Weld Neck Flange Manufacturer
Weld Neck Flanges Leading Manufacturers, Welding Flanges, Weld Neck Flange Supplier, Stainless Steel Weld Neck Flanges, High Pressure Weld Neck Flanges, WNRF Flanges, Welding Neck Flanges, Weld Neck Flanges Supplier, WNRF Flanges Manufacturers
Kalpataru Piping Solutions is a leading weld neck flanges manufacturer in India, producing high-quality welding neck flanges. These flanges are ideal for industries that handle high pressure and extreme temperatures. Designed to be welded to pipes, weld neck flanges distribute stress evenly, reducing strain on the flange base.
Our WNRF flanges are made from premium materials using advanced techniques. They are corrosion-resistant, strong at high temperatures, and have excellent tensile strength. We offer various weld neck flange types, including standard, long, and reducing flanges, each tailored to specific needs.
We provide different surface treatments, such as galvanization and painting, based on customer requirements. Our team has extensive expertise in manufacturing and distributing weld neck flanges, understanding the importance of selecting the right flange for your project’s success.
What Is A Welding Flange?
Welding neck flanges, also known as weldneck flange or WNRF (Weld Neck Raised Face) flanges, are vital components used to connect pipes, valves, pumps, and other equipment in piping systems. They are designed with a tapered neck that is welded to the pipe, ensuring a smooth and continuous connection.
These flanges play a crucial role in distributing stress from the flange to the pipe, minimizing stress concentration and ensuring a strong, leak-free joint. Welding flanges are typically forged from high-quality materials such as carbon steel or stainless steel, making them capable of withstanding high pressures and temperatures commonly found in industrial applications.
WNRF flanges are distinguished by their raised face, which provides a sealing surface for gaskets, ensuring a tight seal when bolted to another flange or piece of equipment. Various weld neck flange types are available to meet different needs, including standard, long, and reducing neck flanges.
Weld Neck Flanges Types
Welding neck flanges come in two main types based on their neck shapes:
- Long Weld Neck Flange: A long weld neck flange has an extended neck that helps distribute stress more evenly and reduces high-stress points at the bottom of the flange. This design ensures a strong and durable connection between pipes or fittings, making it suitable for high-pressure and high-temperature environments. These flanges are widely used in industries like oil and gas, chemical, and petrochemical due to their stability and durability.
- Reducing Weld Neck Flange: A reducing weld neck flange has a tapered neck that gradually decreases in diameter from the flange base to the pipe. This design facilitates smooth flow transitions and reduces stress at the connection point. It is commonly used in industries such as oil and gas, chemical processing, and manufacturing, where secure and precise pipe connections are essential.
Materials of WNRF Flanges
Weld neck flanges are made from various materials to suit different applications. Carbon steel is often chosen for its affordability and durability, making it suitable for general-purpose use. Stainless steel is preferred for environments requiring corrosion resistance, such as the food industry and marine settings. Alloy steel is selected for its strength and wear resistance, ideal for high-temperature and high-pressure applications. The choice of material depends on factors like operating conditions, fluid compatibility, and environmental considerations to ensure optimal performance and longevity.
Welding Flanges Specifications
| Standard | Description |
| ANSI/ASME | American National Standards Institute/ASME |
| DIN | Deutsches Institut für Normung (German standard) |
| EN | European Norm (European standard) |
| JIS | Japanese Industrial Standards |
| BS | British Standards |
| ISO | International Organization for Standardization |
| GOST | Russian national standards |
Grades of WNRF Flanges
Stainless Steel Weld Neck Flanges : ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel Weld Neck Flanges : ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel Weld Neck Flanges : ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
Low Temperature Carbon Steel Weld Neck Flanges : ASTM A350, LF2, LF3
Alloy Steel Weld Neck Flanges : ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Copper Alloy Steel Weld Neck Flanges : 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 Weld Neck Flanges : 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)
Weld Neck Flanges Schedule Chart
| Nom Pipe Size | Outside Diam | Sched 10 | Sched 20 | Sched 30 | Std. Wall | Sched 40 | Sched 60 | Extra Strong | Sched 80 | Sched 100 | Sched 120 | Sched 140 | Sched 160 | Double Extra Strong |
| 1/2” | 0.840 | 0.674 | – | – | 0.622 | 0.622 | – | 0.546 | 0.546 | – | – | – | 0.464 | 0.252 |
| 3/4” | 1.050 | 0.884 | – | – | 0.824 | 0.824 | – | 0.742 | 0.742 | – | – | – | 0.612 | 0.434 |
| 1” | 1.315 | 1.097 | – | – | 1.049 | 1.049 | – | 0.957 | 0.957 | – | – | – | 0.815 | 0.599 |
| 1.1/4” | 1.660 | 1.442 | – | – | 1.380 | 1.380 | – | 1.278 | 1.278 | – | – | – | 1.160 | 0.896 |
| 1.1/2” | 1.900 | 1.682 | – | – | 1.610 | 1.610 | – | 1.500 | 1.500 | – | – | – | 1.338 | 1.100 |
| 2” | 2.375 | 2.157 | – | – | 2.067 | 2.067 | – | 1.939 | 1.939 | – | – | – | 1.687 | 1.503 |
| 2.1/2” | 2.875 | 2.635 | – | – | 2.469 | 2.469 | – | 2.323 | 2.323 | – | – | – | 2.125 | 1.771 |
| 3” | 3.500 | 3.260 | – | – | 3.068 | 3.068 | – | 2.900 | 2.900 | – | – | – | 2.624 | 2.300 |
| 3-1/2” | 4.000 | 3.760 | – | – | 3.548 | 3.548 | – | 3.364 | 3.364 | – | – | – | – | 2.728 |
| 4” | 4.500 | 4.260 | – | – | 4.026 | 4.026 | – | 3.826 | 3.826 | – | 3.624 | – | 3.438 | 3.152 |
| 5” | 5.563 | 5.295 | – | – | 5.047 | 5.047 | – | 4.813 | 4.813 | – | 4.563 | – | 4.313 | 4.063 |
| 6” | 6.625 | 6.357 | – | – | 6.065 | 6.065 | – | 5.761 | 5.761 | – | 5.501 | – | 5.187 | 4.897 |
| 8” | 8.625 | 8.329 | 8.125 | 8.071 | 7.981 | 7.981 | 7.813 | 7.625 | 7.625 | 7.437 | 7.187 | 7.001 | 6.813 | 6.875 |
| 10” | 10.750 | 10.420 | 10.250 | 10.136 | 10.020 | 10.020 | 9.750 | 9.750 | 9.562 | 9.312 | 9.062 | 8.750 | 8.500 | 8.750 |
| 12” | 12.750 | 10.420 | 10.250 | 12.090 | 12.000 | 11.938 | 11.626 | 11.750 | 11.374 | 11.062 | 10.750 | 10.500 | 10.126 | 10.750 |
| 14” | 14.000 | 13.500 | 13.376 | 13.250 | 13.250 | 13.124 | 12.812 | 13.000 | 12.500 | 12.124 | 11.814 | 11.500 | 11.188 | – |
| 16” | 16.000 | 15.500 | 15.376 | 15.250 | 15.250 | 15.000 | 14.688 | 15.000 | 14.312 | 13.938 | 13.564 | 13.124 | 12.812 | – |
| 18” | 18.000 | 17.500 | 17.376 | 17.124 | 17.250 | 16.876 | 16.500 | 17.000 | 16.124 | 15.688 | 15.250 | 14.876 | 14.438 | – |
| 20” | 20.000 | 19.500 | 19.250 | 19.000 | 19.250 | 18.812 | 18.376 | 19.000 | 17.938 | 17.438 | 17.000 | 16.500 | 16.062 | – |
| 24” | 24.000 | 23.500 | 23.250 | 22.876 | 23.250 | 22.624 | 22.062 | 23.000 | 21.562 | 20.938 | 20.376 | 19.876 | 19.312 | – |
| 30” | 30.000 | 29.376 | 29.000 | 28.750 | 29.250 | – | – | 29.000 | – | – | – | – | – | – |
| 36” | 36.000 | 35.376 | 35.000 | 34.750 | 35.250 | 34.500 | – | 35.000 | – | – | – | – | – | – |
| 42” | 42.000 | – | – | – | 41.250 | – | – | 41.000 | – | – | – | – | – | – |
Welding Flanges Weight Chart
| Nom Pipe Size | 150# | 300# | 600# | 900# | 1500# | 2500# | ||||||||||||
| WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | |
| 1/2” | 0.7 | 0.4 | 0.5 | 0.8 | 0.7 | 0.8 | 0.9 | 0.8 | 0.8 | 2.1 | 1.8 | 1.9 | 2.1 | 1.8 | 1.9 | 3.2 | 3 | 3 |
| 3/4” | 0.8 | 0.7 | 0.8 | 1.4 | 1.2 | 1.2 | 1.6 | 1.4 | 1.4 | 2.7 | 2.4 | 2.7 | 2.7 | 2.4 | 2.7 | 3.6 | 4 | 4.5 |
| 1” | 1.1 | 0.8 | 0.9 | 1.7 | 1.4 | 1.5 | 1.9 | 1.7 | 1.7 | 3.9 | 3.6 | 3.7 | 3.9 | 3.6 | 3.7 | 5.4 | 5 | 5 |
| 1.1/4” | 1.5 | 1.2 | 1.3 | 2.2 | 1.8 | 2 | 2.6 | 2.1 | 2.4 | 4.5 | 4.1 | 4.3 | 4.5 | 4.1 | 4.3 | 7.8 | 8 | 8 |
| 1.1/2” | 1.8 | 1.4 | 1.6 | 3.2 | 2.7 | 2.9 | 3.6 | 3.1 | 3.4 | 6.2 | 5.4 | 5.9 | 6.2 | 5.4 | 5.9 | 11.5 | 11 | 11 |
| 2” | 2.7 | 2.2 | 2.6 | 3.6 | 3.2 | 3.5 | 4.7 | 3.9 | 4.4 | 11.3 | 10.5 | 11.3 | 11.3 | 10.5 | 11.3 | 19 | 17 | 17 |
| 2.1/2” | 4.4 | 3.5 | 4.1 | 5.4 | 4.5 | 5.3 | 4.8 | 5.4 | 6.8 | 16.3 | 15.8 | 16 | 16.3 | 15.8 | 16 | 24 | 25 | 25 |
| 3” | 5.2 | 3.8 | 5.1 | 7.3 | 5.9 | 7.2 | 8.7 | 7.3 | 8.9 | 15 | 12.3 | 16.8 | 21 | 21.5 | 19.5 | 42.6 | 38 | 39 |
| 3-1/2” | 6.4 | 5 | 6.5 | 8.9 | 7.5 | 9.2 | 11.6 | 9 | 12.7 | – | – | – | – | – | – | – | – | – |
| 4” | 7.5 | 5.6 | 7.5 | 11.8 | 10 | 12.2 | 18.4 | 16.5 | 18.6 | 24 | 23.2 | 24.5 | 31.8 | 31 | 33 | 64 | 58 | 60 |
| 5” | 9.2 | 6.5 | 9.2 | 16 | 12.5 | 16 | 31 | 28.5 | 30.8 | 38.5 | 37.5 | 39.5 | 59 | 58.8 | 60 | 111 | 95 | 101 |
| 6” | 11.0 | 8.1 | 11.8 | 20.2 | 16.5 | 22 | 37 | 36.2 | 38 | 50 | 48.3 | 51.5 | 72 | 74 | 75 | 171 | 146 | 156 |
| 8” | 18.4 | 13 | 20.4 | 31.2 | 25.5 | 36 | 54.5 | 51.5 | 62.2 | 85 | 75 | 89 | 124 | 112 | 125 | 261 | 220 | 242 |
| 10” | 25.5 | 18.4 | 31 | 44.3 | 35 | 55 | 98.5 | 76.2 | 102 | 123 | 110 | 131 | 207 | 184 | 215 | 485 | 420 | 465 |
| 12” | 37 | 28.5 | 47 | 63.5 | 52 | 82.5 | 105 | 89.5 | 132 | 168 | 146 | 187 | 306 | 264 | 316 | 698 | 590 | 665 |
| 14” | 51 | 37.5 | 60 | 86 | 73 | 108 | 150 | 102 | 158 | 198 | 172 | 224 | 416 | – | – | – | – | – |
| 16” | 61.5 | 44.5 | 61 | 112 | 88 | 139 | 177 | 150 | 225 | 225 | 192 | 259 | 567 | – | – | – | – | – |
| 18” | 71.5 | 54 | 93 | 141 | 115 | 178 | 228 | 180 | 285 | 318 | 272 | 383 | 736 | – | – | – | – | – |
| 20” | 85 | 72 | 127 | 173 | 139 | 228 | 285 | 231 | 365 | 376 | 330 | 482 | 929 | – | – | – | – | – |
| 24” | 119 | 95 | 190 | 248 | 212 | 350 | 372 | 330 | 532 | 680 | 632 | 905 | 1504 | – | – | – | – | – |
Weld Neck Flange Dimensions
Weld neck flanges come in various sizes to fit different piping needs, with nominal pipe sizes (NPS) ranging from 1/2 inch to 24 inches or more. Key dimensions include outer diameter (OD), inner diameter (ID), bolt circle diameter (BCD), and bolt hole size and spacing, which are crucial for proper installation and alignment. Flange thickness and neck length vary based on pressure rating and pipe size, ensuring optimal strength and performance. Knowing these dimensions is essential for choosing the right weld neck flange for specific applications.
Weld Neck Flanges Uses
|
Application |
Description |
|
Petrochemical Plants |
Used in high-pressure and high-temperature environments for piping |
|
Oil and Gas Industry |
Commonly used in oil refineries, offshore platforms, and pipelines |
|
Power Generation |
Found in power plants for steam and water systems |
|
Chemical Industry |
Suitable for handling corrosive fluids and chemicals |
|
Shipbuilding |
Utilized in marine applications for pipelines and ship systems |
|
Food and Beverage |
Used in food processing and sanitary applications for fluid control |
|
HVAC Systems |
Found in heating, ventilation, and air conditioning systems |
|
Water Treatment |
Used for water distribution and treatment processes |
|
Pharmaceutical |
Suitable for pharmaceutical manufacturing and processing operations |
|
Aerospace |
Used in aircraft and aerospace applications for fluid and fuel systems |
FAQ’s About ASTM A106 Grade B Pipes
What is ASTM A106 Grade B pipe?
ASTM A106/A106M Grade B is a seamless carbon steel pipe specification intended for high-temperature service. The exact project suitability depends on the governing piping code, design conditions and purchase specification.
What is the difference between ASTM A106 Grade B and ASTM A53 Grade B?
ASTM A106 Grade B is a seamless high-temperature-service pipe specification. ASTM A53 Grade B covers welded and seamless pipe for mechanical and pressure applications and ordinary steam, water, gas and air service. Select the specification required by the project and design code.
What sizes does Kalpataru supply?
The current brief lists a Kalpataru supply range of 1/2 to 36 in NPS and Schedule 10 to XXS, subject to size and availability. ASTM A106/A106M itself has a wider standard scope.
What is the maximum temperature of ASTM A106 Grade B pipe?
Do not use one universal maximum temperature from the ASTM material specification. Allowable service depends on the design code, pressure, wall thickness, allowable stress and project conditions.
Is ASTM A106 Grade B seamless or welded?
ASTM A106/A106M is a seamless carbon steel pipe specification. Do not describe ERW, LSAW or other welded pipe as ASTM A106 product construction.
What tests are required for ASTM A106 Grade B pipe?
The specification includes mechanical testing and bend/flattening testing as applicable, together with hydrostatic and/or nondestructive electric testing requirements. The exact inspection package should match the current ASTM edition and purchase order.
What documents can be supplied?
Orders can be supplied with EN 10204 3.1 MTC and, where applicable and agreed, IBR documentation, third-party inspection and project-specific test reports.
How is ASTM A106 Grade B pipe priced?
Price depends on NPS, schedule or wall thickness, length, quantity, origin/mill, testing/certification, coating/end preparation and delivery destination. Send the full requirement for a size-wise quotation.
FAQs
What is the purpose of a welding neck flange?
A welding neck flange provides a strong, durable connection between pipes, ensuring smooth flow and reducing stress at the connection point, ideal for high-pressure and high-temperature applications.
What is the ASME standard for long weld neck flanges?
The ASME standard for long weld neck flanges is ASME B16.5.
Can two welding flanges be welded together?
Yes, two weld neck flanges can be welded together to create a secure and strong connection between pipes or components in a piping system.
What are the advantages of WNRF flanges?
Weld neck flanges offer strong, leak-proof connections, excellent stress distribution, and high resistance to pressure and temperature, making them ideal for critical applications in various industries.
