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  1. SJones

    Practical Implications of Impact Testing

    Try a Google search on “Review of the effects of steel composition and heat treatment on Charpy energy toughness”, or try a variant prompt in your bot of choice. It’s not really a question of ‘expectation’ rather one of ‘verification’
  2. SJones

    Welding of duplex SS pipe 30 "

    https://www.imoa.info/download_files/stainless-steel/Duplex_Stainless_Steel_3rd_Edition.pdf
  3. SJones

    Tangential Radiography of 16" pipe

    @DekDee - the technique under discussion is tangential. The 115 mm comes from the formula in ISO 20769-1, i.e along the pipe wall, as opposed to straight through.
  4. SJones

    Tangential Radiography of 16" pipe

    The penetrated thickness is around 115 mm. For Se75, ISO 20769-1 recommends a maximum penetrated thickness of 55 mm for a basic technique, and 40 mm for an enhanced technique. Digital techniques may extend the recommended penetrated thickness. As to whether such techniques could give the...
  5. SJones

    Bored, cased pipe cathodic protection

    Some recent thinking
  6. SJones

    Chloride criteria in MR0175/ISO 15156-3 for austenitic stainless steels

    @wk Taylor - things have moved on a little in the 29 years since that book.
  7. SJones

    Wer H2S at elevated temperatures debate

    Their rules. Their problem if it doesn't work out. I'm not really a downstream afficionado, but I would get Technical Safety involved as to their view on relying upon an operating procedure to create inherently safe conditions versus picking a material with resistance to the failure mode.
  8. SJones

    Wer H2S at elevated temperatures debate

    Is it not recommended to work on the max operating conditions. Until the process safety system settings are finalised, the max operating conditions will be guesswork too. It will also depend on the risk tolerance of the assessment in terms of the expectation of how rapidly the damage mechanism...
  9. SJones

    ISO 22504 Pig Trap Design

  10. SJones

    ISO 22504 Pig Trap Design

    I’ve only seen the online browser snippet, but there seem to be two errors in the definitions (probably typos)
  11. SJones

    ISO 22504 Pig Trap Design

    https://www.iso.org/standard/81761.html Will be interesting to see which operator bagged the most content.
  12. SJones

    Chloride criteria in MR0175/ISO 15156-3 for austenitic stainless steels

    NACE/ISO is for types of stress cracking only - it does not deal with pitting or crevice corrosion. I have seen equipment that has been in non-sour service with 100+k ppm of chloride having no untoward effects, and I’ve seen equipment with very much less chloride having major issues. It’s the...
  13. SJones

    Wer H2S at elevated temperatures debate

    You are attempting to perform a corrosion risk assessment based on simulations and assumptions (most likely of normal operating conditions). What is your precise issue: keeping the cost down by not specifying sour service? Look at all possible process scenarios, the possible progression speed...
  14. SJones

    What is meaning of TS B7

    https://www.globalfastener.com/data/symbol.php
  15. SJones

    CVN test at Weld Metal with ER70S-6

    The consumable batch certificate is 3.1 or 2.2 ?
  16. SJones

    Cladded Induction Bend

    Assuming weld overlay cladding, a stress relief heat treatment BEFORE bending could be helpful.
  17. SJones

    Cladded Induction Bend

    What specification are they working to, ISO 24139-1 ? The service you are supplying is just the heat treatment? The PBHT should be part of the manufacturing procedure qualification, so someone should be cutting up a test bend to ascertain the properties. At the very least, the CRA will need...
  18. SJones

    Difference Between Cladding & Overlay

    If we were informed of the articles that the OP has under consideration then we might have a more meaningful discussion.
  19. SJones

    Soft Seats in Acid Gas service

    Request the ISO 23936-1 Level 2 test data, and the ISO 23936-2 ageing and RGD qualification test data to support the proposals.
  20. SJones

    NACE Requirements for completely Cladded pressure vessel in severe sour stream

    Avoid indicating "NACE requirements" as that will be instant $$$ on the price even though, in practice, "NACE requirements" will simply be composition, heat treatment condition, and hardness control. Best to just specify those individually rather than use a blanket term. It will be pretty much...

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