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.
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.
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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? :-)
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...
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...
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...
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...
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...
