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Recent content by rachba

  1. rachba

    Aluminium anode in Seawater

    @ SJones: I am working with our customer standard which specify a current density equal to 0.5 mA/m² for internal coated tank. This current density seems to be very low (not realistic for me) and may require a frequent maintenance of the coating , i already send a clarification about that to the...
  2. rachba

    Aluminium anode in Seawater

    Hi, @ SJones: My calculation of the design life of the anode is based on the following formulas: L= (one anode weight*utilization factor* effeciency) / (one anode current output * consumption rate of anode) Anode current output depend only on the dimension of the anode, its weight and the...
  3. rachba

    Aluminium anode in Seawater

    Hi, For a seawater storage tank i am using a sacrificial Aluminium anodes system to protect the internal submerged surface. Is it normal that when i calculate anode life the result is about 2 years (depending on the dimension of the chosen anodes). according to the calculation formulas and due...
  4. rachba

    Isolating Kit requirement

    the attached Image resume the exact situation that i'am dealing with. I understand that normaly in this case there is no cathodic protection loss but my client is not convinced and would like a reference or a standard confirming this point. please If someone of you has the reference that I seek...
  5. rachba

    Isolating Kit requirement

    In my case, I have a piping system located in a terminal station, several small separated parts of the pipe are buried . A galvanic cathodic protection system is deisgned to protect these small portion of buried pipe. Is it necessary to place isolating kit between the buried and aerial parts?
  6. rachba

    Isolating Kit requirement

    Hi, For a short length of buried pipeline, I will use a galvanic cathodic protection system by connecting a Mg anodes. Is it necessary to place an isolating kit on the extremity of the pipe or this is not required because it is not a ICCP system.
  7. rachba

    CP Attenuation

    Unfortunately in the source I did not find the information because it takes an example where the draining point is placed in the extremity of the pipeline.
  8. rachba

    CP Attenuation

    Hi, For the cathodic protection design of 200 Km of pipeline i used the the following formula to calculate the protected length: L_max=Acosh[(Es)/(El)]/α the L calculated is the total protected length or the length of protection in one direction from the draining point??? meaning if my draining...
  9. rachba

    cathodic protection design

    Hi, I will design a cathodic protection system for an already existing tank with a 100m of diameter, under the tank at 500mm depth a layer of PE sheet is spread entirely so - because it's not a new tank i can't use the grid anode under the tank - because of the PE layer I can't use the beep...
  10. rachba

    Anode Groundbed type

    Thanks
  11. rachba

    Anode Groundbed type

    Hi, I would like to know how we can choose the best type of groundbed for the design of cathodic protection system for buried pipeline ( conventional, distributed or deep groundbed). Thanks
  12. rachba

    Waard Model for corrosion

    Hi is it possible to use the Waard model to predict CO2 corrosion in pipline carring only water thanks
  13. rachba

    Waard Model for corrosion allowance

    Thank you Steve!!
  14. rachba

    NACE standards for a pump

    the Max system pressure is 20bar (290psi) --> partial pressure (psi)= 290*0.016/100=0.0464psi and if i refer to the Part3; A-7-2 table A.24 for duplex stainless steels Max partial pressure of H2S is 1.5 psi ---> so my pump in duplex is responding to the NACE requirement I hope this is right and...
  15. rachba

    NACE standards for a pump

    I have 160ppm of H2S so if we suppose a ideal gas 160ppm -> 0.00016 volume fraction -> 0.00016 molar fraction --> 0.00016*100= 0.016%mole i have the total pressure so the partial pressure= Pt*%mole is it right? Tanks
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