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  1. Bilal7590

    UNS S17400 Material for Valve Stem

    Table A.3 "Environmental and materials limits for austenitic stainless steels used as valve stems, pins and shafts" proposes a material UNS S20910 for valve stems for any combination of temperature, partial pressure, chloride concentration and pH; but it still doesn't guarantee its resistance to...
  2. Bilal7590

    Heat Exchanger Tube Failure

    Hi All, We recently carried out Eddy Current Testing (ET) of tubes of a heat exchanger. It had 512 tubes in total. But ET revealed that 11 tubes had wall loss beyond acceptable limit. Hence these tubes were plugged. My question is that how can I find whether the heat exchanger will perform its...
  3. Bilal7590

    UNS S17400 Material for Valve Stem

    Hi all, At our process plant, H2S gas at about 17 bar pressure is in use. All the butterfly valves have UNS S17400 stems and SS-316L discs. I was studying NACE MR 0175 (2009 edition) which states in Table A.27 that "No data submitted to ascertain whether these materials are acceptable for...
  4. Bilal7590

    Allowable Displacement in Vertical Pipe

    Greetings, In AutoPIPE, one can set the gap for guide supports as explained by XL83NL. And yes it's a good suggestion by XL83NL to add guides in the 1" gaps between platform holes and pipe. I thank all of you for contributing and helping me out in this scenario. I highly appreciate the kind...
  5. Bilal7590

    Allowable Displacement in Vertical Pipe

    Greetings, Actually, other than these supports, there are 6 platforms for access to different heights of the process tower from which this line is coming out. The pipe goes through the holes made in platforms for this purpose. The diameter of holes is approximately 8 inches; which means that the...
  6. Bilal7590

    Allowable Displacement in Vertical Pipe

    BigInch, Thanks a lot for your response. The reason why I decided to go for this analysis was that this vertical section was reported (by maintenance staff) to be vibrating excessively during an earthquake few months ago. However, obviously it was not possible to quantify the vibration that was...
  7. Bilal7590

    Allowable Displacement in Vertical Pipe

    Greetings, Thanks a lot for trying to help me out. While conductiong this analysis, I have specified Bentley AutoPIPE software to analyse the system with reference to ASME B31.3 standard. As for allowable stress values, the software then calculates allowable stresses based on the mentioned...
  8. Bilal7590

    Allowable Displacement in Vertical Pipe

    Greetings, I was carrying out stress analysis of a piping network in case of an earthquake using 'Bentley AutoPIPE' software. The results showed that piping supports were not facing any significant stress, however the vertical section of pipe had a maximum displacement of about 100 mm (4...

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