Cathodic protection standards
NACE International's Corrosion Control of Submerged Areas of Permanently Installed Steel Offshore Structures (SP0176-2007)
|
Reference Electrode |
Protection Standard |
|
Saturated CSE Electrode |
-850mv or more negative between -1200mv |
|
Ag/AgCl (Seawater) |
-750mv or more negative between -1100mv |
|
Ag/AgCl (Saturated KCl) |
-760mv or more negative between -1110mv |
|
SCE Electrode |
-780mv or more negative between 1130mv |
|
High-Purity Zinc Electrode |
+250mv or less positive |
NACE International's Control of External Corrosion on Underground or Submerged Metallic Piping Systems (SP0169-2007)
|
Measurement |
Protection Standard |
|
ON Potential (under CP) |
-850 mv or more negative between -1200mv
(Using CSE reference electrode) |
|
OFF Potential (Polarized Structure Potential) |
-850 mv or more negative between -1200mv
(Using CSE reference electrode) |
|
A minimum of 100 mV of cathodic polarization between the structure surface and a stable reference electrode contacting the electrolyte. |
Different type of reference electrode |
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Special Cases:
1.Standards may differ when Sulfide, Anaerobic Bacteria, high temperature and low PH soil are present
2.Standards may differ in cement wrapped pipe, pipes in dry or aerated soil
Do contact us for further enquiry |
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