Copper-Nickel Seawater
Piping System Offshore product range:
Pipes, fittings and flanges Copper-Nickel
C70600 (CuNi 90/10)
Hundred years of
experience, a thorough understanding of the different industries’ specific
problems, a potent range of application-oriented products and services, plus
qualified technical advice and assistance, have been the bedrock of NUFIT’s
relations with its customers.
Marine Applications
NUFIT’s division Marine
Applications specializes in the production and supply of copper-nickel
alloys for seawater piping system. Since
decades, these alloys have successfully used in:
• Merchant and military
shipbuilding
• Offshore oil and gas
installations
• Coastal petroleum and
petrochemical processing plants
• Seawater desalination
plants
• Coastal electricity
generation plants
Copper-nickel alloys are widely applied in:
• Seawater cooling systems
• Fire water systems
• Sanitary systems
• Deck steam pipes
• Deluge systems
• Hydraulic and pneumatic
systems
• Seawater feed lines to
desalination and processing units
• Splash zone sheathing
Offshore Product Range
The Cupronickel C70600 (CuNi 90/10) offshore product
range is based on:
• EEMUA –144: 1987 Tubes -
Seamless and Welded
• EEMUA –145: 1987 Flanges
• EEMUA –146: 1987
Fittings
Comparison of Standard Specifications for Copper-Nickel
C70600 (CuNi 90/10)
Element
|
DIN CEN/TS
13388
CW352H
|
DIN 86019
WL 2.1972
|
BS 28711)
CN 102
|
DIN EN
12449
|
EEMUA
144-1987
UNS C 7060x
|
MIL-T-16420K
ASTM B 4662)
C 70620
|
JIS H3300
C 7060 T
|
Ni %
|
9.0–11.0
|
9.0–11.0
|
10.0–11.0
|
9.0–11.0
|
10.0–11.0
|
9.0–11.0
|
9.0–11.0
|
Fe %
|
1.0–2.0
|
1.5–1.8
|
1.0–2.0
|
1.0–2.0
|
1.5–2.0*
|
1.0–1.8
|
1.0–1.8
|
Mn %
|
0.5–1.0
|
0.5–1.0
|
0.5–1.0
|
0.5–1.0
|
0.5–1.0
|
max. 1.0
|
0.2–1.0
|
C%
|
max. 0.05
|
max. 0.05
|
max. 0.05
|
max. 0.05
|
max. 0.05
|
max. 0.05
|
–
|
Pb %
|
max. 0.02
|
max. 0.01
|
max. 0.01
|
max. 0.02
|
max. 0.01
|
max. 0.02
|
max. 0.05
|
S%
|
max. 0.05
|
max. 0.005
|
max. 0.05
|
max. 0.05
|
max. 0.02
|
max. 0.02
|
–
|
P%
|
max. 0.02
|
max. 0.02
|
–
|
max. 0.02
|
max. 0.02
|
max. 0.02
|
–
|
Zn %
|
max. 0.50
|
max. 0.05
|
–
|
max. 0.50
|
max. 0.20
|
max. 0.50
|
max. 0.50
|
Sn %
|
–
|
–
|
max. 0.03
|
–
|
–
|
–
|
|
other imp.
|
max. 0.20
|
max. 0.20
|
max. 0.30
|
max. 0.20
|
max. 0.30
|
–
|
–
|
Cu %
|
rem.
|
rem.
|
rem.
|
rem.
|
rem.
|
rem.
|
+Ni+Fe+Mn
min. 99.5
|
1) no longer valid
2) equal to C 70600 for subsequent welding
* The iron content has been specified to improve corrosion resistance
DESIGN SCOPE
Working pressures and temperatures of components
included in this specification:
1. 16 bar/232 psi:
-29°C/-20°F to +75°C/+167°F
2.20 bar/290 psi:
-29°C/-20°F to +38°C/+100°F
Pipes Seamless and Welded:
• Pipes are based on BS MA
60, DIN 86007, and ANSI/ASME B31.3
• The wall thicknesses
comply with ANSI B31.3 and DIN 86007 as well as International Association of
Classification Societies with additional allowances for robustness to withstand
mechanical damage, especially in the smaller sizes.
• The fit-for-purpose
corrosion allowance of 0.5 mm sufficient for entire service life of the piping
installation has been included. This corrosion allowance is in accordance with
all major classification societies specified for alloys containing ≥10 wt. % Ni
and ≥1.5 wt. % Fe.
Flanges Composite and Solid:
• Included series of
composite (lap type) and solid flanges in metric dimensions based on ANSI
B16.5, MSS SP-44 and BS 1560
• The basic metric
dimensions for drilling and flange outside diameters are those given in ANSI
B16.5 and MSS SP 44 Class 150 rating with inch size bolting.
• The copper-nickel stub
end and flange joint faces are machine finished and comply with the
corresponding Sections of EEMUA 145.
Fittings:
• The specification
comprises a series for pipe fittings including butt weld, socket welding,
capillary brazing, threaded, self-reinforced fittings as well as saddle pieces.
• The “building in” dimensions
of the butt welding fittings are based on ANSI B16.9 apart from the caps that
are based on DIN 28011 (with suitable amendments).
Welding
The welding consumables
used for the manufacturing of welded components are in accordance with AWS-A5.7
Class ER CuNi. The welding procedure specification and welder qualification are
in accordance with ASME code, section IX.
Testing of Welds
The weld seams are
examined by the liquid dye penetrant testing in accordance with ASME code,
section VIII, division 1,
appendix 8. The radiographic examination is performed for the complete
length of each weld to
meet the requirements of ASME code, section VIII, UW51.
Gaskets
The gaskets normally used
with flanges are those made from aramid fibre with nitrile binder in accordance
with ASME B16.21 or equivalent. The gasket hardness shall not be less than 75
Shore. The gaskets shall not be graphited. In order to ensure adequate seating
when solid weldneck and solid slip-on flanges are used, irrespective of gasket
materials, the gaskets shall be located within the bolt circle. Note: Gaskets
should not be used when mating with elastomer l rubber faced flanges.
