- #1

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a pump capacity of 10 m^3/hr at 30 meters head. what does the 30 meters head mean?

thank you..

thank you..

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- Thread starter balotpinoy
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- #1

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a pump capacity of 10 m^3/hr at 30 meters head. what does the 30 meters head mean?

thank you..

thank you..

- #2

gmax137

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- #3

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- head x density x gravitational constant

is that right?

- #4

gmax137

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Right. [tex]V^2/2g[/tex] [tex] z [/tex] [tex] P/\rho g[/tex] all have units of length.

And if you multiply each by [tex]g \rho[/tex] you get units of pressure

And if you multiply each by [tex]g \rho[/tex] you get units of pressure

Last edited:

- #5

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no more deductions for pump efficiency?

- #6

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kindly help me with this one..

i want to compute the actual volumetric flowrate in line 1 & 2. discharge for both lines are in different elevations. given data for me is these;

mono pump capacity= 10 m3/hr at 30 meters

line 1 from tee to discharge is a 2-inch pipe

line 1 discharge elevation= 12 meters

line 2 from tank bottom to discharge is 3-inch pipe

line 2 discahrge elevation=11.5 meters

fittings/valves are present along the line, pls bear with my drawing..

i've been trying to figure out how im gonna use the available pump data in my bernoulli's equation.

and another thing is the flowrate. can i directily solve for velocity of fluid at the pump discharge from the given flowrate..

thank you in advance..

i want to compute the actual volumetric flowrate in line 1 & 2. discharge for both lines are in different elevations. given data for me is these;

mono pump capacity= 10 m3/hr at 30 meters

line 1 from tee to discharge is a 2-inch pipe

line 1 discharge elevation= 12 meters

line 2 from tank bottom to discharge is 3-inch pipe

line 2 discahrge elevation=11.5 meters

fittings/valves are present along the line, pls bear with my drawing..

i've been trying to figure out how im gonna use the available pump data in my bernoulli's equation.

and another thing is the flowrate. can i directily solve for velocity of fluid at the pump discharge from the given flowrate..

thank you in advance..

- #7

gmax137

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Above describes the situation for a centrifugal pump. If you have a positive displacement pump, the flowrate is constant; all you need is bernoulli. But I don't think you have a PD pump, because then the 'at 30 meters head' doesn't make sense.

- #8

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its a PD pump and that's the only data available for that pump since its old already.

so far here is what i did with my problem;

to solve for Q in lines 1 & 2, i first computed for Pressure at point B (pls refer to attached drawing) using bernoulli's equation in pipe A-B using 30 meters head as pump work and obtained my velocity at point B using the flowrate/area of pipe.

is it correct? and if so, how can i proceed to solve for flowrates in both lines?

thank you again..

so far here is what i did with my problem;

to solve for Q in lines 1 & 2, i first computed for Pressure at point B (pls refer to attached drawing) using bernoulli's equation in pipe A-B using 30 meters head as pump work and obtained my velocity at point B using the flowrate/area of pipe.

is it correct? and if so, how can i proceed to solve for flowrates in both lines?

thank you again..

- #9

gmax137

Science Advisor

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