Head & Friction Loss in PVC Pipe 6

[Antoniog1]

In regards to my earlier posting the ID of the pipe is 104.6 Milimetres AMSL Stands For Above Mean Sea Level, the pipe is 10000 metres long one pipe from reseroir A To Reservoir B with flow measurements taken at intervals with isolation & Scour valves along the pipe to try and determine a point where i have either an obstructed or squashed pipe reducing my flow rate into reservoir B. As can be seen reservoir A Is 47 Metres above reservoir B friction tables from the pipe manufacturer tells me at a head of 47 Metres, a distance of 10000 Metres of pipe should give me a flow rate of 7.5 Litres per second into reservoir B Equates to 450 Litres Per Min with only a measured flow of 310 Litres Per min, an actual drop of 140 Litres per min below calculated flow rate, speaking to the manufacturer in there experince with pipe flow rates have been higher than calculated not below i was just wanting someone else to put the figures into formulas to give me a second oppinion.
Regards Anthony

 

[Latexman]

Where's that diagram?

Good luck,
Latexman

 

[BigInch]

Water above and behind the pump is always positive sign and head lost due to pipe friction is always negative, wherever it is. Pipe friction NEVER helps anything, uphill or downhill.

Is your pipeline going up or downhill?

You have an elementry problem for which it should be easy to give you some advice, but nobody understands your configuration and confusion still prevails. I think it is better that you figure out how to make a diagram and get it posted, or list your flow elements and reservoirs in a complete and understandable manner, like the example I gave you in your other posting. Try it.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[hydtools]

I don't understand the flow loss or gain from one measurement location to another along the length of pipe, unless flow is exiting or entering the pipe. As I understand from the start of this thread, there is only one pipe. The flow rate should be constant through the pipe. Q = V x A = constant.

I don't trust the measurements reported. The measurements will have to be valid and believeable before the pipe supplier will believe the data or before you can compare prediction with measurement.

Did I miss something?

Ted

 

[Latexman]

hydtools - Me too. I asked him to explain the tests in detail, like where are the measured flow(s) going and not a word about it.

BigInch - if antoniog1 draws a diagram of this system using MS Paint (everyone has access to and knows how to use Paint, right?), can you tell him how to post it here like you did the output of BigBoy? Will he need to store the diagram on webspace somewhere to do this?

Antoniog1:

1 - Left click Start/Programs/Accessories/Paint, or:

S = scour valve
I = Isolation valve
T = tee or branch

~~~\ 60 m
\
\--I-T--\ 50 m
S \ /-----\ 45 m
\--S-T--/ 40 m \
I \-----\ 35 m
\
\
\~~~ 20 m

A picture is worth a thousand words!

2 - At these test points, is the scour valve mounted in the 104.6 mm ID PVC Type P Class 9 pipe that runs from Reservoir A to B?

3 - - At these test points, is the scour valve mounted in a pipe that tees (branches) into the 104.6 mm ID PVC Type P Class 9 pipe that runs from Reservoir A to B?

4 - At these test points, is the isolation valve mounted in the 104.6 mm ID PVC Type P Class 9 pipe that runs from Reservoir A to B?

5 - - At these test points, is the isolation valve mounted in a pipe that tees (branches) into the 104.6 mm ID PVC Type P Class 9 pipe that runs from Reservoir A to B?



Good luck,
Latexman

 

[BigInch]

Already told him above to refer to this thread for post How2

again,

See thread378-184348: "Parallel" Pump Head Calculation for how to post diagrams

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com