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  1. Biss73

    Factor F in nozzle reinforcement calculation

    Hi, Does anybody know the reason why a Factor F less than one cannot be used on openings that are not integrally reinforced? Is it to prevent creative repads that are not all-around or uneven? Regards, Serge
  2. Biss73

    Bend vs rolled cone in fatigue

    Hi, I have a cone in my div 1 pressure vessel and I was asked if it was possible to have the cone made by bending instead of rolling. Since this vessel will have many cycles (±400,000), I have doubts that it would be advantageous since each bend should be considered as peaking and they would...
  3. Biss73

    Environmental modification factor fe in fatigue analysis

    Hi, I am doing a fatigue analysis and I was having questions regarding the environmental modification factor fe (as per ASME Section VIII, div 2, art 3.F.2.2.c). Note that this vessel is div 1, so I don’t have a user's design specification from the client specifying this factor. The code says...
  4. Biss73

    Inconel 625 weld overlay Fe content

    Hi, We want to buy a new vessel with inconel 625 weld overlay. The client specification says that the production weld chemistry of Ni alloy such as 625 corrosion resistant weld overlay on the carbon steel base material shall be equal to or better than their respective Ni alloy pipe/plate...
  5. Biss73

    Helical strakes on stack

    Thanks rb1957, but could you tell me what are you basing this on? Serge
  6. Biss73

    Helical strakes on stack

    Thanks, I understand that you only put helical strakes on the section above the roof, but does the fact that the lower part of the stack is protected from the wind enables you to have shorter strakes? Or does the fact that the stack is not guided at the junction with the roof does not influence...
  7. Biss73

    Helical strakes on stack

    Hi, We are designing a stack which the bottom half is in a building while the rest is exposed to the wind. According to ASME STS-1, we need to install helical strakes which are supposed to cover 1/3 of the stack. Does anybody know if it needs to cover 1/3 of the part exposed to the wind or 1/3...
  8. Biss73

    Energy transfered on impact by a crumbling object

    Hi, Here are some answers to your questions: __ dvd: Also, how tall is the stack? diameter of 4' by 200ft height How tall will the sections of stack be cut? Sections of 50, 60 and 90' I assume that the stack cannot be tilted over and lowered to the ground like it may have been erected? Yep...
  9. Biss73

    Energy transfered on impact by a crumbling object

    Thank you all for your input. Do not worry the area will be secured during the demolition. It is the other equipments surrounding the stack we want to protect. Biss
  10. Biss73

    Energy transfered on impact by a crumbling object

    Hi, I'm working on the demolition of a stack and we plan on cutting the stack in sections and removing those one at a time with a crane. The problem I have is that inside this stack there is refractory material and we need to block the bottom of the section with a plate to avoid having chunk of...
  11. Biss73

    Firebox quality steel

    SA-201 Gr B FBQ was replaced by SA-515 Gr 60 in 1967. Does someone know if they have the same Fig UCS-66 B curve? Thanks again, Biss
  12. Biss73

    Firebox quality steel

    So having a firebox quality steel does not necessarely translate into a lower mdmt? Thanks, Biss
  13. Biss73

    Firebox quality steel

    Hi, I'm working on an 1948 heat exchanger which has a shell in SA-201 Gr B FBQ. Does an FBQ grade steel respects by default ASTM A300? If yes, is the -50F minimum temperature requirement (seen in some threads) valid for all steel under A300? If no, does anyone know what is the minimum...

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