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  1. 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)...
  2. 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...
  3. 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...
  4. 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: -...
  5. 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...
  6. 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...
  7. rscosta1976

    Degradation Mechanisms affecting Petrochemical and Chemical Industry

    Good morning all, We all know that many degradation mechanisms active at Petrochemical and Chemical indsutrial units are common to the Refining Industry. Still, I wonder if there are any clear literature references addressing typical degradation mechanisms and corresponding mitigation...
  8. rscosta1976

    Corrosion on Alloy 400 quill

    Good morning, Please share your experiences with Alloy 400 quill corrosion used to inject caustic upstream CDU charge heater. NACE publication 34101 (2001) refers in 10.4.3 that Alloy 400 may suffer from accelerated Sulfidation corrosion at this location. On the other hand, Nace publication...
  9. rscosta1976

    MEG Reclamation - Material Selection & Corrosion

    Good afternoon, Please share your experiences regarding MEG reclamation units corrosion, particularly in the circuits handling MEG solution saturated with salts. Only found one paper about this (NACE 07116). Licensor is specifying all these circuits (downstream of Sour gas Stripper) in carbon...
  10. rscosta1976

    Lean Amine over stripping - when is it considered too much?

    Dear all, Can you please let me know if you have a minimum limit for H2S content on the lean amine stream? During regeneration of amine, it is known that operators must ensure the lean loading is less than 0.1 mol/mol and in some case even lower (less than 0.05 to 0.07 mol/mol). Given such a...
  11. rscosta1976

    Hydrotreater sour water corrosion

    Dear all, Please share your experience regarding REAC system corrosion as function of the separator water pH. For NHT, UOP recommends to maintain a minimum of 3%vol wash water and to control the separator water pH between 5.5 and 6.5 (avoiding the 6.8 to 7.3 range). 1) What is you...
  12. rscosta1976

    Lean Amine - maximum recommended Chloride concentration to avoid ClSCC on heat exchanger tubes

    Dear all, It is known that in an aqueous environment with neutral pH, 304L tubes are susceptible to ClSCC at temperatures above 150 F, even on the presence of a few ppm of chlorides. The risk increase with temperature as expected. In amine service and considering a high pH (for the solution)...
  13. rscosta1976

    Desalter Electrostatic grid

    Dear members, I found some references in a standard were it is recommended to coat the last 25-50 mm of the tips of the grid. One internal client asked if this is typical for electrostatic grids and asked what are the exact coating requirements for the grids. Unfortunately, I have no answer...

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