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Weldolet Pipe Flange Manufacturer, Supplier & Exporter | ASME/ANSI B16.5, B16.47, B16.48, BS4504, BS 10, EN 1092

A Weldolet Flange is a branch connection fitting specifically designed to provide a smooth and reinforced outlet from a larger pipeline to a smaller branch pipe. It is widely used in piping systems where a strong, permanent, and reliable welded connection is required. The design of the Weldolet allows it to be welded directly onto the run pipe, creating an integral branch connection that offers excellent strength and flow characteristics. This makes Weldolet Flanges an ideal choice for high-pressure and high-temperature applications across various industries.

Weldolet Flanges are commonly utilized in oil & gas, petrochemical, power generation, chemical processing, refineries, and water treatment industries. Manufactured from premium-grade materials such as Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, and other specialty alloys, these fittings provide superior corrosion resistance, mechanical strength, and long-term durability. Their streamlined design helps minimize stress concentration while ensuring efficient fluid flow and dependable performance under demanding operating conditions.

Arrow Piping Solutions is a trusted manufacturer, supplier, and exporter of high-quality Weldolet Flanges manufactured according to international standards including ASME/ANSI B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, and EN 1092. Our Weldolet Flanges are available in a wide range of sizes, pressure ratings, and material grades to meet diverse industrial requirements. With advanced manufacturing technology, strict quality assurance procedures, competitive pricing, and prompt delivery, Arrow Piping Solutions provides reliable and cost-effective piping solutions for customers worldwide.

Weldolet Flange

Weld-on flange, Welded pipe flange, Stainless steel, Alloy steel, Carbon steel weldoflange, Forged weldoflange, Flange for welding, Seamless weldoflange, Pipe flange for welding

ANSI B16.5 Weldolet Flange

SIZE RANGE

15mm (1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

STANDARDS / DIMENSION

ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN

PRESSURE CLASS

150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.

FLANGE FACE TYPE

FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.

CARBON STEEL

ASTM A105/A105N (SA105N), LTCS A350 LF2, A694

DUPLEX & SUPER DUPLEX

ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.

STAINLESS STEEL

ASTM A182 F304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.

ALLOY STEEL

ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91

MTC

EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103

Flanges ANSI/ASME B16.5 & B16.47
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Materials

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Stainless Steel ➜ Carbon Steel ➜ Alloy Steel ➜
Weld Neck Flange Diagram

ASME B16.5 WELDOFLANGE (SSH STD) - DIMENSIONS & WEIGHT

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Size Size in mm Height (A) OD-B Hole Dia (C) Weight in KG
1/4 8 14.3 25.4 15.9 0.04
3/8 10 19.05 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.08
3/4 20 22.23 44.45 30.16 0.11
1 25 26.99 53.98 36.51 0.23
1 1/4 32 31.75 65.09 44.45 0.36
1 1/2 40 33.34 73.03 50.8 0.45
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.13
3 80 44.45 122.24 93.66 1.81
3 1/2 90 47.63 142.88 112.71 2.5
4 100 50.8 152.4 120.65 2.86
5 130 57.15 179.3 141.29 4.65
6 150 60.33 215.9 169.86 6.44
8 200 69.85 263.53 220.66 10.66
10 250 77.79 322.26 274.64 17.69
12 300 85.73 377.83 325.44 26.76
14 350 88.9 409.58 357.19 29.94
16 400 93.6 463.55 407.99 34.02
18 450 96.84 520.7 458.79 44
20 500 101.6 571.5 508 53.52
24 600 144.5 717.5 609.6 101
26 650 155.6 778 660.4 120
30 750 174.6 893.6 762 190
36 900 206.4 1070 914.4 310
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750

ASME B16.5 WELDOFLANGE (SCH XS) - DIMENSIONS & WEIGHT

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Size Size in mm Height (A) OD-B Hole Dia (C) Weight in KG
1/4 8 14.3 25.4 15.9 0.04
3/8 10 19.05 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.08
3/4 20 22.23 44.45 30.16 0.11
1 25 26.99 53.98 36.51 0.23
1 1/4 32 31.75 65.09 44.45 0.36
1 1/2 40 33.34 73.03 50.8 0.45
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.13
3 80 44.45 122.24 93.66 1.81
3 1/2 90 47.63 142.88 112.71 2.5
4 100 50.8 152.4 120.65 2.86
5 130 57.15 179.3 141.29 4.65
6 150 60.33 215.9 169.86 6.44
8 200 69.85 263.53 220.66 10.66
10 250 77.79 322.26 274.64 17.69
12 300 85.73 377.83 325.44 26.76
14 350 88.9 409.58 357.19 29.94
16 400 93.6 463.55 407.99 34.02
18 450 96.84 520.7 458.79 44
20 500 101.6 571.5 508 53.52
24 600 144.5 717.5 609.6 101
26 650 155.6 778 660.4 120
30 750 174.6 893.6 762 190
36 900 206.4 1070 914.4 310
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750

ASME B16.5 WELDOFLANGE (SCH XXS) - DIMENSIONS & WEIGHT

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Size Size in mm Height (A) OD-B Hole Dia (C) Weight in KG
1/4 8 14.3 25.4 15.9 0.04
3/8 10 19.05 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.08
3/4 20 22.23 44.45 30.16 0.11
1 25 26.99 53.98 36.51 0.23
1 1/4 32 31.75 65.09 44.45 0.36
1 1/2 40 33.34 73.03 50.8 0.45
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.13
3 80 44.45 122.24 93.66 1.81
3 1/2 90 47.63 142.88 112.71 2.5
4 100 50.8 152.4 120.65 2.86
5 130 57.15 179.3 141.29 4.65
6 150 60.33 215.9 169.86 6.44
8 200 69.85 263.53 220.66 10.66
10 250 77.79 322.26 274.64 17.69
12 300 85.73 377.83 325.44 26.76
14 350 88.9 409.58 357.19 29.94
16 400 93.6 463.55 407.99 34.02
18 450 96.84 520.7 458.79 44
20 500 101.6 571.5 508 53.52
24 600 144.5 717.5 609.6 101
26 650 155.6 778 660.4 120
30 750 174.6 893.6 762 190
36 900 206.4 1070 914.4 310
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750

ASME B16.5 WELDOFLANGE (SCH 160) - DIMENSIONS & WEIGHT

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Size Size in mm Height (A) OD-B Hole Dia (C) Weight in KG
1/4 8 14.3 25.4 15.9 0.04
3/8 10 19.05 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.08
3/4 20 22.23 44.45 30.16 0.11
1 25 26.99 53.98 36.51 0.23
1 1/4 32 31.75 65.09 44.45 0.36
1 1/2 40 33.34 73.03 50.8 0.45
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.13
3 80 44.45 122.24 93.66 1.81
3 1/2 90 47.63 142.88 112.71 2.5
4 100 50.8 152.4 120.65 2.86
5 130 57.15 179.3 141.29 4.65
6 150 60.33 215.9 169.86 6.44
8 200 69.85 263.53 220.66 10.66
10 250 77.79 322.26 274.64 17.69
12 300 85.73 377.83 325.44 26.76
14 350 88.9 409.58 357.19 29.94
16 400 93.6 463.55 407.99 34.02
18 450 96.84 520.7 458.79 44
20 500 101.6 571.5 508 53.52
24 600 144.5 717.5 609.6 101
26 650 155.6 778 660.4 120
30 750 174.6 893.6 762 190
36 900 206.4 1070 914.4 310
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750

Weld-on flange Standards

These standards ensure that weld-on flanges meet the necessary performance, safety, and compatibility requirements for reliable and durable pipe connections in diverse industrial applications.

1. ASME/ANSI Standards (American)

  • ASME B16.5– Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
  • ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
  • ASME B16.36 – Orifice Flanges.
  • ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
  • ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
  • ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.

2. ISO Standards (International)

  • ISO 7005-1 – Steel Flanges for General Applications.
  • ISO 7005-2 – Cast Iron Flanges.
  • ISO 7005-3 – Copper Alloy Flanges.

3. EN Standards (European)

  • EN 1092-1 – Steel Flanges.
  • EN 1092-2 – Cast Iron Flanges.
  • EN 1092-3 – Copper Alloy Flanges.
  • EN 1092-4 – Aluminium Alloy Flanges.

4. DIN Standards (German)

  • DIN 2527 – Blind Flanges.
  • DIN 2576 – Slip-On Flanges (PN 10).
  • DIN 2633 – Weld Neck Flanges (PN 16).
  • DIN 2634 – Weld Neck Flanges (PN 25).
  • DIN 2635 – Weld Neck Flanges (PN 40).

5. JIS Standards (Japanese)

  • JIS B2220 – Steel Pipe Flanges.

6. GOST Standards (Russian)

  • GOST 12820 – Flat Flanges for Steel Pipe Joints.
  • GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
  • GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.

7. BS Standards (British)

  • BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
  • BS 10 – Specification for Flanges and Bolting.

8. API Standards (Oil & Gas)

  • API 6A – Wellhead and Christmas Tree Equipment Flanges.
  • API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).

9. AWWA Standards (Waterworks)

  • AWWA C207 – Steel Ring Flanges for Waterworks Service.

10. MSS Standards (Manufacturer's Standardization Society)

  • MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
  • MSS SP-51 – Flanges for Glass-Lined Equipment.

11. Material-Specific Standards (ASTM)

  • ASTM A105 – Carbon Steel Forged Flanges.
  • ASTM A182 – Alloy and Stainless Steel Forged Flanges.
  • ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
  • ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.

12. Other Regional and Specialized Standards

  • KS B1511 – Korean Standard Flanges.
  • NF E29-206 – French Standard Flanges.
  • SANS 1123 – South African Standard for Steel Flanges.

Why Choose Arrow Piping Solutions For Seamless Weldolet Flanges?

Arrow Piping Solutions is a trusted manufacturer and supplier of premium-quality Seamless Weldolet Flanges designed to deliver exceptional strength, reliability, and performance in demanding piping applications. Our commitment to quality manufacturing, customer satisfaction, and industry compliance makes us a preferred choice for industrial branch connection solutions.

Premium Quality Manufacturing

Our Seamless Weldolet Flanges are manufactured using high-grade raw materials and advanced production techniques to ensure superior mechanical strength, dimensional accuracy, corrosion resistance, and long service life. Every product is thoroughly inspected to meet stringent quality standards.

Customized Engineering Solutions

We offer customized Weldolet Flanges in a wide range of sizes, material grades, pressure classes, and specifications to suit the unique requirements of various industrial projects. Our tailored solutions ensure optimal compatibility and performance within your piping systems.

Extensive Product Range

Arrow Piping Solutions provides Seamless Weldolet Flanges in multiple dimensions and pressure ratings, making them suitable for applications ranging from standard process piping to high-pressure and high-temperature industrial systems.

Technical Expertise and Support

Backed by years of industry experience, our technical team offers professional assistance in selecting the right Weldolet Flanges based on application requirements, operating conditions, and industry standards. We are committed to delivering reliable support throughout every stage of the project.

What Is the Difference Between a Weldolet Flange and a Slip-On Flange?

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A Weldolet Flange is designed to create a branch connection directly on a pipeline through welding, providing excellent strength and reinforcement for high-pressure applications.

A Slip-On Flange, however, slides over the pipe and is welded in position, making it more suitable for moderate-pressure service conditions.

Where Are Weldolet Flanges Commonly Used?

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Weldolet Flanges are widely used in industries such as oil & gas, petrochemical processing, chemical plants, power generation facilities, refineries, water treatment systems, and other industrial sectors where secure branch connections are required.

Can Weldolet Flanges Be Customized?

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Yes,Arrow Piping Solutions offers customized Weldolet Flanges in various material grades, dimensions, pressure ratings, and specifications to meet the exact requirements of different industrial applications and project demands.

AVAILABLE TYPES OF FLANGES

TONGUE AND GROOVE FLANGES

MALE AND FEMALE FLANGES

WELD NECK FLANGES

BLIND FLANGES

Orifice Flange

Socket Weld Flange / SWRF Flange