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  1. ellas1

    How can I calculate the temperature at the end of a Pipe Trunnion

    The Trunnion is very long. If I use the same temperature as the process pipe we will have expansion problems plus we have to be concerned for the building steel. Thank you anyway!
  2. ellas1

    How can I calculate the temperature at the end of a Pipe Trunnion

    How can I calculate the temperature at a point of a Pipe Trunnion. The Pipe Trunnion is welded to a hot (steam) pipe. Thank you
  3. ellas1

    Cold & Hot Allowable Stress for A778 304L pipe

    I am not looking for B31 code. I am looking for the allowable stress for this material because it is not listed on B31. Th elates t I have is 2018. Thank you
  4. ellas1

    Cold & Hot Allowable Stress for A778 304L pipe

    What is the Cold & Hot Allowable Stress for A778 304L pipe. I cannot find this material on B31 tables. Thank you
  5. ellas1

    Unbraced Length

    I have an Unbraced WF beam Pinned at both ends and a post at mid-span which places segments of both the top & bottom flanges under compression. Is it accurate to use the location of the infections points as the unbraced length (where the moment switches from + to -) or the total length of the...
  6. ellas1

    Seismic Coefficient Rp for piping and its supports

    For ASME piping with joints made by welding or brazing Table 13.6.1 of ASCE 7-10 (Seismic Coefficient for Mechanical & Electrical Components) shows an Rp=12. However, section 13.4.1 of ASCE 7-10 Design Force in the Attachment) indicates that Rp shall not be larger than 6. Is the code expecting...
  7. ellas1

    Capacity of a CECO 12H3 Steel Joist

    thread507-270275 I need the load carrying capacity of an old CECO 12H3 steel joist at 17 ft O.C. If anyone with an old catalog can help it will be greatly appreciated. Thank you
  8. ellas1

    Existing 1950's era building

    I am looking for a 1975 BOCA Building code. Would you like to sale yours?
  9. ellas1

    Handrail Posts

    You can probably increase the 1 1/4" pipe section modulus (S) by inserting a solid round bar for the first few inches (6-12)above the base where the moment is max.
  10. ellas1

    Nozzle Loads

    SnTMan Thank you for your reply. The allowable's given are forces (lbs) and moments (ft-lbs). The actual thermal loads are also forces (lbs) and moments (ft-lbs) from the stress analysis. Based on what we know from the MNFR's report the allowable's are based on the assumption that all three...
  11. ellas1

    Nozzle Loads

    Problem: We have a vessel nozzle that is subjected to 3 thermal forces Fx, Fy, Fz and 3 thermal moments Mx, My, Mz with Fx the axial force and Mx the torsion. Even though all forces and 2 of the moments are much smaller than the given allowable's one of the bending moments exceed the allowable...
  12. ellas1

    Allowable stress for A53 Gr B pipe above 800 F.

    The ASME B31.1 allowable for A53 GR B at 800 degrees F is 10.8 and according to para 124.11. the upper temperature limit for this material is 800 except as permitted by para 122.6.2. Assuming it is permitted by 122.6.2, how can we determine the allowable at say 1100 degrees F? Thank you
  13. ellas1

    Height of 25 psf snow?

    Agree with dccarr82775. We use 20 pcf which is slightly higher than the accumulated AASHTO.
  14. ellas1

    Roof jumping upwards with no apparent reason

    dik The only moving parts are the fans but they are isolated (resting on springs).
  15. ellas1

    Roof jumping upwards with no apparent reason

    hokie66 Your response makes sense. When I visit the site tomorrow I will check and see if this is happening when a door opens and when all the doors are open for a while. FYI - Flat roof deck, on exposed steel joists with insulation and roofing membrane. There is no ceiling. It is heated...
  16. ellas1

    Roof jumping upwards with no apparent reason

    SteelPE According to the field guys this happens all the time with or without wind. As far temperature is concerned we have a range between 45-50 F at day time and 30 to 40 F at night. The roof in insulated and the building in heated. Thank you everyone.
  17. ellas1

    Roof jumping upwards with no apparent reason

    msquoared48 But that should only happen once, when the change took place about two months ago. They claim that it is happening daily if not hourly. Even though concentrated the RTU dead load change is very small as compared to the dead weight alone? Anyway, I will report back after I visit the...
  18. ellas1

    Roof jumping upwards with no apparent reason

    We have a large flat metal deck roof on 100 ft long steel joist @ 6 ft OC. The mechanical contractor has recently replaced 3 roof top units (Air Handling Units) with 3 new and lighter ones (approx 8 kip each). After the old units were removed and the new units installed several people working on...
  19. ellas1

    Pre-Manufactured Building Evaluation

    Any tips on how to evaluate the structural integrity of an existing pre-manufactured steel building with unknown MNFR.
  20. ellas1

    Wind loads on scaffolding

    OSHA does not really go into detail on how to determine the loads. In our case we have to design the formwork for the core of relatively tall building and the wind can play tricks as we move upwards, epsecailly in an urban setting. I wonder if we can use the same wind loads that used to design...

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