Weld Neck Flanges

  • Size: 1/2″ thru 24″ or custom size.
  • Material: Nickel Alloy,Hastelloy Alloy,Monel Alloy,Inconel Allo, Anti-Corrosion Resistant Alloy, Super-Alloy, Duplex Steel, Stainless steel, Titanium Alloy, Copper Alloy, Carbon Steel, Aluminium Steel, ect.
  • Standard: A WWA C207, ASME B16.5, DIN, BS, JIS, EN1092-1, ASME B16.47 and GOST/ГОСТ Standard, etc..
  • Approved by CE, RoHs, SGS, BV
  • Large stock with different sizes

Weld Neck Flanges Solutions

Weld neck flanges are a reliable and robust solution for demanding industry applications. To ensure the successful implementation and operation of these essential components, it’s crucial to consider factors such as materials, types, installation, maintenance, and additional considerations like standards, certifications, and safety. By understanding and addressing these aspects; you can choose the right weld neck flange solution and ensure its long-lasting performance and integrity in your piping system.

Table of Contents

Understanding your choice of weld neck flanges options

Choosing the right welding neck flanges for your application is crucial for the success of your project. By understanding the different weld neck flange options, materials, and factors to consider, you can make an informed decision. At Jihua, we offer a wide range of welding-neck flanges options, materials, and sizes to meet your specific application requirements. Contact us today to learn more about our products and services.

20230320085609 41779 - Weld Neck Flanges

What is a weld neck flange?

A weld neck flange, also known as a high hub flange or tapered hub flange, is a specialized type of pipe flange that is designed to be joined to piping systems by welding the pipe to the neck of the flange. These flanges are characterized by their long, tapered hub, which provides added reinforcement and helps to distribute stress over a larger area, reducing the risk of fatigue and failure.

Advantages of WN flanges

  • Superior Leak Prevention: Welded neck flanges provide superior sealing, reducing the potential for leaks in high-pressure and high-temperature systems. The tight connection between the flange and pipe helps maintain system integrity and minimizes potential downtime.

  • High load carrying capacity: Weld neck flanges are designed to withstand extreme loads for demanding applications in the power generation, petrochemical, oil, and gas industries.

  • Improved stress distribution: The extended neck design of weld neck flanges allows for a gradual transition between flange and pipe, reducing stress concentrations and improving the overall durability of the piping system.

  • Easy inspection and maintenance: The weld neck flange allows easy access to the piping system for inspection, cleaning, and maintenance, ensuring optimum system performance and minimizing downtime.

Types of Welding Neck Flanges

The following are the primary types of welding neck flanges:

  • Long weld neck flanges: long weld neck flanges are characterized by an extended neck, which provides added support and reinforcement for high-pressure applications. This type of flange is ideal for use in high-stress environments, such as those involving high temperatures, pressures, or bending forces. Long weld neck flanges are typically used in industries like petrochemical, oil and gas, and power generation.
  • Reducing weld neck flanges: reducing weld neck flanges, also known as reducer flanges, are designed to connect pipes with different diameters. These flanges feature a tapered neck, which allows for a smooth transition between the two pipe sizes, minimizing turbulence and ensuring optimal flow rates. Reducing weld neck flanges are commonly used in situations where pipe diameter changes are required, such as in process piping systems or water treatment facilities.
  • Heavy barrel weld neck flanges: heavy barrel weld neck flanges, also known as hbwn flanges, feature a thicker wall thickness and a larger hub diameter compared to standard weld neck flanges. This design provides increased strength and durability, making them suitable for high-pressure and high-temperature applications. Heavy barrel weld neck flanges are often used in the oil and gas, chemical, and power generation industries.
  • Expander weld neck flanges: expander weld neck flanges are designed to increase the pipe size, facilitating a transition from a smaller to a larger diameter. These flanges have a tapered neck that allows for a smooth flow transition, reducing turbulence and ensuring optimal flow rates. Expander weld neck flanges are commonly used in applications where an increase in pipe size is necessary, such as in pipelines or process systems.
  • Integral weld neck flanges: integral weld neck flanges, also known as nozzle neck flanges or self-reinforced flanges, are forged as a single piece with the pipe, eliminating the need for a separate weld. This design provides increased strength and leak resistance, making them ideal for high-pressure, high-temperature applications. Integral weld neck flanges are often used in the petrochemical, oil and gas, and power generation industries.

Standard for Welding Neck Flanges

The design and manufacturing of WN flanges are governed by the following standards:

  • ANSI B16.5 WN Flange
  • DIN WN Flange
  • EN 1092-1 WN Flange
  • BS 4504 WN Flange
  • UNI WN Flange
  • SANS 1123 WN Flange
  • GOST/ГОСТ 33259 WN Flange
  • ANSI B16.47 WN Flange
  • JIS B2220 WN Flange
  • KOREA WN Flange
  • BS 10 WN Flange
  • AWWA C207 WN Flange
  • IWN WN Flange
  • MSZ WN Flange
  • Australian WN Flange
  • French NFE WN Flange
  • Norwegian NS WN Flange

Materials of Welding Neck Flanges

Depending on the specific application requirements, weld neck flanges are made from a variety of metal materials, including:

Titanium weld neck flange ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1| R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Copper weld neck flange T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel weld neck flange ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Carbon Steel weld neck flange ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Stainless Steel weld neck flange ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Alloy Steel weld neck flange ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Hastelloy weld neck flange ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Brass weld neck flange 3602 / 2604 / H59 / H62 / etc.
Inconel weld neck flange ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750
Monel weld neck flange ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Duplex weld neck flange S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex weld neck flange S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Alloy 20 weld neck flange ASTM B462 / ASME SB462, Carpenter 20 Alloy, Alloy 20Cb-3
Aluminium weld neck flange 5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel weld neck flange ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Nimonic weld neck flange Nimonic 75, Nimonic 80A, Nimonic 90
Other weld neck flange material Tin bronze, Alumunum bronze, Lead bronze
Incoloy weld neck flange ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
254 Smo weld neck flange ASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547

Selecting the Right Weld Neck Flange Material

  • Material selection is crucial when choosing weld neck flanges for your piping system. Factors to consider include corrosion resistance, temperature, and pressure requirements. Common materials used for weld neck flanges include:
  • Carbon Steel: Offers excellent strength and durability, making it suitable for high-pressure applications.
  • Stainless Steel: Provides outstanding corrosion resistance, making it ideal for use in harsh environments or applications where chemical compatibility is essential.
  • Alloy Steel: Delivers enhanced resistance to heat and corrosion, making it suitable for high-temperature and high-pressure environments.
  • Nickel Alloys: Offer superior corrosion and heat resistance, as well as excellent mechanical properties, making them suitable for use in demanding applications such as aerospace, power generation, and petrochemical industries.

Dimensions of Welding Neck Flanges

The size and dimensions of the weld neck flange must be compatible with the piping system’s components. Ensure that the flange’s nominal pipe size (NPS), outer diameter (OD), and bolt circle diameter (BCD) match the corresponding specifications of the connected equipment.

Dimensions of ASME B16.5 Weld Neck Flanges

ASME B16.5 standard weld neck flanges are available in 1/2” to 24” nominal sizes and in pressure of Class 150#, 300#, 600#, 900#, 1500#, and 2500#. There are many seals facing as Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue-and-Groove (T&G), and Male-and-Female (M&F).

ASME B16.5 Weld Neck Flange Drawing - Weld Neck Flanges

Weld Neck Flanges Class 150 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 89 15.7 4 11.2 47.8 30.2 21.3 35.1 0.5
3/4″ 99 20.8 4 12.7 52.3 38.1 26.7 42.9 0.9
1″ 108 26.7 4 14.2 55.6 49.3 33.5 50.8 1.1
1-1/4″ 117 35.1 4 15.7 57.2 58.7 42.2 63.5 1.4
1-1/2″ 127 40.9 4 17.5 62 65 48.3 73.2 1.8
2″ 152 52.6 4 19.1 63.5 77.7 60.5 91.9 2.8
2-1/2″ 178 62.7 4 22.4 69.9 90.4 73.2 104.6 4.3
3″ 191 78 4 23.9 69.9 108 88.9 127 5.2
3-1/2″ 216 90.2 8 23.9 71.4 122.2 101.6 139.7 5.5
4″ 229 102.4 8 23.9 76.2 134.9 114.3 157.2 7.3
5″ 254 128.3 8 23.9 88.9 163.6 141.2 185.7 8.9
6″ 279 154.2 8 25.4 88.9 192 168.4 215.9 11.3
8″ 343 202.7 8 28.4 101.6 246.1 219.2 269.7 18.1
10″ 406 254.5 12 30.2 101.6 304.8 273.1 323.9 25.0
12?” 483 304.8 12 31.8 114.3 365.3 323.9 381 39.0
14″ 533 336.6 12 35.1 127 400.1 355.6 412.8 51.7
16″ 597 387.4 16 36.6 127 457.2 406.4 469.9 64.5
18″ 635 438.2 16 39.6 139.7 505 457.2 533.4 75.0
20″ 699 489.0 20 42.9 144.5 558.8 508 584.2 89.5
24″ 813 590.6 20 47.8 152.4 663.4 609.6 692.2 120
Weld Neck Flanges Class 300 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 95 15.7 4 14.2 52.3 38.1 21.3 35.1 0.8
3/4″ 117 20.8 4 15.7 57.2 47.8 26.7 42.9 1.4
1″ 124 26.7 4 17.5 62 53.8 33.5 50.8 1.6
1-1/4″ 133 35.1 4 19.1 65 63.5 42.2 63.5 2.1
1-1/2″ 155 40.9 4 20.6 68.3 69.9 48.3 73.2 3.1
2″ 165 52.6 8 22.1 69.9 84.1 60.5 91.9 3.5
2-1/2″ 191 62.7 8 25.4 76.2 100.1 73.2 104.6 5.3
3″ 210 78 8 28.4 79.2 117.3 88.9 127 7.3
3-1/2″ 229 90.2 8 30.2 81 133.4 101.6 139.7 8.2
4″ 254 102.4 8 31.8 85.9 146.1 114.3 157.2 11.3
5″ 279 128.3 8 35.1 98.6 177.8 141.2 185.7 15.1
6″ 318 154.2 12 36.6 98.6 206.2 168.4 215.9 20.0
8″ 381 202.7 12 41.1 1 260.4 219.2 269.7 30.5
11.3
10″ 445 254.5 16 47.8 117.3 320.5 273.1 323.9 4.8
12″ 521 303.2 16 50.8 130 374.7 323.9 381 64.5
14″ 584 333.3 20 53.8 142.7 425.5 355.6 412.8 88.3
16″ 648 381 20 57.2 146.1 482.6 406.4 469.9 115.0
18″ 711 428.7 24 60.5 158.8 533.4 457.2 533.4 143.0
20″ 775 477.8 24 63.5 162.1 587.2 508 584.2 175.0
24″ 914 575 24 69.9 168.1 701.5 609.6 692.2 260.0
Weld Neck Flanges Class 600 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 95 15.7 4 14.2 52.3 38.1 21.3 35.1 1.0
3/4″ 117 20.8 4 15.7 57.2 47.8 26.7 42.9 1.6
1″ 124 26.7 4 17.5 62 53.8 33.5 50.8 2.2
1-1/4″ 133 35.1 4 20.6 66.5 63.5 42.2 63.5 2.8
1-1/2″ 155 40.9 4 22.4 69.9 69.9 48.3 73.2 3.8
2″ 165 52.6 8 25.4 73.2 84.1 60.5 91.9 4.5
2-1/2″ 191 62.7 8 28.4 79.2 100.1 73.2 104.6 8.2
3″ 210 78 8 31.8 82.6 117.3 88.9 127 8.8
3-1/2″ 229 90.2 8 35.1 85.9 133.4 101.6 139.7 12.0
4″ 273 102.4 8 38.1 101.6 152.4 114.3 157.2 17.0
5″ 330 128.3 8 44.5 114.3 189 141.2 185.7 31.0
6″ 356 154.2 12 47.8 117.3 222.3 168.4 215.9 37.0
8″ 419 202.7 12 55.6 133.4 273.1 219.2 269.7 55.0
10″ 508 254.5 16 63.5 152.4 342.9 273.1 323.9 90.0
12″ 559 303.2 20 66.5 155.4 400.1 323.9 381 110.0
14″ 603 333.3 20 69.9 165.1 431.8 355.6 412.8 127.0
16″ 686 381 20 76.2 177.8 495.3 406.4 469.9 177.1
18″ 743 428.4 20 82.6 184.2 546.1 457.2 533.4 215.65
20″ 813 477.8 24 88.9 190.5 609.6 508 584.2 267.9
24″ 940 575 24 101.6 203.2 717.6 609.6 692.2 372.0
Weld Neck Flanges Class 900 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 121 15.7 4 22.4 60.5 38.1 21.3 34.9 1.9
3/4″ 130 20.8 4 25.4 69.9 44.5 26.7 42.9 2.6
1″ 149 26.7 4 28.4 73.2 52.3 33.5 50.8 3.8
1-1/4″ 159 35.1 4 28.4 73.2 63.5 42.2 63.5 4.3
1-1/2″ 178 40.9 4 31.8 82.6 69.9 48.3 73 6.0
2″ 216 52.6 8 38.1 101.6 104.6 60.5 92.1 10.8
2-1/2″ 244 62.7 8 41.1 104.6 124 73.2 104.8 15.0
3″ 241 78 8 38.1 101.6 127 88.9 127 13.7
4″ 292 102.4 8 44.5 114.3 158.8 114.3 157.2 22.5
5″ 349 128.3 8 50.8 127 190.5 141.2 185.7 37.4
6″ 381 154.2 12 55.6 139.7 235 168.4 215.9 47.7
8″ 470 202.7 12 63.5 162.1 298.5 219.2 269.9 81.3
10″ 546 254.5 16 69.9 184.2 368.3 273.1 323.8 119.0
12″ 610 304.8 20 79.2 200.2 419.1 323.9 381 157.0
14″ 641 336.6 20 85.9 212.9 450.9 355.6 412.8 180.0
16″ 705 387.1 20 88.9 215.9 508 406.4 469.9 217.0
18″ 787 438.2 20 101.6 228.6 565.2 457.2 533.4 292.0
20″ 857 489 20 108 247.7 622.3 508 584.2 362.0
24″ 1041 590.6 20 139.7 292.1 749.3 609.6 692.2 665.0
Weld Neck Flanges Class 1500 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 121 15.7 4 22.4 60.5 38.1 21.3 34.9 1.9
3/4″ 130 20.8 4 25.4 69.9 44.5 26.7 42.9 2.6
1″ 149 26.7 4 28.4 73.2 52.3 33.5 50.8 3.8
1-1/4″ 159 35.1 4 28.4 73.2 63.5 42.2 63.5 4.3
1-1/2″ 178 40.9 4 31.3 82.6 69.9 48.3 73 6.0
2″ 216 52.6 8 38.1 101.6 104.6 60.5 92.1 10.8
2-1/2″ 244 62.7 8 41.1 104.6 124 73.2 104.3 150.0
3″ 267 78 8 47.3 117.3 133.4 88.9 127 20.0
4″ 311 102.4 8 53.8 124 162.1 114.3 157.2 30.0
5″ 375 128.3 8 73.2 155.4 196.9 141.2 185.7 55.5
6″ 394 154.2 12 82.6 171.5 228.6 168.4 215.9 68.5
8″ 483 202.7 12 91.9 212.9 292.1 219.2 269.9 117.0
10″ 584 254.5 12 108 254 368.3 273.1 323.8 194.0
12″ 673 304.8 16 124 282.4 450.9 323.9 381 288.0
14″ 749 336.6 16 133.4 298.5 495.3 355.6 412.8 380.0
16″ 826 387.1 16 146.1 311.2 552.5 406.4 469.9 485.0
18″ 914 438.2 16 162.1 327.2 596.9 457.2 533.4 644.0
20″ 984 489 16 177.8 355.6 641.4 508 584.2 775.0
24″ 1168 590.6 16 203.2 406.4 762 609.6 692.2 1232.0
Weld Neck Flanges Class 2500 LBS Dimensions
NPS A B1 Holes T1 D X A G Weight
1/2″ 121 15.7 4 22.4 60.5 38.1 21.3 34.9 3.1
3/4″ 130 20.8 4 25.4 69.9 44.5 26.7 42.9 3.7
1″ 149 26.7 4 28.4 73.2 52.3 33.5 50.8 5.3
1-1/4″ 159 35.1 4 28.4 73.2 63.5 42.2 63.5 7.8
1-1/2″ 178 40.9 4 31.3 82.6 69.9 48.3 73 10.9
2″ 216 52.6 8 38.1 101.6 104.6 60.5 92.1 16.2
2-1/2″ 244 62.7 8 41.1 104.6 124 73.2 104.3 23.7
3″ 267 78 8 47.3 117.3 133.4 88.9 127 36.2
4″ 311 102.4 8 53.8 124 162.1 114.3 157.2 55.3
5″ 375 128.3 8 73.2 155.4 196.9 141.2 185.7 92.5
6″ 394 154.2 12 82.6 171.5 228.6 168.4 215.9 143.0
8″ 483 202.7 12 91.9 212.9 292.1 219.2 269.9 215.0
10″ 584 254.5 12 108 254 368.3 273.1 323.8 406.0
12″ 673 304.8 16 124 282.4 450.9 323.9 381 572.0

Dimensional Tolerance Welding Neck Flange

Certificate Plate thickness in mm Width in mm Length in mm
Outside Diameter When O is 24″ or less. When O is over 24″. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm
Diameter of Contact Face 0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face. ±0.03″ ±0.02″ ±0.8 mm ±0.5mm
Diameter of Hub at Point of Welding NPS 5 and smaller. NPS 6 and larger. +0.09″, -0.03″ +0.16″, -0.03″ +2.4 mm, -0.8mm +4.0 mm, -0.8 mm
Inside Diameter NPS 10, 12, 18, 20 and larger. +0.03″ +0.06″ +0.12″, -0.06″ +0.8 mm +1.6 mm +3.2 mm, -1.6 mm
Diameter of Hub at Base Hub Base is 24″or less. Hub Base is over 24″. +0.06″ +0.12″ +1.6 mm +3.2 mm
Thickness NPS 18 and smaller. NPS 20 and larger. +0.12″ +0.19″ +3.2 mm +4.8 mm
Drilling and Facings Bolt circle diameter Bolt Hole Spacing ±0.06″ ±0.03″ ±1.6 mm ±0.8 mm
Eccentricity of Bolt Circle and Facing NPS 2 1/2 and smaller. NPS 3 and larger. ±0.03″ ±0.06″ ±0.8 mm ±1.6 mm
Length Through Hub NPS 10 and smaller. NPS 12 and larger. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm

Dimensions of ASME B16.47 Series B Weld Neck Flange/WN Flange

ASME B16.5 Welding Neck Flanges Class 150LBS Dimensions - Weld Neck Flanges

ASME B16.47 Series B Welding Neck Flanges Class 150/300 LBS Dimensions

ASME B16.47 Series B Welding Neck Flanges Class 150 LBS Dimensions
NPS A B I Holes C D F E G Weight
26″ 786 635 22.4 36 41.1 88.9 684.3 661.9 711.2 63.56
28″ 837 685.8 22.4 40 44.5 95.3 735.1 712.7 762 73.5
30″ 887 736.6 22.4 44 44.5 100.1 787.4 763.5 812.8 80.05
32″ 941 787.4 22.4 48 46 108 839.7 814.3 863.6 91.76
34″ 1005 838.2 25.4 40 49.3 110.2 892 865.1 920.8 110.27
36″ 1057 889 25.4 44 52.3 117.3 944.6 915.9 971.6 124.91
38″ 1124 939.8 28.4 40 53.8 124 997 968.2 1022.4 149.17
40″ 1175 990.6 28.4 44 55.6 128.5 1049.3 1019 1079.5 162.58
42″ 1226 1041.4 28.4 48 58.7 133.4 1101.9 1069.8 1130.3 179.18
44″ 1276 1092.2 31.8 52 60.5 136.7 1152.7 1120.6 1181.1 187.51
46″ 1341 1143 31.8 40 62 144.5 1205 1171.4 1234.9 223.84
48″ 1392 1193.8 31.8 44 65 149.4 1257.3 1222.2 1289.1 243.46
50″ 1443 1244.6 31.8 48 68.3 153.9 1308.1 1273 1339.9 263.22
52″ 1494 1295.4 31.8 52 69.9 157.2 1360.4 1323.8 1390.7 279.95
54″ 1549 1346.2 31.8 56 71.4 162.1 1412.7 1374.6 1441.5 303.62
56″ 1600 1397 31.8 60 73.2 166.6 1465.3 1425.4 1492.3 323.64
58″ 1675 1447.8 35.1 48 74.7 174.8 1516.1 1476.2 1543.1 383.77
60″ 1726 1498.6 35.1 52 76.2 179.3 1570 1527 1600.2 407.55
ASME B16.47 Series B Welding Neck Flanges Class 300 LBS Dimensions
NPS A B I Holes C D F E G Weight
26″ 867 635 35.1 32 88.9 144.5 701.5 665.2 736.6 189.56
28″ 921 685.8 35.1 36 88.9 149.4 755.7 716 787.4 207.56
30″ 991 736.6 38.1 36 93.7 158 812.8 768.4 844.6 254.27
32″ 1054 787.4 41.1 32 103.1 168.1 863.6 819.2 901.7 310.53
34″ 1108 838.2 41.1 36 103.1 173 917.4 870 952.5 333.98
36″ 1172 889 44.5 32 103.1 180.8 965.2 920.8 1009.7 374.99
38″ 1222 939.8 44.5 36 111.3 192 1016 971.6 1060.5 51.95
40″ 1273 990.6 44.5 40 115.8 198.4 1066.8 1022.4 1114.6 55.97
42″ 1334 1041.4 47.8 36 119.1 204.7 1117.6 1074.7 1168.4 508.46
44″ 1384 1092.2 47.8 40 127 214.4 1173.2 1125.5 1219.2 69.03
46″ 1461 1143 50.8 36 128.5 222.3 1128.9 1176.3 1270 12.74
48″ 1511 1193.8 50.8 40 128.5 223.8 1277.9 1227.1 1327.2 678.19
50″ 1562 1244.6 50.8 44 138.2 235 1330.5 1277.9 1378 90.66
52″ 1613 1295.4 50.8 48 142.7 242.8 1382.8 1328.7 1428.8 98.74
54″ 1673 1346.2 50.8 48 136.7 239.8 1435.1 1379.5 1479.6 829.33
56″ 1765 1397 60.5 36 153.9 268.2 1493.8 1422.4 1536.7 122.93
58″ 1827 1447.8 60.5 40 153.9 274.6 1547.9 1481.1 1593.9 147.04
60″ 1878 1498.6 60.5 40 150.9 271.5 1598.7 1531.9 1651 1201.14
ASME B16.5 Welding Neck Flanges Class 400 LBS Dimensions - Weld Neck Flanges

ASME B16.47 Series B Welding Neck Flanges Class 400-900 LBS Dimensions

ASME B16.47 Series B Welding Neck Flanges Class 400 LBS Dimensions
NPS A B I Holes C D F E G Weight
26″ 850.9 635 38.1 28 88.9 149.35 688.85 660.4 711.2 165.95
28″ 914.4 685.8 41.15 24 95.25 158.9 739.65 711.2 762 204.49
30″ 971.55 736.6 41.15 28 101.6 169.93 793.75 762 819.15 239.2
32″ 1035.1 787.4 44.45 28 107.95 179.32 844.55 812.8 873.25 283.06
34″ 1085.9 838.2 44.45 32 111.25 187.45 898.65 863 927.1 307.92
36″ 1155.7 889 47.75 28 119.13 200.15 952.5 914.4 980.95 381.98
ASME B16.47 Series B Welding Neck Flanges Class 600 LBS Dimensions
NPS A B I Holes C D F E G Weight
26″ 889 635 44.45 28 111.25 180.85 698.5 660.4 726.95 244.55
28″ 952.5 685.8 47.75 28 115.82 190.5 752.35 711.2 784.35 287.49
30″ 1022.4 736.6 50.8 28 125.48 204.72 806.45 762 841.25 358.02
32″ 1085.9 787.4 53.85 28 130.05 215.9 860.55 812.8 895.35 414.01
34″ 1162.1 838.2 60.45 24 141.22 233.43 914.4 863.6 952.5 523.71
1212.9 889 60.45 28 146.05 242.82 968.25 914.4 1009.7 564.36
ASME B16.47 Series B Welding Neck Flanges Class 900 LBS Dimensions
NPS A B I Holes C D F E G Weight
26″ 1022.4 635 66.55 20 134.87 258.83 742.95 660.4 762 513.64
28″ 1104.9 685.8 73.15 20 147.57 276.35 797.05 711.2 819.15 646.22
30″ 1181.1 736.6 79.25 20 155.45 289.05 850.9 762 876.3 765.72
32″ 1238.3 787.4 79.25 20 160.27 303.28 908.05 812.8 927.1 863.06
34″ 1314.5 838.2 85.85 20 171.45 319.02 962.15 863.6 990.6 1023.53
36″ 1346.2 889 79.25 24 172.97 325.37 1016 914.4 1028.7 1038.21

Manufacturing process of Welding Neck Flanges

manufacturing process of welding neck flanges - Weld Neck Flanges
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Welding Neck Flanges can be produced by forging, casting. We mainly produce flanges by forging, cutting and rolling processes. We will take you through the step-by-step process of manufacturing weld neck flanges, from the materials used to the final product.

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The following type of flange was selected for the qualification. Using the above introduced materials, flanges were manufactured by hummer die forging.

Flange type: 900lbs. 14B WN RF Sch.80 (φ640 x φ318 x H220)

Step 1: Material Selection

The first step in our manufacturing process is material selection. The raw material of the flange is round bar or steel ingot. Billet diameter of F51/F60 was 300 mm and F53 was 350 mm respectively. The billets were cut into blocks of individual weight of 346 kg. We use only the highest quality materials, including carbon steel, stainless steel, and alloy steel. Each material has its own unique properties and is selected based on the specific needs of the customer.

Step 2: Cutting

Once the materials are selected, they are cut to the desired size using a cutting machine. We use state-of-the-art cutting machines to ensure precision and accuracy in every cut.

Step 3: Heating

After the materials are cut, they are heated to the desired temperature. This helps to reduce any stresses in the material and makes it easier to shape the flange.

Step 4: Forging

The flanges were manufactured by closed die forging. The forging was performed by two hummers installed in a domestic forging company according to our order requirements. Table 2 shows the forging conditions and Figure 1 shows the pictures of each forging stage.
The forging operation of F51/F60 needed three heats and F53 needed four heats. After forging, the products were quenched immediately in the water. No defect was found on the surface of the products.
Table.1 Chemical compositions (wt%)

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Table.2 Hot working conditions

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Figure. Forging process

Step 5: Forming

The next step in our manufacturing process is forming the flange. We use a hydraulic press to shape the heated material into the desired shape. This ensures that each flange is formed with precision and accuracy.

Step 6: Heat treatment

Verification test of the furnace

Before the solution treatment of the flanges, a verification test was carried out in order to confirm the temperature distribution in the furnace. Twenty five (25) dummy flanges were prepared for the test as shown in Figure 2. The measurement result using several thermo couples on the dummy flanges is shown in Figure 3. According to the temperature chart, the maximum temperature difference from target temperature during annealing stage is seven (7) degrees. This means that the furnace is well controlled as a furnace for the solution treatment of stainless steel products.

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Figure.2 Dummy flanges for verification

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Figure.3 Temperature record chart

Solution treatment of the flanges

Solution treatment was made after forging. Heat cycle is shown in the following: 1,050 ℃ x 2 hours → water quenching.

Surface temperature was monitored at three points of the flange during annealing. All temperature ranges were met within 1,050 ± 7℃ which was satisfactory to standard.

Moreover standard requires that the duration from furnace into quenching bath shall be less than 60sec and the water temperature of the bath shall be below 50℃. According to the measurement results during the quenching, it was confirmed that the transferring time was 53sec and the water temperature was kept under 50℃.

Step 7: Machining

Following the solution treatment, a flange of each material was finished by machining.
There was no difficulty when machining.

After finishing, the penetrant testing (PT) was carried out. No surface defect was found.

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Figure.4 and Figure.5 shows the appearance of F51/F60 flange after PT.

Step 8: Investigations of properties

The following investigations were carried out according to standards:

  • 1) Tensile test

  • 2) Impact test

  • 3) Corrosion test

  • 4) Microstructure observation

  • 5) Ferrite content

  • 6) Hardness (only for F53)

Sampling locations except hardness measurement are indicated in Figure 5.

Position 1 is specified at middle of hub and position 2 at middle of flange respectively.

Tensile test
Tensile test results at room temperature are shown in Table 3. At every position, properties are satisfactory to the requirements of standards.
Table.3 Tensile test results

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Impact test
Charpy 2mm V-notch tests were carried out at -46 C. Sampling locations were pos. 1 and pos.2 as shown in Figure 5. At each location, the specimens were sampled in axial and tangential directions.
The results are shown in Table 4 with requirements of standards. All results meet the requirements successfully.
However, in the case of F51/F60 material, the results in axial direction at pos.2 are just above the minimum requirements. Therefore further study will be desired in order to increase the impact toughness in this condition.
Table.4 Impact test results

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Corrosion test
Corrosion tests were carried out according to ASTM G48 Method A- Ferric Chloride Pitting Test using the specimens sampled at pos.1 and pos.2. Testing conditions were 25 °C x 24 hrs for F51/F60 and 50 °C x 24 hrs for F53 respectively. Table 5 shows the size of specimens and the test results of weight loss. As shown in the table, corrosion resistance of these materials are quite satisfactory.
Table.5 Corrosion test results

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Microstructure
Microstructure observation was made at the location of pos.1 and pos.2. As shown in Figure 6, every structure is austenite and ferrite duplex structure. Secondary austenite is observed in both materials however no intermetallic phase is found.

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Figure.6 Microstructure

Ferrite content
Table 6 shows the results of ferrite content measurement. AlI of them are between 35 – 55 % which is required by standards. Ferrite content of F53 is less than F51/F60.

Table.5 Ferrite Content

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Hardness
Hardness measurement was made only for F53 flange because ASTM A182 requires hardness range to be maximum HB300 for F53 material. All of the results at twenty five (25) points of the radial section were between HB 238 – 260 which meet ASTM requirement. Since specifes no hardness requirement, this measurement is reference only.

Step 9: Qualification

Qualification of the flanges

As reported above, all the properties satisfied the requirements of standards. Based on these investigation data the flanges made of F51/F60 and F53 materials were qualified.

Step 10: Packaging and Delivery

Finally, the flange is packaged and prepared for delivery to the customer. We take great care in packaging our products to ensure that they arrive at their destination in pristine condition.

At Jihua, we take great pride in our manufacturing process of weld neck flanges. We are committed to producing high-quality flanges that meet the needs of our customers. Contact us today to learn more about our products and services.

Marking of Welding Neck Flanges

The marking of weld neck flanges is essential to their manufacture and use. The marking aims to provide information about the flange’s material, size, pressure rating, and other relevant details.

Welding Neck Flanges are typically marked by industry standards, such as ASME B16.5 or EN 1092-1. These standards specify the required information that must be included on the flange, as well as the format and location of the markings.

The required information typically includes the following:
  • Flange size
  • Pressure rating
  • Material specification
  • Tag number
  • Manufacturer’s name or trademark
  • Heat number or lot number
  • Date of manufacture

The standard also specifies the location of the marking on the flange. Typically, the marking is placed on the raised face of the flange near the bolt holes. In some cases, the marking may be located on the flange hub or the plate itself.

Packing of Welding Neck Flanges

How to package weld neck flanges? To pack the weld neck flange, follow these steps:

When it comes to packaging weld neck flanges, it’s important to ensure that they are properly protected and secured during transportation to prevent any damage. We will walk you through some of the key steps to follow when packaging weld neck flanges.

Step 1: Clean and Inspect the Flanges

Before packaging the weld neck flanges, it’s essential to clean them thoroughly to remove any dust, dirt, or debris that may have accumulated on them. You can use a cloth or brush to clean the flanges and inspect them to ensure they are free from any defects or damages.

Step 2: Choose the Right Packaging Material

The packaging material you choose should be sturdy and able to provide adequate protection to the flanges during transportation. Ideally, you should use a strong cardboard box or wooden crate that can withstand the weight and size of the weld neck flanges.

Step 3: Secure the Flanges

Once you have the packaging material ready, you need to secure the flanges to prevent them from moving around or getting damaged during transit. You can use bubble wrap, foam, or any other suitable cushioning material to protect the weld neck flanges from impact or shock.

Step 4: Label the Package

Labeling the package correctly is crucial to ensure that it reaches the intended destination without any confusion. You should clearly label the package with the recipient’s address, contact information, and any other necessary details.

Step 5: Arrange for Shipping

After the package is fully prepared and labeled, it’s time to arrange for shipping. You can use a reliable courier or shipping company to ensure that the package is delivered on time and in good condition.

Packaging weld neck flanges requires careful planning and attention to detail. By following the above steps, you can ensure that your flanges are properly protected and arrive at their destination safely. Remember to use high-quality packaging materials, secure the weld neck flanges properly, and label the package accurately to avoid any mishaps during transportation.
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Inspection and measurement of Welding Neck Flanges

There are several factors that need to be considered when inspecting and measuring weld neck flanges, including:

Material

The first thing to inspect in a weld neck flange is the material. The standard specifies that the flanges should be made from materials such as carbon steel, stainless steel, or alloy steel. The material should be free from any defects such as cracks, porosity, or inclusions that can affect the integrity of the flange.

Dimension

The next thing to inspect in a weld neck flange is its dimension. The standard specifies the dimensions of the flanges based on their nominal size and pressure rating. The flanges should be inspected for their inside and outside diameter, thickness, and overall dimensions to ensure they meet the requirements of the standard.

Surface Finish

The surface finish of a flange is also important. The standard specifies that the flanges should have a smooth and even surface finish to ensure proper sealing of the gasket. Any roughness or irregularities on the surface of the flange can lead to leaks in the piping system.

Bolt Hole Alignment

The bolt holes in a flange should be aligned properly to ensure the bolts can be inserted and tightened correctly. The bolt holes should be inspected to ensure they are in the correct position and are not misaligned.

Bolt Hole Size

The size of the bolt holes is also important. The standard specifies the size of the bolt holes based on the nominal size and pressure rating of the flange. The bolt holes should be inspected to ensure they are the correct size and are not damaged.

Bolt Hole Thread

The threads in the bolt holes are important to ensure the bolts can be screwed in and tightened properly. The threads should be inspected to ensure they are clean and free from any damage or defects.

To inspect and measure weld neck flanges, you will need a set of calipers or a micrometer to accurately measure the dimensions of the flange. It is also a good idea to have a torque wrench on hand to ensure that the bolts are tightened to the correct torque specification.

Weld Neck Flanges Installation Process

  • Pipe Preparation: Ensure the pipe end is clean, free of debris, and has a smooth, beveled edge to facilitate a proper weld.

  • Flange Alignment: Align the weld neck flange with the pipe, ensuring that the bolt holes are properly oriented and the flange face is parallel to the pipe end.

  • Tack Welding: Secure the flange in place with small, temporary welds, known as tack welds. These welds maintain the flange’s alignment with the pipe during the welding process.

  • Welding: Perform a full-penetration, butt-weld between the pipe and the weld neck flange, ensuring a strong, leak-free connection.

  • Inspection and Testing: Inspect the weld for any defects or inconsistencies, and conduct pressure testing to verify the integrity of the connection.

Application of Welding Neck Flanges

ASME B16.5 Welding Neck Flanges are known to deliver exceptional performance and are generally developed to meet the demands. We offer a broad range of Welding Neck Flanges through a worldwide network of stock-keeping branches.

This Welding Neck Flange is used in various industries:

  • Welding Neck Flanges used in Oil and Gas Pipelines;

  • Welding Neck Flanges used in Chemical Industry;

  • Welding Neck Flanges used in Plumbing;

  • Welding Neck Flanges used in Heating;

  • Weld Neck Flanges used in Water Supply Systems;

  • Welding Neck Flanges used in Power Plants;

  • Welding Neck Flanges used in the Paper & Pulp Industry;

  • Welding Neck Flange uses in General Purpose Applications;

  • Welding Neck Flanges used in Fabrication Industry;

  • Welding Neck Flange uses in Food Processing Industry;

  • Welding Neck Flanges Use in Structural Pipe.

Slip-On Flanges VS Weld Neck Flanges

Welding-neck flanges and weld neck flanges have some similarities and differences, as shown below:

Features Slip-On Flanges Weld Neck Flanges
Installation Easy to install Difficult to install
Strength Not as strong as weld neck flanges Strong and reliable
Pressure Suitable for low-pressure applications Suitable for high-pressure applications
Cost Less expensive More expensive
Disassembly Suitable for frequent disassembly Not suitable for frequent disassembly
Thermal Expansion Not suitable for systems where thermal expansion or contraction is a concern Suitable for systems where thermal expansion or contraction is a concern

How to purchase the correct weld neck flanges?

Are you in the market for weld neck flanges but don’t know where to start? Don’t worry, you’re not alone. With so many options available, it can be overwhelming to choose the right flanges for your project. We’ll go over some key factors to consider when purchasing weld neck flanges to ensure that you make the right decision.

Determine the Material Needed

The first step to purchasing the correct weld neck flanges is to determine the material you need. These flanges are available in a variety of materials, including carbon steel, stainless steel, and alloy steel. The choice of material will depend on the specific application and environmental conditions. If you’re unsure which material to choose, consult with a qualified engineer or supplier to help guide you in making the right decision.

Identify the Flange Face Type

Flange face types refer to the surface finish of a flange, and there are many different types of flange face finishes, including flat face (FF), raised face (RF), ring-type joint (SO), tongue and groove (T&G), male and female face (M&F). Each type of flange face has its unique characteristics and is suitable for different applications.
  • Flat face (FF): This type of flange face has a flat, smooth surface that is perpendicular to the axis of the pipe. It is typically used for low-pressure applications and when the sealing is achieved by a gasket.
  • Raised face (RF): This type of flange face has a raised ring on the surface that surrounds the bolt holes. The ring provides a surface for the gasket to rest on, which helps to create a better seal. It is commonly used in applications with moderate pressure.
  • Ring joint face (RTJ): This type of flange face has a specially designed groove to accommodate a metallic ring gasket. The groove is cut into the surface of the flange, and the gasket sits in the groove to create a tight seal. This type of flange face is typically used in high-pressure applications.
  • Tongue and groove face (T&G): This type of flange face has a raised tongue on one flange and a matching groove on the other flange. The tongue fits into the groove, creating a tight seal without the need for a gasket. This type of flange face is often used in applications where high pressure and temperature are involved.
  • Male and Female Face (M&F): This type of flange face is similar to the tongue and groove face. However, it has a male and female end which creates a face to face contact between two flanges. This type of flange is mainly used for low pressure and low temperature applications.

To identify a specific flange face type, you need to provide me with more information, such as the flange’s application, dimensions, and material.

Determine the WN flange Size and Pressure Class

Once you have identified the material and weld neck flange type, the next step is to determine the size and pressure class of the weld neck flange. weld neck flanges are available in various sizes and pressure ratings, and it’s crucial to select the correct size and pressure class to ensure that the flange can withstand the intended operating conditions. You should consult the system specifications and design to determine the appropriate size and pressure class.

Surface Finish

The flange face’s surface finish directly impacts the seal’s quality between the flanges. Common surface finishes include smooth, serrated, and grooved. Consult with the gasket manufacturer and consider the specific requirements of your application to select the most appropriate surface finish for your weld neck flanges.

Look for Quality and Certifications

It’s essential to ensure that the weld neck flanges you purchase are of high quality and come with the necessary certifications. Look for suppliers that have a reputation for delivering high-quality products, and check for relevant certifications, such as ISO 9001, API, and CE, to ensure that the flanges meet industry standards.

Consider the Price

While the price should not be the only factor to consider when purchasing weld neck flanges, it’s important to compare prices from different suppliers to ensure that you’re getting a fair price. However, remember that the cheapest option may not always be the best quality, so ensure that you’re not compromising on quality in pursuit of lower costs.

Purchasing the correct weld neck flanges can be challenging, but by considering the factors outlined in this post, you can ensure that you make an informed decision that meets your project requirements. Remember to consult with experts and compare suppliers to ensure that you’re getting a high-quality product at a fair price.

How to select weld neck flanges manufacturer?

Selecting the right manufacturer for weld neck flanges can be a daunting task. With so many options available, it’s easy to get overwhelmed and make the wrong choice. However, choosing the right manufacturer is critical to ensure that you get the best quality flanges that meet your specific needs. We provide some tips to help you select the right weld neck flanges manufacturer.

Quality of Products

The first factor to consider when selecting a weld neck flanges manufacturer is the quality of their products. You should look for a manufacturer that uses high-quality materials and follows strict quality control processes to ensure that their products meet the required standards.

Industry Experience

Another factor to consider is the manufacturer’s industry experience. Look for a manufacturer that has been in the industry for a significant period and has a proven track record of delivering high-quality products to their customers. An experienced manufacturer will have a better understanding of the market and the needs of their customers.

Production Capacity

It is also essential to consider the production capacity of the manufacturer. You should look for a manufacturer that has the capacity to produce the required quantity of flanges in a timely manner to meet your project’s needs.

Pricing

Pricing is another crucial factor to consider when selecting a weld neck flanges manufacturer. While it is essential to look for a manufacturer that offers competitive pricing, it is equally important to consider the quality of their products. Don’t compromise on the quality of the products for the sake of saving a few dollars.

Customer Service

The final factor to consider is the manufacturer’s customer service. Look for a manufacturer that has excellent customer service and is willing to assist you with any queries or concerns you may have. A manufacturer that values their customers will provide a better overall experience.

Choosing the right weld neck flanges manufacturer is essential to ensure you get high-quality products that meet your needs. Look for a manufacturer with quality certifications, experience, a good reputation, customization capabilities, and a competitive price. By following these tips, you will be able to find the right manufacturer for your flange needs.

Why Choose Jihua to Be Your Weld Neck Flange Supplier?

Jihua is a well-established and reputable manufacturer and supplier of weld neck flanges that has been providing high-quality products to customers worldwide for many years. Here are some reasons why you might choose Jihua to be your weld neck flange supplier:

  • High-quality products: Jihua is committed to providing high-quality weld neck flanges made from the best materials and manufactured to the highest standards. The company has strict quality control procedures in place to ensure that each product meets or exceeds customer expectations.
  • Competitive pricing: Jihua offers competitive pricing on its products, which means you can get high-quality weld neck flanges at an affordable price.
  • Wide range of products: Jihua offers a wide range of weld neck flanges, including ANSI, DIN, JIS, EN, and other international standards. This means you can find the right product to meet your specific needs.
  • Excellent customer service: Jihua is committed to providing excellent customer service and support to all of its customers. The company has a team of experienced professionals who are available to answer any questions or concerns you may have.
  • Fast delivery: Jihua understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently.

Jihua is a reliable and trustworthy supplier of weld neck flanges that can meet your needs and exceed your expectations.

Export Country For Welding Neck Flanges

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