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  • Users: CoCoE
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  1. CoCoE

    Corrosion Inhibitor Efficiency

    Does CI can be carried over to the water saturated overhead stream even the separator is with a demister? Is there any good reference books for understanding about corrosion inhibitor effectiveness? Please give some guidance
  2. CoCoE

    H2S/H2SO4 Resistance of chlorinated butyl rubber and brominated butyl rubber

    Is there any good references for H2S/H2SO4 Resistance of chlorinated butyl rubber and brominated butyl rubber? I searched some NACE Papers and articles however no proper comparable data was available. Please guide me CoCoE
  3. CoCoE

    Corrosion Allowance of Plates in Plate Heat exchangers

    Do we need to consider Corrosion allowance for plates in plate heat exchangers if the plate is made of high alloys like Alloy C-276? I have a service which is coming in contact with 98% H2SO4 and no corrosion allowance is considered although the ISO Corrosion curve shows a corrosion of 0.13...
  4. CoCoE

    Corrosion Coupon /Probe Selection

    Dear experts, Please guide me with some general practice. Thanks in advance. How to select and decide the type of coupon from Flushed disc/Projected disc/Strip/rod for a particular service? How to decide if Only probe or Coupon+probe need to be specified? Regards Coco
  5. CoCoE

    Response Time For Corrosion Probe

    In what grounds we should fix the response time for corrosion probe? Is there any standard requirement against each element of different size? Please advise -coco
  6. CoCoE

    Pitting/ClSCC on 304/304L or 316/316L

    Hello, I really need some advise on this matter. In my knowledge chloride SCC, or pitting will not be caused by chlorides on Austenitic (considered here are SS 304 and SS316) stainless steels (ASS), if no oxygen or H2S is present and pH is around neutral. The presence of CO2 also will not...
  7. CoCoE

    Repairing Weathered Phenolic Epoxy

    I have someweathered phenolic epoxy coating from which rust has started coming out with a few cracks penetrating to the surface.As the first choice being an Owner, I am trying to explore the possibilities to repair from outside with out coating removal. Do someone have some way or suggestions...
  8. CoCoE

    Material Selection of Neutralizer Vessels

    Gentlemen, I am looking for a proper material selection for neutralizer vessel (either metallic or non metallic) which handles the spent caustic contains 5% NaOH and 98% H2SO4. There is continuous agitation from top, and pH range of spent caustic is around 12 to 13.5. which material will best...
  9. CoCoE

    Heat treatment to CRA Clad/Lined pipes/fittings

    I am very new to the materials, and I have 100s of doubts like below My query is based on the below definition. Cladded: CRA layer by EB, Hot rolling, or any other metallurgical bonds Lined: Mechanically bonded with seal welding on the ends 1.Is there any difference in performance between...
  10. CoCoE

    Armor Plate

    I am looking to contact Armor plate Vendor. No reply I am receiving for my messages!!! Can somebody help me please?/ COCOE
  11. CoCoE

    SS Cladding on High strength steel

    Hi all, Your advise is highly appreciated. Is there any limitation to apply cladding of 304L or 316L on high strength steels like ASTM A516 grade 70? Or can you discuss if any practical difficulties are expected? Thanks COCOE
  12. CoCoE

    Prevention of ESCC by CP

    Hi gents, I am here with an interesting query (May be only to me). Could someone help me? 1. Can ICCP prevent susceptible materials from ESCC? 2. Can Galvanic anodes prevent susceptible materials from ESCC? 3. NACE SP0198 specifies Al-foil as a prevention method for ESCC for SS. My question...
  13. CoCoE

    HTHA and H2-H2S Corrosion

    Hello my dear Fellow members, I am daily coming across both HTHA and H2-H2S Corrosion material review , and I do use the Nelson's curve and Couper Gorman curves for my selection. The question coming to me daily is that why don't we verify HTHA in an H2S containing environment? And Today my...
  14. CoCoE

    100% PUR coating for underground

    I have some items to be coated with 100% PUR coating, of 1500 micron for underground. Any one experienced in such coatings? Is there any Vendors in the middle east who is handling such jobs? I am first time hearing of such a coating for underground. I think it requires heating, and expected to...
  15. CoCoE

    Above ground, But buried

    What do you call a pipeline with a soil hump, which is on grade level but covered with soil? I remember during my earlier years there was a hard sand packing on the soil. Can anyone help me out in this? What are these terminologies?
  16. CoCoE

    CP & Coating

    I have seen a Company has specified MIO pigmented epoxy coating of DFT 500 microns for underground piping, which need to be cathodically protected. I would like to know the opinion /advise on the below things. 1. How good MIO epoxy can withstand the abrasion/pressure in buried condition...
  17. CoCoE

    DFT of MIO coating

    How to measure the DFT of MIO coatings? We know MIO is magnetic, and it may affect the reading of a magnetic DFT gauge. In this case, how we can measure the DFT (Non destrutive) ? Regards Cococa
  18. CoCoE

    Online internal coating repair

    Dear all, I have an underground piping of 4" carrying potable water, and having 3 90 Deg elbows. My concern is the damaged internal coating and the coloured water I am getting. I would like to get a coating repair solution for underground pipe internal surface without taking the pipe out from...
  19. CoCoE

    Hydrocyanic acid Corrosion

    In what extent staninless steels (316L or 304) are affected by Hydrocyanic acid corrosion? Anticipating a value of above 20 ppmw of HCN, how good 316 or 204 materials can resist the attack at 70 Deg C and at 120 Deg C? Is there any good corrosion data available in any books? I could not find...
  20. CoCoE

    FCAW for sour service

    Is there any reason behind the restriction of FCAW for sour service vessel fabrication? I could see some companies are not preferring FCAW or they are not allowing FCAW in sour service. If anyone knows the technical background, Kindly share. Cococa

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