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bimr, You noted that any fluid velocity over 8 ft/s can result in excessive erosion in the pipe. Just curious where you got that number (don't mean to hijack the post, just have a possible issue within our system where excessive flows through a smaller diameter pipe may cause this erosion with...

From what I've seen in our system, it's like bimr quoted, size x 3 + 2 or 3 (give or take). Every 6 inch I've ever closed has been 18-22 turns.

Thanks for the reply We had initially suggested that as well (if they went back far enough (6-8m), they might even have gotten away without any bends), but they decided on this route instead (2m out from bend to transition coupling). I'm just trying to get a good idea of what to do to fix it...

There is a sewer line being run through our system that directly conflicts with an existing 8" AC line. The solution was to keep the sewer line on it's current course and move the water line up and over where the sewer is going to go, leaving a separation of 0.5 meters. I started to type out...

This is sort of the procedure that I use to flow test the hydrants in our municipality and determine what color to paint them. http://www.firehydrant.org/info/ftest1.html Basically, you - take static pressure - flow hydrant - take residual pressure - take flow reading (pitot) - calculate the...

Thanks for all the replies! bimr, how did you know that the flow can be expected to be around 10 ft/s? I'm familiar with the Hazen-Williams equation/nomograph but wasn't sure what velocity I should plug in

I'm afraid there is no hydrant nearby. The line comes off our system right before our chlorine contact chamber (it's irrigation water only) at the start of the system. Is there a theoretical maximum for a 6" line with a certain amount of pressure?

Not necessarily no. We have a 6" C900 line feeding an orchard/vineyard off of a 24". They are allowed a certain amount of water due to water licenses, but there is no meter on the line. Just wondering what the maximum flow that 6" would be capable of? Would a modeling system like EPAnet be a...

How would I go about determining the maximum amount of flow through a pipe of certain diameter within our distribution system? The info I would have at hand would be pressure, diameter, pipe type, etc.

I drew up a quick spreadsheet on excel for the different values (attached), does this seem correct? http://files.engineering.com/getfile.aspx?folder=5b54977a-079b-438f-b3dd-efb2e4893f02&file=Pipe_Flushing_-_Required_Flows.xls

What velocity would I look for to achieve a proper scouring in a water main? 2.5 ft/s? 5 ft/s? Any links? Thanks!

Neptune makes one (http://neptunetg.com/products/meters/fire-hydrant/) but it's probably cheaper to do like coloeng said and use a 3" turbine.

Our municipality has always required the installation of a "flex joint" wherever there is a passage under an AC main. Line is shut down, snapped and a piece of C900 is installed with two couplings.