What is Pump: Definition and 653 Discussions

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.Pumps operate by some mechanism (typically reciprocating or rotary), and consume energy to perform mechanical work moving the fluid. Pumps operate via many energy sources, including manual operation, electricity, engines, or wind power, and come in many sizes, from microscopic for use in medical applications, to large industrial pumps.
Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers and other components of heating, ventilation and air conditioning systems. In the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificial heart and penile prosthesis.
When a casing contains only one revolving impeller, it is called a single-stage pump. When a casing contains two or more revolving impellers, it is called a double- or multi-stage pump.
In biology, many different types of chemical and biomechanical pumps have evolved; biomimicry is sometimes used in developing new types of mechanical pumps.

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  1. M

    How to determine the power of a rotary lobe pump?

    Want to know how to get the actual power the pump needs. I can measure the flow rate by the flow meter and count the revolutions of the pump. But selecting the proper motor for the pump would be a problem. So I want to know how to determine the power of the rotary lobe pump and generate the...
  2. G

    Pump with intake and compression using different pressure ratios

    Lets say we got a larger cylinder-piston combo and a smaller one. First we move the larger cylinder, filling in with vacuum. Then we pump in air, using the smaller cylinder, isothermally, with variable expansion ratio. Here, we clearly have exp ratio > P_atm/P_final We then compress the larger...
  3. SlurryPumpPro

    Vertical Cantilever Slurry Pump Critical Speed

    Hello all, I am an engineer with a manufacturing company and I am working for calculating the critical speed for a vertical cantilever slurry pump. This pump design includes one ball bearing and one taper roller bearing within the bearing housing. Then the shaft extends vertically downward...
  4. C

    Calculating the force from a pump + nozzle system

    I am attempting to calculate the force (in KgF) of a water pump + nozzle system. I have the pump curve (head vs. flow rate) for the pump, the diameter of the connection hose (2 inches) and the nozzle diameter (1 inch). The connection hose between the pump and nozzle is very short (approx 10 cm)...
  5. Philip Robotic

    I don't know how I got "mysterious energy" in a Carnot heat pump

    So first I transformed the equation no 2 like this: $$|Q_L|=K\cdot|W|$$ And then I transformed the first equation to find ##|Q_Z|## $$|Q_L|=|Q_H|-|W|$$ Plugging the result into the first equation $$|Q_H|=K\cdot |W|+|W|$$ $$|Q_H|=|W|\cdot (K+1)$$ We know that the efficiency coefficient K is...
  6. Erik Ayer

    I Does downconversion cause pump photon wavefunction collapse?

    I saw a paper on an experiment where a pump beam first went through a double-slit, then was downconverted with BBO. Recently a friend with a PhD in quantum physics said the downconversion will cause the pump's wavefunction to collapse and the implication for this experiment is that the pump...
  7. tinakaran26

    Direct steam injection into cooling water line at pump suction

    Currently there is an operation scenario at one of our plant which directly injecting steam into cooling water line at pump suction in order to generate hot water at 60 deg C for circulation, by doing this its generate vapor at pump suction and lead to cavitation which ultimately damage pump and...
  8. billy k

    Solving Impeller Analysis: 3 Unknowns & 0 Inlet Velocity?

    Hello there, I am trying to analyze an impeller i found at home (small one) so i can find the torque-speed graph. The thing is that i get stuck in an equation with 3 unknowns instead of 2 and i don't know what else to assume. My approach is as follows: I take the usual equation: ## M = \dot{m} (...
  9. R

    Would a longer lever require less force to hand pump water? (PHOTO)

    I think that it would take less force to pump water based on the lever principle. But I'm not so sure! Here's a drawn photo.
  10. R

    Friction of Water Pumped Into 6in Tube from Chamber

    This is a deep well & the dimensions of the bottom chamber is 5x1x5ft which holds 187 gallons. The pump is located in this chamber with a piston/plunger only going up to the top of this chamber at 5ft. The pump pushes 187 gallons into a 6inch diameter pipe which is 1000ft long = 1,470 gallons...
  11. F

    Pulling a vacuum on a heat pump with a recovery machine

    I am a student attending an HVAC program at a trade school. Today I recovered refrigerant out of a heat pump in order to debraze the compressor out of the heat pump. My instructor has taught me how to use a recovery machine to recover refrigerant out of an air-conditioner or heat pump before...
  12. R

    If this hand water pump was instead at the bottom of a well....

    Read summary
  13. saxman2u

    Pump rainwater into the bottom or top of a tank? Which has the lower head?

    Hi, I have a rainwater collection system where we have to pump water to the main cistern during a rain event. The system works great the way I have designed it and the rainwater is awesome to use in the house and water the plants and grass. The length of pipe I pump the water is almost 300...
  14. Plat

    Turbo pump - vibration and noise at a certain RPM

    I have picked up a used pfeiffer turbomolecular pump and controller for pretty cheap. It runs like a champ, completely smooth and quiet except for when it’s first starting up. As it approaches 5500 rpm, it starts vibrating somewhat and sometimes produces a momentary scraping noise when the...
  15. Benjamin_harsh

    How can we pump air into a bicycle tire without opening the valve?

    How can we pump air into bicycle tire without opening the valve? I mean If valve (dunlop bicycle valve)is closed, then how pumped air going into the tire?
  16. Clout

    Fluid mechanics - pump in a horizontal pipe connecting two pipes

    So when the velocity of v1 and v2 is 0 (because the tanks are much bigger), the bernoulli equation to dh is dh = (dp-dpl)/(rho*g) with dp = Phyd / V = 1000W / 0.01m³/s = 10^5 Pa and rho = 1000 kg/m³ So I am getting first without the pressure loss on the orifice dh = 10^5 Pa / (1000 kg/m³ *...
  17. DaveC426913

    Troubleshooting a Pool Pump: Why Won't My Hayward Pump Draw Water?

    Well, I'm stumped. I've got this 1/4HP Hayward pump that simply will not draw water. I've removed every factor in the system down to the bare minimum, replaced everything in the system that can be replaced and applied silicone lube to everything that can't. I have a six foot length of new hose...
  18. O

    How to estimate the performance of a pump using Navier Stokes?

    Hello everyone, Attached is the homework problem (FluidHmk.PNG) as well as the attempt (Attempted 1 and 2). Just wanted to know if this is method to approach the problem Thanks in advance.
  19. K

    Need help in finalizing the vacuum pump to lift an object

    Hi, I have been asked to identify the right vacuum pump to lift the object having 500 grams weight with one suction cup. I am going through lot of materials to identify correct formulas to calculate the lifting force. and now I am able to calculate the theoretical lifting force. But seems, I am...
  20. F

    Plumbing Syringe/Stepper Motor Pump Design

    Hello. I've built this syringe pump. The chosen motor is a NEMA 11 with a maximum torque of 6 Ncm. The thread rod is an M5 with a pitch of 0.8 mm. The whole system will consist also of a long tube (1 m length, 3.175 mm external diameter, 1.5875 internal diameter), at the end of which I'll need...
  21. Harveylanc

    Reciprocating Piston Pump Air/N2 SCFM Flow

    Hello Everyone. I am new to the forums so I hope I am posting this in the best section. I am looking to buy a gas booster that is electrically powered. The factory cannot give me any sort of flow chart so that I can determine how long it would take to boost air or nitrogen from a lower pressure...
  22. B

    How to measure water flowing from a washing machine pump?

    Hi all Am trying to find a way to measure the vol/time flow of water from the washing machine. Is there an electronic component that can be used like a coil of copper wire over the tube and the do something with a microcontroller perhaps and it figures out much flow? by electromagnetic...
  23. Don Bori

    Hydraulic Oscillating Ram Pump

    How can I get the Input Torque required to pump the double-acting cylinders with the following specifications below? Ram Working Pressure = 2 bars Ram ID = 100 mm. Ram Stroke = 1,000 mm.
  24. R

    Pump rotation to provide pressure or volume flow

    how much rotation needs to start volume flow for a adjustable variable pump?.I get it 5pi from the book. Is there any rule that it needs such rotation to start volume flow. From where I get it?I think that pump designer does not give the information on the manual.
  25. ju456one

    How do you calculate the work required to pump water out of a hemisphere tank?

    <Moderator's note: Moved from a technical forum and thus no template.> > The tank (hemisphere) is full of water. Using the fact that the weight of water is 62.4 lb/ft3, find the work required to pump the water out of the outlet. The radius of the hemisphere is 10. ##V =\pi x^2 h## using the...
  26. Akash47

    Calculating Pump Power for Well Water Removal

    Homework Statement A well has a diameter of 6 m and a height of 15 m.2/3 of volume of the well is filled with water.A pump can vacate 1/3 of volume of water from the well in 7 minutes 20 seconds.What is the power of the pump? Homework Equations W=mgh, P=W/t The Attempt at a Solution The...
  27. F

    Can a defective DRC on a heat pump cause the fan motor to go bad?

    I noticed that the outdoor fan on my residential, split-system heat pump stopped working in mid-October. I don't know for sure exactly when my outdoor fan on my heat pump stopped working. It might be that my outdoor fan did not work for months before I noticed that the outdoor fan did not work...
  28. F

    Why does the outdoor fan on a heat pump need to run on heat mode?

    The outdoor fan on heat pumps always runs when the compressor is pumping refrigerant when the heat pump is in heating mode unless the heat pump has defect(s). I don't understand why the outdoor fan on a split system heat pump needs to run when the heat pump is in heating mode. When a split...
  29. D

    Heating efficiency of a Heat Pump and a Space Heater

    Homework Statement Instead of pumping heat into the cabaret air from the outside air, you could simply put an electric space heater inside the cabaret. A space heater turns electrical energy directly into thermal energy. Why would operating a space heater consume more electric power than...
  30. M

    Find the pressure put into a box by a hand-squeezed pump

    Homework Statement A spherical hand-held pump with a radius r is used to pump air into a cube with a length L. The pump and cube are connected together by rubber tubing. Express the pressure stored in the box as a function of the number of times the pump is fully squeezed. Imagine the...
  31. O

    Liquid temperature increases when flowing through a 100% efficient pump?

    Hi, For an ideal Rankine cycle, the temperature-specific entropy diagram can be given as follows, The pump in this cycle is isentropically 100% efficient. My question is that why the temperature of the water increases as it flows through the pump (point 1 to 2) if the pump is 100%...
  32. E

    How to calculate the required length of an axial pump piston

    Based on other parameters how do you calculate the required length of a piston inside the cylinder block of an axial piston pump? What are the relevant equations? I've found many for the required diameter but not the length.
  33. Enzo777

    Automotive Finding the Peak Pressure of a Diesel Injection Pump

    I am trying to find peak pressure of a diesel engine injection pump.. It doesn't have to be exact but +/- 1000psi would be fine. The basic principle is the same as an engine. Piston goes up and covers a fill hole, once it is covered the only way it can flow fuel is through the injector, so...
  34. A

    Excess Heat Generated By a Liquid Ring Pump

    Hi all. First, some context. I work for a small seed oil extraction plant where we cold press the seed then solvent extract the residual oil from the presscake. In the solvent extraction plant we use liquid ring pumps to pull the required vacuums. The Plant Vac Pump (PVP) is used in all...
  35. E

    Selecting an Axial Piston Pump for a 1000m Manned Submersible Application

    So I posted yesterday about appropriate pumps for pumping water out of a ballast tank in a manned submersibles at a depth of 1000m. I decided to switch to an axial piston pump. I got that the require pump head is approx. 410 m and the required power input provided by the pump is approx. 18 000W...
  36. E

    Can Centrifugal Pump Displace Water Down? | Small Manned Submersible

    Hello, apologies for the crude drawing. I was wondering if it is possible to have a centrifugal pump that pulls in water and pumps it out down like in the drawn picture? I know usually its to displace water up. I always see centrifugal pumps with discharge oriented up like in the photo. If it...
  37. G

    B MHD pump idea for school project

    Hello everyone, I wanted to ask one question. My friend has a physics exam at school were the topic is to come up with a interesting yet simple physical device that would prove a single or multiple physics concepts. Now we were thinking that it would be interesting to experiment with the...
  38. K

    How to calculate effective pump flow-rate across a filter?

    My issue is related to the actual flow-rate I obtain when sampling air across a filtering membrane. Each pump reports a nominal amount of air that it can draw in a certain amount of time (i.e.: flow-rate, like 10 liters per minute), but this is generally reported assuming normal temperature and...
  39. Theerapat

    PD pump (Rotary lobe pump) -- loud noise

    Hello, I have a problem with the rotary lobe pump, it causes a very loud noise when running. The pump specs are as follows: Liquid: Syrup (The liquid is in the 15,000 liters tank.) Viscosity: 2200 cPs Temp: Ambient Flowrate: 15 m3/hr Discharge pressure: less than 2 bar (open ended pipe) Inlet...
  40. S

    How to choose a pump for a simple irrigation system

    We are planning to plant 500 trees, and we want to water it, but we are not sure how to calculate the suitable pump for it, and the holes diameters that we will pinch for each tree (500 holes). The system will include two elbows, and the distance of the pipes are all included in the below link...
  41. S

    Pressurizing Argon Gas: Pump or Compressor Options?

    I need to pressurized argon gas from 1 bar pressure to 2 bar pressure. Flow rate outlet is 0.5 LPM. Can anybody suggest me a pump or compressor which is small in size? Minitiarised diaphragm seems good option but is it right one?
  42. R

    Multi-Stage Pump: Understanding Flow Rate & Head

    Hello. I try to understand how multi stage pump (few impellers in a row) influence on flow rate and head. Thanks
  43. A

    A fascinating fault with my automatic soap dispenser

    I have a Dettol automatic soap dispenser (see fig. 1) which uses a little propellor-type pump to let out a small amount of soap when you put your hand in front of the passive IR sensor. It's been working fine until just before, when I turned the lights off in the kitchen (night time, so...
  44. kunalvanjare

    Determination of delivery pressure from pump

    We want to know how can we determine the pressure of the liquid at the delivery end of the pump. We have a centrifugal pump and a 2" pipeline at the delivery end. Pump delivery performance as per catalog is 510LPM @20 mtr head to 348LPM @36mtr head. The delivery pipe is connected to a manifold...
  45. M

    Unnecessary Pump in a Frictionless Pipe: Impact on Pressure and Work

    Imagine a pump is installed in a pipe where there would be no need for it (no friction, no height difference, etc.). In order for the energy balance to be correct, does this imply that the fluid would experience friction inside the pump the same as the head provided by the pump?
  46. T

    Head Calculation of a hot water circulating pump

    Hello, I have the following hot water system. I have a water heater with a pressurized cold water inlet. A re circulation line is taken near the farthest fixture passed through a circulating pump and back to the heater inlet. When calculating pump head, do I calculate pressure drop in the entire...
  47. M

    What is making this sound? (in a Rotary lobe pump)

    What is the reason making this sound?? ( Rotary lobe pump)
  48. M

    How to know the Net Inlet Pressure Required by the pump?

    Net Inlet Pressure Required (NIPR) is an individual pump characteristic, determined by test, of what pressure energy is needed to fill the pump inlet. How to generate the curve of NIPR or how to know NIPR of the pump if I am a pump manufacturer??
  49. A

    I Cavitation in a closed loop pumping system

    Dears Kindly, I want to hear from you regarding this topic. The system is closed cooling system. I believe it is difficult to attribute the sound you hear from centrifugal pump to be a cavitation especially if the discharge pressure is normal. The last time we had a problem with this system...
  50. F

    Pumping Water -- Please check my pump system design work

    Hey Folks! Just need a quick sanity check ... Putting in a new 4in well and submersible pump ... trying to wrap my brain around the "physics" of it ... Here is what I ***Think I Know*** : 1) The Energy required to move any given volume of water to ground level can be calculated using M*G*H ...
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