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  1. johnnymist2003

    15MO3 PLATE MATERIAL

    Hi all, I am trying to find elevated yield and tensile strength properties for 15MO3 plate, for use in a PD 5500 vessel design. PD 5500 does not have stress values above 400 degC, my design temperature is 440 deg C. Thanks. John
  2. johnnymist2003

    Zinc and 300 series combination

    Hi all, I'm not a corrosion engineer, so forgive me if the terminology I use is incorrect. I have a 304 stainless steel stud bar passing through a hole in a galvanised carbon steel plate. I have been advised that to mix 304 ss and galvanised materials is not recommended as the zinc interacts...
  3. johnnymist2003

    BS 3059/5

    Hi all, I'm trying to find some mechanical and chemical properties for BS 3059/5 material (circa 1965).The material has since been replaced by an updated material specification, this much I know.The 1965 edition of BS 1515 I have does not list any modern equivalents, and the issues of BS 3059...
  4. johnnymist2003

    BS 1501-161 Gr.C

    Hi All, we are doing some retrofitting to a vessel manufactured from BS 1501-161 Gr.C material (1959). I think that this material is equivalent in terms of tensile and yield strength to BS 1501-161-430, however, I can't find any literature to confirm this. Can anyone confirm that I may use BS...
  5. johnnymist2003

    PD 5500 clause 3.6.3.3.3

    Hi all, in PD 5500, cl 3.6.3.3.3(c) is stated: "Using a suitable stress analysis technique,....due to pressure p". What is a "suitable stress analysis technique"? Also, is there any way to reinforce / calculate the junction at the small end of the cone to avoid the 3.6.3.3.3 calculation? Ta. John
  6. johnnymist2003

    PWHT BS 1501-151-28A

    Hi all, we have modifications to do on two Separator Vessels, and two Columns.The vessels and columns have been in service since 1967.They were constructed from BS 1501-151-28A material.All of them are in wet sour service.When constructed, none of them were post weld heat treated.Code data book...
  7. johnnymist2003

    PWHT BS 1501-151-28A

    Hi all, we have modifications to do on two Separator Vessels, and two Columns.The vessels and columns have been in service since 1967.They were constructed from BS 1501-151-28A material.All of them are in wet sour service.When constructed, none of them were post weld heat treated.Code data book...
  8. johnnymist2003

    PWHT of BS 1501-151-28A

    Hi all, we have modifications to do on two Separator Vessels, and two Columns.The vessels and columns have been in service since 1967.They were constructed from BS 1501-151-28A material.All of them are in wet sour service.When constructed, none of them were post weld heat treated.Code data book...
  9. johnnymist2003

    Tube-to-tubesheet joints

    Hi all, does anybody know of any specific document reference where guidance is given as to when strength welded tube-to-tubesheet joints should be considered (eg. for toxic service, etc.) I have looked in ASME VIII, Div.1, API, & ISO 16812, & I can find no specific requirements. I'd appreciate...
  10. johnnymist2003

    ASME B16.5 Flange Ratings

    Hi all, Philosophically (gees, a big word for an engineer :)speaking....... Assume I have a Group 1 (say SA-105) Cl. 150 flange, at 100 degF, operating at 285 psig (this corresponds exactly with the pressure-temperature rating in ASME B16.5). I also have an external moment and a radial force...
  11. johnnymist2003

    BS 1515

    Hi all, I need some assistance please. I am doing some mods to a BS 1515 Part 1,1965 designed vessel. I need to know the method used for nozzle reinforcement in BS 1515. PD 5500 has two methods, clause 3.5.4 and also Annex F (area reinforcement rules). If BS 1515 uses arear replacement rules...
  12. johnnymist2003

    Date of applicability of 2004 BPV Code

    As far as I am aware, the 2004 edition of the ASME BPV Codes were applicable as of 1 January 2004. A friend of mine says that he read somewhere the the 2004 edition only becomes effective from March 2004. Can anyone confirm this ? Thanks
  13. johnnymist2003

    ASME VIII, Div.1, Appendix A - Interface Pressures

    Hi all, can anybody provide information on how to analytically calculate the interface pressures Pt & Po ? Also, how ould one determine the interface pressures using testing equipment ? Thank you.
  14. johnnymist2003

    Compensation Pads on Lethal Service Vessels

    Hi all, does ASME Section VIII, Div.1 probibit the use of compensation pads for nozzle reinforcement on vessels which are considered to be in lethal / dangerous service ? If so, please direct me to the relevant paragraph. Thanks. John
  15. johnnymist2003

    ASME Section VIII, Div.1 Appendix UHX

    Hi all, in Appendix UHX, the expanded length of tube, ltx, is defined in terms of ASME tube-to-tubesheet joints. How would you specifiy ltx for a TEMA tube-to-tubesheet joint where typically two grooves are used ? Thanks. John
  16. johnnymist2003

    ASME Section VIII, Div.1 Appendix 1-4

    Hi all, for an ellipsoidal head designed to UG-32(d), Appendix 1-4 (f) must be considered when t/L<0.002. 1-4(f)(1)(h)(2) sets limits of 0.0005<=t/L<=0.002. What does one do in the case where one has a large diameter, low pressure dished end, where t/L<=0.0005? Is ASME VIII, Div.1 implying...
  17. johnnymist2003

    ASME VII Div.1 2004 Appendix 1-4

    Hi all, for an ellipsoidal head designed to UG-32(d), Appendix 1-4 (f) must be considered when t/L<0.002. 1-4(f)(1)(h)(2) sets limits of 0.0005<=t/L<=0.002. What does one do in the case where one has a large diameter, low pressure dished end, where t/L<=0.0005? Is ASME VIII, Div.1 implying...
  18. johnnymist2003

    Nozzle Connection - Section VIII, Div.1 - UW-16

    Hi all, I have a vertical reboiler with fixed tubesheets. The tubesheets are required to be fittied with vent and drain connections(NPS 1/2).The nozzles will be attached to the tubesheet rim,sticking out radially so that the vent and drain holes run between the bolt holes.The nozzles will be...
  19. johnnymist2003

    Din 28086 - Lifting Lugs - Hertz Pressure Po

    Hi all, I do not have a copy of Din 1050 (as referred to in Din 28086). Does anybody know the origin of the allowable value of 637 MPa for Hertz contact stress in DIN 28086 (refer Table 3, note 1)? How does this value relate to say material tensile or yield stress? How would one calculate this...
  20. johnnymist2003

    Conical transition design

    Hi all, I'd greatly appreciate some specific assistance here.I would request that memebers refrain from providing &quot;vague answers&quot; or opinions.I have a kettle type exchanger with two fixed tubesheets.The layout is as follows : fixed tubesheet,conical transition attached directly to...

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