Copper Nickel Slip On Flanges
HC Aluminum manufactures and supplies copper nickel slip on flanges for marine, offshore, shipbuilding, seawater cooling and industrial piping systems.
Our standard material options include CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500). We can supply solid copper nickel flanges or composite configurations with copper nickel wetted components and carbon steel backing flanges.
Common requirements include DIN 86033, EEMUA 234 and ASME B16.5, with flange dimensions, pressure class, facing, bore, bolt hole arrangement and inspection requirements matched to the applicable project specification.
- Material
- C70600 · C71500
- Size
- Commonly 1/2 in to 24 in
- Pressure
- Class 150 · Class 300 · PN10 · PN16
- Facing
- FF · RF
What Is a Copper Nickel Slip On Flange?
A copper nickel slip on flange is a flanged pipe connection designed to slide over the outside diameter of a pipe before welding. Copper nickel slip on flanges fit over the pipe end and are secured by welding. They provide a bolted connection for valves, equipment and removable pipe sections in seawater service.
Compared with a weld neck flange, the slip-on design allows the pipe to be positioned through the flange bore before welding. For demanding cyclic service, thermal loads or applications where the piping design requires a butt-welded connection, a weld neck flange may be more appropriate.
For copper nickel piping, material selection is particularly important because the flange may operate directly in seawater or another corrosive medium. HC Aluminum supplies both 90/10 copper nickel and 70/30 copper nickel options depending on the service conditions and engineering specification.
Copper Nickel Materials for Slip On Flanges
CuNi 90/10 — UNS C70600
C70600 is widely used for slip-on flanges in seawater cooling lines, shipboard piping and desalination systems. This 90/10 copper nickel alloy combines good resistance to seawater corrosion with ease of fabrication, making it a practical choice for many marine piping installations.
HC Aluminum supplies C70600 slip-on flanges to match project requirements for pipe size, flange dimensions and material specification. For an overview of other flange configurations in this grade, see our 90/10 copper nickel flange range.
CuNi 70/30 — UNS C71500
C71500 contains approximately 30% nickel and generally offers higher strength and greater resistance to seawater erosion-corrosion than C70600. It may be specified for more demanding marine service, although alloy selection should also account for flow conditions, water quality and the piping design.
Our 70/30 C71500 copper nickel flanges include slip-on options manufactured to the specified dimensions and applicable material requirements. Where a project calls for non-standard dimensions, production can follow customer drawings.
C70600 vs C71500 Copper Nickel Flanges: Which Grade Should You Specify?
| Grade | Typical selection considerations |
| C70600 — 90/10 copper nickel | Commonly specified for seawater cooling, shipboard piping and desalination systems. Often selected for its balance of seawater corrosion resistance, fabrication characteristics and cost. |
| C71500 — 70/30 copper nickel | Considered where the design calls for higher strength or greater resistance to erosion-corrosion under suitable service conditions. It is not automatically required for every seawater installation. |
Temperature, flow conditions, seawater quality and the connected piping material all affect selection. Polluted water, excessive local velocity and poor commissioning practices can reduce service life even when a suitable alloy has been specified.
For connecting pipe dimensions and material options, see our copper nickel pipes and tubes .
Standards for Copper Nickel Slip-On Flanges
DIN 86033 for Shipboard Piping
DIN 86033 is used for copper alloy slip-on flanges in shipbuilding applications. For a repair or replacement, check the existing connection as well as the standard reference: nominal size alone does not establish whether two flanges will fit together.
EEMUA 234 for Offshore 90/10 CuNi Systems
EEMUA 234 addresses 90/10 copper nickel piping for offshore applications, including solid and composite slip-on flange arrangements. It is relevant to seawater services such as cooling and firewater systems where the project specifies this publication.
ASME B16.5 for NPS and Class-Based Connections
ASME B16.5 covers pipe flanges and flanged fittings within NPS 1/2 through NPS 24, with size availability depending on the pressure class. It addresses pressure-temperature ratings, materials, dimensions, tolerances, marking and testing requirements.
Where Copper Nickel Slip On Flanges Are Used
Copper nickel slip on flanges are used to connect seawater piping components where corrosion resistance, practical installation and future maintenance all matter. At Haomei, we supply copper nickel flange solutions for marine and industrial piping projects, with material selection based on the service conditions and connection requirements.
- Shipbuilding and naval piping: Seawater cooling lines, auxiliary piping and equipment connections on vessels. The flange material and joint design are selected according to the vessel's piping specifications.
- Offshore platforms: Seawater utility lines, cooling systems and selected equipment connections where the piping design requires copper nickel materials.
- Desalination plants: Seawater handling lines and selected heat-exchanger connections. The applicable copper nickel grade depends on the medium, operating conditions and project specifications.
- Marine cooling systems: Removable connections around valves, strainers, pumps and other equipment where access for inspection or maintenance is useful.
For seawater piping, flange selection involves more than the alloy name. Pressure rating, temperature, pipe dimensions, vibration, gasket compatibility and the consequences of leakage should all be considered before the connection is specified.
Haomei can review your required flange size, pressure class, copper nickel grade and connection details to help identify a suitable supply option for your project. View 70/30 Copper Nickel Flanges or Request a flange quotation .
Copper Nickel Flange Manufacturing and Supply
HC Aluminum supplies copper nickel pipes, flanges and fittings for seawater, marine and industrial piping systems. Our manufacturing capability covers material preparation, flange forming or forging, machining and final inspection for copper nickel grades such as UNS C70600 and UNS C71500.
For copper nickel slip on flanges and other flange types, production is controlled around the material grade, flange dimensions, connection details and required documentation. Typical work includes:
- Copper nickel material identification and verification
- Cutting and preparation to the required dimensions
- Flange forming or forging according to the specified design
- CNC machining of bore, face, bolt holes and other critical dimensions
- Dimensional and visual inspection before release
- Product marking and traceability
- Material and inspection documentation when specified
- Seaworthy export packing for shipment
Flanges can be supplied to customer drawings, specified standards or project requirements. This allows the same production route to be adapted for different copper nickel piping assemblies rather than relying on a single standard size.
Copper Nickel Slip On Flanges Quality Control
Each copper nickel slip on flange is checked against the specified material grade, dimensions and inspection requirements before shipment.
Material Verification
Material grade, heat information and chemical requirements are checked against the purchase specification.
Dimensional Inspection
Critical dimensions such as flange OD, thickness, bore, bolt circle and hole arrangement are inspected against the approved drawing or applicable standard.
Surface Inspection
Machined and sealing surfaces are checked for visible defects, damage and other conditions that may affect installation.
Mechanical and Project Testing
When required by the order, mechanical testing, PMI, NDT or additional project-specific inspection can be arranged according to the applicable specification.
Why Source Copper Nickel Slip On Flanges from HC Aluminum?
20+ Years of Copper Nickel Experience
HC Aluminum has more than 20 years of experience in copper nickel products, covering pipes, flanges and related piping components. This background helps us handle flange requirements in connection with the pipe material, wall thickness, joining method and service conditions.
C70600 and C71500 Grades
We supply 90/10 copper nickel C70600 and 70/30 copper nickel C71500 slip on flanges for marine, seawater and industrial piping systems. Material selection can be matched to the project specification and operating conditions.
Standard or Project-Specific Dimensions
We can work with ASME, DIN and EEMUA requirements as well as project-specific flange dimensions. Face type, drilling pattern, tolerances and material documentation can be specified before production.
Inspection and Export Supply
Each order can be supplied with the agreed inspection and material documents for project records and traceability. Export packing is arranged for international shipment, with flange surfaces and machined areas protected during handling and transit.
Copper Nickel Slip On Flange Size Chart
DIN 86033 Copper Nickel Slip On Flanges
| specification | A | H | C | X | R | B | F | G | N-Qd0 | Weight |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | kg | |
| 3/8 | 90 | 18 | 12 | 26 | 40 | 16.2 | 2 | 60 | 4-14 | 0.52 |
| 1/2 | 95 | 18 | 12 | 30 | 45 | 20.2 | 2 | 65 | 4-14 | 0.57 |
| 3/4 | 105 | 18 | 12 | 35 | 58 | 25.2 | 2 | 75 | 4-14 | 0.71 |
| 1 | 115 | 18 | 12 | 40 | 68 | 30.2 | 2 | 85 | 4-14 | 0.86 |
| 11/4 | 140 | 20 | 14 | 49 | 78 | 38.25 | 2 | 100 | 4-18 | 1.47 |
| 11/2 | 150 | 20 | 14 | 56 | 88 | 44.75 | 3 | 110 | 4-18 | 1.60 |
| 2 | 165 | 22 | 16 | 69 | 102 | 57.3 | 3 | 125 | 4-18 | 2.20 |
| 21/2 | 185 | 22 | 16 | 88 | 122 | 76.3 | 3 | 145 | 4-18 | 2.66 |
| 3 | 200 | 24 | 18 | 101 | 138 | 89.4 | 3 | 160 | 8-18 | 3.32 |
| 4 | 220 | 28 | 20 | 120 | 158 | 108.4 | 5 | 180 | 8-18 | 4.31 |
| 5 | 250 | 28 | 20 | 146 | 188 | 133.65 | 5 | 210 | 8-18 | 5.37 |
| 6 | 285 | 30 | 22 | 172 | 212 | 159.65 | 5 | 240 | 8-23 | 6.37 |
| 7 | 315 | 32 | 22 | 209 | 242 | 195 | 5 | 270 | 8-23 | 7.22 |
| 8 | 340 | 32 | 24 | 234 | 268 | 220 | 5 | 295 | 8-23 | 9.12 |
| 10 | 395 | 34 | 26 | 284 | 320 | 268.2 | 6 | 350 | 12-23 | 12.10 |
| 12 | 445 | 36 | 26 | 343 | 370 | 325.35 | 6 | 400 | 12-23 | 13.70 |
| 14 | 505 | 38 | 28 | 389 | 430 | 369.35 | 6 | 460 | 16-23 | 19.30 |
| 16 | 565 | 40 | 28 | 442 | 482 | 420.5 | 6 | 515 | 16-27 | 23.20 |
| 18 | 615 | 42 | 28 | 482 | 530 | 458.5 | 6 | 565 | 20-27 | 27.90 |
| 20 | 670 | 47 | 31 | 535 | 585 | 509.5 | 7 | 620 | 20-27 | 35.00 |
| 24 | 780 | 49 | 31 | 640 | 685 | 612 | 8 | 725 | 20-30 | 42.90 |
EEMUA 234 Copper Nickel Slip On Flanges
| specification | D | b | d3 | d6 | h1 | k | N-d2 | Weight |
| inch | mm | mm | mm | mm | mm | mm | kg | |
| 1/2" | 89 | 14 | 16.07 | 23 | 20 | 60.3 | 4-15.9 | 1.15 |
| 3/4" | 98 | 16 | 25.08 | 32 | 24 | 69.8 | 4-15.9 | 1.20 |
| 1" | 108 | 16 | 30.08 | 47 | 24 | 79.4 | 4-15.9 | 1.30 |
| 11/4" | 117 | 17 | 38.1 | 51 | 26 | 88.9 | 4-15.9 | 1.70 |
| 11/2" | 127 | 20 | 44.6 | 61 | 26 | 98.4 | 4-15.9 | 1.80 |
| 2" | 152 | 25 | 57.23 | 73 | 28 | 120.6 | 4-19 | 2.90 |
| 21/2" | 178 | 27 | 76.33 | 91 | 32 | 139.7 | 4-19 | 4.30 |
| 3" | 190 | 27 | 89.18 | 105 | 34 | 152.4 | 4-19 | 4.40 |
| 4" | 229 | 27 | 108.38 | 135 | 40 | 190.5 | 8-19 | 7.30 |
ASME B16.5 CL 150 Copper Nickel Slip On Flanges Stock
| specification | d1 | A | H | C | X | R | B | G | N-Od2 | Weight |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | kg | |
| 1/2" | 21.3 | 88.9 | 15.9 | 11.2 | 30.2 | 34.9 | 22.4 | 60.3 | 4-15.9 | 0.90 |
| 3/4" | 26.7 | 98.4 | 15.9 | 12.7 | 38.1 | 42.9 | 27.7 | 69.8 | 4-15.9 | 1.10 |
| 1" | 33.4 | 107.9 | 17.5 | 14.3 | 49.2 | 50.8 | 34.5 | 79.4 | 4-15.9 | 1.20 |
| 11/4" | 42.2 | 117.5 | 20.6 | 15.9 | 58.7 | 63.5 | 43.2 | 88.9 | 4-15.9 | 1.50 |
| 11/2" | 48.3 | 127 | 22.2 | 17.5 | 65.1 | 73 | 49.5 | 98.4 | 4-15.9 | 1.60 |
| 2" | 60.3 | 152.4 | 25.4 | 19.1 | 77.8 | 92.1 | 61.9 | 120.6 | 4-19 | 2.70 |
| 21/2" | 73 | 177.8 | 28.6 | 22.2 | 90.5 | 104.8 | 74.7 | 139.7 | 4-19 | 4.10 |
| 3" | 88.9 | 190.5 | 30.2 | 23.8 | 107.9 | 127 | 90.7 | 152.4 | 4-19 | 5.10 |
| 4" | 114.3 | 228.6 | 33.3 | 23.8 | 134.9 | 157.2 | 116.1 | 190.5 | 8-19 | 7.00 |
| 5" | 141.3 | 254 | 36.5 | 23.8 | 163.5 | 185.7 | 143.8 | 215.9 | 8-22.2 | 8.00 |
| 6" | 168.3 | 279.4 | 39.7 | 25.4 | 192.1 | 215.9 | 170.7 | 241.3 | 8-22.2 | 9.90 |
| 8" | 219.1 | 342.9 | 44.4 | 28.6 | 246.1 | 269.9 | 221.5 | 298.4 | 8-22.2 | 15.70 |
| 10" | 273 | 406.4 | 49.2 | 30.2 | 304.8 | 323.8 | 276.4 | 361.9 | 12-25.4 | 22.80 |
| 12" | 323.8 | 482.6 | 55.6 | 31.8 | 365.1 | 381 | 327.2 | 431.8 | 12-25.4 | 33.90 |
| 14" | 355.6 | 533.4 | 57.1 | 34.9 | 400 | 412.8 | 359.2 | 476.2 | 12-28.6 | 45.00 |
| 16" | 406.4 | 596.9 | 63.5 | 36.5 | 457.2 | 469.9 | 410.5 | 539.7 | 16-28.6 | 49.00 |
| 18" | 457 | 635 | 68.3 | 39.7 | 504.8 | 533.4 | 461.8 | 577.8 | 16-31.7 | 63.00 |
| 20" | 508 | 698.5 | 73 | 42.9 | 558.8 | 584.2 | 513.1 | 635 | 20-31.7 | 81.50 |
| 24" | 610 | 812.8 | 82.5 | 47.6 | 633.6 | 692.1 | 616 | 749.3 | 20-34.9 | 105.55 |
ASME B16.5 CL 300 Copper Nickel Slip On Flanges Stock
| specification | d1 | A | H | C | X | R | B | G | N-Od2 | Weight |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | kg | |
| 1/2" | 21.3 | 95.2 | 22.2 | 14.3 | 38.1 | 34.9 | 22.4 | 66.7 | 4-15.9 | 0.90 |
| 3/4" | 26.7 | 117.5 | 25.4 | 15.9 | 47.6 | 42.9 | 27.7 | 82.5 | 4-19 | 1.40 |
| 1" | 33.4 | 123.8 | 27 | 17.5 | 54 | 50.8 | 34.5 | 88.9 | 4-19 | 1.70 |
| 11/4" | 42.2 | 133.3 | 27 | 19 | 63.5 | 63.5 | 43.2 | 98.4 | 4-19 | 2.00 |
| 11/2" | 48.3 | 155.6 | 30.2 | 20.6 | 69.8 | 73 | 49.5 | 114.3 | 4-22.2 | 3.00 |
| 2" | 60.3 | 165.1 | 33.3 | 22.2 | 84.1 | 92.1 | 61.9 | 127 | 8-19 | 3.40 |
| 21/2" | 73 | 190.5 | 38.1 | 25.4 | 100 | 104.8 | 74.7 | 149.2 | 8-22.2 | 5.10 |
| 3" | 88.9 | 209.5 | 42.9 | 28.6 | 117.5 | 127 | 90.7 | 168.3 | 8-22.2 | 6.80 |
| 4" | 114.3 | 254 | 47.6 | 31.8 | 146.1 | 157.2 | 116.1 | 200 | 8-22.2 | 11.30 |
| 5" | 141.3 | 279.4 | 50.8 | 34.9 | 177.8 | 185.7 | 143.8 | 234.9 | 8-22.2 | 14.20 |
| 6" | 168.3 | 317.5 | 52.4 | 36.5 | 206.4 | 215.9 | 170.7 | 269.9 | 12-22.2 | 18.30 |
| 8" | 219.1 | 381 | 61.9 | 41.3 | 260.4 | 269.9 | 221.5 | 330.2 | 12-25.4 | 28.20 |
| 10" | 273 | 444.5 | 66.7 | 47.6 | 320.7 | 323.8 | 276.4 | 387.3 | 16-28.6 | 29.50 |
| 12" | 323.8 | 520.7 | 73 | 50.8 | 374.6 | 381 | 327.2 | 450.8 | 16-31.7 | 57.70 |
| 14" | 355.6 | 584.2 | 76.2 | 54 | 425.4 | 412.8 | 359.2 | 514.3 | 20-31.7 | 80.60 |
| 16" | 406.4 | 647.7 | 82.5 | 57.2 | 482.6 | 469.9 | 410.5 | 571.5 | 20-34.9 | 102.10 |
| 18" | 457 | 711.2 | 88.9 | 60.3 | 533.3 | 533.4 | 461.8 | 628.6 | 24-34.9 | 125.20 |
| 20" | 508 | 774.7 | 95.2 | 63.5 | 587.4 | 584.2 | 513.1 | 685.8 | 24-34.9 | 154.70 |
| 24" | 610 | 914.4 | 106.4 | 69.8 | 701.7 | 692.1 | 616 | 812.8 | 24-41.3 | 240.65 |
Slip On vs Weld Neck Flanges
Copper nickel slip on and weld neck flanges use different pipe connection methods, so the suitable type depends on the piping layout, welding procedure, operating conditions and applicable flange standard.
A slip on flange is fitted over the pipe and normally attached with fillet welds. This configuration can be practical for systems where straightforward fabrication and installation are permitted by the project specification. A weld neck flange has a tapered hub and is connected to the pipe by a butt weld, providing a more continuous transition between the pipe and flange.
| Item | Slip On Flange | Weld Neck Flange |
| Pipe Connection | Fits over the pipe and is normally secured by fillet welds. | Uses a tapered hub and butt-weld connection. |
| Fabrication | Can simplify alignment and fabrication for suitable applications. | Requires preparation and execution of the butt-weld joint. |
| Typical Selection | Used where the project design permits a slip-on connection. | Often selected where structural continuity, cyclic loading or project-specific welding requirements are important. |
| Application Decision | Depends on piping design, operating conditions and applicable specification. | Depends on piping design, operating conditions and applicable specification. |
Flange selection should be based on the piping design, operating conditions, welding requirements and applicable specification, rather than on flange price alone. For systems that call for a butt-welded connection, see our Copper Nickel Weld Neck Flanges for more information on this flange configuration.
Solid vs. Composite Copper Nickel Slip On Flanges
Copper nickel slip on flanges can be supplied in either solid alloy or composite construction, depending on the piping layout, pressure requirements and project specification.
Solid Copper Nickel Slip On Flange
A solid copper nickel slip on flange is manufactured from copper nickel alloy through the main flange body. The material is continuous across the component, making this design suitable when the flange material is required to match the associated copper nickel piping system.
Solid construction is commonly specified where material continuity, corrosion resistance and the project material standard are important considerations. The flange can be produced to the required dimensions, bore, pressure class and connection details.
CuNi Composite Slip On Flange
A composite copper nickel slip on flange combines a copper nickel wetted section with a separate backing flange, which may be manufactured from carbon steel or another specified material.
In seawater piping, the copper nickel portion remains in contact with the service medium, while the backing flange provides the mechanical bolting arrangement. This construction can reduce copper nickel usage where the piping design and applicable specifications allow it.
For marine systems where alloy cost, corrosion resistance and flange assembly all need to be considered together, composite construction can be a practical alternative to a fully solid flange.
The appropriate configuration depends on the operating pressure and temperature, piping design, corrosion requirements, bolting arrangement and applicable project standards. Where a composite flange is specified for the project, a copper nickel composite slip on flange can be supplied according to the required design and specification.
FAQ – Copper Nickel Slip On Flanges
Are copper nickel slip on flanges suitable for seawater?
Yes. Copper nickel alloys are widely used in seawater, marine and offshore piping systems. The suitable alloy, flange configuration and design should be confirmed against the piping specification and operating conditions.
Can HC Aluminum supply DIN 86033 slip on flanges?
Yes. HC Aluminum can manufacture DIN 86033 copper nickel slip on flanges according to the specified dimensions, material grade and project requirements.
Are Class 150 and Class 300 the same as 150 psi and 300 psi?
No. ASME pressure classes are not direct psi pressure ratings. The allowable working pressure depends on the material, operating temperature and the applicable standard requirements.
Can HC Aluminum manufacture custom copper nickel slip on flanges?
Yes. HC Aluminum can manufacture copper nickel slip on flanges from customer drawings, flange schedules and project-specific dimensional requirements, subject to production review.
Are Class 150 and PN16 flanges interchangeable?
No. Class 150 and PN16 belong to different flange standard systems. The same nominal size does not necessarily mean that the drilling, dimensions, facing or pressure-temperature ratings will match.
Should I choose a flat face or raised face flange?
The required facing depends on the mating flange, gasket, equipment connection and piping specification. Special attention may be needed when connecting to cast iron, nonmetallic equipment or components with specific flange limitations.
Can a slip on flange connect directly to copper nickel pipe?
Yes, provided that the flange bore, pipe dimensions, alloy combination and welding procedure are suitable for the connection. The actual pipe outside diameter and approved joint details should be confirmed before fabrication.
What information is needed for a copper nickel slip on flange quotation?
Please provide the alloy grade, nominal size, pipe outside diameter, flange standard and edition, pressure designation, facing and required quantity. A drawing is recommended when the bore, drilling or other dimensions differ from the selected standard.
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