Pipeline cathodic over protected
Pipeline cathodic over protected
(OP)
Dear expert .
We work in new construction (12 inch) pipeline 3 km with 3LPE coating.
The method we are used in cathodic protection is Sacrificial anode.
We make 4 Test points .
The potential (CSE) is around -1600 mv ( pipe over protected)
Please advise if there some risk of coating disbanding?
Thanks in advance for your advise
We work in new construction (12 inch) pipeline 3 km with 3LPE coating.
The method we are used in cathodic protection is Sacrificial anode.
We make 4 Test points .
The potential (CSE) is around -1600 mv ( pipe over protected)
Please advise if there some risk of coating disbanding?
Thanks in advance for your advise
RE: Pipeline cathodic over protected
How are you measuring the voltage? What reference cell are you using?
They seem very high / not possible with a sacrificial anode.
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RE: Pipeline cathodic over protected
Cu/CuSO4 reference electrode
The number Mg anodes is 100 anodes (7kg) spacing approximately 30 metres
thanks
RE: Pipeline cathodic over protected
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: Pipeline cathodic over protected
Go back to the CP designer.
Or go and disconnect about 80% of the anodes.
I think 1300 or 1350 is the most you want.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline cathodic over protected
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: Pipeline cathodic over protected
Are these attached separately every 30m?
Basically your design sounds like it is massively over specifed and without easy access to each anode or bunch of anodes it will be difficult to adjust.
Normally you put 4 or 6 anodes in the same place and run them through a test post so that you can test and adjust. Sounds like someone more used to offshore pipelines designed this one....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline cathodic over protected
RE: Pipeline cathodic over protected
Well that will make it easier to adjust but 25 7kg anodes in one location for a new 12" pipeline is extraordinary. 4 or 5 would be more normal.
The current demand will be very low so you might end up with a high resistance the get the voltage down.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline cathodic over protected
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: Pipeline cathodic over protected
RE: Pipeline cathodic over protected