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Copper Nickel Pipe Cap

Copper Nickel Pipe Caps are butt weld fittings used to permanently close the end of a piping system. They are widely used in marine, shipbuilding, offshore, seawater cooling, desalination and industrial piping applications where superior corrosion resistance is required.

We supply Copper Nickel Pipe Cap in DIN 28011, EEMUA 146 and ASME B16.9 standards, with materials including CuNi 90/10, CuNi 70/30, CuNi10Fe1.6Mn, UNS C70600 and UNS C71500.

Copper nickel end caps provide superior resistance to seawater corrosion, marine biofouling, and erosion compared with conventional steel end caps. These properties make them a preferred choice for long-term operation in marine, offshore, and seawater piping systems.

  • CuNi 90/10 C70600
  • CuNi 70/30 C71500
  • DIN 28011
  • EEMUA 146
  • ASME B16.9
  • DN15-DN500

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Copper Nickel End Cap C70600 C71500 for marine piping and seawater systems

Copper Nickel End Cap Specification

Product Copper Nickel Pipe Cap / Copper Nickel End Cap / Butt Weld Cap
Standards DIN 28011, EEMUA 146, ASME B16.9
Size Range DN15-DN500
Material CuNi 90/10, CuNi 70/30, CuNi10Fe1.6Mn
UNS Grade C70600, C71500, EEMUA 145 UNS C7060X
Pressure Rating 10 bar, 14 bar, 16 bar, 20 bar
Wall Thickness Sch5S, Sch10S, Sch40S, Sch80S
Connection Type Butt Weld
Manufacturing Type Seamless or Welded
Application Seawater piping, marine systems, offshore platforms, desalination plants

Types of Copper Nickel End Cap

Copper Nickel Pipe Caps can be supplied according to DIN, EEMUA and ASME dimensional requirements to match project drawings and pipeline specifications.

Copper Nickel End Caps - DIN 28011

DIN 28011 copper nickel caps are widely used in European marine and industrial piping systems. They are designed for reliable pipe-end closure where corrosion resistance and dimensional accuracy are required.

  • Standard: DIN 28011
  • Size: DN15-DN500
  • Thickness and Pressure Rating: 10 bar, 14 bar
  • Material: Copper Nickel CuNi10Fe1.6Mn, EEMUA 145 UNS C7060X
  • Common Grades: CuNi 90/10 C70600, CuNi 70/30 C71500

Copper Nickel End Caps - EEMUA 146

EEMUA 146 copper nickel end caps are commonly selected for seawater service, naval vessels, offshore piping and shipboard cooling systems. EEMUA copper nickel fittings are valued for their stable performance in saline environments.

  • Standard: EEMUA 146
  • Size: DN15-DN500
  • Thickness and Pressure Rating: 16 bar, 20 bar
  • Material: Copper Nickel CuNi10Fe1.6Mn, EEMUA 145 UNS C7060X
  • Common Grades: CuNi 90/10 C70600, CuNi 70/30 C71500

Copper Nickel End Caps - ASME B16.9

ASME B16.9 copper nickel caps are suitable for international projects requiring American standard butt weld fittings. They are available in different schedules to match pipe wall thickness and system design pressure.

  • Standard: ASME B16.9
  • Size: DN15-DN500
  • Thickness and Pressure Rating: Sch5S, Sch10S, Sch40S, Sch80S
  • Material: Copper Nickel CuNi10Fe1.6Mn, EEMUA 145 UNS C7060X
  • Common Grades: CuNi 90/10 C70600, CuNi 70/30 C71500
  • Connection: Butt Weld

Copper Nickel Pipe Cap Materials: CuNi 90/10 (C70600) & CuNi 70/30 (C71500)

Copper nickel pipe caps are manufactured primarily from CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500). Both alloys are widely specified for marine, offshore and seawater piping systems due to their excellent resistance to seawater corrosion, biofouling and long-term service degradation.

CuNi 90/10 Pipe Cap (UNS C70600)

CuNi 90/10 is the most commonly used copper nickel alloy for commercial marine piping applications. With approximately 90% copper and 10% nickel, this material provides reliable corrosion resistance, good fabrication characteristics and a long service life in seawater environments.

Key Advantages

  • Excellent resistance to seawater and saltwater corrosion
  • Good welding and fabrication performance
  • Low maintenance requirements in marine service
  • Economical solution for shipbuilding and desalination projects

CuNi 70/30 Pipe Cap (UNS C71500)

CuNi 70/30 contains a higher nickel content than CuNi 90/10, providing increased mechanical strength and improved resistance to erosion-corrosion. It is frequently selected for high-velocity seawater systems, offshore platforms and naval engineering applications.

Key Advantages

  • Superior erosion-corrosion resistance in fast-flowing seawater
  • Higher strength and durability under demanding conditions
  • Suitable for offshore, naval and industrial marine systems
  • Excellent reliability in aggressive seawater environments

Copper Nickel Pipe End Cap Chemical Composition

90/10 (UNS C70600) CuNi Pipe End Cap Chemical Composition

KME CuNi90/10 DIN 17664 2.0882 BS 2871 CN102 ASTM B466 C70600 JIS H3300 C7060T DIN 86019 2.1972 EEMUA 234 UNS 7060X GB/T 5231 BFe10-1.6-1
Ni% 10.0-11.0 9.0-11.0 10.0-11.0 9.0-11.0 9.0-11.0 9.0-11.0 10.0-11.0 9.0-11.0
Fe% 1.5-1.8 1.0-2.0 1.0-2.0 1.0-1.8 1.0-1.8 1.5-1.8 1.5-2.0 1.5-1.8
Mn% 0.6-1.0 0.5-1.0 0.5-1.0 max.1.0 0.2-1.0 0.5-1.0 0.5-1.0 0.5-1.0
C% max.0.05 max.0.05 max.0.05 max.0.05 max.0.05 max.0.05 max.0.05
Pb% max.0.01 max.0.03 max.0.01 max.0.02 max.0.05 max.0.01 max.0.01 max.0.03
S% max.0.005 max.0.02 max.0.05 max.0.02 max.0.005 max.0.02 max.0.01
P% max.0.02 max.0.02 max.0.02 max.0.02 max.0.02 max.0.02
Zn% max.0.05 max.0.50 max.0.50 max.0.50 max.0.05 max.0.20 max.0.20
Other max.0.20 max.0.30 max.0.20 max.0.30 max.0.40
Cu% rem. rem. rem. rem. +Ni+Fe+Mn min99.5 rem. rem. rem.

70/30 (UNS C71500) CuNi Pipe End Cap Chemical Composition

KME CuNi70/30 DIN 176642.0882 BS 2871 CN107 ASTM B466C71500 JIS H3300C7150T
Ni% 30.0-32.0 30.0-32.0 30.0-32.0 29.0-33.0 29.0-33.0
Fe% 0.47-0.7 0.4-1.0 0.4-1.0 0.4-1.0 0.4-1.0
Mn% 0.5-1.0 0.5-1.5 0.5-1.5 max.1.0 0.2-1.0
C% max.0.04 max.0.05 max.0.06 max.0.05
Pb% max.0.01 max.0.03 max.0.01 max.0.02 max.0.05
S% max.0.01 max.0.02 max.0.08 max.0.02
P% max.0.02 max.0.02 max.0.02
Zn% max.0.20 max.0.50 max.0.50 max.0.50
Other max.0.30 max.0.30
Cu% rem. rem. rem. rem. +Ni+Fe+Mn min99.5

What Is a Copper Nickel Pipe Cap?

A Copper Nickel Pipe Cap is a butt weld pipe fitting designed to seal the end of a copper nickel piping system. Installed by welding directly to the pipe, it provides a secure and leak-tight closure capable of withstanding system pressure and demanding operating conditions.

Why Choose Copper Nickel Pipe Cap?

Copper Nickel Pipe Caps are widely used in seawater, offshore and shipbuilding applications where long-term reliability and corrosion protection are critical. Compared with conventional carbon steel fittings, copper nickel caps provide superior resistance to aggressive marine environments and help reduce maintenance requirements throughout the service life of the piping system.

Manufactured from copper nickel alloys such as CuNi 90/10 and CuNi 70/30, these pipe caps develop a naturally protective oxide layer when exposed to seawater. This protective film helps minimize corrosion, erosion and biological growth, making copper nickel end caps a preferred choice for cooling water lines, ballast systems, firefighting pipelines and offshore process piping.

  • Outstanding resistance to seawater corrosion and chloride attack
  • Reduced marine growth and biofouling in coastal environments
  • Excellent durability in shipbuilding and offshore installations
  • Good weldability for efficient fabrication and installation
  • Low maintenance requirements and extended service life
  • Suitable for cooling water, ballast water and fire protection systems
  • Reliable performance under both low-pressure and high-pressure operating conditions
  • Available in CuNi 90/10 and CuNi 70/30 grades to meet project specifications

Applications of Copper Nickel Pipe Caps

  • Marine piping systems
  • Shipbuilding projects
  • Offshore oil and gas platforms
  • Desalination plants
  • Power station cooling systems
  • Seawater pipelines
  • Ballast water treatment systems
  • Fire protection systems
  • Condensers and heat exchangers

Copper Nickel Pipe Cap Quality & Inspection

To ensure reliable performance in marine, offshore and seawater piping systems, every Copper Nickel Pipe Cap is manufactured and inspected in accordance with applicable industry standards and customer specifications. Complete material traceability and inspection documentation can be provided upon request.

Inspection & Testing Capabilities

  • Raw material chemical composition verification
  • Mechanical property testing
  • Dimensional and tolerance inspection
  • Visual surface examination
  • Wall thickness measurement
  • Positive Material Identification (PMI)
  • Hydrostatic pressure testing when specified
  • Material traceability throughout production
  • EN 10204 3.1 Material Test Certificate (MTC) available

Manufacturing & Supply Options

Copper Nickel Pipe Caps are available in standard and custom configurations to meet project-specific requirements. Products can be manufactured according to international standards, engineering drawings or client technical specifications for marine and industrial applications.

  • Custom or standard wall thickness available
  • Seamless and welded construction options
  • DIN 28011, EEMUA 234 and ASME B16.9 standards
  • CuNi 90/10 and CuNi 70/30 material grades
  • Project-specific dimensions and tolerances
  • Export-grade seaworthy packaging for global shipment

Why Choose Our Copper Nickel Pipe Caps?

  • Specialized manufacturer of copper nickel pipe fittings with over two decades of production experience.
  • Comprehensive product range covering DIN 28011, EEMUA 234, ASME B16.9 and other international standards.
  • Available in CuNi 90/10 (C70600) and CuNi 70/30 (C71500) alloys for demanding marine and seawater applications.
  • Produced with strict dimensional tolerances to ensure reliable fit-up and welding performance.
  • Full material traceability and inspection documentation available upon request.
  • Factory-direct supply with competitive pricing and consistent product quality.
  • Efficient production scheduling and dependable delivery for urgent project requirements.
  • Extensive export experience supporting shipbuilding, offshore platforms, desalination plants and seawater piping systems worldwide.
  • Technical assistance available for material selection, specification compliance and marine piping projects.

Copper Nickel Pipe Cap: 90/10 vs 70/30 Material Comparison

Item 90/10 Copper Nickel (C70600) 70/30 Copper Nickel (C71500)
Typical Composition ~90% Cu, 10% Ni, Fe & Mn additions ~70% Cu, 30% Ni, Fe & Mn additions
Corrosion Resistance Excellent in seawater and marine environments Superior resistance in aggressive and high-velocity seawater
Mechanical Strength Good ductility and reliable strength Higher strength and improved erosion resistance
Typical Applications Shipbuilding, seawater cooling systems, desalination plants, fire protection systems Naval vessels, offshore platforms, high-pressure and high-flow seawater systems
Cost Level More economical for general marine use Higher cost due to increased nickel content
Recommended Use Standard marine and industrial seawater systems Critical service conditions with high velocity or extreme environments

Both CuNi 90/10 and CuNi 70/30 copper nickel pipe caps provide excellent long-term resistance against seawater corrosion. The final selection should be based on flow conditions, system pressure, and project service requirements.

Copper Nickel End Cap Dimensions and Stock

Copper Nickel End Cap Dimensions Drawing Showing OD S H1 and H2

Dimension Definitions

  • ØOD Outside diameter of the copper nickel end cap.
  • S Nominal wall thickness matching the connected pipe.
  • h1 Straight flange length used for butt-welding and installation.
  • h2 Crown height measured from the tangent line to the apex of the cap.

Note: Actual dimensions may vary depending on DIN 28011, EEMUA 234, ASTM, EN, or customer-specific requirements. Custom dimensions are available upon request.

Copper Nickel End Cap DIN28011 Dimensions

specification OD S h1 h2 Weight
inch DN mm mm mm mm kg
1 25 30 1.5 14 5 0.07
11/4 32 38 1.5 14 6.5 0.10
11/2 40 44.5 1.5 14 8 0.12
2 50 57 1.5 18 10 0.18
21/2 65 76 2 18 16 0.31
3 80 89 2 20 16 0.39
4 100 108 2.5 20 20 0.75
5 125 133 2.5 20 24 0.95
6 150 159 2.5 20 29 1.35
7 175 194 3 20 36 1.95
8 200 219 3 20 41 2.60
10 250 267 3 20 50 3.85
12 300 324 4 20 61 6.60
14 350 368 4 20 69 8.80
16 400 419 4 20 79 12.20
18 450 457 4.5 20 87 12.55
20 500 508 5 20 96 18.80
24 600 610 5 20 115 26.70

Copper Nickel End Cap EEMUA 234 Dimensions

specification OD S 16bar S 20bar h1+h2 16bar h1+h2 20bar Weight 16bar Weight 20bar
inch mm mm mm mm mm kg kg
11/2 44.5 2.5 2.5 19.6 19.6 0.08 0.08
2 57 2.5 2.5 22 22 0.11 0.11
21/2 76.1 2.5 2.5 25.7 25.7 0.18 0.18
3 88.9 2.5 2.5 28.2 28.2 0.24 0.24
4 108 3 3 31.7 31.7 0.40 0.40
6 159 3 3.5 41 44 0.8 0.97
8 219 4 4.5 55 60 2.0 2.40
10 267 4.5 5.5 69 69 3.4 4.10
12 323.9 5.5 7 80 85 5.9 7.70
14 368 6.5 8 93 103 9.1 11.90
16 419 7 9 102 112 12.4 16.90
18 457.2 8 9.5 119 119 17.6 20.90
20 508 8.5 11 129 139 22.7 30.80
24 610 10.5 13 148 163 39.2 51.60
28 711 12 15 176 191 61.8 81.40
32 813 13..5 17 200 210 90.5 117.40
36 914 15..5 19 221 231 132.2 166.20

FAQ – Copper Nickel Pipe Cap

What is a Copper Nickel Pipe Cap?

A Copper Nickel Pipe Cap is a butt weld fitting used to close the end of a copper nickel pipeline. It is widely applied in marine seawater systems, offshore platforms, shipbuilding, and desalination plants.

What materials are available for Copper Nickel Pipe Caps?

Common materials include CuNi 90/10 (C70600), CuNi 70/30 (C71500), and CuNi10Fe1.6Mn. EEMUA 145 UNS C7060X material can also be supplied for marine and offshore piping projects.

What standards can Copper Nickel Pipe Caps be manufactured to?

We supply Copper Nickel Pipe Caps according to DIN 28011, EEMUA 146, and ASME B16.9 standards, depending on project requirements.

What is the size range of Copper Nickel Pipe Caps?

The standard size range is DN15–DN500. Custom sizes can also be manufactured based on drawings or specific engineering requirements.

What is the difference between CuNi 90/10 and CuNi 70/30 pipe caps?

CuNi 90/10 is commonly used for general seawater service with good corrosion resistance. CuNi 70/30 contains higher nickel content and provides superior resistance to high-velocity seawater and erosion corrosion, making it suitable for more demanding offshore environments.

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