Copper Nickel Flange is an important pipe connection component used in marine seawater piping systems. It is used to connect copper nickel pipes, valves, pumps, equipment, pipe spools and other fittings. Copper nickel flanges provide reliable sealing, easy installation and convenient maintenance for shipbuilding, offshore platforms, desalination plants and seawater pipeline systems.

Copper nickel flange is designed for connecting copper nickel piping systems where corrosion resistance, sealing reliability and easy maintenance are required. In marine seawater service, copper nickel alloys offer excellent resistance to seawater corrosion, erosion corrosion and marine biofouling, making them suitable for long-term use in harsh marine environments.

Copper nickel flanges are commonly used together with copper nickel pipes and fittings in shipbuilding and offshore projects. Depending on the piping design, pressure rating and installation requirement, different flange types can be selected, such as weld neck flanges for high-strength welded connections, slip on flanges for general pipe connections, blind flanges for closing pipeline ends, and lap joint flanges with stub ends for systems requiring easy alignment and disassembly.

Haomei supply copper nickel flanges in 90/10 copper nickel C70600 / CuNi10Fe1Mn and 70/30 copper nickel C71500 / CuNi30Mn1Fe. Available flange types include weld neck flange, slip on flange, blind flange, lap joint flange, loose flange, backing flange, socket weld flange, threaded flange, plate flange and custom copper nickel flanges according to standards or customer drawings. We can supply copper nickel flanges according to international standards, marine standards, project specifications or customer drawings. Custom machining, drilling, facing, thickness, bolt hole arrangement and special dimensions are available upon request.

Types of Copper Nickel Flanges

Copper Nickel Weld Neck Flange

Copper Nickel Weld Neck Flange has a long tapered hub and is butt welded to the pipe. It provides good structural strength and smooth stress transition between pipe and flange. It is suitable for important marine piping systems where high reliability and strength are required.

Features

• Strong welded connection

• Good stress distribution

• Suitable for higher pressure and critical piping systems

• Commonly used in shipbuilding, offshore and seawater systems

• Available in C70600 and C71500 materials
  
  

Typical Applications

• Marine seawater cooling lines

• Offshore platform piping

• Pump inlet and outlet connections

• High-reliability pipe spool systems

• Desalination and seawater service pipelines
  
  

Copper Nickel Slip On Flange

Copper Nickel Slip On Flange is slipped over the pipe and welded both internally and externally. It is one of the most commonly used flange types in copper nickel piping systems due to simple installation and economical cost.

Features

• Easy installation

• Economical flange connection

• Suitable for general marine seawater piping

• Good compatibility with copper nickel pipes

• Available in standard or custom dimensions
  
  

Typical Applications

• Shipbuilding piping systems

• Seawater cooling systems

• Fire water systems

• Ballast water lines

• Deck wash systems
  
  

Copper Nickel Blind Flange

Copper Nickel Blind Flange is a solid flange without a center bore. It is used to close the end of pipelines, valves, nozzles or equipment openings. It is also used for inspection, maintenance and pressure testing.

Features

• Used for closing pipe ends

• Easy to remove for maintenance

• Suitable for pressure testing and isolation

• Available with RF, FF or customized facing

• Standard and custom bolt hole arrangements available
  
  

Typical Applications

• Pipeline end closure

• Valve isolation

• Pump and equipment nozzle closure

• Pressure testing

• Temporary or permanent sealing
  
  

Copper Nickel Lap Joint Flange

Copper Nickel Lap Joint Flange is used together with a copper nickel stub end. The flange itself can rotate around the pipe before tightening, making bolt hole alignment easier during installation.

Features

• Used with copper nickel stub end

• Easy bolt hole alignment

• Suitable for systems requiring frequent dismantling

• Good for prefabricated pipe spool assemblies

• Common in marine copper nickel piping systems
  
  

Typical Applications

• Shipyard pipe spool fabrication

• Pump and valve connections

• Piping systems requiring frequent maintenance

• Large-diameter marine pipe connections

• Seawater pipeline assembly
  
  

Copper Nickel Loose Flange / Backing Flange

Copper Nickel Loose Flange or Copper Nickel Backing Flange is commonly used with a stub end, collar or flared pipe end. It provides a bolted connection while allowing easier alignment during installation.

Features

• Convenient installation

• Easy alignment

• Can be used with stub ends or collars

• Suitable for marine pipe spool systems

• Cost-effective for some piping designs
  
  

Typical Applications

• Marine seawater piping

• Copper nickel pipe spool assemblies

• Flanged connections with stub ends

• Maintenance-friendly piping systems
  
  

Copper Nickel Socket Weld Flange

Copper Nickel Socket Weld Flange has a socket into which the pipe is inserted and then welded. It is usually used for smaller pipe sizes where compact and strong connections are needed.

Features

• Compact design

• Suitable for small bore piping

• Strong welded connection

• Good alignment during installation

• Available according to drawings or standards
  
  

Typical Applications

• Small diameter seawater piping

• Instrument connections

• Auxiliary marine piping systems

• Offshore small-bore pipework
  
  

Copper Nickel Threaded Flange

Copper Nickel Threaded Flange is connected to the pipe by thread and does not require welding. It is generally used for low-pressure or special applications where welding is not preferred.

Features

• No welding required

• Easy installation and disassembly

• Suitable for special low-pressure applications

• Thread type can be customized

• Not recommended for severe vibration or high-pressure service unless approved by project design
  
  

Typical Applications

• Low-pressure auxiliary systems

• Temporary connections

• Maintenance lines

• Special non-welded pipe connections

Copper Nickel Flange Material Grades

90/10 vs 70/30 Copper Nickel Flange

90/10 copper nickel flanges are widely used in general marine seawater piping systems because of their excellent corrosion resistance and cost effectiveness.
70/30 copper nickel flanges provide higher strength and better performance in more severe seawater conditions, offshore projects or high-velocity seawater systems.

Standards for Copper Nickel Flanges

Copper nickel flanges can be supplied according to international standards, marine standards, project specifications or customer drawings.

Common standards include:

• ASME B16.5

• ASME B16.47

• EN 1092-3

• DIN marine flange standards

• JIS flange standards

• EEMUA copper nickel piping specifications

• ASTM copper nickel material specifications

• Shipyard standards

• Customer drawings and project specifications

Copper Nickel Flange Specification

Common Facing Types for Copper Nickel Flanges

For marine copper nickel piping systems, FF and RF faces are commonly used. The final facing type should be selected based on pressure rating, gasket type, mating flange and project design.

Common Pressure Ratings

Copper nickel flanges can be supplied in different pressure ratings according to standards and project requirements.

Common pressure ratings include:

• PN6

• PN10

• PN16

• PN25 if required

• Class 150

• Class 300

• Customized pressure rating according to drawing

For shipbuilding and marine projects, pressure rating selection should be based on system design pressure, temperature, medium, flange standard and gasket arrangement.

Manufacturing of Copper Nickel Flanges

Copper nickel flanges can be produced by forging, machining, cutting, fabrication or custom manufacturing, depending on flange type, size and project requirements.

Typical manufacturing processes include:

1. Material selection and verification

2. Cutting or forging preparation

3. Rough machining

4. Heat treatment if required by specification

5. Precision machining of bore, OD and thickness

6. Facing surface machining

7. Bolt hole drilling

8. Groove or special machining if required

9. Deburring and surface cleaning

10. Dimensional inspection

11. Marking and packing

Matching Copper Nickel Pipe and Fittings

We can supply complete copper nickel piping products together with copper nickel flanges, including:

• Copper nickel pipe

• Copper nickel tube

• Copper nickel elbow

• Copper nickel tee

• Copper nickel reducer

• Copper nickel cap

• Copper nickel saddle

• Copper nickel stub end

• Copper nickel coupling

• Copper nickel union

• Copper nickel pipe spool

• Custom copper nickel fittings

Quality Control and Inspection

To ensure reliable performance in marine and seawater environments, copper nickel flanges can be inspected according to project specifications and applicable standards.

Available inspection items include:

• Chemical composition analysis

• Mechanical property test if required

• Visual inspection

• Dimensional inspection

• Outside diameter inspection

• Bore diameter inspection

• Flange thickness inspection

• Hub dimension inspection

• Bolt hole quantity and diameter inspection

• Bolt circle / PCD inspection

• Facing surface inspection

• Flatness inspection

• Surface quality inspection

• PMI material verification

• Dye penetrant test if required

• Ultrasonic test if required

• Hardness test if required

• Third-party inspection

• Classification society inspection upon request

• Material test certificate
  
  

Packaging of Copper Nickel Flanges

Copper nickel flanges are packed carefully to avoid collision, deformation, scratching and contamination during transportation. Standard export packing includes plastic wrapping, protective film, carton boxes, wooden cases, wooden pallets and seaworthy packing.

For project orders, each package can be marked according to:

• Material grade

• Flange type

• Size

• Pressure rating

• Standard

• Heat number

• Quantity

• Drawing number if applicable

• Customer marking requirements
  
  

Why Choose Us for Copper Nickel Flanges?

• Supply 90/10 and 70/30 copper nickel flanges

• Available materials: C70600, C71500, CuNi10Fe1Mn, CuNi30Mn1Fe

• Multiple flange types available: weld neck, slip on, blind, lap joint, loose, backing, socket weld, threaded and custom flanges

• Standard sizes and custom drawings are supported

• Suitable for shipbuilding, offshore, desalination and seawater systems

• Matching copper nickel pipes and fittings can be supplied

• Custom drilling, facing and machining available

• Strict dimensional inspection and material control

• Third-party inspection can be arranged upon request

• Export seaworthy packing for safe delivery

• Technical support for copper nickel piping projects