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Corrosion Control / Cathodic Protection Systems for Onshore Structures
Tanks:
Undertank CP Systems
We provide ICCP systems for any tank whether new build or existing retrofit, these can be laid using a piggyback loop or linear grid array of anodes, these are distributed over the soil side of tank base to ensure uniform current distribution & complete CP of the tank base.
A typical Undertank CP System will include:
• A standard transformer rectifier/power supply unit
• MMO anodes
• Permanent reference electrodes for monitoring
• An undertank tube for ventilation, watering and/or portable
measuring
Internal Tank CP Systems
We can design and provide a sacrificial or an impressed current CP system depending on the type of tank. Typically the following apply.
| Tank type | System type | Information | Typical system |
|---|---|---|---|
| Water Carrier | Sacrificial | Small diameter tanks, mid-range resistivity |
Aluminum, Magnesium or Zinc anodes |
| ICCP | Large diameter tanks Low resistivity - large current High resistivity - higher voltage |
MMO Titanium | |
| Chemical | Sacrificial | Generally not used as products & operating conditions can be particularly aggressive |
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| ICCP-Cathodic | High current requirement easier to control | ||
| ICCP-Anodic | Suitable for low ph & high temps, lower
power requirements, potential monitoring critical, hard to control |
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| Oil product storage tanks | Sacrificial | Used for water drop out | Magnesium or zinc anodes located on tank floor |
Pipelines
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We carry out a site survey & provide CP systems for buried & submerged pipelines.
As a rule of thumb the following could apply.
| Characteristics | CP system |
|---|---|
| 0-20 km length | Sacrificial |
| 20+ Km | Impressed |
| New plastic coating, new high grade coatings | Sacrificial |
| Old coatings | Impressed |
| Corrosive Soil | Impressed with temporary sacrificial during construction |
| During pipeline construction phase | Sacrificial |
Plants
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We supply CP systems for protecting in-plant piping from corrosion. Typically the following apply.
| Characteristics | Possible systems |
|---|---|
| Small pipeline sections | Sacrificial |
| Short well coated pipe | Sacrificial |
| Long lengths | Impressed |
| Multi pipelines | Impressed |
| Congested areas | Impressed - close distributed |
| New pipelines | Close anode wire |
| Retrofit | Multi Deepwells or distributed close anode |