pipe support
pipe support
(OP)
Hi everyone,
Some clients asked me to change the pipe support. Initially it was a concrete plinth with a plate on the top anchored with expansion bolts. They asked me to change the support using a plate with no expansion bolt simply inserted in the concrete plint. Since I am still new in this work, i accepted it. But this, in my opinion, does not really agree what I studied at university. First of all in my opinion, to insert the plate into the concrete could give problem due to the different thermical expansion between steel and concrete. Therefore it seems to me bizarre that there is not system to anchor concrete to steel.
In the attachment is possible to see what I did at the beginning (right) and what they ask me to do (left).
Maybe there is an explanation to this. I want just to understand it in order to avoid mistake in the future.
Some clients asked me to change the pipe support. Initially it was a concrete plinth with a plate on the top anchored with expansion bolts. They asked me to change the support using a plate with no expansion bolt simply inserted in the concrete plint. Since I am still new in this work, i accepted it. But this, in my opinion, does not really agree what I studied at university. First of all in my opinion, to insert the plate into the concrete could give problem due to the different thermical expansion between steel and concrete. Therefore it seems to me bizarre that there is not system to anchor concrete to steel.
In the attachment is possible to see what I did at the beginning (right) and what they ask me to do (left).
Maybe there is an explanation to this. I want just to understand it in order to avoid mistake in the future.





RE: pipe support
The issue isn't so much one of expansion - the actual amount of differential movement is minute for something as small as this.
The issue is about the forces the plate will see in operation. with those weird wedges, this appears to be designed to limit, a little bit, the sideways movement of the pipe. given that any serious force will simply result in the pipe lifting up and then falling off the support this anticipated sideways force must be quite low, however it means that force needs to be resisted and without some means of holding the plate to the plinth, the whole plate could move sideways.
I have seen plates with bolts and rods / short sections of re bar welded to the bottom to be set into the plinth just after pouring to give the plate some grip, but it comes back to anticipated forces on the plate from the pipe moving. sort that out first then apply some logic to the fixing of the plate.
Those angle welded on longitudinally are very odd....
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RE: pipe support
Littleinch, in our experience wich is the best solution to connect the plate with the plinth for this kind of support?
RE: pipe support
I still don't know what forces the plate is seeing other than vertical load.
If you want to restrict movement sideways normally a shorter length is used and they are welded like an L shape with the side part taller than half of the diameter.
It must be said that resting pipes direct onto plates / bars is now not seen as a good thing due to corrosion potential under the pipe and hence the use of clamp and shoes is much more common.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: pipe support
It is recommended to install a rod on the sleeper and structural support as per L.C Peng in his book "Pipe Stress Engineering". In many cases, when pipe sits on a flat metal support, moisture is trapped which leads to corrosion. The round edge of a pipe resting on the round bar prevents moisture from accumulating.
http://stoprust.com/i-rod-pipe-supports/
RE: pipe support
RE: pipe support
If the piping is insulated, you will need some type of clamped or welded on "shoe"
The typical piping loads are not that high and your lengthy support could cause problems if the piping moves in the least due to thermal expansion.
This type of support has been done a bajillion times before...
Look at these websites and tell us what you think....
http://www.pipepier.com/pipe_pier_150.php
http://www.pipingtech.com/index.htm?utm_source=Mai...
http://www.anvilintl.com/products/pipe-hangers-and...
MJCronin
Sr. Process Engineer
RE: pipe support
dbill74 The problem is that they told me to do not use the expansion bolt, but to insert directly the plate in the concrete.
RE: pipe support
This is much overdone for a small pipe like this.
Too much money there?
You can always weld a few nails under the plate for securing in the concrete.