Hi Guys,
Just wanted to close this by telling you we've decided to not use the rectangular pipe. Thanks for your help in this decision. We are moving the spillway and that immediately solves many problems. We will still have a square/rectangular transition section as we move from a 3' by...
Thanks UncleSyd,
If we start doing this on any kind of a basis (at this point, this appears to be the first (and only) in over 100 years) we will need to get some ASME materials and get our Mechanicals to show us how to do it.
For What it is Worth, I talked to the fabricator and his...
P.S. What Code???
What code covers rectangular pipes?
Besidesm who would be clueless enough to even try to use one? Oui, C'est moi. Mais ce n'est pas mon idée.
Mike and JT,
Still there?
I was originally planning on using a 4" radius at each corner, but I'm taking your suggestions and doing the whole thing round. Rough calculations on the sides certainly are an improvement since this eliminates nearly 2 feet. I would like to refine those...
Thanks Mike and everybody else.
I think this thread has about died.
I do appreciate your suggestions and comments. We'll see if once they realize just what this solution will cost them, whether they will want to do it or not... There are other, very different possibilities that...
vesselguy,
This was my first 'solution' but the guy who would have to crawl through the pipes disagreed. I may approach it again with the idea of an upstream manhole, but the area is really, really tight.
JT
Thanks. I have no problem accepting that the rounded corners will be stronger, I just do not have a way of calculating exactly how much. I may be overdesigning as I have the "stiffeners" carrying everything with their spacing being determined by the flat plate stresses.
Sorry, this pipe isn't necessarily the subject of the inspection, though it would be inspected. The things requiring inspection are 'upstream.' The gates at the mouth of this new, pressurized pipe, and a free discharging spillway above and ultimately to the side of the new pipe. Also the...
jt,
Would it?? We expect to have the steel bent into shape so rounded corners are a given (at least in my mind). My drawings all show rounded corners and I've seen that as a potential problem due to the high moments at the corners. I've been thinking I need to put some sort of plate from the...
arto etal,
I guess I've not given the limitations. This 'pipe' conduit or what-have-you is limited to the rectangular shape and cannot exceed 60" high, and preferably 24" wide though the stiffeners are going to make it wider. It is going into a 4ft wide by 5ft tall concrete box culvert...
Mike,
Thanks, I'll try to find ASME... and yeah, the HDPE is plastic and carries the water to its ultimate destinations. I just need to get it to where they can connect.
Yes, the 304L SS is lower, Fy=30,500 psi, but it is easier to weld as in less steps before, during and after. It has about 0.03% Carbon whereas the regular 304 has about 0.08%. If nothing else, I'm learning about stainless steel. 316L or 316 is much stronger, but cost about 1 1/2 times as...
The "pipe" has to stay rectangular throughout its length. No, the stiffeners (channel/angle/hollow setions, etc) will also be SS to avoid corrosion. May use 316L SS for the stiffeners for the slight additional strength, haven't yet checked availability. I'm not convinced they would change the...
Thanks,
I appreciate knowing I'm not totally out of it...
I mean, everybody keeps telling me it is no big deal, though none of them seem willing to step up and do it.
Suppose I could just use superglue?
g
Hello everybody.
I'm tasked to design a 23" X 54" rectangular pipe, about 100 feet long. The pressure is quite low, at about 12 1/2 psi, but the moments produced astound me. I'm looking at 3/8" 304 L Stainless Steel plate with channel stiffeners. If I could do a round pipe, there'd be no...
