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47 grades 5 material families

Flanges

Flanges join pipes, valves, pumps and equipment with a bolted, gasketed joint that can be taken apart. Dimensions and pressure-temperature ratings follow ASME B16.5 (NPS ½"–24") and B16.47 Series A/B (NPS 26"–60"), in classes 150 to 2500.

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Flanges NPS ½" – 24" (B16.5), 26"
On this page 6 sections
  1. Types
  2. By material
  3. Manufacturing
  4. Sizes & testing
  5. Marking & packing
  6. FAQs

Types of flanges

Weld Neck FlangesWeld-neck (WN) flanges have a long tapered hub that is butt-welded to the pipe.Slip-On FlangesSlip-on (SO) flanges slide over the pipe and are fillet-welded inside and out.Blind FlangesBlind flanges are solid discs that close off a pipe end, nozzle or valve opening.Socket Weld FlangesSocket-weld (SW) flanges have a counterbore that takes the pipe end, which is then fillet-welded.Threaded FlangesThreaded (screwed) flanges have internal NPT threads and join threaded pipe without welding.Lap Joint FlangesLap-joint (LJ) flanges are loose backing flanges used with stub ends.Spectacle BlindsSpectacle blinds (figure-8 blinds) combine a blank and a spacer joined by a web, fitted between two flanges to positively isolate a line.Orifice FlangesOrifice flanges hold an orifice plate for flow measurement, and have tapped pressure-tap holes and jack screws.

Flanges by material

Stainless Steel Flanges

Nickel Alloys Flanges

Carbon Steel Flanges

Alloy Steel Flanges

Non-Ferrous Metals Flanges

How they are made

Flanges are forged from billets (or cut from plate for some blind and plate flanges), heat treated to the material specification, and machined: bore, face, raised face or ring groove, bolt holes and hub bevel.

Flanges: how they are made, sized and tested

Flanges NPS ½" – 24" (B16.5), 26"

How it's madeFlanges are forged from billets (or cut from plate for some blind and plate flanges), heat treated to the material specification, and machined: bore, face, raised face or ring groove, bolt holes and hub bevel.

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

  1. Chemical and mechanical tests of the forging
  2. Dimensional inspection to ASME B16.5 / B16.47
  3. Hardness, impact and IGC tests as specified
  4. Ultrasonic testing of forgings on request
  5. EN 10204 3.1 certificate; 3.2 with third-party inspection

Marking and packing

Marking: Manufacturer, specification and grade (e.g. A182 F316L), NPS, class, facing, bore schedule and heat number, stamped on the rim.

Packing: Wooden boxes or pallets, with face protection (plastic or wooden discs) and anti-rust treatment for carbon steel.

Frequently asked questions

What does flange class 150 or 300 mean?

It's the pressure-temperature rating class under ASME B16.5. The allowable working pressure depends on the material group and temperature, not simply "150 psi".

RF or RTJ?

Raised-face flanges with spiral-wound or sheet gaskets are standard. Ring-type joint (RTJ) flanges with metal ring gaskets are used for high pressure and temperature.

Which materials are flanges available in?

Stainless Steel, Nickel Alloys, Carbon Steel, Alloy Steel, Non-Ferrous Metals: 47 grades in total, from stock or mill-sourced.

What sizes of flanges do you supply?

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.

How are flanges tested?

Chemical and mechanical tests of the forging; Dimensional inspection to ASME B16.5 / B16.47; Hardness, impact and IGC tests as specified.

Need flanges?

Send grade, specification, size and quantity. We reply with availability and documentation.

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