On this page 5 sections
Key features of orifice flanges
- ASME B16.36
- Pressure taps and jack screws
- For flow metering
- Class 300 and above
Orifice Flanges by material
Orifice Flanges are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Orifice Flanges
- SS 304L Orifice Flanges
- SS 304H Orifice Flanges
- SS 309S Orifice Flanges
- SS 310S Orifice Flanges
- SS 316 Orifice Flanges
- SS 316L Orifice Flanges
- SS 316Ti Orifice Flanges
- SS 317 Orifice Flanges
- SS 317L Orifice Flanges
- SS 321 Orifice Flanges
- SS 321H Orifice Flanges
- SS 347 Orifice Flanges
- SS 347H Orifice Flanges
- SS 410 Orifice Flanges
- SS 904L Orifice Flanges
- Duplex 2205 Orifice Flanges
- Super Duplex 2507 Orifice Flanges
- SS 254 SMO Orifice Flanges
Nickel Alloys
- Inconel 600 Orifice Flanges
- Inconel 601 Orifice Flanges
- Inconel 625 Orifice Flanges
- Inconel 718 Orifice Flanges
- Incoloy 800 Orifice Flanges
- Incoloy 800H Orifice Flanges
- Incoloy 800HT Orifice Flanges
- Incoloy 825 Orifice Flanges
- Monel 400 Orifice Flanges
- Hastelloy C22 Orifice Flanges
- Hastelloy C276 Orifice Flanges
- Nickel 200 Orifice Flanges
- Nickel 201 Orifice Flanges
Carbon Steel
Alloy Steel
Orifice Flanges: sizes, finishes and testing
- Size range
- NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
- Finish
- Raised face (RF), flat face (FF) or ring-type joint (RTJ); serrated spiral or concentric face finish (typically 3.2 – 6.3 µm Ra)
- Ends
- Weld-neck bevel matched to pipe schedule; socket bore; threaded
Testing & documents
- Chemical and mechanical tests of the forging
- Dimensional inspection to ASME B16.5 / B16.47
- Hardness, impact and IGC tests as specified
- Ultrasonic testing of forgings on request
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other flanges types
Frequently asked questions
What sizes are orifice flanges available in?
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request.
Which specifications cover orifice flanges?
ASME B16.36.
What are orifice flanges used for?
Pressure taps and jack screws. They're made to ASME B16.36 in weld-neck, slip-on and threaded types.
Which materials are orifice flanges available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.