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  1. chrysa1975

    ISO 12944-9 QUALIFICATION

    Hello, To certify a coating system according to ISO 12944-9 must both the minimum requirements of Table 3 and the performance testing be met, or is passing the performance tests sufficient? Thanks in advance for your help.
  2. chrysa1975

    Galvanic corrosion in dissimilar welds exposed to offshore environment

    UNS S32205 housing for bearing is welded on a S355 structure located above sea. Concern is the galvanic corrosion and how to prevent it.
  3. chrysa1975

    Galvanic corrosion in dissimilar welds exposed to offshore environment

    What precautions should be taken to avoid galvanic corrosion when welding dissimilar metals that will be exposed to an offshore environment?
  4. chrysa1975

    ASTM A333 GRADE 6 Q&T WITH HIGH YIELD AND TENSILE STRENGTH FOR SOUR SERVICE

    Really thanks weldstan, Edstainless and SJones!!!! Your help is valuable!!! FYI, I am just sharing with you that the materials have been accepted, claiming that SSCC is a reduced risk due to the hardness value in the base material which is 188 HV10 and the operating temperature which is above...
  5. chrysa1975

    ASTM A333 GRADE 6 Q&T WITH HIGH YIELD AND TENSILE STRENGTH FOR SOUR SERVICE

    Thank you both! @SJones, in ISO 15156-2 A.2.1.2 f) the heat treatment includes as a first step austenitizing. But our material is ASTM A333 6 Q&T. How do we escape this step? How can I support it to the client? Thanks in advance!
  6. chrysa1975

    ASTM A333 GRADE 6 Q&T WITH HIGH YIELD AND TENSILE STRENGTH FOR SOUR SERVICE

    Thank you both! Indeed materials shall be rejected. However, please also note the following. 1. The Ceq is 0.42 and the maximum hardness stated in the MTC is 188HV10. The tempering temperature is 630degC+10. I still cannot understand the high YS and TS values. 2. Quench and tempering is not a...
  7. chrysa1975

    ASTM A333 GRADE 6 Q&T WITH HIGH YIELD AND TENSILE STRENGTH FOR SOUR SERVICE

    We have procured ASTM A333 GRADE 6 for sour service and there are two points that need clarification. 1. in the material requisition there is a requirement for yield strength and ultimate tensile strength not to exceed the specified minimum value by more than 20,000 psi. However the MTC depict...
  8. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    The owner requires HDG+A7.13 for splash/tidal zone. The engineering consultant has update to HDG+CX to reflect the latest edition of ISO. I am on the contractor's side and I try to convince both that overcoated HDG is not applicable for splash/tidal zone.
  9. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    Thank you very much GGedge! Indeed! Mr. SJones as well.
  10. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    Exactly! But I decided to repost. Manufacturer of fenders have in their standard product range painted steel structures not overcoated HDG. I need to know the performance of duplex coating system over HDG in order to face the owner. He needs a guarantee for 15 years and I cannot find an industry...
  11. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    ISO 12944-9 Table 3 does not include minimum requirements for overcoated HDG in splash/tidal zone. ISO 12944-5 mentions the possibility of premature failure of overcoated HDG in immersed conditions (splash/tidal zone is a more aggressive environment than immersion) AGA is just promoting its...
  12. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    Why didn't you assume that my focus was on overcoated HDG? Why didn't you share your knowledge for both options? This is not a forum for psychoanalysis. If you want to help, I appreciate it, if you don't want, at least don't let others understand it through pointless questions.
  13. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    Thank you SJones for your feedback and GGG for your remark. LittleWheels is asking exactly what I need. Hot dip galvanizing overcoated in splash zone. Is there a reference paper as well?
  14. chrysa1975

    Duplex Coating Systems in Splash / Tidal Zone

    Are there any references/conference papers/publications/researches/standards that study the use of duplex coating systems in splash tidal zone?
  15. chrysa1975

    Manufacturer Painting of Ball Valves

    I revert since the valve mfr has provided a technical data sheet of the paint from SORITEC SPAIN paints, type NITROTEC Nitrocellulose. Have you ever met such external painting for industry valves, meaning valves per ASME B16.34 used in plants.
  16. chrysa1975

    HDG immersed and painted

    The project is ongoing... Thank you so much for the additional reply!
  17. chrysa1975

    HDG immersed and painted

    GGedge I appreciate your reply, although it is based on a logical interpretation of what is specified in the ISO. Υou are correct that the phrase "cannot be used" is wrong. However I dont think it is an absence from minimum requirements. ISO does not bless it, implying also that dedicated tests...
  18. chrysa1975

    HDG immersed and painted

    Noone? Mr SJones?
  19. chrysa1975

    HDG immersed and painted

    Dear all, there is a contract requirement for the supports of marine fenders, to be hot dip galvanized and overcoated per ISO 12944-9. I have an objection and I need your help. These items being hot dip galvanized, they cannot be used in splash / tidal and immersed services as it is clearly...
  20. chrysa1975

    Manufacturer Painting of Ball Valves

    Please, could someone tell me what would be a paint product "chromium phosphate / nitrosynthetic"? Could this product be used for the corrosion protection of ball valves?

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