Orifice Flange/Plate
What are Orifice Flange/Plate?
An Orifice Flange/Plate is a flow-measuring component used in pipelines to calculate fluid or gas flow rate by introducing a pressure drop. The orifice plate—a flat, thin plate with a precisely machined hole—is mounted between two flanges that feature pressure tapping points for differential pressure measurement.
Asaid Steel Industries is a reliable manufacturer and supplier of Orifice Flange Assemblies, delivering precision-engineered orifice plates and flanges in stainless steel, carbon steel, and exotic alloys.
Key Features
Leak-Proof
Jointing
Durable
Construction
Accurate
Flow Control
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 48” (DN15 – DN1200) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 | |
| PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 | |
| Orifice Flange Types | Flange Configurations | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Orifice Plate Connection | Companion Flange, Flange with Tapped Holes for Orifice Plate Installation | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A105, ASTM A350 LF2 | |
| Alloy / Superalloy | Alloy Steel (A182 F1, F5, F9, F11, F22, F91), Inconel 600/625/825 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Monel 400/K500, Nickel 200/201, Titanium (Grade 2, Grade 5) | |
| Standards & Certifications | ASME / ANSI | ASME B16.5 (Flanges), ASME B16.36 (Orifice Flanges) |
| ASTM | ASTM A182, ASTM A105, ASTM B366 | |
| European Standards | DIN 2633, DIN 2634, EN 1092-1 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Wall Thickness | As per ASME B16.5, customized options |
| Bore Size | Standard or customized bore to match orifice plate requirements | |
| End Connections | Raised Face, Flat Face, Ring Type Joint | |
| Tolerance | As per ASME/ANSI standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide, Hot-Dip Galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Machined, Pickled, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions
| NPS (in) | OD (Outside Diameter) (mm) | Bolt Circle Diameter (mm) | No. of Bolts | Bolt Size | Flange Thickness (mm) | Raised Face Diameter (mm) | Bore Dia. (mm) |
|---|---|---|---|---|---|---|---|
| ½” | 95 | 60 | 4 | ½”-13 UNC | 16 | 57 | 12 – 20 |
| ¾” | 105 | 70 | 4 | ½”-13 UNC | 19 | 66 | 18 – 25 |
| 1” | 115 | 80 | 4 | 5/8”-11 UNC | 22 | 76 | 20 – 30 |
| 1½” | 140 | 100 | 4 | 5/8”-11 UNC | 24 | 102 | 25 – 38 |
| 2” | 150 | 120 | 4 | ¾”-10 UNC | 27 | 127 | 32 – 50 |
| 2½” | 165 | 135 | 4 | ¾”-10 UNC | 30 | 140 | 40 – 65 |
| 3” | 185 | 155 | 4 | 7/8”-9 UNC | 32 | 152 | 50 – 76 |
| 4” | 210 | 185 | 8 | 7/8”-9 UNC | 35 | 178 | 65 – 100 |
| 6” | 280 | 240 | 8 | 1”-8 UNC | 38 | 229 | 100 – 150 |
| 8” | 345 | 305 | 8 | 1¼”-7 UNC | 41 | 292 | 125 – 200 |
| 10” | 405 | 355 | 12 | 1¼”-7 UNC | 46 | 349 | 150 – 250 |
| 12” | 460 | 410 | 12 | 1½”-6 UNC | 51 | 406 | 200 – 300 |
| 14” | 520 | 470 | 12 | 1½”-6 UNC | 57 | 457 | 225 – 350 |
| 16” | 580 | 525 | 16 | 1½”-6 UNC | 62 | 508 | 250 – 400 |
| 18” | 640 | 585 | 16 | 1¾”-5 UNC | 68 | 559 | 300 – 450 |
| 20” | 700 | 640 | 16 | 1¾”-5 UNC | 70 | 610 | 350 – 500 |
| 24” | 815 | 755 | 20 | 2”-4 UNC | 76 | 711 | 400 – 600 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 750 | MPa (Carbon Steel, Stainless Steel, Alloy Steel) |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 120 – 200 | HB (Brinell) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 450 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 200 | HB |
| Surface Finish | Machined / Polished / Pickled / Passivated | – |
| End Connection Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) | – |
| Operating Temperature Range | -46 to 600 | °C (material-dependent) |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 | ASME B16.36 Standards |
Applications of Orifice Flange/Plate
Construction &
Infrastructure
Power Generation &
Energy Sector
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the function of an orifice plate in a pipeline?
Can orifice plates be used for gas and steam?
How are orifice flanges different from standard flanges?
What types of orifice plates are available?
