Convert pipe size to multiple smaller pipes
Convert pipe size to multiple smaller pipes
(OP)
I am bidding a project that will require a low water truck crossing( Peak data= 500CFS and 7F/S V) I calculate a 108" ID pipe will handle the flows but I need to use multiple smaller pipes (say 36") in order to keep the crossing accessible to trucks. The length will of pipe will be 30' and I will likely be using steel casing. I will have this fully engineered if we get the job but I am trying to deide how much money to put into this item.





RE: Convert pipe size to multiple smaller pipes
RE: Convert pipe size to multiple smaller pipes
RE: Convert pipe size to multiple smaller pipes
RE: Convert pipe size to multiple smaller pipes
Maybe calculate the pressure drop across the large diameter line, set that as your max allowable, and then back calculate how many small lines are needed to stay under that value (I would also toss on a 5 to 10% margin for good measure).
Just my two cents worth, I am by no means an expert.
RE: Convert pipe size to multiple smaller pipes
The rough answer is <about> .. yes ... twentysix (26) pipes of 36" diameter, flowing full, so an increase in the number is needed again, if not flowing full. PS that's 36" I.D.
Basically why a lot of culverts are big diameters.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Convert pipe size to multiple smaller pipes
RE: Convert pipe size to multiple smaller pipes
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Convert pipe size to multiple smaller pipes
So, analyze 30x pipes at 36" ?
10x pipes (in the middle) at 48" plus 5x each side at 36" ?
4x pipes in the middle at 72", plus 2x each side at 48" plus 2x more at the far ends at 36" = this would let the "middle of the sloped (?) ditch to be deepest at the center, with additional capacity as more flow is needed as the water gets wider in the "vee" shaped ditch. But the total height of the ditch + culvert is still substantially less than the original 108" pipe.
RE: Convert pipe size to multiple smaller pipes
Richard A. Cornelius, P.E.
WWW.amlinereast.com