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  1. Morts81

    Part UHX Tube-sheet Stress During Hydrotest

    We are currently fabricating replacement u-tube bundles. The bundles are Figure UHX-12.1 Configuration D with extended flange, the gaskets either side of the tubesheet are the same configuration and as such no bolt load gets transferred into the tubesheet during normal operation. The intent...
  2. Morts81

    Flanged Joint - Low Specified Assembly Stud Load Issues

    ASME PCC-1 Appendix O gives a joint component approach to assessing the assembly stud stress for a flanged joint. It states the minimum permissible bolt stress must be selected by the user and then goes on to say its typically in the range of 20-40% of ambient bolt yield stress. My employer has...
  3. Morts81

    ASME PCC-1 Appendix O - Blind Flange

    ASME PCC-1 Appendix O provides guidance for the determination of an appropriate assembly bolt stress for flanged joints. However, it doesn't explicitly cover blind flanges. For weld neck flanges bolted to a blind flange (including heat exchanger cover flanges), a basic summary of how I've been...
  4. Morts81

    ASME VIII-1 (UG-11/UG-44) Mandatory Standard Flange Gasket Dimensions

    Firstly, I understand there has been a number of queries submitted previously on similar topics, however, I couldn't find the ultimate answer I was looking for plus I also wanted to add some further code clauses, etc to the question to ensure no ambiguity. ASME VIII-1 (Clauses UG-11 & UG-44)...
  5. Morts81

    ASTM A333 Heavy Wall Pipe Limitations

    The scope of ASTM A333/A333M specifically states "Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse effect on impact properties." We currently have an issue where we have identified longitudinal cracks in DN300 47mm thick A333 Gr6...
  6. Morts81

    Tapped Hole for Lifting Eyebolt - Edge Distance

    Similar questions seem to have been asked in the past but nothing I can find for lifting activities. We are looking at possibly tapping the outer diameter of some large blind flanges to attach a lifting eyebolt. I'm trying to understand if there is a minimum edge distance between the tapped...
  7. Morts81

    Shell & Tube Heat Exchanger Baffle Seals

    Gday Forum Members My question is a simple one today (or so I hope). I'm familiar with longitudinal baffle seals (ie, kempchen, etc) for Shell and Tube Heat Exchangers, however, I'm not familiar with any transverse baffle sealing systems. We need something for a couple of baffles and they need...
  8. Morts81

    Demister Pad for Shell and Tube Heat Exchanger

    Gday Forum Members We have a current issue where we are having to replace existing undersized TEMA AES S&T Coolers (air compressor inter-stage coolers). The existing have a demister pad installed in the DN400 outlet nozzle and we intended to keep this configuration, however, during the design...
  9. Morts81

    ASME VIII-1 2015 UG-140(b) Over-Pressure Protection by Combination of System Design and PSV

    Gday Forum Members My question relates to ASME VIII-1 2015 UG-140(b), specifically the interpretation of UG-140(b)(2) which reads: (2) The decision to limit the overpressure by system design is the responsibility of the user. The user shall request that the Manufacturer’s data report state...
  10. Morts81

    Re-Rating ASME VIII Vessel - R Stamp Nameplate & U Stamp Nameplate Requirements

    Forum Members My question relates to the final affixing of NBIC R-Stamp nameplates after re-rating an item of equipment. We have a vessel which we may require to re-rate from 170degC to 180degC, this will reduce the MAWP from 890kPa to something closer to 850kPa. The expectation is that we...
  11. Morts81

    ASME VIII Division 2 - Fatigue Analysis Article 5.5.2.3

    Forum Members With regards to ASME VIII Division 2 Article 5.5.2.3 Step 4 (a) & (b). This relates to thermal cycles in vessels and determining whether a fatigue analysis is required. (For the purpose of this question, I'm ignoring pressure cycles) I'm trying to understand whether this...
  12. Morts81

    Support Lugs Without Rings - Gusset Allowable Compressive Stress

    Hey Guys Working through the analysis in Pressure Vessel Design Handbook (Second Edition) by Henry Bednar Section 5.2 Support Lugs Without Stiffening Rings and at the top of page 157 there is an equation for allowable compressive stress of the vertical gussets, this equation is: Sa = 18000/(1...

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