Main Benefits
The major benefit is that installation cost of the mat can be leveraged to the life extension of the asset, providing significant cost savings.
The ultra rugged and stable construction of the mattress provides a long-term stable retrofit platform to suit any bottom conditions.
CP-Mat will work anywhere that a steel or reinforced
concrete structure has to be stabilized in a submerged
situation.
Applications
Pipeline Crossings
The CP Mat is ideal
for pipeline crossings; in conjunction with standard
concrete mattresses, the CP Mat can provide extra CP
for the pipeline being crossed, as well as for the
new pipeline. The CP provided can add a “free” CP
retrofit of up to 20 years, with minimal additional
installation time required.
Pipeline River
Crossings
In the case of a
river crossing, installing one or more CP Mats can
provide additional CP for the pipeline section
underwater, where coatings tend to be damaged and
pipelines are often underprotected. The additional
CP Mats also provide the same added stability to the
pipeline as the standard concrete mattress.
Pipeline CP
Retrofits
The CP Mat is an
excellent solution for the retrofit of an aging or
damaged pipeline. If a pipeline or its coating has
been damaged, placing the Mat directly over the
damaged area or holiday directs cathodic protection
specifically to the required area. When retrofitting
older pipelines installed without a concrete weight
coat, the CP Mat provides ballast to stabilize
pipeline movement. Smaller diameter flowlines and
shortrun pipelines can also benefit from he ballast
provided with a CP Mat. The stability of the
mattress also makes installation feasible in all
types of harsh environments, where strong currents
are a concern.
The tieback to the
pipeline can be made via ROV or Diver, thanks to
Deepwater’s RetroClamp system. For more information
on RetroClamp, visit
www.stoprust.com.
Sheet Pile Bulkheads
The CP Mat will work
anywhere that a steel or reinforced concrete
structure has to be stabilized in a submerged
situation. The integral anodes of the Mat can
provide significant supplemental CP to a sheet pile
bulkhead. As the sea-side of the bulkhead typically
experiences more extensive corrosion than the
shore-side, it is beneficial to direct extra CP to
this side. The mattress also provides superior low
profile CP to prevent underprotection and scour in
shallow water.
Wind Farm Retrofits
The CP Mat is also a
solution for retrofitting offshore wind turbines,
where shallow water and scour have proven to be
difficult for traditional CP solutions. The
low-profile mattress works well in this environment,
and the added ballast proves adequate for preventing
scour.
|
Sample Design Guide |
|
|
|
A
|
B |
C |
D |
|
25% Anode Fill |
50% Anode Fill |
75% Anode Fill |
100% Anode Fill |
|
Sample Mat
Type |
A
|
B
|
C
|
D
|
|
Spacing (ft)
in seawater |
12425
|
16093
|
17416
|
18144
|
|
Spacing (ft)
in buried |
9691
|
12505
|
13370
|
13841
|
|
Anode life
(yrs) in seawater |
15
|
19
|
24
|
30
|
|
Anode life
(yrs) buried |
21
|
30
|
40
|
51
|
|
Amps
delivered in seawater |
3.2
|
4.9
|
5.8
|
6.4
|
|
Amps
delivered buried |
2.2
|
3.2
|
3.5
|
3.8
|
Design based on 12.75 in OD pipeline. Pipeline not
buried (5mA / sq ft). 2.5% bare (coating).
