Hi. I've been asked to provide som
Hi. I've been asked to provide som
(OP)
Hi. I've been asked to provide some information to a tank vendor for them to engineer and install pipe supports that will run up the side of their tank.
This particular system/tank is an exact copy of an existing tank system at another one of the clients sites. The tank size, pipe sizes, and everything is identical. Therefore, I was asked to go through the old documentation and find the loads from the previous job, and re-submit them to the tank vendor for them to perform the calculations required for them to provide attachments on their tank for our pipe supports. These attachments, on the existing tank will be simple stubs that our piping engineers will attach their designed supports to. Again, they will be copying the previous job's supports.
My question is this: while looking through the files, I noticed that the previous tank was designed to carry an actual pipe support (vertical) more toward the bottom of the tank, and then guides were used running up the side of the tank, up to the top, where the pipe went over the edge (it is an open top water tank), and filled the tank. To me, it would make more sense to put a pipe support (vertical) at the top of the tank, and guide it toward the bottom.
More specifically, here is what I'm dealing with: the tank is 55' tall.
This is what the existing tank is designed for:
Vertical support at 11'
Guide at 22', 33', 44' and 53'
I would have thought the tank should be designed for:
Vertical support at 44'
Guide at 11', 22', 33' and 53'
I thought it was more appropriate to 'hang' pipe, rather than support it from the bottom, letting it potentially buckle toward the top. Granted, the guides are not loose, there is only a 1/16" of a gap on any side of the pipe for it to move, so I suppose that the guides do somewhat act as a vertical support?
Can anyone clear me up, or at least, point me to a site where I can find a thourough explanation? Thanks so much.
This particular system/tank is an exact copy of an existing tank system at another one of the clients sites. The tank size, pipe sizes, and everything is identical. Therefore, I was asked to go through the old documentation and find the loads from the previous job, and re-submit them to the tank vendor for them to perform the calculations required for them to provide attachments on their tank for our pipe supports. These attachments, on the existing tank will be simple stubs that our piping engineers will attach their designed supports to. Again, they will be copying the previous job's supports.
My question is this: while looking through the files, I noticed that the previous tank was designed to carry an actual pipe support (vertical) more toward the bottom of the tank, and then guides were used running up the side of the tank, up to the top, where the pipe went over the edge (it is an open top water tank), and filled the tank. To me, it would make more sense to put a pipe support (vertical) at the top of the tank, and guide it toward the bottom.
More specifically, here is what I'm dealing with: the tank is 55' tall.
This is what the existing tank is designed for:
Vertical support at 11'
Guide at 22', 33', 44' and 53'
I would have thought the tank should be designed for:
Vertical support at 44'
Guide at 11', 22', 33' and 53'
I thought it was more appropriate to 'hang' pipe, rather than support it from the bottom, letting it potentially buckle toward the top. Granted, the guides are not loose, there is only a 1/16" of a gap on any side of the pipe for it to move, so I suppose that the guides do somewhat act as a vertical support?
Can anyone clear me up, or at least, point me to a site where I can find a thourough explanation? Thanks so much.





RE: Hi. I've been asked to provide som
Hanging pipe is good for the pipe, but bad for whatever you're hanging on to. Pipe is much more rigid than a tank wall, so support pipe risers from the bottom whenever you can.
http://virtualpipeline.spaces.msn.com
RE: Hi. I've been asked to provide som
Stephen Argles
Land & Marine
www.landandmarine.com
RE: Hi. I've been asked to provide som
RE: Hi. I've been asked to provide som
On tall towers, we typically support up high because there is usually a hard connection into the tower. By putting the support up near the nozzle, you reduce the potential for stresses due differential expansion between the support point and the piping connection. You do also get the benefit by "hanging" the pipe of avoiding column buckling in the pipe.
From what you describe, I see the pipe as being free to grow up w/o a nozzle connection to fight against. As long as the guides are close enough, buckling shouldn't be a problem.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.
RE: Hi. I've been asked to provide som
RE: Hi. I've been asked to provide som
http://virtualpipeline.spaces.msn.com