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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

    SSPC-SP2

    SSPC SP-2 is not the standard for Galvanized Steel. So it doesn't mean that all galvanized surface need to be applied with SP-2 and there is no meaning. If roughness is the requirement you may go for SSPC SP16. Or, only if there are some bare spots or rust, you can go for SSPC SP-2.
  4. CoCoE

    Solid SS 316L vs. CS + clad SS 316L

    @Chumpes, What is within chloride level for SS? Is there such threshold? I would say Chloride SCC will still happen even though the chloride levels are even lower than 50 ppm. However NO OXYGEN is the key for me, and probability for chloride SCC is almost nil. Consequence is very high if a...
  5. 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...
  6. 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
  7. CoCoE

    Mixing Sand With Different Size in Sandblast

    mmbguide, 1. No 2. No (for expendable)
  8. CoCoE

    Is OES PMI required for dual certified 316/316L material?

    Dear Dennis van Zanten It doesn't look like a mandatory test for me! Note 2 says, "Carbon content shall be specified by the Owner's engineer"-> Is it specified? In either cases, we have nothing to do here. Next note says "XRF or OES or WCA MAY BE used if some undefined other methods differ...
  9. CoCoE

    Coating temperature limits

    Dear Brimmer, There is no such guidelines for coating selection followed in the industry. I have worked with Clients who requires coating to meet the design temperature. In my personal opinion, 10% than the max OT is quite sufficient and decent selection. Coco- NACE PCS
  10. CoCoE

    blasting

    Light blasting = brush off blast cleaning (SSPC SP-7)
  11. CoCoE

    Aluminium anode in Seawater

    @rachba I could not understand this "the current density and the breakdown factor affect the anode required number and not their lifetime". So do you mean there is no effect of coating break down factor on the life time of an SACP? It should be current demand based on area to be protected is...
  12. CoCoE

    Adhesion test and topcoating

    I hope your lead paint should be an epoxy. Since you need to really ensure the sound coating, as a coating specialist I would suggest to get at least 6MPa as the acceptance criteria. Regards
  13. 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
  14. CoCoE

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

    Sorry, TYPO! Solid duplex is finally selected. CocoE
  15. CoCoE

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

    Duplex clad is finally selected. CocoE
  16. CoCoE

    epoxy paint vs cr paint

    What is CR paint? Chlorinated Rubber? Where do you use these paint? Is the temperature same for all these applications? Please give more information -Coco
  17. CoCoE

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

    @Sjones, Sorry again for being late. What is separated? Gas How was the corrosion rate determined for a pressure vessel? using E.C.E Why is PWHT a showstopper? We experience a lot of worst cases. @Rob89, 12% Chlorides. Regards Coco
  18. CoCoE

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

    Hello, Sorry for replying late. @Edstainless, 1) Selection is not yet done. DSS is under consideration, but I can't use a clad vessel due to code PWHT. 2) This is for inlet separator and colescers where the similar fluid is passing. @SJones, 1)It contains CO2, and chlorides only. No oxygen...
  19. CoCoE

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

    @Edstanless and @Moltenmetal, Thanks a lot for the inputs. This is from deep well, and it does not contain any oxygen or sulphur. (ppb value of oxygen is unknown), so 'no oxygen' is design consideration. If I select DSS, I am worried about the PWHT of DSS clad, and if solid, it is expensive...
  20. CoCoE

    ZInc plating of wiremesh

    Dear Dik, Yeah mostly only non corrosive environment due to the factors I stated above, but I have seen electroplated "items" are used even on the exposed (I am not saying it really corrosive) locations where HDG may cause undesirable changes like clogs, lumps or uneven build. Electroplating or...

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