Find the most up-to-date version of DNV-RP-B at Engineering Find the most up-to-date version of DNVGL – DNV-RP-B at Engineering DNV-RP-B CATHODIC PROTECTION DESIGN JANUARY Since issued in print (January ), this booklet has been amended, latest in October .
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Do let me know if you need any clarifications. So you consider the influence of the coating for the first 3 years and for the remainder, calculate without it. I am hoping someone could elaborate the following part, ‘When the design life of the CP system exceeds the actual calculated life of the coating system according to 6.
By joining you are opting in to receive e-mail. What’s the point in having anodes lasting longer than the coating?
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You should size the anodes based on an assumed amount of coating damage and a anode lifetime. I’d say that if you don’t know a, b and t, you should not be trying to use equation 3.
The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs. Promoting, selling, recruiting, coursework and thesis posting is forbidden. You probably should also know what b is.
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DNV-RP-B CATHODIC PROTECTION SYSTEM – Off-shore structure engineering – Eng-Tips
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Close this window and log in. I think the Cathodic Protection Systems were designed previously without considering the influence of coating on the corrosion behavior.
Click Here to join Eng-Tips and talk with 4b01 members! Another factor is periodic cleaning of marine growth in this zone.
Kind regards, Sadik Hussain. Red Flag This Post Please let us know here why this post is inappropriate.
Students Click Here Join Us! So the point is basically that you need two sets of design lifeone for CP sytem and the other for the coating you apply to the structure. What has been done looks like two calculations, picking the biggest number.
Such issues are the result of project complexity, size, uniqueness and dnf, as well as the need for virtual team collaboration. Biginch, Yes it would be preferable if you size the anodes based on the coating life.
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The effect dnf marine growth is highest in the upper 30 meters where wave forces may further contribute to coating degradation. Are you an Engineering professional? But over the last few years Coatings have been found useful in contributing ro to the CP dnnv which led to a considerable reduction in the usage of anodes.
The Eng-Tips staff will check this out and take appropriate action. Below is the statement: Ideally you would like both durations to be similar since it is beneficial to replace them together. When the design life of the CP system exceeds the actual calculated life of the coating system according to 6.
It appears that you need to know a and t to do this problem. That’s what you want to do? It’s easy to join and it’s free. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Kind regards, Sadik Hussain RE: So this lead to increased demand on the number of anodes and pr design current etc.
As a simple engineering g401, fc can be expressed as: But then how do we calculate t if we don’t know f in eq 3. But sometimes Owners tend to specify different durations say 5 years for the anodes and 3 for the coating.