition

P280GH Mechanical Properties

Advantages of EN 1092-1 Flanges in P280GH

• Cost-Effectiveness: Non-alloy steel provides good properties at lower cost
• Weldability: Easily welded to carbon steel piping without special procedures
• Temperature Performance: Suitable for most industrial applications up to 400°C
• Availability: Widely available in European markets
• Standard Compliance: Fully compliant with European pressure equipment directives

Inspection Photos

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