Pipe manifold concrete support saddles
Pipe manifold concrete support saddles
(OP)
We have a DN1400 Epoxy coated steel (sch10) manifold in a pumping station which receives 9 x DN800 pipes from the 9 canister pumps. From the DN1400 manifold there are 2 x DN1600 pipelines transporting the raw water up to the treatment plant.
The DN1400 manifold is located within the pumphouse building and is supported on 6 x concrete saddles which are positioned between the DN800 connections. The saddles sit on the main floor slab.
What is the correct construction for such a saddle support? Is the pipe positioned / levelled first and then the formwork / rebar positioned around the DN1400 manifold and then the concrete mix poured?
Is any lining required between the pipe and the saddle? Is any room left for 'grouting' similar to installing a pump base for instance?
Best Regards
John
The DN1400 manifold is located within the pumphouse building and is supported on 6 x concrete saddles which are positioned between the DN800 connections. The saddles sit on the main floor slab.
What is the correct construction for such a saddle support? Is the pipe positioned / levelled first and then the formwork / rebar positioned around the DN1400 manifold and then the concrete mix poured?
Is any lining required between the pipe and the saddle? Is any room left for 'grouting' similar to installing a pump base for instance?
Best Regards
John





RE: Pipe manifold concrete support saddles
RE: Pipe manifold concrete support saddles
I note from the sketch that the saddle contacts the pipe at the 8 O'clock and 4 O'clock positions on the pipe.
Is that also standard design? I do agree with that incidentally, just that the current saddle design shows it with 9 and 3 O'clock!!
Regards
John
RE: Pipe manifold concrete support saddles
Where thrust generated in a pipe surge (power failure) is possible, the saddles should be extended up to the mid point of the pipe.
RE: Pipe manifold concrete support saddles
And the cushion between the steel and concrete is important.
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P.E. Metallurgy, Plymouth Tube
RE: Pipe manifold concrete support saddles
RE: Pipe manifold concrete support saddles
RE: Pipe manifold concrete support saddles
RE: Pipe manifold concrete support saddles
As the DN1400 manifold receives flows from the 9 DN800 feeder pipes from the pumps, it is pliable that we can have a power cut. It has been a common occurrence in northern Iraq so has voltage stability. Another issue!!
The two DN1600 rising mains that discharge from the DN1400 manifold (via 1400/1600 expansion pipe) do include 2 DN400 surge relief valves in each DN1600 pipeline to alleviate surge. (Bermad type 735)
With controlled start /stopping of the pumps, the pressure in the DN1400 manifold I would have thought be fairly stable.
How is it possible to calculate a lateral thrust in the 9 o'clock 3 O'clock direction in order to determine whether the manifold requires additional side supports rather than mass on saddle vertical load?
EdStainless, what do mean by 'cushion between the steel and concrete'?
I assume you are saying that the 25mm epoxy (non-shrink) grout is not sufficient?
Grateful for you help everyone. I'm really looking forward to the construction phase.
RE: Pipe manifold concrete support saddles
RE: Pipe manifold concrete support saddles
If however you need to get the supports in first you will need a pipe of the next size up to box in as per the drawing from bimr, otherwise you can't pour the curve in the correct line and height. Either that or you pour as much as you can and then leave the last bit when the pipe is there.
Either way you need a good accurate setting out of support line and level.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipe manifold concrete support saddles
Pipe support design is, IMHO an area where engineering, science and Voodoo all intersect..... ;)
MJCronin
Sr. Process Engineer
RE: Pipe manifold concrete support saddles