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  1. butelja

    Tank Internal Supports

    Tankman650, Thanks for the advice. This particular tank is relatively small (23 ft diameter) and sits on a concrete foundation, to I don't think punching loads are an issue. Also, the original bottom corroded and was replaced with 1/2" bottom plate. I think I'll still use repads to...
  2. butelja

    Tank Internal Supports

    I am designing internal supports for a large bayonet heater that will be installed in an API 650 oil storage tank. Due to thermal expansion, the heater will have to slide over the supports. It is desired to NOT have cross bracing between the internal supports to resist the lateral loading...
  3. butelja

    Steel fracture in bending

    For a look at commercially available systems that have an even higher requirement than yours, check out: www.deltascientific.com I have no affiliation with them, but found them by doing a google web search for pop up crash barriers.
  4. butelja

    Torsion in Wide Flange Beams

    The number 1 rule of torsion: Use closed sections. A round, square, or rectangular section can carry the torsion with a MUCH lower weight of material.
  5. butelja

    WRC-406, where to find?

    All of the WRC bulletins can be obtained at: http://www.forengineers.org/wrc/index.htm
  6. butelja

    Gravel Force

    I don't have a copy available to check, but does API Recommended Practice 521 – Guide for Pressure- Relieving and Depressuring Systems have any guidance in this area? If not, then I assume that ANSI/ASME B31.3 would govern the underground piping design. If you have access to Caesar II piping...
  7. butelja

    Gravel Force

    Is this a ground flare?
  8. butelja

    Shear Deformation!!

    Shear deformation is usually only a problem in short span/depth ratio beams. In equipment frame design for large presses, it is very important.
  9. butelja

    Inclined Beam Connections onto flat surfaces

    Won't normal shimming and grouting take care of this?
  10. butelja

    Vortex shedding

    3 WORDS: Tacoma Narrows Bridge. See http://www.eng.vt.edu/fluids/msc/gallery/vortex/tac.htm
  11. butelja

    Hot RC Structure (Sulfur Pit)

    We are evaluating a design for a sulfur pit. It is essentially a RC box below grade, with removable RC lid panels. The interior is lined with 1/4" thick 316 stainless steel. The sulfur storage temperature is 300 °F. Does anyone know of a good reference that deals with evaluating the...
  12. butelja

    Design & Manufacture of concrete slab

    Suggestion from another non-structural/non-civil type: How about drilling 5/8" diameter through holes in the 72"x8" perimeter steel? Cut the rebars long enough to have about 1/2" protrude through the holes. Fillet weld the rebars to the frame on the outside. For pouring...
  13. butelja

    Bolt Failure Problems

    Try the corrosion engineering forum. You may be experiencing liquid metal embrittlement. Have you tried tack welding the nuts on low strength (A307) fasteners instead of using hight strength fasteners? If the problem is corrosion related, then higher strength bolts will in general have more...
  14. butelja

    Hydrostatic Pressure on a curved surface

    I think that tall (i.e. - grain elevators, 100+ ft tall) cylindrical concrete structures are often formed by slip forming. In this method, the forms are slowly (a few feet per day) jacked up as the additional concrete and steel is added. The idea is that the forms are only on the order of ~10...
  15. butelja

    Wedding Cake Topper Design

    Congratulations! How about placing long spikes (pilings?) on the base of the topper. They can pierce through the cake entirely and rest on the support plate that is holding the top layer of the cake. The cake will only provide lateral support. Due to the unbraced mutistory structure, the...
  16. butelja

    Effects of local (point) load on large tube

    Wow! The site Ron mentioned has excellent information. A paper that seems to be exactly what you are looking for is at http://ssml.naoe.pusan.ac.kr/publication/1990/1989-3.pdf. I hope this helps.
  17. butelja

    Effects of local (point) load on large tube

    The local stresses around the point load can be calculated using WRC 107 / WRC 297. WRC is the Welding Research Council, and the papers can be ordered at http://www.forengineers.org/wrc/index.htm. However, these methods, while giving local stresses, will not give you deflection or buckling...
  18. butelja

    Catenary Like Curve - Conveyor Application

    Evelrod, Presently a fixed tail pulley and catenary sag on the back side to keep tension. Re-design will utilize a gravity take-up to better compensate for thermal expansion. Edge rollers were tried initially, but due to the width (5 ft) of the belt, it still pulled up in the center. The...
  19. butelja

    Catenary Like Curve - Conveyor Application

    One thing not mentioned in my original post. The conveyor belt does not run on a bed of rollers. The bed is continuous UHMW polyethylene wear strips.
  20. butelja

    Catenary Like Curve - Conveyor Application

    Here is the problem. I've posted it to this forum because of the similarity to cable structures. I have a gravity belt thickener (belt conveyor used to dewater sludge) that has the first portion of belt horizontal. The second section is inclined at roughly 30 degrees above horzontal. It is...

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