Socket weld Flanges are an important feature of the plumbing system because they offer a safe and more reliable, and more secure way to connect pipes, valves, and other equipment. The material that the socket weld fittings manufacturers use affects their performance, longevity, and compatibility with the application in which the engineer integrates them. Doshi Impex India is a well-known socket weld flange supplier, and through this article, we will examine the socket weld flange’s high durability reasons, socket weld flange uses, socket weld flange dimensions, and various other aspects.
What is a socket weld flange?
Socket weld flanges are a kind of pipe flange that facilitates the joining of pipes of various diameters. It has a unique shape and consists of a flanged disc with a bore or socket. This is why it is called a socket weld flange. The pipe end and fillet weld portion can fit through this bore. As a result, this socket weld flange construction is suitable for processes and applications that operate at very high temperatures and in environments exposed to high pressure. The union connection of pipes and the flange sealing is created in such a manner that it is very strong and reliable.
We have provided the major details of socket weld flanges in the tables below. You can also find socket weld fittings PDFs online to understand them better.
Specifications of socket weld flange
| Specification | Details |
| Design Standards | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, BS |
| Available Sizes | ½” to 24″ (15 NB to 600 NB); larger sizes on request |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Connection Type | Socket weld – pipe inserted into a recessed area for fillet welding |
| Face Finish | Stock finish, Spiral serrated, Smooth finish |
| Applications | High-pressure, small diameter pipelines; chemical, oil & gas, power sectors |
| Inspection & Testing | Hydrostatic test, PMI test, Radiography (optional), Mill Test Certificates |
| Certifications | EN 10204 3.1 / 3.2, NACE MR0175 / ISO 15156 (on request |
Grades of socket weld flange
| Material | Grades |
| • Stainless Steel | SS 304, 304L, 316, 316L, 321, 347 |
| • Carbon Steel | ASTM A105, ASTM A350 LF2 |
| • Alloy Steel | ASTM A182 F1, F5, F9, F11, F22 |
| • Duplex/Super Duplex | UNS S31803 (Duplex 2205), UNS S32750 (Super Duplex 2507) |
| • Nickel Alloys | Inconel 600/625, Monel 400, Hastelloy C22/C276 |
Socket weld flanges dimensions
| NPS | OD (mm) | ID‑Socket (mm) | Socket Depth mm | Thickness (mm) | Bolt Holes Ø (mm) | Bolt Hole Circle Ø (mm) |
| ½″ | 60.3 | 15.9 | 13 – 14 | 19 – 22 | 17 | 70.0 |
| ¾″ | 79.4 | 20.7 | 14 – 15 | 22 – 24 | 17 | 81.0 |
| 1″ | 88.9 | 26.6 | 14 – 15 | 23 – 25 | 17 | 92.0 |
| 1¼″ | 109.5 | 34.9 | 15 – 17 | 24 – 26 | 17 | 108.0 |
| 1½″ | 114.3 | 40.9 | 17 – 18 | 25 – 27 | 17 | 117.0 |
| 2″ | 139.7 | 52.5 | 17 – 18 | 25 – 29 | 17 | 133.0 |
| 2½″ | 165.1 | 64.6 | 18 – 20 | 28 – 32 | 19 | 156.0 |
| 3″ | 190.5 | 77.8 | 18 – 20 | 28 – 34 | 19 | 178.0 |
| 4″ | 241.3 | 103.6 | 18 – 20 | 30 – 38 | 19 | 216.0 |
| 6″ | 323.9 | 156.4 | 20 – 22 | 35 – 46 | 22 | 279.0 |
| 8″ | 406.4 | 210.5 | 22 – 24 | 41 – 54 | 22 | 343.0 |
| 10″ | 482.6 | 265.0 | 22 – 24 | 46 – 60 | 22 | 406.0 |
| 12″ | 584.2 | 318.5 | 22 – 24 | 51 – 65 | 22 | 476.0 |
Crucial Elements and Form of Socket Weld Flanges
- The Strong and leak-proof connections have a special form of socket weld flanges that include a raised shoulder that permits appropriate alignment and support, as well as a recessed socket where the pipe is inserted. The connections have a high strength and are completely leak-proof. This connection is important for the system because it makes it extremely resilient to wear and tear. Moreover, it protects the system against vibration and thermal expansion by making the necessary arrangements.
- The raised shoulder ensures a connection that is completely secure, and it offers the large pipe the ideal alignment and appropriate support.
- Socket weld flanges have high durability and a compact size when compared to other types of flanges, and this light and smaller size makes them perfect for applications that have space constraints and appliances and systems that are installed in a restricted amount of space.
- All the socket weld flanges dimensions are constructed to be sturdy, which helps them to endure extremely high temperatures and different ranges of pressures that are commonly found in different kinds of industrial settings and in a variety of industrial applications.
| Feature Category | Specification / Description |
| Connection Type | Socket Weld – internal socket allows precise pipe alignment before welding |
| Fit Tolerance | Tight machining tolerances ensure accurate pipe insertion and minimal misalignment |
| Weld Type | Fillet weld at the outer hub—reinforces the connection without penetrating the bore |
| Durability Level | Highly designed for repeated pressure cycles and vibration-prone environments |
| Material Strength | Made from high-strength alloys (e.g., ASTM A182, ASTM A105) for long service life |
| Corrosion Resistance | Available in stainless, duplex, and nickel alloys for harsh or corrosive environments |
| Pressure Ratings | Class 150 to 2500 – suitable for low to very high pressure applications |
| Temperature Tolerance | Operates reliably in both cryogenic and high-temperature environments (–50°C to 600+°C) |
| Face Types for Sealing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) for optimal sealing |
| Leak Prevention | Smooth bore alignment minimizes turbulence and internal erosion, ensures a tight, leak-free joint |
| Usage Environment | Ideal for oil & gas, petrochemical, marine, power generation, and high-pressure fluid systems |
| Compliance | Meets ASME, ANSI, DIN, and EN standards for performance and safety |
Key Aspects of Socket Weld Flanges Contributing to Durability:
1. Strong Attachment
Socket weld flanges’ high durability is because they have an extremely strong connection that is capable of handling large variations in temperature between the pipe and the flange
2. Leak-proof seal
The socket weld fitting manufacturers produce the flanges in such a manner that they have a tight seal because it reduces the possibility of leaks, which is crucial in those applications that have a highly valuable material. Similarly, it can be important for those industries that have tubes that carry highly risky and hazardous materials.
3. Compact design
A socket weld flange supplier ensures that the flange has a compact design. Therefore, they can set up in places where the space is restricted or there is difficulty accessing the space easily for everyone.
4. Smooth Flow path
The socket weld flange dimensions are produced in such a way that the flange can reduce the chances of turbulence and pressure drop because the transition from pipe to the flange is smooth, and this aspect enhances the system performance.
5. Material selection
Socket weld fittings manufacturers use premium materials that provide exceptional strength and corrosion resistance. Some of the common materials are alloy steel, carbon steel, and stainless steel, which ensure long-lasting performance.
Important features of socket weld flanges that help ensure a precise fit
The installation and design of a standard socket weld flange help to achieve a precision fit and a waterproof connection. This is possible because of the following reasons:
- Socket weld flanges’ dimensions have a natural strength and resistance to high temperatures and pressures
- Employing fillet welds to attach the pipe and flange.
- A socket that properly fits the outside diameter of the pipe.
- A space is provided for thermal expansion during welding.
Conclusion
Standard socket weld flanges are a great alternative when your application requires both high durability and a precise fit. These flanges guarantee strong and leak-proof connections even in the face of extreme temperatures because of their unique design. They provide constant performance, safety, and dependability. Therefore, socket weld flange uses are more prominent in high-pressure fluid systems, petrochemical, oil and gas, and power production facilities.
Doshi Impex India is a reputed socket weld flange supplier. We source our standard socket weld fittings from world-renowned socket weld fittings manufacturers who are able to provide all socket weld flange dimensions and even offer customization options. We promise socket weld flanges with high durability. We have been in this industry for many years, and we have clients across industries who trust our expertise and the quality of our Socket weld Flanges. Get in touch with us today to get Socket weld flanges at the best price.
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