Pressure in a vertical pipe

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Aljoscha
Posts: 2
Joined: Fri Dec 09, 2011 11:46 am

Pressure in a vertical pipe

Hello everybody,
how can I solve the following problem using the "pressure drop and flow calculator"?

I have a water tank with a water column of 50 meter.
At the bottom of the water tank is a straight vertical pipe of 800 meter length with a diameter of 0.3 meter.
Now I want to calculate the flow rate.

The question is what to use as pressure (p1-p2). Do I have a total water column of 850 mWS (50 mWS in the tank + 800 mWS in the vertical pipe) or is it just 50 mWS? Can I use the calculator?
If for example the total water column would be 50 mWS. Would than p1 =50 mWS and p2=0 mWS

Looking forward for any answers! Thank you very much

PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Pressure in a vertical pipe

If the tank is open to atmosphere your p1=0.
But as you do not have option to enter height in calculator, you can enter 50 + 800 mWS as p1. p2 = 0.
Also you have K1 = 0.5 (pipe entrance) and K2 = 1 (pipe exit) with total of K1 + K2 = 1.5 total resistance coefficient.

Hope this helps!
Pipe flow calculations - free fluid flow calculators

Aljoscha
Posts: 2
Joined: Fri Dec 09, 2011 11:46 am

Re: Pressure in a vertical pipe

It helps a lot. Thank's!
How did you receive the values for K1 and K2?

Regards

PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Pressure in a vertical pipe

You can find also K - resistance factor calculator there
Pipe flow calculations - free fluid flow calculators