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  1. dhengr

    Back to basics calculation for ASME Pressure Vessel with Flat Head

    Chrissy123: And, I’m sure that SnTMan would agree that, three winks, a nod of the head and a finger up the nose allows for at least two bad assumptions, and a satisfactory/perfect outcome.
  2. dhengr

    Difference between "Hot-Rolled Bar" and "Hot-Rolled Billet"

    PogoGo: A steel billet is a less worked precursor, with a larger cross-sectional sized than the finished rolled bar. The rolling process reduces the billet cross-sectional area, while increasing the length of the volume of steel. Finished bars of many sizes and shapes are made this way.
  3. dhengr

    What kind of foundation is this?

    Jstephen: Looks like they might have been looking for some additional anchor bolt embedment in the deeper conc. foundation for wind and EQ overturning. Although, exactly how and why is tough to tell without more info. Alternatively, the inner set of A.B’s. on their vessel chairs, and on a...
  4. dhengr

    Transportation Acceleration Loading

    Jtseng123: The two different sets of criteria, ASME and FMCSA shown above are two completely different animals. The ASME criteria are intended to indicate transport loads which might be induced on pressure vessels and the like during transit, and we should design our vessels for these possible...
  5. dhengr

    MAWP IN LEGS SUPPORTS

    AmbEng17: It would seem that you would do well to get yourself some good PV Design textbooks or a good PV Design Handbook, and study them for answers to these kinds of questions. You should also study some good books on Engineering Mechanics and Strength of Materials. You should not be...
  6. dhengr

    body flange is being counted as a line of support for external pressure

    And, why not a stiffener? The structure will act, the way you have detailed it. It knows no better and can’t read your mind as to your wishes. It is a concentrated (very localized) location where the flange is much stiffer than the surrounding shell or head, and it will influence its...
  7. dhengr

    Hi all, May I know what is the m

    Aida2011: I doubt that there is anyone cold rolling 8" thick plate for PV’s. It is a question of the size, roll diameters and the power of the rolling machine. But, irrespective of that, there is some limit to the amount of elastic stretch the outer fibers of a thick plate can tolerate without...
  8. dhengr

    how to alignment of vertical vessel

    Bhaveesh: I’ve never done this exact problem, but have done things fairly much like I imagine this would be done. Do you just have to plumb the vessel or do you have to rotate it and/or move it laterally too, to some extent? Is it on anchor bolts already, so the only thing you can really do...
  9. dhengr

    Thoughts on this type of support

    Vpbris: My first paragraph was written after viewing you first sketches, and much of it still applies to your problem. Then, I got busy with something else and never posted it. Your latest sketch probably shows things more realistically, but could still use some improvements. By all means see...
  10. dhengr

    Anchor Chair Inside Column Skirt

    Vcagrawal18: Your sketch is really ill proportioned. I don’t care that it is freehand, but it should generally be in proportion, and only you know that, at first. Otherwise, you are deceiving yourself and others, and will likely get some ill informed suggestions and answers. I did lay it out...
  11. dhengr

    Skirt to bottom head weld

    Jtseng123: I don’t know exactly what ASME has to say on the matter, but you cite some general verbiage “Although spec may say attachment shall not be welded on top of long or girth seams...,” and that seems right to me. Good welding practice and engineering judgement suggests you should not...
  12. dhengr

    Hi all while designing a tall pres

    Rajeev383: Can the inner stiffener rings corrode so you might lose shell stiffeners over time? Otherwise, as long as you design for whatever loads/stresses the multi function inner rings might see, it seems there might be some savings in not needing an out set of stiffener rings, not an...
  13. dhengr

    Transportation of 50m (160') Pressure vessel

    Moltenmetal & TGS4: Your types of loads are usually strong enough to tolerate the imposed loads of shipping by Schnabel car. They are well suited for this means of shipping, or with a little extra effort can be modified to accept the transport loads, as long as you are aware of these loads when...
  14. dhengr

    Transportation of 50m (160') Pressure vessel

    I was actually heavily involved in the designing, construction and commissioning of the railcar show in the pictures, CEBX-800. I did a preliminary design on the entire original shipping system, the railcar included, for the original purchaser of the car. That prelim. phase lasted several...
  15. dhengr

    Statuary Regulation governing the design of pressure vessel and heat exchanger

    Mech2325: Do the statues look like pressure vessels, or do the pressure vessels look like statuary? Any nudes? Is this an attempt to beautify refineries and the like? :-)
  16. dhengr

    Can we use fabricated plate flange(Top & Body flange) in U-Stamp vessel.....URGENT pls [ponder]

    Ramesh349: Does your sketch show a flat plate for the top of the vessel? A 6' dia. flat plate, with a 50psi working pressure is going to take one mighty thick pl. or some serious pl. stiffening, or it will twist the flange right off the vessel, won’t it? A flat pl. will have a very high...
  17. dhengr

    Lug Support Design

    TylerM: Understand how the darn thing works, and being able to draw your own correct/accurate/ truly representative FBD’s (free body diagrams) of how it works, is far more important than worrying about a 1 or 2% change in the length of a moment lever arm. You are talking about an ‘H’ of about...
  18. dhengr

    Stacked horizontal vessel saddle support

    TylerM: This is undoubtedly a case where some FEA software would be helpful, particularly around the saddles. For some sort of a longhand, initial look..., I’d do the std. PV analysis for the typical tank stresses. Then, I would look at Roark’s Formulas or any number of good Strength of...
  19. dhengr

    Stacked horizontal vessel saddle support

    TylerM: No doubt, you could do what you seem to be suggesting, but the tank (PV) design and maintenance is a big enough problem without adding these external loads and conditions to the bottom tank. Why not design the bot. tank with a fairly typical saddle, and its own weights/loads on the...
  20. dhengr

    Shipping Saddle Base Plates

    PVEngineerCF: Well... you can’t ignore or neglect the thickness of the base plates, they are part of the design of the whole saddle. The idea of the saddles is to get all the loads (various loads and load paths) from the vessel down into the transporter or the permanent foundation, without...

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