Copper Nickel Flange Products
Twelve flange types in Copper-Nickel 90/10 and 70/30, manufactured to your ASME/ASTM project specification or drawing. Each page covers construction, standards references, facings and what to include in an enquiry.
Weld Neck FlangeTapered hub, butt-welded to the pipe, for demanding seawater and high-integrity service.
Slip-On FlangeSlides over the pipe and is fillet welded; quick to fit for lower-demand seawater lines.
Blind FlangeSolid closure for pipe ends, nozzles and headers, with a machined sealing face.
Socket Weld FlangePipe seats in a counterbore and is fillet welded; used on small-bore lines.
Threaded FlangeInternally threaded for joints made without welding.
Lap Joint FlangeLoose backing flange used with a stub end; easy bolt-hole alignment.
Composite FlangeCopper nickel wetted component combined with a backing flange, built to your drawing.
Orifice FlangePaired flanges with pressure taps for orifice-plate flow measurement.
Spectacle Blind FlangeFigure-8 isolation device: one solid disc, one open ring, rotated to open or close the line.
RTJ FlangeRing-groove facing for metal ring gaskets in higher-pressure joints.
Expander FlangeCombines a flange with a bore step-up, replacing a separate reducer and flange.
Custom Manufacturing FlangeNon-standard copper nickel flanges made to your drawing.
Choosing between flange types
A quick orientation. Your piping specification and design code make the final decision.
| Flange type | How it joins the pipe | Typical use |
|---|---|---|
| <a href="/products/weld-neck-flange/">Weld neck</a> | Butt weld through a tapered hub | Critical, cyclic or vibrating lines |
| <a href="/products/slip-on-flange/">Slip-on</a> | Two fillet welds | Lower-demand cooling and utility lines |
| <a href="/products/blind-flange/">Blind</a> | Bolts to a mating flange | Closing line ends and nozzles |
| <a href="/products/socket-weld-flange/">Socket weld</a> | Pipe seats in a socket; one fillet weld | Small-bore lines |
| <a href="/products/threaded-flange/">Threaded</a> | Screwed on, no weld | Small-bore lines and no-weld locations |
| <a href="/products/lap-joint-flange/">Lap joint</a> | Loose flange behind a welded stub end | Lines needing frequent dismantling |
| <a href="/products/composite-flange/">Composite</a> | Built to drawing from more than one component | Wetted copper-nickel with a backing component |
| <a href="/products/orifice-flange/">Orifice</a> | Pair with pressure taps | Flow measurement |
| <a href="/products/spectacle-blind-flange/">Spectacle blind</a> | Sits between two flanges | Positive isolation |
| <a href="/products/rtj-flange/">RTJ</a> | Ring groove face, metal ring gasket | Higher-pressure and cyclic joints |
| <a href="/products/expander-flange/">Expander</a> | Weld neck style with bore step-up | Line size increases at flanges |
| <a href="/products/custom-flange/">Custom</a> | Per your drawing | Non-standard requirements |
Sizes, pressure classes and facings are available as per applicable standard and customer specification. See materials for alloy details.
Not sure which flange fits?
Send your line details and specification. We will confirm what can be supplied.