Copper Nickel Composite Slip On Flange

What is Copper Nickel Composite Slip on Flange?

Cupronickel composite slip on flange is a modified version of the standard slip on flange.

It has an inner flange, also referred to as a collar or stub end and an outer flange.

Unlike standard copper nickel flange made from only CuNi alloy, copper nickel composite slip on flange is made of two different materials. That is:

• Collar or stub end is a copper nickel alloy
• The outer flange is A105N carbon steel

Figure 1 CuNi Composite Slip On Flange

How is Copper Nickel Composite Slip on Flange Made?

The process of manufacturing copper nickel composite slip on flange involves the following key stages:

• Inspect the quality of raw material for both inner flange and outer flange
• Cut copper nickel alloy bar to suitable dimensions
• Forge and form the cut copper nickel bar to form stub end of the composite slip on flange
• Cut A105N carbon steel to suitable dimension, then forge and form to form the outer flange of copper nickel composite slip on flange
• Machine the outer flange by drilling bolt holes
• Subject the inner flange and outer flange to suitable heat treatment
• Inspect and mark the copper nickel composite slip on flange – marks may include dimension standards, pressure rating, material grade, lot number, etc.
• Pack in a seaworthy packaging ready for shipping

Where Can you Use Cupronickel Composite Slip on Flange?

Cupronickel composite slip on flange is suitable for applications that meet the following criteria:

• Non-critical
• Low temperature
• Low pressure

Some of the practical applications include:

• Shipbuilding
• Seawater piping systems
• Power generation
• Offshore oil and gas platform
• Desalination plants, etc.

What is CuNi Composite Slip on Flange used for?

CuNi composite slip on flange provides a reliable way of connecting copper nickel pipes, copper nickel pipe fittings, and other pipe accessories such as valves, pumps, etc.

Moreover, they have low initial installation cost over copper nickel composite weld neck flanges.

How does DIN and EEMUA Composite Slip on Flange Compare?

• Both DIN 86036 and EEMUA 145 specify standards for both inner flange and outer flange
• Size for both the DIN 86036 and EEMUA 145 varies between DN 15 to DN 100 for inner flange
• For inner flange, pressure rating for DIN 86036 is 10 bar and 14 bar while for EEMUA 145 the pressure is 16 bar and 20 bar
• In both DIN 86036 and EEMUA 145, inner flange is a copper nickel alloy
• For both DIN 86036 and EEMUA 145, outer flange is A105 carbon steel with options for galvanization and epoxy coating

How do you Specify Copper Nickel Composite Slip on Flange?

Figure 2 Composite slip on flange

Whenever you are specifying copper nickel composite slip on flange, you should focus on the following:

• Standard specifications where you can choose either DIN 86036 or EEMUA 145
• Size
• The material grade for inner flange and outer flange
• Pressure rating

Where necessary, you should also request for quality testing certificates such as EN 10204 3.1 Certificate.

What is the difference between Loose Flange and Collar in CuNi Composite Slip on Flange?

Loose flange or backing flange is made of A105N carbon steel. It is also called the outer flange.

Moreover, the loose flange has bolt holes and presses the assembly together.

Collar flange or inner flange is made from grades of a copper nickel alloy. It provides a sealing mechanism.

What is the Chemical Composition of Cupronickel Composite Slip on Flange?

The chemical composition of copper nickel composite slip on flange will depend on the standard specifications.

For the outer flange, the material is A105N carbon steel whose chemical composition includes:

Element	Composition in %
Carbon	0.35 max
Copper	0.40 max
Molybdenum	0.12 max
Sulfur	0.040
Manganese	0.6 to 1.05
Silicon	0.10 to 0.35
Phosphorous	0.035
Chromium	0.30 max
Vanadium	0.08 max
Nickel	0.40 max

 

When it comes to the inner flange, which is made from copper nickel alloys, you can choose any of the following:

Figure 3

Figure 4

How do you Install Copper Nickel Composite Slip on Flange in Piping System?

With the backing flange being active, inset the composite slip on flange into a copper nickel pipe.

Once fully fixed, fillet weld both the inside and outside surface of the composite slip on flange.

At the same time, the backing flange will press the entire assembly together for a robust and reliable connection.

How does CuNi Composite Slip on Flange Work?

Since the collar of composite slip on flange acts as a “ring”, you will slip it on the copper nickel pipe.

You will then fillet weld while the outer flanges compress the whole assembly together.

This way, it produces a robust joint/connection in the piping systems for a consistent and reliable flow.

What is the difference between Cupper Nickel Composite Slip on Flange and Composite Weld Neck Flange?

Figure 5

Copper Nickel Pipe Composite Slip on Flange	Copper Nickel Composite Weld Neck Flange
Suitable for low pressure applications	Suitable for high pressure applications
You will fillet weld with copper nickel pipe	Are usually butt welded with copper nickel pipe
Suitable for low-temperature applications	Suitable for both low and high-temperature applications
Less costly compared to CuNi composite weld neck flange	More expensive than CuNi composite slip on flange
Low life expectancy	Higher service life expectancy

 

What is Copper Nickel Composite Slip on Flange Dimension?

The dimensions of copper nickel composite slip on pipes are according to the DIN 86036 or EEMUA 145/EEMUA 234 standards.

How do you Prevent Leakage in CuNi Composite Slip on Flange?

• Choose composite slip on flange whose tolerance meets the stipulated standards
• Adopt accurate and consistent composite slip on flange forging, forming, heat treatment and machining techniques
• Properly fillet weld and assemble composite slip on flange
• CuNi composite slip on flange must pass strict quality standards and testing

When should you use Cupronickel Composite Flange Instead of CuNi Weld Neck Flange?

When dealing with low pressure and low-temperature applications, copper nickel composite slip on flange provides a cost-effective solution.

Besides, Cupronickel composite slip on flange guarantees cost-effective initial installation cost.