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  • Users: ibrahimdemir
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  1. ibrahimdemir

    Allowable contact stress vs hardness for steels

    Hi everyone, Sometime ago, I saw a table that shows the material properties and hardness of the several type steel ( structural carbon steel, quenched and tempered steels etc... ) on the net. It was tabulating the yield stresses, tensile stresses, hardnesses and the allowable contact ( Hertzian...
  2. ibrahimdemir

    How to Calculate Natural Frequenecy of Steel Structure

    Roger, A structure should be stable for static analysis before going for dynamic analysis. I believe, the vessel and/or content of it have very high masses. As far as I can see from the diagrams, the structural system does not have lateral brace to stabilise the system under horizontal wind or...
  3. ibrahimdemir

    Flange Spreadsheet - updated

    Mogens, I did not go through all the details. However, the external load directions are not clear either on the spreadsheet or on the flange drawings. Giving orientation of x, y and z or definition of the moments ( line bending , torsion etc.. )could be sufficient. We may still find what they...
  4. ibrahimdemir

    Monorail Beam Flange Reinforcement

    dbuzz and prex, Thanks for you input to this discussion. Now, we all agree on the type of the reinforcement and its contribution to the flange stiffness due to localised wheel loads. The BHP method has two bars continuously welded on both side, and bars are right under the whell centrelines...
  5. ibrahimdemir

    Chrome Carbides in Stainless Steel

    TiffanyThorbahn, This has been discussed on the following thread. thread725-76274 Ibrahim demir
  6. ibrahimdemir

    Monorail Beam Flange Reinforcement

    dbuzz, Thanks for the details. I accept your concern about the beam with curvature. I do calculate the combined action on the curved beam and on the bottom flange. This is not my concern. I understand that you know about the BHP guideline about stiffening. If you follow the examples in that...
  7. ibrahimdemir

    Monorail Beam Flange Reinforcement

    dbuzz, Thanks for your reference. However, that is not the one I can use for the calculation for the resistance cantribution of the doubler plate to local bending. Thanks Ibrahim Demir idemir@cbh.net.au
  8. ibrahimdemir

    Monorail Beam Flange Reinforcement

    edba and 49merc, Thanks for your response. However, the loads are very high and we need to keep the bend radius as I explained earlier. The only option we have is to reinforce the bottom flange by a method that I was explaining earlier. Our target is to use a single flat bar ( doubler plate )...
  9. ibrahimdemir

    Monorail Beam Flange Reinforcement

    dbuzz, Thanks for your response. However, I disagree with your statement on the zero contribution of the doubler plate under the flange for the trolley wheel load. Basically the resistance comes from the flextural stiffness in the longitudinal direction not in the transverse direction of the...
  10. ibrahimdemir

    Monorail Beam Flange Reinforcement

    Thanks for your replies. Unfortunately, we are not able to replace the section size. The cross section (U beam)is the most suitable section for bending to a small radius in the weak axis direction. I tried to use Universal column sections which does not require the stiffening. However, the...
  11. ibrahimdemir

    Monorail Beam Flange Reinforcement

    Dear all, In case the secondary stresses due to trolley and the load on it is high and trolley flange needs reinforcement do you use a flat bar underside of the flange to increase the stiffness? Is there a supporting document to see what has been considered for the reinforcement calculation...
  12. ibrahimdemir

    stainless steel welded part getting rust after dishwasher test.

    gmensing, I suggest you to check your manufacturing and/or welding procedure as well. If you work with austenitic steels you need to know about formation of Chromium Carbide. Solution treatment between 1050 and 1150 deg C will take all of carbon into solution and rapid cooling from this...
  13. ibrahimdemir

    Center of Gravity

    Lippie, Sometimes, you may simulate forces by using lumped masses at their effective locations in the model. So, all the masses will be in the model and there will not be a problem getting COG through the analysis software. If you modelled some masses as forces introduced onto the structural...
  14. ibrahimdemir

    Deaerator Bursting Disc Noise Problems

    Hi Everyone, I guess a silencer installation in accordance to ASME B31.1 Open System may solve the problem. Instead of safety valve you will have a rupture disc and a short pipe for the open system connection. This pipe will be inserted into the discharge pipe and silencer connected to this...
  15. ibrahimdemir

    Determination of shaft torsion in case of butterfly valves

    Hi there, In case of large size ( 1 metre of diameter and above ) of butterfly valves, how do you determine the torsion on the shaft? Do you have a chart, formula or test results to determine moment on the shaft under different attack angle of the valve disk? I am looking for this information...
  16. ibrahimdemir

    Shaft Design

    Hi Cranekiran and others, In case of large size of butterfly valves, how do you determine the torsion on the shaft? Do you have a chart, formula or test results to determine moment on the shaft under different attack angle of the valve disk? I am looking for this information for the buterflt...
  17. ibrahimdemir

    TRD301-Annex1-English Version-3.1.Ideal-Elastic mechanical hole-edge

    Davefitz, Thank you. It is a great tip. Ibrahim Demir Design Engineer Clyde Babcocok Hitachi ( Australia )
  18. ibrahimdemir

    TRD301-Annex1-English Version-3.1.Ideal-Elastic mechanical hole-edge

    Hi, The translation to english version of the clause 3.1.1 subclause(1)of TRD301 Annex1 - April 1975 about alpham, alpham0 and relationship with residual gap, diameter ratio, nozzle internal diameter and the minimum yield strength at room temperature is a bit confusing. Comparing with the...
  19. ibrahimdemir

    saddle for a vessel

    Hi Johnp, I am very interested in seeing the papers that you listed. I was wondering if you can e-mail me those to the following address: idemir@cbh.net.au Thanks in advance. Ibrahim Demir Clyde Babcock Hitachi ( Australia )
  20. ibrahimdemir

    Piping pressure thrust, PipePlus

    rch11, Your answer is in the fundamental. If there is an opening in the axial direction of the pipe that pressure forces can not be equalised by the pipe itself or vessel(s) or any other equipment, you need to take the pressure trust load into consideration. If you have a continuous piping...

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