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Questions tagged [pumps]

For questions about the design, classification and working principle of pumps. A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action.

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Are there pumps that can vary their pressure and flow rate, while maintaining the same power?

To avoid the inconvenience of buying compressed "air" cleaners and scavenging quarters for refilling tires, I'd like to get a pump that can do 72 PSI (vapor pressure of difluoroethane minus atmosphere pressure) at ~2 liters/minute for dusting, and…
Yale Zhang
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Power in a continuous flow pump

I work with left ventricular assist devices in patients with heart failure. These devices operate by maintaining a fixed speed of a centrifugal or axial rotor. The native heart continues to contract creating pressure differences between the pump…
Todd D
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How to make a micro water dripping pump with little or no electrical input?

I would like to make/obtain a micro water dripping pump, as a component of an item I am designing, to irrigate a plant with a water drop every few seconds in a closed loop. With "micro" I mean few cm³ in size. I imagine this should not be bigger…
neydroydrec
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Pump Placement Question

I build an awesome skating rink for the kids. Now I have to flood it. I have the rink built 450 feet from the lake. The rink is 7 feet higher than the water. I have a 1.5-inch polyurethane rigid hose running from lake to rink (100% sure no air…
J McCaig
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Would too small tubing reduce the max head of a pump?

I got a mini-project: I want to automatically get rid of the water produced by an indoor air conditioner unit. Since the unit is underground, the water needs to climb ~2m to get to the outside. I found a cheap pump online that has a max head of 3m…
user81993
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What kind of impeller pump is this? (photo)

First, what kind of impeller and pump is this? I mostly see centrifugal impellers in the net. I googled about this but didn't find direct reference to it. Most are about centrifugal pumps. Although I managed to find a video that discussed…
Jtl
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Swash Plate Pump Design

My understanding of swash plates led me to believe that the pistons in a swash plate pump rotate around with the driving shaft along with the chambers in which they aspirate (e.g. M&S Hydraulic Youtube video on swash plate plumps). As the axial…
Jordan McBain
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Simplest Way to Make A Pressurized Water Reservoir

I have a vapor system that requires a 50 psi feed of DI water. Without getting fancy, is there a simple commercial off-the-shelf part I can buy, fill with water and hand-pressurize? Or something with an NPT inlet & outlet that I could pressurize…
phyllis diller
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Most efficient/low power consumption way to pump water

I am working on a small project where I, from a relatively confined space in a well that has a diameter of 30 cm, will need to transport the water upwards about 2 meters. I have been looking at ram pumps but cant really see a way to utilise that as…
Jeppe Mariager-Lam
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Do submersible water pumps need to be submersed in water to function properly?

I'm looking to build myself a cheap water fountain that filters out gunk for my cat. Here is how it will work (I think)... Anyway just wondering if the pump has to be submerged in water in order for it work properly. I was hoping not because the…
Sie
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Can a fully submerged submersible pump become air locked?

At a place I'm staying, there is a borewell whose design and construction I ignore and I have no means to figure out (total depth, cap etc.) The entire house runs on a limited electrical supply from solar panels, therefore, the setup is NOT designed…
geeheeb
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How to prevent ping pong balls from clogging the entrance to a tube they must be able to individually pass through

We have a claw machine that grabs a bunch ping pong balls that then drops them onto an incline that leads them to a 2 inch in diameter pvc pipe that they must all fall through. The issue is that when dropping several ping pong balls at once instead…
Amy
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How to calculate a circulation pump size?

I would like to get some help regarding sizing a pump. I'm working on a project in which we want to select a pump to generate a flow through a rectangular channel whose two ends (the inlet and outlet) are connected by a pipe. We want to place this…
grishma
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What kind of pump to choose for a weight-based rain gauge?

I'm designing a rain gauge which uses accurate electronic scales to measure weight of water (and therefore volume) that has entered the sump. Ideally the system will not require any manual intervention. When the water level exceeds some suitable…
keble
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Calculating the load torque on a turbine pump

How is the load torque on a turbine pump handled. Generally, with motors, there is a load attached to the shaft which resists the output torque of the motor however, with a pump increasing the flow rate of water, I assume the water should act as a…
Pelumi
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