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Iccp - Underground Pipe

Iccp - Underground Pipe

Iccp - Underground Pipe

Hi eryone,
in iccp design how to estimate the number of rectifier and how to choose their position along the pipe .
Thank you in advance

RE: Iccp - Underground Pipe

You hire a consultant trained in designing these systems.
It requires knowledge of the soils (and how conditions are likely to change) as well as the characteristics of different anodes and installation methods.
You can go to class on this subject, and in a few years you will know how to do it.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Iccp - Underground Pipe

Hi zjam,

In order to calculate the number of rectifiers and groundbeds required for an underground pipe installations there is much information required before the calculations can be done. This information would include where is the pipe going to be installed (I.E. desert, temperate, coastal etc.) Carrying out a pipeline survey along the pipe route, to include soil resistivity, ground acidity, and bacterial presence as a minimum. What size of pipe to be used. What length of pipe. What type of coating. Are there any existing pipes or services along the pipe route? Will the pipe cross any existing services. Are there any high voltage cable routes adjacent (within 1000m)or crossing the pipe?. Are there any other Direct Currents sources that may interact or interfere with the protection of your pipe?

There are many considerations to be considered when using Cathodic Protection for pipeline corrosion protection. Care must be taken to ensure not only getting the right number of rectifier and groundbeds, but to ensure other issues are mitigated such as AC and DC interference. I agree with Ed, retain the services of a competant Cathodic Protection Engineer to guide you through the process.

Hope this is of some help.

RE: Iccp - Underground Pipe

Agree with all the above.

Depending on the soil, the design, the resistivity, the coating, other pipelines etc etc you could have a T/R and ground bed every 10km up to every 100km or anywhere in between.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Iccp - Underground Pipe

NACE Peabody's spreadsheet is one to start with.

* Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?

RE: Iccp - Underground Pipe

Thanks to all for your answer
I am aware of some above recommendations and how to make the designs but still have some confusion about how often a CP transformer rectifier have to be installed along the pipeline I’m looking for the Mathematical formulation.

RE: Iccp - Underground Pipe

Your problem is that the formula requires inputs that you don't have.

CP is one of pipelines "dark arts" and it is not wise to try and sort cut this.

Employ an experienced CP engineer and do some surveys.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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