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  1. MechEngJM

    Use of 6Mo Gaskets in lieu of Alloy 625 Gaskets

    Yes, conditions satisfy Table A.8.
  2. MechEngJM

    Use of 6Mo Gaskets in lieu of Alloy 625 Gaskets

    Apologises, perhaps I should have been more clear: service is hydrocarbon liquids from open hazardous drains.
  3. MechEngJM

    Use of 6Mo Gaskets in lieu of Alloy 625 Gaskets

    Thank you both for your replies. Relative strength and corrosion resistance of 625 versus 6Mo were less of a concern given the service compared to whether the 1:1 direct couple of the two metals would be an issue. I also appreciate your comment re. letting schedule drive bad engineering -- I...
  4. MechEngJM

    Use of 6Mo Gaskets in lieu of Alloy 625 Gaskets

    Hello, Looking for some insight into the following case... Open Hazardous drains line has the following spec: - Pipe: Alloy 625 (Ni Alloy, BE, ASTM B444 UNS N06625 Gr. 1, Seamless, ASME B36.19) - Flange: Alloy 625 (Blind Flange, Ni Alloy, 150lb RF, ASME B16.5, ASTM B564 UNS N06625) - Gaskets...
  5. MechEngJM

    316 Blind Flange on a Super Duplex Line

    Thanks all - replies appreciated.
  6. MechEngJM

    316 Blind Flange on a Super Duplex Line

    Thanks for the feedback. Perhaps 'quantitative' is too strong a word. What I was looking for was something like a galvanic series with a given p.d. range relative to SCE for both SDSS and 316SS, allowing me to state something like 'p.d. < ~0.15v hence risk of corrosion low'... if that happened...
  7. MechEngJM

    316 Blind Flange on a Super Duplex Line

    The fluid is produced water from a sour reservoir that has been through the standard water plant of multistage separation, hydrocyolones and skimmers and is now in-spec for overboarding. So yes -- high Cl content. A full diameter gasket may be an option, but currently I'm looking to establish...
  8. MechEngJM

    316 Blind Flange on a Super Duplex Line

    Hi All, I have a 1" super duplex (ASTM A790) pipe that has had a 316 blind flange (150lb) installed. Piping spec calls for A182 Gr F55 to ASME B16.5, but for various reasons, this temporary solution was used. There has now been a request to extend this temporary solution to circa 1 year (mod...

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