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  • Users: dbday
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  1. dbday

    Nozzle bore machining

    r6155, would you recommend redoing the radiography after doing this ?
  2. dbday

    Nozzle bore machining

    Hi, I have a flanged (weld neck) 4"NB nozzle (set on) in XS pipe on the side of a small pressure vessel. My customer wants to insert a measurement device in through the flange/nozzle into the vessel, but the outside diameter of the instrument is 100mm, which is bigger by about 3mm than the bore...
  3. dbday

    Weld procedures qualifying different P numbers

    Hi, I have an 2205 duplex welding procedure that allows me to do butt welds under ASME code. Can I use this welding procedure to do the same welds in 316 stainless steel, or do I need to do a 316 specific procedure ? The duplex procedure certificate seems to suggest that the 316 P numbers are...
  4. dbday

    NDE on nozzles

    weldstan - that's what our local NDT company says, but I am no radiography expert
  5. dbday

    NDE on nozzles

    I am laying out a piece of 304 stainless steel equipment with a set through nozzle on an end cap. My client wants 100% radiography but I am unsure if/how radiography would be done on a set through nozzle in an end cap - its a 4"NB nozzle in a 10"NB end cap, all standard weight thickness. RT on...
  6. dbday

    Attachment welds over circumferential seams

    EdStainless The pad is to be the same material as the shell - client requirement
  7. dbday

    Attachment welds over circumferential seams

    Hi, I have an ASME VIII Div 1 vessel where I need to place a pad for a support over a circumferential head to shell weld. I understand that it is acceptable, with suitable radiography, to put openings across welded seams, and by inference, a reinforcing pad for said opening which would of...
  8. dbday

    Nozzle reinforcement

    mk3223 - So if, for example, I have a nozzle with a 6" i.d. but only a 1" hole in the shell then do I design as though there is a 6" hole in the shell ? r6155 - Taking my example above of a nozzle with a 6" i.d. - if the hole in the shell was 6" and it worked out that that this needed a...
  9. dbday

    Nozzle reinforcement

    Hi, If I have a set-on nozzle on the side of a cylindrical vessel where the hole in the vessel is smaller than the internal diameter of the set-on nozzle, do I use the actual hole diameter for the reinforcement calculations or do I stick with the internal diameter of the nozzle that is set on...
  10. dbday

    Weld procedures

    Hi, To qualify a welder to weld a set through nozzle on an ASME VIII vessel can I rely on a butt weld procedure that covers the thickness of the vessel, or I need to do a nozzle/plate procedure ? The nozzle is 2"NB XXS and the vessel is 10"NB XXS in 316 stainless. I am just trying to set...
  11. dbday

    A516-70N or not

    So if I have a vessel which is made of materials where I have the usual mix of nozzle and flange materials, say A105 and A106B, where some some do, and some don't, have an 'N' on the certificate, it would seem to make sense (to me at least) to do a normalising heat treatment as the last...
  12. dbday

    A516-70N or not

    Hi, Where a client wants a vessel made from A516-70N can you achieve that by heat treatment, or do you have to ensure that the steel has the N on the origianl mill certificate ? I understand what Normalising is, what it does etc etc - this is really a question about certification.
  13. dbday

    PED - classification problem

    Hi XL, The internals are welded in position, so detachment should not be a problem. Thank you for the help.
  14. dbday

    PED - classification problem

    Hi XL, See attached sketch. The unit is cylindrical in shape. It has pipe caps for ends (not flat as drawn) with couplings to connect. The internals rings are solid. The dashed line represents a perforated cylinder. I hope it is clear...
  15. dbday

    PED - classification problem

    Hi XL, Gee, that sounds complicated, but helpful to my situation. My actual bar volume value for my empty vessel comes out at 51. Considering air and designing as a pressure vessel, it seems to me that this is just above the boundary PSV=50 where moves from SEP to Cat 1. Group 2 gases for...
  16. dbday

    PED - classification problem

    Hi, Further to this PED classification problem. Can I modify the question slightly. If I have a bare vessel with nothing inside, and say an internal volume of 50 litres. I can obviously work out the classification for the pressure using the Pressure multiplied by Volume rule etc. However...
  17. dbday

    NDT of attachmentwelds

    Hi, I have some piping thast is being desinged and built to ASME B31.3. The designer has got me doing penetrant dye inspection of all the attachment welds, so support brackets, welded pads etc. This seems excessive to me, Can anyone point me at the justification for this as I can't find the...
  18. dbday

    steam quantity from a tank

    MFJewell - Unfortunately I don't know the rating of the room. The customer has brought this up after the event as we supplied a vessel with their specified size of PRV on the vessel, now they are asking us to help them justify what they asked us to do ! The "room" is a pump house of steel...
  19. dbday

    steam quantity from a tank

    Hi, If I have a simple vessel with water in it, say 1000mm dia by 2000mm o/heads. Under any and all operating or fault conditions that we can identify the PRV, if set at the MAWP pressure for the tank, would never operate. However, if there is a fire the water will get heated and could turn to...
  20. dbday

    FEA Analysis

    EdStainless - the 25% to 30% deformation is exactly what we saw on the FEA.... nice when the dots join up !

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