Orifice Flanges

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ANSI/ASME B16.36 Orifice Flange Manufacturer, Supplier & Exporter

An Orifice Flange is a specially engineered flange designed for flow measurement applications in piping systems. These flanges are used with an orifice plate to accurately measure the flow rate of liquids, gases, and steam by creating a differential pressure across the plate. Orifice Flanges are widely utilized in industries such as oil & gas, petrochemical, chemical processing, power generation, and water treatment, where precise flow monitoring is essential for operational efficiency and process control. Manufactured according to ANSI/ASME B16.36 standards, these flanges are available in various sizes, pressure classes, and material grades to suit different industrial requirements.

Long Weld Neck Flange (LWN Flange) is an extended version of the Weld Neck Flange, featuring a longer hub. This design makes it ideal for use in situations where additional reinforcement is required, such as pressure vessels, heat exchangers, and pipelines with varying elevations. The extended hub ensures uniform distribution of pressure and provides extra strength in critical applications. Long Weld Neck Flanges are also available in various pressure classes and materials, making them versatile for different industrial environments. Both flanges are highly reliable and preferred for applications demanding durability, strength, and leak-proof connections.

Orifice Flanges are equipped with pressure tap connections that allow easy monitoring of differential pressure for accurate flow calculations. Their robust construction, dimensional accuracy, and leak-proof performance make them suitable for demanding industrial environments. Available in materials such as Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, and other special alloys, these flanges provide excellent strength, corrosion resistance, and long service life under varying operating conditions.

Arrow Piping Solutions is a leading manufacturer, supplier, and exporter of premium quality Orifice Flanges designed to meet international quality and performance standards. We offer a comprehensive range of Orifice Flanges in customized dimensions, materials, and pressure ratings to fulfill the specific requirements of industrial projects. Our products undergo stringent quality inspections to ensure superior performance, reliability, and durability. With advanced manufacturing facilities, competitive pricing, and a commitment to on-time delivery, Arrow Piping Solutions provides dependable flange solutions for customers across domestic and global markets.

Orifice Flange

ANSI B16.36 Orifice 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 B16.36 ORIFICE FLANGE - (CLASS 300 - WELD NECK RAISED FACE) - DIMENSIONS & WEIGHT

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Size in Inch Size in mm Outer Dia. (A) Flange Thick. (B) Hub OD (C) Weld Neck OD (D) Welding Neck Length (E) RF Dia. (F) RF Height (G) PCD (H) Orifice Hole Dia (I) No. of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight (kg)
1 25 125 36.6 54 33.4 81 50.8 2 88.9 6.4 4 5/8 125 3/4 M16 4.5
1 1/2 40 155 36.6 70 48.3 84 73 2 114.3 6.4 4 3/4 135 7/8 M20 6.5
2 50 165 36.6 84 60.3 84 92.1 2 127 6.4 8 5/8 125 3/4 M16 7
2 1/2 65 190 36.6 100 73 87 104.8 2 149.2 6.4 8 3/4 135 7/8 M20 7.5
3 80 210 36.6 117 88.9 87 127 2 168.3 9.5 8 3/4 135 7/8 M20 9.4
4 100 255 36.6 146 114.3 90 157.2 2 200 12.7 8 3/4 135 7/8 M20 13.2
6 150 320 36.6 206 168.3 98 215.9 2 269.9 12.7 12 3/4 135 7/8 M20 14.6
8 200 380 39.7 260 219.1 110 269.9 2 330.2 12.7 12 7/8 145 1 M24 30
10 250 445 46.1 321 273 116 323.8 2 387.3 12.7 16 1 165 1 1/8 M27 41
12 300 520 49.3 375 323.8 129 381 2 450.8 12.7 16 1 1/8 180 1 1/4 M30 62
14 350 585 52.4 425 355.6 141 412.8 2 514.4 12.7 20 1 1/8 185 1 1/4 M30 84
16 400 650 55.6 483 406.4 144 469.9 2 571.5 12.7 20 1 1/4 195 1 3/8 M33 111
18 450 710 58.8 533 457 157 533.4 2 628.6 12.7 24 1 1/4 205 1 3/8 M33 138
20 500 775 62.0 587 508 160 584.2 2 685.8 12.7 24 1 1/4 215 1 3/8 M33 171
24 600 915 68.3 702 610 167 692.2 2 812.8 12.7 24 1 1/2 240 1 5/8 M39 247

ASME B16.36 ORIFICE FLANGE - (CLASS 600 - WELD NECK RAISED FACE) - DIMENSIONS & WEIGHT

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Size in Inch Size in mm Outer Dia. (A) Flange Thick. (B) Hub OD (C) Weld Neck OD (D) Welding Neck Length (E) RF Dia. (F) RF Height (G) PCD (H) Orifice Hole Dia (I) No. of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight (kg)
1 25 125 36.6 54 33.4 81 50.8 2 88.9 6.4 4 5/8 125 3/4 M16 4.5
1 1/2 40 155 36.6 70 48.3 84 73 2 114.3 6.4 4 3/4 135 7/8 M20 6.5
2 50 165 36.6 84 60.3 84 92.1 2 127 6.4 8 5/8 125 3/4 M16 7
2 1/2 65 190 36.6 100 73 87 104.8 2 149.2 6.4 8 3/4 135 7/8 M20 7.5
3 80 210 36.6 117 88.9 87 127 2 168.3 9.5 8 3/4 135 7/8 M20 9.4
4 100 255 36.6 146 114.3 90 157.2 2 200 12.7 8 3/4 135 7/8 M20 13.2
6 150 320 36.6 206 168.3 98 215.9 2 269.9 12.7 12 3/4 135 7/8 M20 14.6
8 200 380 39.7 260 219.1 110 269.9 2 330.2 12.7 12 7/8 145 1 M24 30
10 250 445 46.1 321 273 116 323.8 2 387.3 12.7 16 1 165 1 1/8 M27 41
12 300 520 49.3 375 323.8 129 381 2 450.8 12.7 16 1 1/8 180 1 1/4 M30 62
14 350 585 52.4 425 355.6 141 412.8 2 514.4 12.7 20 1 1/8 185 1 1/4 M30 84
16 400 650 55.6 483 406.4 144 469.9 2 571.5 12.7 20 1 1/4 195 1 3/8 M33 111
18 450 710 58.8 533 457 157 533.4 2 628.6 12.7 24 1 1/4 205 1 3/8 M33 138
20 500 775 62.0 587 508 160 584.2 2 685.8 12.7 24 1 1/4 215 1 3/8 M33 171
24 600 915 68.3 702 610 167 692.2 2 812.8 12.7 24 1 1/2 240 1 5/8 M39 247

ASME B16.36 ORIFICE FLANGE - (CLASS 900 - WELD NECK RAISED FACE) - DIMENSIONS & WEIGHT

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Size in Inch Size in mm Outer Dia. (A) Flange Thick. (B) Hub OD (C) Weld Neck OD (D) Welding Neck Length (E) RF Dia. (F) RF Height (G) PCD (H) Orifice Hole Dia (I) No. of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight (kg)
1 25 125 36.6 54 33.4 81 50.8 2 88.9 6.4 4 5/8 125 3/4 M16 4.5
1 1/2 40 155 36.6 70 48.3 84 73 2 114.3 6.4 4 3/4 135 7/8 M20 6.5
2 50 165 36.6 84 60.3 84 92.1 2 127 6.4 8 5/8 125 3/4 M16 7
2 1/2 65 190 36.6 100 73 87 104.8 2 149.2 6.4 8 3/4 135 7/8 M20 7.5
3 80 210 36.6 117 88.9 87 127 2 168.3 9.5 8 3/4 135 7/8 M20 9.4
4 100 255 36.6 146 114.3 90 157.2 2 200 12.7 8 3/4 135 7/8 M20 13.2
6 150 320 36.6 206 168.3 98 215.9 2 269.9 12.7 12 3/4 135 7/8 M20 14.6
8 200 380 39.7 260 219.1 110 269.9 2 330.2 12.7 12 7/8 145 1 M24 30
10 250 445 46.1 321 273 116 323.8 2 387.3 12.7 16 1 165 1 1/8 M27 41
12 300 520 49.3 375 323.8 129 381 2 450.8 12.7 16 1 1/8 180 1 1/4 M30 62
14 350 585 52.4 425 355.6 141 412.8 2 514.4 12.7 20 1 1/8 185 1 1/4 M30 84
16 400 650 55.6 483 406.4 144 469.9 2 571.5 12.7 20 1 1/4 195 1 3/8 M33 111
18 450 710 58.8 533 457 157 533.4 2 628.6 12.7 24 1 1/4 205 1 3/8 M33 138
20 500 775 62.0 587 508 160 584.2 2 685.8 12.7 24 1 1/4 215 1 3/8 M33 171
24 600 915 68.3 702 610 167 692.2 2 812.8 12.7 24 1 1/2 240 1 5/8 M39 247

ASME B16.36 ORIFICE FLANGE - (CLASS 1500 - WELD NECK RAISED FACE) - DIMENSIONS & WEIGHT

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Size in Inch Size in mm Outer Dia. (A) Flange Thick. (B) Hub OD (C) Weld Neck OD (D) Welding Neck Length (E) RF Dia. (F) RF Height (G) PCD (H) Orifice Hole Dia (I) No. of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight (kg)
1 25 125 36.6 54 33.4 81 50.8 2 88.9 6.4 4 5/8 125 3/4 M16 4.5
1 1/2 40 155 36.6 70 48.3 84 73 2 114.3 6.4 4 3/4 135 7/8 M20 6.5
2 50 165 36.6 84 60.3 84 92.1 2 127 6.4 8 5/8 125 3/4 M16 7
2 1/2 65 190 36.6 100 73 87 104.8 2 149.2 6.4 8 3/4 135 7/8 M20 7.5
3 80 210 36.6 117 88.9 87 127 2 168.3 9.5 8 3/4 135 7/8 M20 9.4
4 100 255 36.6 146 114.3 90 157.2 2 200 12.7 8 3/4 135 7/8 M20 13.2
6 150 320 36.6 206 168.3 98 215.9 2 269.9 12.7 12 3/4 135 7/8 M20 14.6
8 200 380 39.7 260 219.1 110 269.9 2 330.2 12.7 12 7/8 145 1 M24 30
10 250 445 46.1 321 273 116 323.8 2 387.3 12.7 16 1 165 1 1/8 M27 41
12 300 520 49.3 375 323.8 129 381 2 450.8 12.7 16 1 1/8 180 1 1/4 M30 62
14 350 585 52.4 425 355.6 141 412.8 2 514.4 12.7 20 1 1/8 185 1 1/4 M30 84
16 400 650 55.6 483 406.4 144 469.9 2 571.5 12.7 20 1 1/4 195 1 3/8 M33 111
18 450 710 58.8 533 457 157 533.4 2 628.6 12.7 24 1 1/4 205 1 3/8 M33 138
20 500 775 62.0 587 508 160 584.2 2 685.8 12.7 24 1 1/4 215 1 3/8 M33 171
24 600 915 68.3 702 610 167 692.2 2 812.8 12.7 24 1 1/2 240 1 5/8 M39 247

ASME B16.36 ORIFICE FLANGE - (CLASS 2500 - WELD NECK RAISED FACE) - DIMENSIONS & WEIGHT

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Size in Inch Size in mm Outer Dia. (A) Flange Thick. (B) Hub OD (C) Weld Neck OD (D) Welding Neck Length (E) RF Dia. (F) RF Height (G) PCD (H) Orifice Hole Dia (I) No. of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight (kg)
1 25 125 36.6 54 33.4 81 50.8 2 88.9 6.4 4 5/8 125 3/4 M16 4.5
1 1/2 40 155 36.6 70 48.3 84 73 2 114.3 6.4 4 3/4 135 7/8 M20 6.5
2 50 165 36.6 84 60.3 84 92.1 2 127 6.4 8 5/8 125 3/4 M16 7
2 1/2 65 190 36.6 100 73 87 104.8 2 149.2 6.4 8 3/4 135 7/8 M20 7.5
3 80 210 36.6 117 88.9 87 127 2 168.3 9.5 8 3/4 135 7/8 M20 9.4
4 100 255 36.6 146 114.3 90 157.2 2 200 12.7 8 3/4 135 7/8 M20 13.2
6 150 320 36.6 206 168.3 98 215.9 2 269.9 12.7 12 3/4 135 7/8 M20 14.6
8 200 380 39.7 260 219.1 110 269.9 2 330.2 12.7 12 7/8 145 1 M24 30
10 250 445 46.1 321 273 116 323.8 2 387.3 12.7 16 1 165 1 1/8 M27 41
12 300 520 49.3 375 323.8 129 381 2 450.8 12.7 16 1 1/8 180 1 1/4 M30 62
14 350 585 52.4 425 355.6 141 412.8 2 514.4 12.7 20 1 1/8 185 1 1/4 M30 84
16 400 650 55.6 483 406.4 144 469.9 2 571.5 12.7 20 1 1/4 195 1 3/8 M33 111
18 450 710 58.8 533 457 157 533.4 2 628.6 12.7 24 1 1/4 205 1 3/8 M33 138
20 500 775 62.0 587 508 160 584.2 2 685.8 12.7 24 1 1/4 215 1 3/8 M33 171
24 600 915 68.3 702 610 167 692.2 2 812.8 12.7 24 1 1/2 240 1 5/8 M39 247

Orifice Plate Flange Standards

Orifice Flange Standards refer to the industry specifications that govern the design, material, and performance requirements for orifice flanges. Some of the key standards include:

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 Orifice Flanges?

Arrow Piping Solutions is a trusted manufacturer and supplier of premium quality Orifice Flanges, delivering products that combine precision engineering, durability, and reliable performance. Our commitment to quality manufacturing, customer satisfaction, and industry compliance makes us a preferred choice for flow measurement flange solutions across various industries.

Strict Quality Assurance

Every Orifice Flange is manufactured under stringent quality control procedures and thoroughly inspected to ensure compliance with international standards. This guarantees excellent dimensional accuracy, durability, and long-term performance in critical applications.

Technical Expertise

With extensive industry experience and engineering knowledge, our team provides professional guidance to help customers select the most suitable Orifice Flange specifications for their operational requirements and piping systems.

Cost-Effective Solutions

We offer high-quality Orifice Flanges at competitive prices, providing maximum value without compromising on product quality, reliability, or performance.s.

Reliable Customer Support

Our dedicated support team is available to assist customers with product selection, technical queries, order processing, and after-sales service to ensure a smooth and satisfactory experience.

What Is the Function of an Orifice Plate in an Orifice Flange?

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An orifice plate is installed between two Orifice Flanges to create a controlled pressure differential within the pipeline.

This pressure difference is measured and used to determine the flow rate of liquids, gases, or steam, making it an essential component in flow measurement systems.

What Is the Difference Between Orifice Flanges and Standard Flanges?

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Orifice Flanges are specifically designed for flow measurement applications and include pressure tap connections that allow the installation of an orifice plate.

Standard flanges are primarily used for connecting pipes, valves, and equipment and do not provide provisions for flow measurement devices.

Can Orifice Flanges Be Customized?

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Yes Arrow Piping Solutions offers customized Orifice Flanges in various sizes, pressure classes, material grades, and specifications to meet the unique 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