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Integrity evaluation of offshore wind structures utilizing complementary monitoring techniques

Picture for Integrity evaluation of offshore wind structures utilizing complementary monitoring techniques
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To categorize the level of corrosion internally in uncoated offshore wind turbine structures a combination
of different online monitoring systems has successfully been utilized combining findings from online
corrosion monitoring, continuous water level monitoring and online water quality monitoring.

Product Number: 51323-19292-SG
Author: Annika Martina Diederichs, Anders Nilas Rosborg Black, Khadijeh Nastaran Jafari, Birit Buhr
Publication Date: 2023
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$20.00
$20.00

To categorize the level of corrosion internally in uncoated offshore wind turbine structures a combination
of different online monitoring systems has successfully been utilized combining findings from online
corrosion monitoring, continuous water level monitoring and online water quality monitoring.


Online water level monitoring is being used to identify leakage of the J-Tube seal and evaluating
corresponding corrosion risks as not all leakages can be identified by manual measurements, which are
typically only performed over a few hours. The findings of the water level monitoring are supplied with
water quality measurements as different levels of leaking will result in different levels of ingress of fresh
seawater with resulting different levels of dissolved oxygen in the water column. These parameters
characterizing the environment are then correlated to the corrosion rates measured by online corrosion
monitoring ultimately characterizing the associated corrosion risk of the measured structures.


This approach allows offshore wind turbine structures to be precisely categorized into different
populations with different associated corrosion risks, which is the base for evaluating mitigation activities.
Positions with a high corrosion risk and high level of ongoing corrosion can be recommended for retrofit
with anodes and positions with a lower risk can be followed using corrosion monitoring, which hence
serves as basis for evaluating if mitigation is needed at a later point in time. Further, Electrical Resistance
(ER) sensor technology can be used to document arrest of corrosion, where cathodic protection is used
as mitigation measure.

To categorize the level of corrosion internally in uncoated offshore wind turbine structures a combination
of different online monitoring systems has successfully been utilized combining findings from online
corrosion monitoring, continuous water level monitoring and online water quality monitoring.


Online water level monitoring is being used to identify leakage of the J-Tube seal and evaluating
corresponding corrosion risks as not all leakages can be identified by manual measurements, which are
typically only performed over a few hours. The findings of the water level monitoring are supplied with
water quality measurements as different levels of leaking will result in different levels of ingress of fresh
seawater with resulting different levels of dissolved oxygen in the water column. These parameters
characterizing the environment are then correlated to the corrosion rates measured by online corrosion
monitoring ultimately characterizing the associated corrosion risk of the measured structures.


This approach allows offshore wind turbine structures to be precisely categorized into different
populations with different associated corrosion risks, which is the base for evaluating mitigation activities.
Positions with a high corrosion risk and high level of ongoing corrosion can be recommended for retrofit
with anodes and positions with a lower risk can be followed using corrosion monitoring, which hence
serves as basis for evaluating if mitigation is needed at a later point in time. Further, Electrical Resistance
(ER) sensor technology can be used to document arrest of corrosion, where cathodic protection is used
as mitigation measure.

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