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  1. PipingEquipment

    Local Hydro, Hot Tap Nozzle Questions

    Ok thank you for addressing my concerns about the hot tap (something we would sub out). So if this is industry standard then that means the metheod of hydro they propose is ok too? If so how is that ok with ASME Code, as the hydro doesn't pressure all pressure parts being modified (the nozzle...
  2. PipingEquipment

    Local Hydro, Hot Tap Nozzle Questions

    There are several vessels in service that require new nozzles. The question has been asked can we do a full pen weld through the nozzle wall and not cut into the shell until later when a hot tap will be done on them. They want to hydro the nozzles against the shell before it is cut with the...
  3. PipingEquipment

    Code Case 2695 and PE Involvement

    Thank you for your input.
  4. PipingEquipment

    Code Case 2695 and PE Involvement

    We are a div 1 shop in the USA and want to use this code case for future vessels. Since this code case allows some methods of determining thickness from div 2 does this in turn mean a PE has to sign off on those calcs (since a PE has to sign off on all div 2 calcs/vessels)? The only thing I...
  5. PipingEquipment

    Passivation and Hydrotest

    We are working on stainless vessels that are to be passivated, my question is it ok to do the passivation AFTER hydro? I thought that anything that changed the properties of the weld or material in the pressure boundary had to be done before hydro (like with PWHT), but others are saying its ok...
  6. PipingEquipment

    Pressure vessels

    http://www.eng-tips.com/viewthread.cfm?qid=27356 The above link has some great info and several equations for doing this calculation (as well as other head shapes). I usually draw a solid model and get the volume and calculate the weight from there. Or there is this spread sheet that has...
  7. PipingEquipment

    Would you consider this an ASME Code vessel?

    Thank you for all the replies, to clarify it is 9' diameter, carbon steel and large enough to be considered a Code vessel. According to the Owners Agent, the failure condition is for a dust explosion (which would produce about 150 PSI). I recommended a burst plate or other means of safely...
  8. PipingEquipment

    Would you consider this an ASME Code vessel?

    There is a customer that has a "design pressure" of 5 PSI, but then they are also asking to design for an 'extreme overpressure event' of 150 PSI in the event of a damaging event that is possible with this vessels service, they say they are adding this to the design so that the vessel would not...
  9. PipingEquipment

    Nozzle Weld Acceptable Types

    Can't trim the nozzle flush because its an internal projection. Yeah I want to do full penetration weld from outside only, design passes without repad or too much outside weld. I just didn't see a design that allows for internal projection without some weld (43) on the backside, didn't know if...
  10. PipingEquipment

    Nozzle Weld Acceptable Types

    Maybe an easier way to phrase my question; can you have a nozzle with internal projection that is full penetration and fillet on the outside, but omit the internal fillet?
  11. PipingEquipment

    Nozzle Weld Acceptable Types

    I have a hillside nozzle in a shell (nearly tangential) and we are having trouble getting to the fillet weld on the inside of the shell/pipe junction because the pipe is so close to the shell. In UW16 I didn't see any type of weld that allows an inside penetration without having to weld the...
  12. PipingEquipment

    Meshing

    I'm sorry, should have been more specific, I'm wondering about a static load case stress analysis.
  13. PipingEquipment

    Meshing

    I was wondering how to establish the correct meshing size in FEA. Where should a smaller mesh size be used and how much smaller should it be? Is it always best to use as small of a mesh as possible to get the most accurate results? Any tips or good books/articles on meshing would be...
  14. PipingEquipment

    Irregular Shaped Openings BPVC

    Yeah that class is the type of thing I want to attend, I think my company will pay for me to go the ASME course since it's online and I don't have to travel very far and its much less expensive. I think the one you listed would be better but I can't pay to attend that and, although I will try...
  15. PipingEquipment

    Irregular Shaped Openings BPVC

    Do the ASME calcs cover Pressure Thrust, I don't remember seeing anything in there about it. Is the thrust equal to a point force of the pressure times the area? About evaluating stresses, I used the Section II stress values for the stress in the analysis at the correct temperature, is there...
  16. PipingEquipment

    ASME FEA Class

    I am going to take an FEA class to get a better background and become a better software user (I am pretty much a beginner), I have a MS in Mechanical Engineering, so have a good science and math background but have no FEA specific training. I am using Inventor Professional, and would use the...
  17. PipingEquipment

    Irregular Shaped Openings BPVC

    Yeah I would really like some feedback here. I have been trying to get my company to get me into an FEA class (and it looks like they will be sending me to one next month), I have a solid science and math background, I have a BS and MS in Mechanical Engineering but didn't specifically take an...
  18. PipingEquipment

    Irregular Shaped Openings BPVC

    I decided to the evaluation with Section VIII and supplement with FEA, in both cases the design passed. SnTMan, you were correct that the radius portion didn't have much of a stress concentration and the highest stress indeed occurred because of the opening in the shell (actually the jacket...
  19. PipingEquipment

    Irregular Shaped Openings BPVC

    part 3 (uploaded pages not in order)http://files.engineering.com/getfile.aspx?folder=f2c8e3e0-accb-4b7c-906c-bd3d91c8fccb&file=SKMBT_C65413091808481.pdf
  20. PipingEquipment

    Irregular Shaped Openings BPVC

    part 2 of attachmenthttp://files.engineering.com/getfile.aspx?folder=6d4065f6-69f2-4355-aeb4-14fe21f94c7d&file=SKMBT_C65413091808490.pdf

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