Reliability of Cathodic Protection System

Post by **ashfaqanwer** » 04 Apr 2010, 10:22

What are the main checks to be applied for assuring health of Cathodic Protection System? Can anybody enlist the same? Any code reference would help in great deal.

Post by **Nabeel Ahmed Qureshi** » 10 Apr 2010, 06:48

Cathodic protection system is usually employeed for the protection of underground piping systems against corrosion. Regular check up of Cathodic protection system is very necessary as its malfunctioning / improper health has a direct link with intwgrity of underground piping. Following checks are usually employeed for the health check up of any cathodic protection system.
1)- Pipe to Soil potential Survey @ a frequency of 3 months (less or more frequency can be employeed depending on the conditions & as per owner's descretion)
2)- Rectifier output current & voltage to be measured @ a frequency of 2 months (less or more frequency can be employeed as per owner's descretion)
3)- Anode bed current to be measured @ a frequency of 2 months (less or more frequency can be employeed as per owner's descretion)
4)- For cross country pipelines or plant underground piping which have isolation flanges shall be checked for any current leaks & any descripency shall be rectified. Frequency of this check shall be defined by owner himself. However, in many industries it is practiced at a frequency of 6 ~ 12 months.
5)- Proper upkeep of Cathodic protection posts is also mandatory.
For details one can refer NACE standard RP0169-20002 Standard Recommended Practice (Control of corrosion on underground or submerged metallic piping systems.

Post by **ashfaqanwer** » 13 Apr 2010, 04:54

Thanks for the useful reply.
Any API on cathodic protection system?

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