Cathodic protection (CP) plays a critical role in extending the life of metallic infrastructure across sectors such as oil and gas, energy, utilities, marine, and transportation. From buried pipelines in the UK to offshore platforms across Europe, CP ensures asset reliability, regulatory compliance, and cost control.
Two principal systems are commonly employed: Impressed Current Cathodic Protection (ICCP) and Galvanic Anode Cathodic Protection (SACP). Each has distinct advantages, applications, and cost profiles.
At Corrpro Europe, we assess every project based on technical, environmental, and lifecycle demands to deliver tailored, standards-compliant CP solutions.
Understanding Galvanic Anode Cathodic Protection (SACP)
SACP systems use galvanic anodes, typically magnesium, zinc, or aluminium, that are more electrochemically active than steel. Once connected, these anodes corrode preferentially, generating protective current that shifts the potential of the structure into the cathodic range.
This passive, power-independent method is ideal for smaller or isolated installations. It’s commonly deployed across buried pipelines in remote UK regions and in marine applications like hulls and risers across Europe. While straightforward and cost-effective upfront, SACP systems require regular anode replacement and may not scale efficiently for large or high-demand structures.
Corrpro Europe supplies SACP systems built around our Aloline® and Zincoline™ anodes, engineered for dependable performance in a range of operating environments.
Exploring Impressed Current Cathodic Protection (ICCP)
ICCP systems use a DC power supply to drive current from long-life anodes such as mixed metal oxide (MMO) or high-silicon cast iron. A rectifier converts AC to DC, allowing the protective current to be continuously maintained and adjusted as needed. This makes ICCP ideal for cross-country pipelines, offshore platforms in the North Sea, and plant applications.
One of ICCP’s biggest strengths lies in its ability to be monitored and adjusted remotely. Corrpro’s Hockway™ rectifiers and our RMCS platforms provide operators with real-time visibility and control, enhancing performance while reducing site visits and maintenance overheads.
Although ICCP systems require higher upfront investment and access to power, their long service life (often 20–30+ years) and reliability offer long-term value and reduced total cost of ownership.
Choosing the Right System: Key Factors
Selecting between SACP and ICCP depends on your project’s specific technical and environmental profile:
- Smaller, well-coated or isolated structures may benefit from the simplicity of SACP.
- Large, high-demand, or poorly coated structures often require the scalable, controllable nature of ICCP.
- High-resistivity soils or dry, rocky terrain limit galvanic effectiveness, while ICCP delivers consistent performance.
- If your asset is in a remote area without power, or CP interference is a risk, SACP may be more practical. Where power is available, ICCP gives better control and flexibility.
- Lifecycle cost calculation is essential. Corrpro Europe supports clients with detailed Total Cost of Ownership (TCO) analysis to ensure best-fit investment decisions.
Hybrid CP Systems
A hybrid approach often yields the most resilient solution. Offshore platforms, for example, may use galvanic anodes to protect shielded areas. Corrpro Europe has also led retrofit projects where ageing SACP systems were supplemented with ICCP to meet new performance demands.
Why Corrpro Europe?
Corrpro Europe provides end-to-end cathodic protection solutions, with in-house manufacturing and ICorr/Ampp-certified teams. We deliver:
- Engineering and technical consultation
- GACP and ICCP product systems
- Full lifecycle support across the UK and Europe
All solutions meet and exceed ISO 15589-1, EN 12954, and AMPP SP0169 standards.
FAQs
Which method is more popular, ICCP or galvanic?
Both are widely used. Galvanic anodes are very common for shorter pipelines, tank internal protection, and marine structures like smaller boats. ICCP is common for large infrastructure: long pipelines, larger ships, offshore rigs, and reinforced concrete protection. Often, new pipelines implemented with ICCP if they are long; short distribution networks or LNG Tanks might use magnesium anodes. It really depends on the application scale.
Can I switch from galvanic anodes to ICCP later?
Yes. Retrofit from galvanic to ICCP is possible and not uncommon. For example, ageing offshore platforms have had retrofit ICCP systems installed when their original sacrificial anodes neared depletion. For a pipeline, one can add rectifiers and impressed current groundbeds even if it initially had only sacrificial anodes – the old anodes will simply become part of the cathodically protected system . The reverse (ICCP to galvanic) is less common but could be done on a small scale if power becomes unavailable.
What maintenance do sacrificial anodes require?
Primarily inspection and periodic replacement. If the anodes are accessible (like on a ship hull during drydock or in a tank during shutdown), visual checks can estimate how much anode remains (often measured as % remaining). If pipe potentials begin to trend less negative, it may suggest that the anodes are nearing depletion.) Regular monitoring and timely advice help ensure continued protection. There’s usually no day-to-day action needed – just plan to swap them out before they’re completely consumed to avoid a lapse in protection.
Do impressed current systems need constant monitoring?
They do benefit from regular monitoring. Many ICCP systems include alarm indicators if something is wrong (like circuit failure). Without remote monitoring, rectifier operation should be checked typically monthly to ensure proper functioning. With remote monitoring, you can be automatically notified if, say, a rectifier trips or a potential drifts out of range. Also, ICCP systems need periodic checks of wiring and structure connections, and perhaps calibration of the reference electrode control if used. While it’s not overly demanding, an ICCP system does require regular monitoring and can’t be neglected for years the way a galvanic anode might.
Is one method more compliant with standards or regulations?
Standards like ISO 15589-1, AMPP SP0169, EN 12954 etc., do not mandate one method over the other, they give requirements for whichever method is chosen. Regulators care that the pipeline or structure is adequately protected against corrosion. It’s up to the design to meet that using galvanic, ICCP or combination. For example, ISO 15589-1 provides guidance on designing both galvanic and ICCP for onshore pipelines. So, compliance is about achieving protective potentials and system reliability, not about the method itself. Both methods, when properly applied, are accepted practice.
Contact Corrpro Europe
There’s no one-size-fits-all answer in cathodic protection. Corrpro Europe’s engineering-led approach ensures the right system, ICCP, SACP, or hybrid, is tailored to each asset’s specific requirements.
Contact Corrpro Europe today to arrange a consultation and protect your infrastructure with proven CP systems backed by decades of expertise.
About the Author
Ad at a curabitur et ullamcorper condimentum a sodales a convallis elit class a curabitur aenean velit orci auctor suspendisse viverra urna nostra ultrices sem blandit scelerisque a.Parturient suspendisse curae metus sed potenti adipiscing odio consectetur condimentum blandit scelerisque.
