FLOW vs PRESSURE
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- Опубліковано 20 лис 2022
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In this Pump Report, Chad explains that positive displacement pumps are flow creating machines and pressure is the result. But what variables affect the amount of pressure? To learn more, visit our website at vikingpump.com.
#vikingpump #flow #pressure #pumps
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Hi, I'm Chad Wunderlich with Viking Pump - and this is a gear pump, a common type of rotary positive displacement pump. At the outlet, I have a meter to measure the flow delivered, and a transducer to measure the outlet pressure. So what's created by this pump? Is it flow? Is it pressure? Or is it both? You're watching the Pump Report. Alright before I get started I need to clarify one thing: there are two different kinds of pumps. There's kinetic pumps, like centrifugal pumps and positive displacement pumps like this gear pump. What I'm describing in this video will be more applicable to the latter. Positive displacement pumps are flow creating machines. With each rotation of the pumping elements, a volume of liquid is moved from the inlet to the outlet. Pressure is the result. But what determines how much pressure is created? Now there are three common components to determining the total pressure. And the first is a pressure difference between the source and the destination. One example would be pushing liquid into a pressurized pipeline or into a pressurized tank. Another common example is hydraulics where the pressure must act on the area of a cylinder to exert tremendous force. The pressure required is a function of the force required and the area of the cylinder to which the pressure is applied. The second component is pressure due to head. This is because liquid has mass. As you push liquid from a low elevation to a high elevation, pressure will increase. The higher the elevation or the heavier the liquid, the greater the pressure at the pump. You can feel the effect of this pressure when you swim to the deep end of a pool or observe the pressure delivered by your city's water tower at your kitchen tap. The third and usually the largest contributor for pumps is pressure due to friction. There are going to be frictional losses due to the flow of liquid through the outlet pipes, hoses, fittings, valves, and any other downstream equipment. So pressure and flow aren't necessarily exclusive...they can be related. As I speed the pump up, flow increases. And because of increasing friction losses in the downstream system pressure also increases. Positive displacement pumps are renowned for their ability to handle a wide variety of liquids efficiently. But it's important to remember to make sure that the pipes are adequately sized to allow that flow without exceeding the pressure rating of the pump unit and system. Alright, so while pressure may be the result of flow, simply put, positive displacement pumps are flow creating machines. To learn more about this topic or to view other Pump Reports, please visit our website at vikingpump.com. - Наука та технологія
Both types of pumps "create flow". Do both create pressure, no. Pressure is the resistance to flow. Pumps distribute their added energy into a system. Hydraulic energy can be represented by Pressure x Flow. Therefore the practical answer is pumps distribute energy into the system that results in both pressure and flow. If Energy added into the system by the pump is limited by the motor size and its efficiency to 1kW, power is Energy per unit time, 1kW/second, or 1000 Nm/s, or 1000 W/s is added into the system, then we can assume that pressure x flow = 1000. P x F = E. Just looking at 1 second, Energy is 1000 Nm. So the pump will make an energy distribution of 1000. Pressure is potential energy and flow is kinetic energy. We will get some combination of that which equals 1000. If pipe and equipment resistance to flow is high, we will get a low flow, kinetic energy expended will be low, say 100. Since P x F =1000, that leaves P x 100 = 1000. Solving for P, P= 1000/10 =10, a pressure of 10 results. If flow resistance is low, say 5, kinetic energy expended can be high. How high? P x 5 = 1000, so solving for potential energy, P =1000/5= 20. The pump creates flow, the pipe system resists flow. How much flow the pump creates is determined by subtracting flow resistance of the system, kinetic energy, from motor energy added to the system, and whatever remains is pressure, the potential energy.
Let’s go he’s back!
i have 2 wind blowers there is written PSI and i have one other there is written RPM. what is the difference
What happens to the readings of pressure and current indicators and the amount of water pumped when a break occurs on the main water line of the city network?
HI! I have a simple doubt: if at the delivery point my pressure is fixed (a huge pressurized reservoir, for exemple) and I increase the flowrate, what would happen at the pump discharge? Since flow is higher, but delivery pressure is fixed, the pressure at discharge would get low?
There are two possible outcomes at the pump outlet when increasing flow rate:
1. The pressure will at the outlet due to the controlled pressure environment.
OR
2. The pressure may due to the increase of line losses.
For more information visit our website at vikingpump.com or contact your local Viking Pump distributor here: www.vikingpump.com/contact/stocking-distributor
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@@VikingPumpInc😂 the pressure will 😶 or it will 😶. Why did both options not have anything definitive.
Hello sir can you explain is water turbine require water flow or water pressure
A turbine is a type of kinetic pump, similar to a centrifugal pump. It would not be a flow creating machine in the same way that a positive displacement pump would. This video does not dive deep onto that centrifugal side, but here's one that may help: ua-cam.com/video/m3i_5xP9PYU/v-deo.html
Pressure and Flow for a pump is quite confusing with Bernoulli's equations 😢
to be honest I came here to a have better explanation for my computer Pump
We need moore