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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...

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...

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.

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.

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

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...

Is this a ground flare?

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

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

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

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...

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...

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...

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...

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...

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.

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...

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...

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.

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...