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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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 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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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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Accurate knowledge of the weight and volume of various branch sockets is vital for project budget control, logistics planning, and pipeline stress analysis. This article provides an in-depth analysis of branch socket (Olet) standards and types, along with the most practical quick reference guide for weight and volume.

What is an Olets? Why choose it?

A olet provides a branching point from a large-diameter pipe to a smaller-diameter pipe. The pipe welded onto the tee is called the main pipe, while the pipe welded onto the tee is called the branch pipe. Olet fittings come in full sizes, types, bores, and pressure ratings. Materials can include stainless steel, chromium-molybdenum alloy, or other alloy materials.

Olet fittings are providing an outlet from a larger pipe to a smaller one. They are used to instead of connected fittings such as reducing tees, reinforcing plates, and reinforced pipe sections.

There are many types based on the varity piping connected methods that weldolet, thredolet, sockolet, latrolet, elbolet and more. Why they are popular, because its outstanding advantages, such as safety, reliability, low cost and simple construction.

Types of Olet

Weldolet

Sockolet

Threadolet

Elbolet

Latrolet

SCH5S Pipet

SCH10S Pipet

Free Download: Complete Olet Pipe Fitting Weight and Volume Data Sheet

To facilitate quick reference and calculation for engineers, we have compiled a comprehensive table of weights and volumes for commonly used Olet pipe fittings. This includes data for STD, XS, XXS SCH160 specifications across all wall thicknesses, ready for use in procurement lists, cost calculations, and construction plan preparation.

Click to download: Complete Olet Pipe Fitting Weight and Volume Data Sheet

How to Obtain Weight and Volume Data for customized Olet  Fittings?

If customized Olet specifications (e.g., special materials, custom dimensions) are used in your project, precise data can be obtained through the following three methods:

Contact ZIZI Manufacturer for Calculation: Provide main pipe/branch pipe specifications, wall thickness, and material requirements.

Use specialized calculation tools: We recommend the “Pipe Fitting Weight Calculator” (some tools support Olet-specific calculations). Input parameters to generate theoretical values.

Reference industry standard conversions: Estimate based on Olet dimensional tolerances in ASME B16.11 standards combined with foundational formulas. Error margins can be controlled within 5%.

Mastering Olet fitting weight and volume data is crucial for achieving “precise selection, cost control, and safe construction” in piping projects. Free Download: Complete Olet Pipe Fitting Weight & Volume Data Table

To facilitate quick reference and calculation for engineers, we’ve compiled a comprehensive table of weights and volumes for commonly used Olet pipe fittings. It includes data for STD, XS, XXS SCH160 across all wall thicknesses, ready for use in procurement lists, cost calculations, and construction plan development.

Click to Download: Complete Olet Pipe Fitting Weight & Volume Data Table

Importance of Olet Weight and Volume Tables

Transportation and Packaging

Accurate weight facilitates freight cost calculations.

Volume data aids in optimizing storage and loading space.

Cost Accounting

Steel prices are often quoted by weight.

Precise data assists in establishing reasonable procurement budgets.

Engineering Design and Installation

Pipe fitting weight impacts stress distribution and support requirements in piping systems.

Engineers must reference weight tables to ensure safety.

Quality and Standards Control

Ensure Olet compliance with ASME and MSS-SP standards.

Prevent installation or acceptance issues caused by weight discrepancies.

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In industrial piping systems for oil, gas, chemical, and power industries, butt weld pipe fittings serve as critical components for connecting pipes, altering flow direction, and changing pipe dimensions. These fittings must comply with stringent industry standards to ensure the safe, reliable, and efficient operation of the system.

ASME B16.9 is an internationally recognized standard for butt weld pipe fittings, covering requirements for dimensions, tolerances, inspection, and marking. Whether for elbows, tees, crosses, reducers, or caps, ASME B16.9 provides comprehensive specifications. During engineering projects and procurement processes, the Weight and Volume Chart serves as a critical reference tool. It not only impacts transportation and packaging but also directly influences cost calculations and pipeline system design.

Accurate knowledge of these fittings’ weights and volumes is essential for procurement, logistics, project cost estimation, and structural stress analysis.

ASME B16.9 Pipe Fitting Weight Calculation

Weight of 90° Elbow

Based on carbon steel density of 7.85 kg/dm³, the formula is:

W = 9.685 × 10⁻⁶ × R × (D² – d²)

Where: W is weight (kg), R is radius of curvature (mm), D is outer diameter (mm), d is inner diameter (mm).

Derived Rules:

45° elbow weight is calculated as half that of a 90° elbow.

180° elbow weight is calculated as double that of a 90° elbow.

Short-radius (R=1.0DN) elbows are estimated at two-thirds the weight of long-radius elbows.

Basic Steel Pipe Weight

As a reference benchmark for pipe fitting weight calculations, the formula is:

W = 0.02466 × T × (D – T)

Where: W is weight per meter (kg/m), T is wall thickness (mm), D is outer diameter (mm). Stainless steel pipes require an additional correction factor of 1.015.

Non-Standard Wall Thickness Estimation

For specifications not listed in standard tables, use the proportional estimation formula:

Q = W × t / T

Where: Q is estimated weight (kg), W is weight for known wall thickness at the same nominal diameter, t is target wall thickness (mm), and T is known wall thickness (mm).

Butt Weld Pipe Fittings Types

Elbows: Used to alter pipeline flow direction. Common types include 90° long radius (LR), 90° short radius (SR), and 45° elbows.

Long Radius (LR) Elbows: Bending radius equals 1.5 times the nominal size (NPS), offering low fluid resistance.

Short Radius (SR) Elbows: Bending radius equals the nominal size (NPS), suitable for space-constrained applications.

Tees: Used for pipe branching. Includes equal tees and reducing tees.

Reducers: Used to connect pipes of different sizes. Classified as concentric reducers and eccentric reducers.

Pipe Caps: Used to seal pipe ends.

Conclusion

The ASME B16.9 Butt-Weld Fittings Weight and Volume Tables serve as an essential tool for engineers, procurement personnel, and project managers. Whether used for transportation calculations, cost budgeting, or system safety analysis, accurate data is critical.

Want to get the complete ASME B16.9 Butt Weld Pipe Fittings Weight and Volume Tables PDF? Click the button below to download it for free:

✅ Free Download: ASME B16.9 Butt Weld Pipe Fittings Weight and Volume Table PDF

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What is a Pipe Nipple?

A pipe nipple can be simply understood as a short section of threaded pipe. Its primary function is to serve as a transition connector, bridging two components (such as elbows, tees, valves, etc.) that need to be connected within a piping system. Due to its short length and threaded ends, it is highly convenient when adjusting connection distances or altering connection methods.

Types of Pipe Nipples

1. Close Pipe Nipples

Features: Threads run the entire length of the pipe fitting, with the threads at both ends nearly touching. There is no threadless shoulder or barrel section in the middle, enabling extremely compact installation in pipe connections.

Applications: Used to tightly connect two female-threaded fittings together, leaving no exposed body of the pipe fitting. Once installed, removal is nearly impossible without specialized tools such as pipe wrenches. Commonly employed in space-constrained applications, particularly suited for short-distance connections between equipment and piping systems.

2. Hexagon Nipples

Features: The pipe fitting features a hexagonal nipple (resembling a nut) at its center, with threads at both ends.

Applications: The hexagonal design facilitates installation or removal using a wrench, providing a better grip point and leverage surface. It serves as a common transition piece for connecting different fittings. Used in pipe connections requiring frequent maintenance or disassembly.

3. Long Pipe Nipples

Features: The long pipe nipple is longer than the ordinary nipple, which can effectively extend the distance between pipes. It has threads at both ends and a non-threaded barrel part in the middle.

Applications: Used when a longer connection span is required between two connection points or when bridging obstacles. Examples include building plumbing systems and industrial pipeline networks.

4. Reducing Pipe Nipples

Features: The pipe fitting features threads of different diameters at both ends.

Applications: Used to connect two pipe fittings or pipes of different sizes, enabling gradual reduction or expansion of pipe diameter. Commonly found in petroleum, chemical, and water supply systems.

5. Barrel Nipples

Features: Threaded at both ends with a distinct smooth, unthreaded section in the middle, resembling a small barrel or featuring a “shoulder.”

Applications: This is the most common type of pipe fitting. The unthreaded section in the middle provides a grip area after connection, facilitating wrench operation and allowing some adjustment of the connection distance. Widely used in general industrial and civil piping systems, it is one of the most common types of short sections.

6. Swage Nipples

Features: Resembling a reducer, it connects two pipes of different diameters. These can be concentric (with aligned axes) or eccentric (with offset axes). Typically, one end features internal/external threads, while the other end is either a straight end or a beveled end (for welding).

Applications: Primarily used to change pipe diameters, they also serve as transitions from threaded to welded connections.Particularly suited for high-pressure or high-temperature environments, they are widely used in power generation, petrochemical, and boiler systems.

7.  Welded Pipe Nipples

Features: Welded pipe nipple feature welded ends without threads. Typically consisting of short, beveled pipe sections, they are used to connect to other components or pipes within a piping system via welding, providing a stronger, leak-proof connection.

Applications: Suitable for high-pressure, high-temperature environments or situations requiring permanent connections.

8. Threaded Pipe Nipples

Features: Refers broadly to pipe fittings with external threads at both ends, enabling direct connection to internally threaded pipe components. This is the most universal classification, encompassing types such as fully threaded, barrel-shaped, and hexagonal.

Applications: The most common connection method, linking threaded fittings to internally threaded pipe components, valves, and similar equipment. Widely used in medium- and low-pressure fluid piping systems.

9. Threaded Nipple with Thread one End

Features: External threads on one end only, with a smooth end on the other.

Applications: Typically used at pipe ends, with one end threaded for connection and the other smooth end suitable for welding or as an outlet.

10. Seamless Pipe Nipples

Features: Manufactured by cutting and processing seamless steel pipes, featuring no weld seams on the pipe body. Offers superior strength and enhanced pressure resistance.

Applications: Suitable for high-pressure applications or scenarios demanding exceptional pipe integrity, as seamless pipes deliver greater strength and reliability than welded pipes. A common choice in the power, petrochemical, and energy industries.

11. Galvanized Nipple

Features: Made of carbon steel with a hot-dip galvanized or electrogalvanized surface treatment, effectively preventing corrosion and rust.

Applications: The galvanized coating provides excellent corrosion protection. Commonly used in water pipes, fire protection systems, and general low-pressure non-corrosive medium piping systems.

12. Hose Nipple

Features: Typically features an external threaded end for connecting to piping systems, and a stepped barb connector (commonly known as a “pagoda head”) at the other end for inserting and securing hoses.

Applications: Used to connect rubber or plastic hoses, widely employed in agricultural irrigation, water systems, and machinery equipment for hose connections.

13. Stainless steel nipples

Features: Manufactured from various grades of stainless steel (e.g., 304, 316).

Applications: Offers exceptional corrosion resistance and high-temperature tolerance. Widely used in chemical processing, food manufacturing, pharmaceutical production, marine environments, and other applications demanding high cleanliness or corrosion resistance.

14. Alloy Steel Nipple

Characteristics: Manufactured from steel containing alloying elements other than carbon, such as chromium, molybdenum, nickel, etc.

Applications: Suitable for demanding conditions involving high temperatures, high pressures, or low temperatures, offering higher strength and specific corrosion resistance compared to carbon steel. Commonly used in power plants, refineries, and similar facilities.

15. Carton Steel Nipple

Characteristics: Made from carbon steel (primarily composed of iron and carbon). Offers lower cost and higher strength.

Applications: The most common material for pipe fittings. Widely used in low- and medium-pressure industrial and commercial piping systems for non-corrosive fluids such as water, oil, and gas.

Note: Prone to rusting without surface treatment (e.g., galvanization).

Pipe Nipple Sizes

Standard Sizes

Pipe nipples typically range in diameter from 1/8 inch to 12 inches. Lengths vary from short to extra-long, with the longest reaching up to 72 inches. The most commonly used sizes fall between 1/2 inch and 2 inches, accounting for 70% of industrial applications. When selecting pipe nipples, note that the actual outside diameter is approximately 1/8 inch larger than the nominal size.

Pipe Nipple Length and Diameter

Pipe fitting length refers to the measurement from one end to the other (from one threaded end to the other). Tube fitting sizes range from short tubes (1/8 inch to 1/4 inch) to long tubes (up to 72 inches). Diameter plays a vital role in matching with other components.

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What is a union?

A union, also known as a union joint, is a component used for removable connections between pipes. It typically consists of three parts: a male end, a female end, and a gasket. The male and female ends are connected to the two pipes to be joined, achieving a tight seal through threaded connections, while the gasket serves as a seal to prevent leakage of the medium inside the pipes.

Compared to traditional welding or flange connections, the most significant feature of union is their removability. This feature makes pipeline installation, maintenance, and replacement more convenient, eliminating the need for destructive operations on the pipeline, significantly improving work efficiency, and reducing maintenance costs.

MSS SP-83 Pipe Union Specification

ZIZI offered range of MSS SP-83 Union Pipe Fittings is intended and developed in accordance with the international quality standards at our infrastructure facility to achieve the very best benchmarks of quality. Our modernized infrastructure is crowned by means of recent tools and advanced machines that enable us to satisfy the large demands of customers in a dexterous manner. Our products are can further be made-to-order as per the detailed requirements given by our valuable Client..

Types of Unions

Socket Weld Union:

Socket welding involves inserting a steel pipe into a socket hole for welding, hence the term socket weld union. A socket coupling consists of a socket, a spigot, and a socket groove, with the distinctive feature of a socket groove on the spigot, and the spigot and socket located at opposite ends. Socket unions can be widely applied to pipes of various diameters and are also suitable for water meters and valves. Due to the socket structure, pipe joints reduce costs and offer extremely convenient installation, use, and maintenance, while also providing excellent leak prevention capabilities, making them highly promising in the market.

Threaded Union:

Threaded connections involve screwing steel pipes into threaded holes for connection, hence the term threaded union.Threaded unions are the most common type of joint, characterized by using a threaded connection method for pipe connections. They primarily consist of three parts: a male end with external threads, a female end with internal threads, and a nut. By rotating the nut, the sealing surfaces of the male and female ends can be tightly aligned, thereby achieving connection and sealing. Thread forms can include BSP, NPT, G, etc., and the connection is further secured using a locking nut and a seal ring. Suitable for small-diameter pipes, threaded connections achieve pipe sealing. They are easy to install and commonly used in water pipes, gas pipes, and other applications.

MSS SP-83 Union Dimension and Weight

Class 3000 Socket Weld Union Dimension

Dimensions in inches

Class 6000 Socket Weld Union Dimension

Dimensions in inches

CLASS 3000 Threaded Union Dimensions

Dimensions in inches

CLASS 6000 Threaded Union Dimensions

Dimensions in inches

Weight List

SW & THD Union volume

If you want to know more about the weight and volume of forged pipe fittings, please click on the following keywords

• ASME B16.11 Socket Weld Fitting Weight and Volume Chart
• ASME B16.11 Threaded Fitting Weight and Volume Chart

Union Pipe Fittings Applications

Water treatment systems

Petrochemical pipelines

Heating, ventilation, and air conditioning (HVAC) systems

Pharmaceutical and food industry piping

Laboratory and research piping systems

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ASTM A193 specifies alloy and stainless steel bolt materials and their components for pressure equipment operating under high-temperature, high-pressure conditions or other special applications. This standard covers multiple bolt grades, such as ferritic steel and austenitic stainless steel, with common grades including B5, B6, B7, B8, and B8M. These different bolt grades exhibit variations in chemical composition, mechanical properties, and heat treatment requirements to meet the demands of diverse operating conditions.

ASTM A193 Material Details

ASTM A193 Bolts Grades Details

Grade B7

ASTM A193 B7 bolts and studs are manufactured from chromium-molybdenum steel and undergo quenching and tempering (heat treatment) to achieve the required mechanical properties (strength). Grade B7 is the most commonly used A193 bolt grade in the construction industry. B7 studs and short-head bolts are readily available on the market. B7 bolts are frequently used in pipeline flange connections. They typically feature hot-dip galvanizing, zinc plating, Xylan coating, PTFE coating, or other corrosion-resistant finishes. B7 bolts demonstrate outstanding performance in applications such as boiler pressure vessel connections in the power industry and high-pressure reactor connections in the chemical industry. Their high strength enables them to withstand immense pressure, while their excellent toughness ensures resistance to fracture under temperature fluctuations or in vibrating environments.

Chemical Composition

Mechanical Property

Grade B7M

ASTM A193 Grade B7M bolts and studs share the same chemical composition as Grade B7 (quenched and tempered medium-carbon alloy steel), but feature lower strength requirements and mandate 100% hardness testing for all fasteners within the same production lot. B7M bolts possess resistance to chloride, sulfide, and hydrogen-induced stress corrosion cracking (SCC), making them suitable for use in sour gas environments.

Grade B8

B8 grade bolts are manufactured from AISI 304 stainless steel and undergo solution treatment. These bolts offer excellent corrosion resistance and are widely used in industries with stringent corrosion requirements, such as food processing, pharmaceuticals, and marine engineering. In food and beverage production equipment, B8 bolts prevent product contamination from corrosion while ensuring structural integrity.

Chemical Composition

Mechanical Property

Grade B8M

B8M grade bolts are manufactured from AISI 316 stainless steel and undergo the same solution treatment. Compared to B8 bolts, B8M offers superior corrosion resistance due to the addition of molybdenum, demonstrating exceptional performance against pitting and crevice corrosion. In highly corrosive environments such as chemical processing and seawater desalination, B8M bolts serve as an ideal fastening solution, ensuring long-term stable operation of equipment under harsh conditions.

Chemical Composition

Mechanical Property

Grade B16

ASTM A193 Grade B16 bolts and studs are manufactured from chromium-molybdenum-vanadium alloy steel. While the strength requirements for A193 Grade B16 bolts and studs are similar to Grade B7, the addition of vanadium and a higher tempering temperature enable these fasteners to maintain their microstructure and strength at higher ambient temperatures than Grade B7. Unlike the stainless steel grades in the A193 specification, Grade B16 does not possess corrosion resistance unless coated.

Chemical Composition

Mechanical Property

Grade B5  

B5 grade bolts are manufactured from 4-6% chromium ferritic steel. This material provides the bolts with favorable high-temperature performance and moderate corrosion resistance, making them suitable for environments with specific temperature requirements and moderate corrosion risks.

Chemical Composition

Mechanical Property

Grade B6

B6 grade bolts are made from 13% chromium ferritic steel. With appropriate heat treatment, they exhibit good strength and resistance to high-temperature oxidation. They are commonly used in high-temperature applications such as valves and pipe connections. In the high-temperature piping systems of petroleum refineries, B6 bolts reliably connect pipe components, ensuring no loosening or failure occurs during the transportation of oil products under high temperature and pressure conditions.

Mechanical Property

How to choose the right ASTM A193 bolt?

Selecting the right ASTM A193 bolts requires considering several key factors:

Operating Temperature: Select the appropriate grade based on the maximum and minimum temperatures of the application. For example, B16 is preferred for high-temperature applications, while B7 is sufficient for ambient conditions.

Operating Pressure: The bolt’s strength grade (such as B7 and B16) directly affects its load-bearing capacity.

Corrosive Environment: If corrosive media, such as acidic or saltwater environments, are present, a stainless steel grade (such as B8 or B8M) must be selected.

Coating and Surface Treatment: To improve corrosion resistance, bolts can be hot-dip galvanized or PTFE-coated. Choosing the right coating can extend the bolt’s service life.

ASTM A193 Standard

This specification” covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. See Specification A962/A962M for the definition of bolting. Bars and wire shall be hot-wrought and may be further processed by center less grinding or by cold drawing. Austenitic stainless steel may be carbide solution treated or carbide solution treated and strain-hardened.When strain hardened austenitic steel is ordered, the purchaser should take special care to ensure that Appendix X1 is thoroughly under-stood.

High Temperature Tests

Tests to determine high temperature properties shall be made in accordance with Test Methods E21, E139, and E292, and Practices E150 andE151.

Charpy Impact Tests

Charpy impact tests based on the requirements of specification A320/A320M, shall be made as agreed between the manufacturer and the purchaser. When testing temperatures are as low as those specified in specification A320/A320M, bolting should be ordered to that specification in preference to this specification

100 % Hardness Testing of Grade B7M

Each Grade B7M bolt or stud shall be tested for hardness by indentation method and shall meet the requirements specified in tables

 Length Tolerances for Bolts

Applications

Petrochemical Industry — High-pressure pipelines, heat exchangers, reactors

Energy and Power Generation — Boilers, steam pipelines, turbines

Shipbuilding and Offshore Engineering — Corrosion-resistant equipment, offshore platforms

Valves and Flange Connections — High-temperature, high-pressure sealing systems

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Forged socket weld tees are categorized by construction as either equal or reduced. Sizes range from DN6 to DN100, with DN15 to DN50 being the most common. Materials include carbon steel, stainless steel, and alloy steel. Pressure ratings include 3000 lbf, 6000 lbf, and SCH80. The product complies with the American standard ASME B16.11.

Socket Weld Tee Specification 

ASMJE B16.11 Socket Weld Tee Types & Weight Chart

Equal Socket Weld Tee

An equal-diameter socket weld tee has three identical pipe openings and is commonly used in piping systems with identical main and branch pipe sizes. It ensures even flow distribution or confluence between the main and branch pipes, maintaining flow stability and pressure balance. Equal-diameter tees are widely used in applications requiring high fluid transport requirements, such as the oil and gas, chemical, and power industries.

Reducing Socket Weld Tee

A reducing socket weld tee has branch pipes with smaller diameters than the main pipe and is used to connect main and branch pipes of different sizes. It allows for a transition in pipe diameter when branching, effectively adjusting flow and pressure, and optimizing the efficiency of the piping system. Reducing tees are often used in applications requiring variable flow rates or flow split ratios, and are particularly common in high-pressure, high-temperature, and corrosion-resistant pipeline projects.

Application Areas

Oil and Gas Transportation

Chemical and Petrochemical Plants

Power and Boiler Systems

Shipbuilding and Marine Engineering

High-Pressure Hydraulic and Steam Systems

Forged Tee Weight Chart in KG

ASME B16.11 Socket Weld Tee Dimensions 

Material & Grades of Forged Fittings Tees 

Carbon Steel :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Copper Alloy Steel :

 ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

ASME B16.11 Standard

This Standard covers ratings, dimensions, tolerances,marking, and material requirements for forged fittings, both socket-welding and threaded, as illustrated in Tables 1 through 5 and Tables I-1 through I-5, inclusive.

Fitting Types/Configuration.

Types of fittings covered by this Standard are shown in Table 6, by class and size range.

Special Fittings.

Fittings with special dimensions, threads, or counterbores may be made by agreement between the manufacturer and purchaser.

When such fittings meet all other stipulations of this

Standard, they shall be considered in compliance therewith, provided they are appropriately marked.

 Tolerance

Concentricity of Bores

The socket and fitting bores shall be concentric within a tolerance of 0.8 mm (0.03 in.) for all sizes. Opposite socket bores shall be concentric within a tolerance of 1.5 mm (0.06 in.) for all sizes.

Coincidence of Axes

The maximum allowable variation in the alignment of the fitting bore and socket bore axes shall be 1 mm in 200 mm (0.06 in. in 1 ft). The maximum allowable variation in alignment of threads shall be 1 mm in 200 mm (0.06 in. in 1 ft).

Marking and Packaging

Our products, such as our ASME B16.11 socket weld tees, are carefully packaged to prevent damage during shipping. For export, we use standard wooden crates or cartons. All forged socket weld tees are marked with our trademark (company logo), grade, size, and batch number. We can also customize our products with custom labeling upon request.

Manufacturers of ASME B16.11 Forged Fittings

The Socket Weld Tee, with its advantages of high-pressure resistance, corrosion resistance, easy installation, and wide applicability, has become an indispensable key component in industrial piping systems. Selecting the appropriate Socket Weld Tee can significantly enhance the stability and service life of the piping system.

When purchasing Socket Weld Tees, it is recommended to prioritize products manufactured by reputable manufacturers that comply with international/domestic standards, and to select the appropriate type based on the characteristics of the medium and operating conditions. During installation, strict adherence to specifications is essential to ensure the quality of the connections.

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