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  1. rscosta1976

    Alloy 825 behavior under gas production environments

    Yes. Sorry Steve, The project team is still sorting out all operating cases for the next 15 years. We are still in an early stage of the revamp project. Thank you very much for all your insights.
  2. rscosta1976

    Alloy 825 behavior under gas production environments

    Thank you for sharing your experience and insights on this matter Steve. We are considering to go ahead with some lab tests as well. The expected Cl content of produced water is around 220,000ppm and significant quantities of heavy sludge, constituted by sand and halite scale deposits in...
  3. rscosta1976

    Alloy 825 behavior under gas production environments

    Greeting, After additional searching, I was able to find a few papers that shed some light on the pitting corrosion resistance of alloy 825 is gas producing environments in sour environments containing reasonable amount of CO2 and also high chloride content in the produced water. Rincon...
  4. rscosta1976

    Alloy 825 behavior under gas production environments

    Thank you all for your kind responses. I do apologize for my late reply. @SJones, Were any of the alloy 825 corrosion tests results published in the literature (papers, journals, etc)? I have search the most common literature sources and I couldn't find anything relevant. Please let me know, as...
  5. rscosta1976

    Alloy 825 behavior under gas production environments

    Gentlemen, Your thoughts would be appreciated regarding the pitting resistance of alloy 825 under the below service conditions for an gas producing inlet manifold, piping and slug catcher. H2S: 3%mol CO2: 5%mol Temperature: 150 F Pressure: 650 psig Chloride content (of produced water)...
  6. rscosta1976

    hot dip galvanized bolts forbidden on Stainless Steel vessel?

    Thank you WKTaylor I'm indeed not aware of any of the standards/ RPs you pointed. I will check it out and try to learn something. So do any of these actually prohibit HDG fasteners due to incorrect torque concerns? Thank you
  7. rscosta1976

    Valve types - pockets

    I agree that removing valves prior to hydrotesting is the best approach. We implement this measure as far as practically possible. However, there are many valves that cannot be removed (or are not practical to be remove), including welded ones. For those it is not easy to find efficient...
  8. rscosta1976

    Valve types - pockets

    Thank LittleInch, I share your concerns regarding proper water treatment for hydrotesting water and lay-up requirements to be mandated afterwards. We have strong requirements for this, but in same cases we've still detected excessive corrosion of valve trims (especially 400 series and some 300...
  9. rscosta1976

    hot dip galvanized bolts forbidden on Stainless Steel vessel?

    Fluoropolymer coated fasteners are being specified in several of our projects requiring high corrosion resistance at near shore or offshore areas. I'm not aware of any issues entailing fasteners coming loose, provided the required torque is applied. Thank you Steve for sharing such an...
  10. rscosta1976

    Valve types - pockets

    Good afternoon, I'm not a valve SME and would appreciate your thoughts on the issue below. During hydrotesting of plant piping circuits tested with valves already assembled, some valve types are prone to excessive water accumulation that can hardly be drained following the pressure test...
  11. rscosta1976

    Refinery product corrosion effeect

    Your description it is not very clear. Are you asking about CDU overhead system IOWs? To define IOWs one needs to consider materials of construction, configuration of your specific unit, normal operating conditions, feed source, feed rate, etc., just to name a few aspects to take into...
  12. rscosta1976

    ControTrace heating panels - does it suffer CUI?

    Greeting, Your thoughts would be appreciated to shed some light on the possibility of having Corrosion Under Insulation (CUI) on the ControTrace heating panels. These are supplied in bare condition. Although the highest risk of CUI is occurring in the temperature interval of 170 °F to 230 °F...
  13. rscosta1976

    CDU neutralizer amine injection

    Thank you Luis. I wonder if you are using such systems and what is your experience. I truly appreciate your thoughts on this. Regards, Ricardo
  14. rscosta1976

    Heat Exchanger Tubes

    Without more details it is hard to provide a good answer. There is no question that either copper alloys, super duplex SS and other corrosion resistant alloys would offer great benefits over carbon steel. However, I can think of cases where carbon steel utilization is acceptable depending of...
  15. rscosta1976

    CDU neutralizer amine injection

    Good morning all, I wonder if you can share experiences about the neutralizer amine injection system used for your CDU overhead line? Many facilities are still using conventional slotted angle quills for this application. As known, these can present several limitations, including: -...
  16. rscosta1976

    ASTM method for hydrotreater feed chloride measurement

    Good afternoon, Can someone indicate if any of the methods below are suitable to determine the chloride content (inorganic and organic) in for a typical Diesel hydrotreater feed stream? I checked online below methods, but would appreciate any thoughts on this regard. Several seem to be...
  17. rscosta1976

    Produced water oxygen ingress

    Thank you both for the valuable feedback. It is truly useful. Now let me answer one of the questions and tell you the rest of the story. I do not know the O2 level as the plant is still being designed. However, there is no O2 scavenger being injected nor any deaeration being performed, so we...
  18. rscosta1976

    Leaving The Girth Weld Uncoated in Sour Gas Pipeline

    I agree with the need to make a detailed assessment. I see no issues in using FBE coating for the pipeline inner surface (coupled with a well designed and operated chemical injection system). But, in my view, the girth welds should be coated as well, especially for pipelines with several...
  19. rscosta1976

    Leaving The Girth Weld Uncoated in Sour Gas Pipeline

    I don't believe the suggestion of having uncoated girth welds is acceptable for the conditions you are describing. A CO2 partial pressure above 30 PSIG is usually considered quite corrosive, especially in your case (with a pH of 4). As stated above by several professionals, this is a risky...
  20. rscosta1976

    Produced water oxygen ingress

    Gentlemen, I'm involved on a discussion regarding material selection for a gas well produced water system. Some colleagues are defending the idea that the produced water system should be considered oxygen free. I'm not sure I agree with that. Water characteristics: H2S = 1,400ppm CO2 = 5ppm...

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