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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1answer
16 views

Will decreasing a pump's flow rate decrease the NPSHR?

I have a small open hydraulic system and I simply need to circulate hot (85C) water from the bottom of a reservoir back into the top at ~4GPM. At its lowest point the system has only 3ft of static ...
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3answers
74 views

What is this mechanical pump called?

I am unable to find it again but I once heard of a type of air pump that involved a pair of offset archimedes screws inside a cylinder. The point of the device was that as the screws would turn ...
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17 views

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 ...
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1answer
42 views

Does any know what kind of pump “Colossus” used for saving the Notre Dame Cathedral?

Does any know what kind of water pump the French Firefighting Robot Colossus used to Help Save Burning Notre Dame Cathedral? What kind of water pumps do fire fighting vehicle use or fire fighting ...
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1answer
31 views

What is the difference between a single-stage pump and a centrifugal pump?

Here is the small $12 \; V$ pump that I am looking at. The manufacturer called the product as DC brushless centrifugal circulation small water pump but under its description it mentions that it is a ...
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1answer
39 views

How does the efficiency curve of a well pump shift with speed?

Well pump manufacturers publish "efficiency curves" for well pumps, such as this one (the curve that is most sharply convex down, whose Y axis is read from the "% EFF" scale on the ...
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1answer
553 views

Can you help me to interpret technical drawings?

I'm trying to find out the angle/ length of the oblique line, or the solid angle of the conic part. This is what I've tried so far: According to the pythagorus theorem the length of the line is equal ...
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5answers
60 views

Small water pump powered by wind turbine : what type?

I need to aerate a small pond in my garden. I would like to build an autonomous system with a small water pump. The power would come from a small vertical wind turbine I will build. Since my pond is ...
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32 views

Pump system with dynamic head

Given: A pump system is defined with dynamic head of 46 feet. The height between the static pressure gauge and the surface of the water is 9 feet. Assumptions: Friction losses between the tank and ...
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1answer
31 views

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 ...
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1answer
54 views

Low maintenance device to trade flow rate for lift height?

Is there a compact device which can trade flow rate for lift height without too many moving parts? My particular application is a 10 meter deep and 10 centimeter wide well with shallow water level, ...
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2answers
24 views

Using a Threaded Rod and Internally Threaded Tube as a Piston Pump

Im looking for a low cost, high pressure pump with good flow/pressure control for an espresso machine (a lot to ask, I know). My first thought was using a screw-driven piston. This will work, but Im ...
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1answer
34 views

What does the author mean? Turbomachinery - Reaction

I am reading a book of Fundamental Energy Systems. The author describes the rate of change in head for a turbomachine as: $$ \frac{1}{2}[(V_1^2-V_2^2)+(U_1^2-U_2^2)+(V_{R2}^2-V_{R1}^2)] = H =U_1V_{u1} ...
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1answer
40 views

Does air flow rate of an air pump imply the same rate when using it to pump water via air pressure?

I want to build a machine that pumps liquids (roughly density of water) out of an enclosed cannister. The cannister has for one inlet for air at the very top and has an outlet (near the top as well) ...
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2answers
40 views

Hydraulic energy recovery for high-pressure, low flow (non-steady state) conditions

What would be the best way to implement hydraulic energy recovery while de-pressurizing a pressurized volume of silicone oil initially at 1500 bar. Can a piston pump be concievably repurposed as a ...
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1answer
36 views

Running a hydraulic pump below minimum RPM

If I had a pressure compensated, hydraulic piston pump, how might the performance look in terms of pressure if I were only looking in the regime of 0 RPM and the minimum ratedRPM? I.E If a pump was ...
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1answer
38 views

Quantifying the reaction force on fixed tubing connected to a peristaltic pump

I am not sure how I should consider the forces due to hydrostatic pressure when calculating the reaction force due to a fluid being pumped through fixed tubing with a peristaltic pump that I am using ...
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1answer
26 views

How could an absorbent material be emptied?

I have been thinking about this for quite some time: Given a foam or other absorbent material saturated with a solvent, how could you draw all the solvent to the top of the foam (basically how could ...
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0answers
30 views

How energy intensive is creating artificial islands in the IJsselmeer?

The City of Amsterdam is building a series of artificial islands for new housing. One of them is Centrumeiland. Its size is 13 ha. (130,000 m2). Its creation requires 800,000 m3 of sand (Source), i.e. ...
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23 views

Possible to suck water through manual bilge pump using a transfer pump?

I dug a shallow well (12' deep) on a remote off-grid Florida Property I own. The well is a simple 1-1/4 PVC Sand Point well I hammered in the ground. I then used a rubber coupler to attach a cheap ...
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0answers
37 views

Volumetric oil pump efficiency goes up when viscosity goes down?? Strange behaviour

Riddle me this : we are driving an external gear pump (this kind) at a fixed RPM. At start, when the oil temperature is low (and viscosity high), the volumetric flow is much less than when the oil ...
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1answer
58 views

How is the ideal Euler line on a pump curve derived?

This website provides Euler’s equations for turbomachinery and solves a sample problem using velocity triangles. The problem prompt only provides the speed of the pump and the geometry of the pump and ...
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0answers
23 views

Finding characteristic time required to reach steady state in the pump equation

Consider the pump equation $$\rho \frac{\partial w}{\partial t} = K' + \frac{\mu}{r} \frac{\partial }{\partial r} \left(r \frac{\partial w}{\partial r} \right)$$ Subject to $w(r=R,t)=0$, $w(r=0,t)$ is ...
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50 views

Pump Power Question

Consider I have a pump sized to deliver 200 gpm of a fluid with a specific gravity of 0.7 and a total differential head of 60 ft of water. What is the hydraulic horse power? To calculate the hydraulic ...
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2answers
104 views

How to measure absolute zero vacuum in pumps

In a vacuum pump, does the inlet pressure measure closer to 30 inHG? The following is a pure water pump, a 100w 8 meter regenerative turbine pump. Not a vacuum pump. Maybe the reason it couldnt get ...
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1answer
38 views

Pipe with change of section

I'm a novice in mechanical engineering and I'm having some troubles to find a pipe that change from one section to other. In this case I want to connect a circle section to a rectangular section. I ...
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1answer
33 views

Pump Terminology: Suction Piping vs Suction Waterway

Karassik and McGuire state in their 2012 book, [1] p. 415, The available energy that can be utilized to get the liquid through the suction piping and suction waterway of the pump into the impeller is ...
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4answers
85 views

What kind of pump not limited by atmospheric pressure?

Most pumps like centrifugal pumps are limited by atmospheric pressure. This is because the pump simply create a vacuum where the atmospheric pressure pushes the water into it. Hence there is a limit ...
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1answer
394 views

Determining Pump Dead Head Pressure and Pump Curve

I want to verify the pump curve of a regenerative turbine pump. The manufacturer doesn't supply any pump curve of it. This is the test setup. With the discharge valve shut off (plugged) and water ...
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1answer
99 views

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 ...
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4answers
156 views

How to divide the water flow into outlets with equal flow each?

I'm designing a machine that uses water to boost fish in one phase of a process. My main concern is how to split the water flow that I get from a water pump in to $N$ outlets with same flow rate. The ...
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2answers
71 views

Archimedes screw pump

i want to know if an Archimedes screw pump is more eficent that a modern screw pump to elevete clean waters 4 meters i saw many modern screw pumps smaller and want to now about the efcency of ths two ...
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3answers
45 views

Separate air from water for water pump in aquarium

I'm using the following setup to pump water out of a space below the gravel (yellow) in my aquarium: The tubes displayed as lines are 12/16mm silicone tubes. The pump is a 300l/h electrical water ...
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1answer
90 views

Accounting for pressure energy in Euler turbine/pump equation

For all the analysis to find work done by a compressor or work done on a turbine, the book I'm reading (Fundamentals of Turbomachinery by Venkanna B.K) uses the Euler turbine and pump equation, $$W=\...
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1answer
30 views

Will an electric water pump has slower flow if it must pump through a longer tube?

I am planning a series of ponds, where the first pond (near the source of electricity) has the highest water level, the water flows to the second, lower pond, via a small water fall, and to a third, ...
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2answers
166 views

How to calculate flowrate of water through a crosssection of pipe?

Assume we have a pipe with a diameter of 10mm. Water is flowing through that pipe and we know that the water pressure at the 'open' end of the pipe is 2 atm. How would one go about calculating the ...
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1answer
85 views

What is the force needed to exert on the piston for a certain extrusion rate of a syringe tube?

I am trying to design a syringe pump for microfluidic extrusion uses. I have a 5cc syringe tube that I will use as the cartridge. We would be using it to extrude a variety of materials so the ...
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1answer
59 views

How can I create a small pump that can pull fish to a higher elevation without killing them?

(for the record, I already attempted to ask this in the physics stackoverflow) I'm attempting to create something similar to a vertical multi-siphon. The device would pull water from multiple sources,...
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2answers
59 views

Divide Flow and Maintain Pressure

Im in the process of building an espresso machine from readily available parts. I have a solenoid pump that supplies pressurized hot water to the coffee grounds. I want to be able to tune the pressure ...
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1answer
25 views

What pump to use to pump latex?

I am trying using pump to promote circulation of latex solution in a latex dipping tank. Is there any pump that suits this purpose? Also, is there any better ideas to promote circulation of the latex ...
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1answer
59 views

What is the amount airflow needed from Aquarium Air pump per minute to make a DIY CPAP?

I am trying to make DIY Bubble CPAP that can put a constant pressure on patient. I am using an Aquarium Oxygen pump as air source. The motor says 38L/Min in the spec. And by googling I found that an ...
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1answer
25 views

Fully saturated liquid and vapour

In terms of fully saturated vapour and liquid for water. Why in a real world heat pump cycle for example may the water not exactly reach these saturation lines as indicated in an ideal cycle?
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1answer
352 views

Running a well pump rated for 230V on 208V power

I have a well with a 1.5 HP pump. The pump is rated for 240V input. At the moment, the only nearby available power is 4-wire 208Y 3phase. I am considering connecting two of the three phases to the ...
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1answer
25 views

Can air-powered diaphragm pumps pump out the effluent at a higher pressure than inputed?

I am working on an acid filtration system and I need to be able to pressurize the effluent from the diaphragm pump such that the acid can be forced through a filter. I am not quite sure if a diaphragm ...
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0answers
19 views

Motor with Water Pump Through Shaft?

I am attempting to drive a device with a motor, but also require water input. Is there such a device that serves as both a drive motor with a water pump through the motor's shaft? In essence, it ...
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2answers
54 views

How can I build a regulated pressurised air supply?

I need a source of air pressure for an air bearing (3D printed cylinder that expands air upwards like an air hockey table). I would like to be able to control the flow of air. I don't have a lab air ...
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1answer
98 views

Rotating Swashplate on Piston Pump

A piston pump has a swash plate that pivots back and forth to control the flow rate of the hydraulic fluid. Is there a version of this pump where the swash plate rotates like a cam instead of the ...
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0answers
131 views

Using one electrical pump for multiple hoses

I'm currently trying to figure out a cheap way to build a cocktail machine. For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
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2answers
46 views

How to add a controlled amount of a nutrient solution to a water line

I have an existing water supply system for the cattle on my farm whereby 6 troughs located in different fields are all fed from a common header line. The pressure in that line ranges from 3-5 bar (It’...
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1answer
56 views

Inlet Mach No for a centrifugal pump?

Recently I have come across a question as follows: At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity ...