Bronze Blind Flanges Manufacturer & Exporter
Blind flanges are solid discs used to close the end of a pipe, valve or pressure vessel nozzle. In bronze and copper alloys they are used for isolation, maintenance access and pressure testing.
What is a Blind flange?
A blind flange has no bore. Bolted to a mating flange, it closes the line, so it is the standard means of terminating a pipe run, blanking a nozzle or leaving a branch available for future extension. It also carries the full pressure load across its face, which is why flange thickness is a design-critical dimension.
In copper alloys, blind flanges are common on seawater, cooling-water and utility systems, where a bronze blank avoids galvanic problems with a bronze mating flange. They are also used for hydrostatic testing, with a tapped hole where a test or vent connection is needed.
Construction
- Solid disc without a through bore
- Thickness set by pressure class and material per the standard or design
- Flat face or raised face, per standard
- Bolt holes drilled to specified pattern
- Optional tapped connection for test, vent or drain
Values vary according to applicable specification, material condition and customer requirements.
Bronze Blind Flanges — specification
| Type | Blind (solid) flange |
|---|---|
| Face | Flat face / raised face / custom |
| Thickness | Per applicable standard or customer design |
| Optional features | Tapped test or vent port; special markings |
| Sizes | As per customer requirement / applicable standard |
| Pressure classes | Pressure classes and pressure-temperature ratings are defined by the standard applied and depend on alloy and temperature. Available as per applicable material and dimensional standard. |
| Facing options | Flat face (FF), raised face (RF) or custom facing as specified by the standard or drawing. |
| Standards | Typical reference standards for copper-alloy flanges include ASME B16.24 (cast copper alloy pipe flanges and flanged fittings), MSS SP-106 (cast copper alloy flanges and flanged fittings) and EN 1092-3 (copper alloy flanges). Customer drawings and other national or project standards are also worked to. The standard to be applied is confirmed when the enquiry is reviewed. |
|---|---|
| Dimensions | Outside diameter, thickness, bore, bolt-circle diameter, number and size of holes per the standard or customer drawing. Available as per applicable material and dimensional standard. |
Available bronze materials
Available as per applicable material and dimensional standard. Select a grade for composition limits, mechanical properties and corrosion notes.
| UNS grade | Alloy family | Note |
|---|---|---|
| UNS C95800 | Nickel aluminium bronze, NAB (Cu-Al-Ni-Fe-Mn) | UNS C95800 is the standard cast nickel aluminium bronze for seawater service. |
| UNS C95500 | Nickel-bearing aluminium bronze (Cu-Al-Ni-Fe-Mn) | UNS C95500 is a high-strength nickel-bearing aluminium bronze for heavily loaded components in marine and industrial service. |
| UNS C95400 | Aluminium bronze (Cu-Al-Fe) | UNS C95400 is a heat-treatable aluminium bronze that combines high strength with good wear and corrosion performance, making it a common choice for demanding pump, valve and marine components. |
| UNS C83600 | Leaded red brass / composition bronze (Cu-Sn-Pb-Zn) | UNS C83600 — commonly called gunmetal, composition bronze or red bronze — is the traditional general-purpose cast alloy for valves, pump parts and pipe fittings, and the material behind our gunmetal flanges. |
| UNS C63000 | Wrought nickel aluminium bronze (Cu-Al-Ni-Fe-Mn-Si) | UNS C63000 is a wrought (not cast) aluminium bronze. |
Where these flanges are used
- Pipeline isolation and end closure
- Hydrostatic pressure testing of pipework
- Valve and pump nozzle blanking
- Future-expansion branch connections
Inspection and testing
- Thickness against standard or drawing
- Face flatness and finish
- Hole pattern (PCD) and bolt-hole size
- Visual check for surface porosity on the sealing face
- Material identification and documents as agreed (MTC, inspection report, as applicable)
Made to your specification
Tapped ports, special thicknesses, lifting-lug holes and non-standard drilling are available on request. State the pressure class or design pressure in your enquiry.
For non-standard dimensions, see custom & special flanges.
Related flange types
- Slip-On FlangesSlip-on flanges are machined from bronze and copper-alloy grades so that the pipe slides into the bore and is secured by fillet welding or brazing, depending on material and procedure..
- Plate FlangesPlate flanges are flat rings with a bore and a bolt-hole pattern.
- Custom / Special FlangesSend your drawing, sample or specification.
Have a Bronze Flange Requirement?
Send us your drawing, specification, material grade, size and quantity.