Cathodic Protection
Leading provider of cathodic protection solutions
Corrosion remains one of the most persistent challenges in infrastructure, quietly compromising the strength, safety and longevity of vital assets.
From pipelines and offshore platforms to bridges and wind turbines, structures are constantly exposed to environmental forces that cause gradual, often unseen, deterioration.
If left unmanaged, corrosion can lead to critical performance failures, environmental damage, and significant financial consequences. That’s why proactive corrosion control is essential to maintain operational reliability and extend asset life.
Cathodic protection (CP) is a cornerstone in the global fight against corrosion. Trusted across industries for its reliability and effectiveness, CP acts as a protective barrier, shielding metal structures from corrosive forces. By utilising sacrificial anodes or impressed current systems, CP actively redirects electrochemical activity, preventing corrosion from taking hold on key infrastructure components.
Protecting infrastructure from corrosion isn’t just maintenance, it’s preservation. Our Cathodic Protection Surveys deliver precise diagnostics to ensure long-term integrity and compliance.
Full life cycle solutions
Consultation, FEED (front end engineering design) and supply of CP systems
Installation and commissioning management
Maritime dry-dock integrity checks
ICCP system healthcare
CP survey and evaluation/auditing of existing systems
Interference, evaluation and mitigation studies
Comprehensive data analysis, management and continuous monitoring
Corrosion root cause investigation and simulation studies
Long-term simulation of gathered data
CP life-extension and retrofit systems
Engineering techniques
We provide comprehensive cathodic protection engineering solutions for both marine and land-based applications.
With extensive expertise in galvanic anode and impressed current systems, we offer tailored solutions that empower industries to tackle corrosion effectively. As a trusted partner, Altrad supports our clients throughout the entire process, ensuring long-term asset protection and performance.
Services include:
Site Survey and Data Gathering
Design and Engineering
Installation and Commissioning
Troubleshooting and System Optimisation
Routine Specialised Testing and Monitoring Services
Interference Evaluation and Mitigation Studies
Comprehensive Data Analysis, Management and Continuous Monitoring
CP Life Extension Studies
Full Life Cycle Support
Review of requirements and site surveys
Detailed designs tailored to our client’s requirements
Installation management
System commissioning and handover
Routine and specialised testing and monitoring
Troubleshooting and system optimisation
System health checks and maintenance
Data management and reporting
Simulation studies and consultancy
Life extension assessments
Simulation and modelling
Retrofit design and implementation
Maintenance and monitoring programs
System upgrades with the latest innovative solutions
CP survey techniques
In the ever-evolving landscape of infrastructure management, ensuring the integrity and longevity of critical assets is paramount. Cathodic protection survey plays a pivotal role in this endeavour, serving as a vital tool to assess, diagnose and address corrosion threats.
With an excess of over 70,000km of pipelines and thousands of structures surveyed globally, we’ve delivered industry leading reliability and provided actionable insights empowering our clients to mitigate risks, extend their asset’s lifespan and ensure operational reliability, all while achieving regulatory compliance.
Subsea Survey Solutions
Subsea CP Survey System (subCAPSS)
Continuous measurement of CP potential, field gradient and current density
Detect active coating damage
Calculate anode current output and remaining life predictions
Does not require continuous contact with the pipeline
Proven equipment reliability and robust design
CP and FG value can be displayed real time on video overlay
Temperature & resistivity measurements
Trailing Wire Survey
Measurement of pipeline CP potential
Allows for rapid rate of survey
Generally adopted for CP inspections of shallow water pipeline shore approaches, where vessels and work class ROV cannot operate
Close Interval Proximity Survey (CIPS)
Above ground, non-intrusive survey
Accurately determine the effectiveness of a cathodic protection system along the entire buried or immersed pipeline route
Both ‘On’ and ‘Instant Off’ potentials recorded
Pipe to soil potentials are measured at nominal 1-2m intervals
Comparison with static, potential/ time plots indicates if stray current is present
Soil Resistivity Testing Dropcell Survey
Assess the corrosiveness of the soil
Measurement recorded in the field
Essential parameter for CP design calculations
Measurement of asset CP potential
Commonly used for ports and harbours, vessels and monopiles
Direct Current Voltage Gradient (DCVG)
Above ground, non-intrusive survey
Provides an accurate detection of coating defects by means of measuring voltage gradients within the soil
Can be used to estimate the size of a coating defect
Remote Monitoring Systems Diver Probe
Remote monitoring systems are designed to allow continuous monitoring of CP systems
Real time data captured remotely
Data analysis and automated digital reporting
Increased asset integrity and lifetime due to outages being detected earlier
The CP diver probe is designed to allow a diver to make quick, convenient Cathodic Protection (CP) measurements of underwater structures
Compact, rugged designed tool for use with any diver survey on pipelines, harbours ships or oil and gas platforms
Facility Offshore Wind Farm
Location North Sea
HSEQ
PROJECT OVERVIEW
Altrad ’s experts were contracted to perform a cathodic protection dip/drop cell survey at an offshore wind farm based in the North Sea.
No loss of time incidents
THE DESCRIPTION
Our cathodic protection and corrosion surveys provide critical data to help understand the effectiveness of the asset’s cathodic protection system. This determines if corrosion is fully arrested. In turn CP provides asset owners with assurance on the long term health of their assets.
THE SOLUTION
Altrad efficiently mobilised highly competent personnel to site, despite challenging sea and weather conditions, successfully surveyed 19 monopiles.
The final report, which was put through a stringent twostage verification process by our data analysis and report writing team, to ensure accuracy and reliability, was delivered to the client within only a few days.
THE RESULT
Work was completed to the highest standards and within the client’s expected time frame and budget.
By carrying out this cathodic protection survey it was confirmed that all monopiles were well protected against external corrosion.
Being proactive and flexible throughout the planning of the project, enabled us to support and manage the requirements and challenges faced with operations during the Covid-19 pandemic.
As a partner of choice, Altrad is now supporting further cathodic protection survey requirements at the same offshore wind farm.
