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  1. Mrinet

    Super Duplex (25Cr) Girth welds Charpy Test Temperature

    brimstoner, metengr, Thanks for your response. Pipe is 30km...it is long (looking at 12m lengths) hence GTAW is not an option. The code of construction for Materials and Welding is DNV OS F101, which calls for Impact test at T-20 degrees C. (T is min. design temp). Design temp is -51 degrees...
  2. Mrinet

    Super Duplex (25Cr) Girth welds Charpy Test Temperature

    Hello, Is Super duplex (S32760) girth welds be tested at -71 degrees C. The base material was tested at -71 degrees C (as per DNV OS F101) where the MDT is -51 degrees C. This is a line pipe. I know with Solution annealing (base material) can be successfully tested at -71 degrees C. Can this...
  3. Mrinet

    pH Limits for C95800 Alloy

    Thanks everyone, appreciate it.
  4. Mrinet

    pH Limits for C95800 Alloy

    Is there a pH limit for alloy C95800 in seawater. Any references would be helpful.
  5. Mrinet

    Open Circuit potential for metals

    Thanks for all the responses. TVP:- Temperature is not above ambient.. we operate in NS (Danish) so below 18C. Plymouth Tube/TVP:- I observed some crevice but also hypochlorite being circulated in regular basis. Mrinet
  6. Mrinet

    Open Circuit potential for metals

    Thanks for repsonses. We noticed severe corrosion (within one year) to the duplex pump which was galvanically coupled with 254SMO, medium was sea water. Since these high performance SS have very close potential difference, corrosion rate must be longer...Any idea? Steve, In sea water.
  7. Mrinet

    Open Circuit potential for metals

    Anyone know where I could get open circuit potential values for materials like 254SMO, SAF2507, SAF2205, coated Carbon steel agaist Calomel or AG/Agcl electrodes?
  8. Mrinet

    Material Comparisons

    EN 10225 S355G1+N has an Impact requirement at -20C of 50J and is a steel grade used as fixed offshore structures. You could try S355G1+M which is thermo-mechanically controlled rolled steel which has simililar properties. Most of the manuractureres can produce S355G1+M type. Where do you buy...
  9. Mrinet

    Material for Sweet and Sour Gas

    Hi, Selecting a material for sweet and sour service (H2S 4% and CO2 4% ) gas transportation pipeline with a 112 bar pressure and 110 C temperature. Prior experience and help is appreicated.
  10. Mrinet

    Titanium Grade 12

    Thanks Metengr. It was helpful.
  11. Mrinet

    Titanium Grade 12

    Hi Is Titanium Grade 12 (Ti-0.3Mo-0.8Ni) be used at -40C application. The material is used as a shell for a heat exchanger. During de-compression we may experience temperatures reaching -40C Any help is appreciated. Thanks

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