Relation of Pressure and discharge 2

[Taha nasir]

I want to ask that if we increase the pressure in pipe, will the flow/Discharge increase ? with same pipe dia?

our 2 centrifugal pumps which were connected in parallel were giving 30 cubic meter water discharge each (total- 60 cubic meters)

when we connected them in series and increased the pressure in header, the discharge also increased.

 

[LittleInch]

If all other things stay the same ( fluid, length of pipe, pressure at the end point, temperature, height difference between inlet and outlet etc) then yes an increase in differential pressure from one end to the other should result in increase in flow.

without any more details such as your system design, pump curve etc it is not possible to comment further.

However it would seem that your pumps were rated / capable of more than 60 m3/hr and your system probably has a large static pressure element compared to frictional element i.e. it goes up a hill or has a high end pressure).

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[electricpete]

It’s not clear exactly what the question is.

You can predict what will happen by drawing a system characteristic curve and pump curves and looking at the intersection of those two curves (which is the operating point).

It seems like part of your question was comparing the behavior of two pumps in series vs two pumps in parallel? In that case, you can analyse that the same way. For pumps in series, you have to add the two individual pump curves along the vertical axis (Head or DP). For pumps in parallel, add the two pump curves along the horizontal axis (flow). If you compare the resulting series and parallel pumping curves, they intersect each other at some flow. Where you are operating in relation to this flow determines which configuration gives more flow. If your operating point (intersection with system curve) is above this flow then the parallel combination gives more flow in this system. If your operating point is below this flow then the series combination gives more flow in this system. In words, that sounds a lot more complicated than it does graphically… try drawing those curves yourself if this is your question.


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(2B)+(2B)' ?

 

[SandCounter]

For the general principle, there is a good set of diagrams here:

https://www.engineeringtoolbox.com/pumps-parallel-serial-d_636.html

 

[bimr]

A pump produces liquid movement or flow. A pump does not generate pressure. A pump produces the flow necessary for the development of pressure which is a function of resistance to fluid flow in the system. For example, the pressure of the fluid at the pump outlet is zero for a pump not connected to a system. In addition, for a pump delivering into a system, the pressure will rise only to the level necessary to overcome the resistance of the load.

 

[hydtools]

May I suggest you increased flow which resulted in higher system pressure. Or you increased the pump pressure capacity and delivered more flow to the system.

Ted