Pump Definition and 655 Threads

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. A

    Heat pump problem with heat loss?

    Homework Statement Consider a heat pump used to heat a house to 70°F when the outside temp is 5°F. The total heat loss from the house is 10000 BTU/hr. Efficiency of the heat pump is 45% of the theoretical maximum. What will be the power used by the pump? Homework Equations e (or cop) =...
  2. A

    Vacuum Pump Solution for Perfectly Sealed Chamber

    hi to all, i have been trying to find some similar project solution on the internet but so far have found nothing, so i am posting here. here is the setup ( see attached picture) : in "fig 1" a metal chamber, perfectly sealed contains inside it a balloon filled with air (red color). the...
  3. K

    Pressure after Pump with -0.4[bar], 0.8x104[N/m3], 3[m/s], D1/D2=1.4, HP=30[m]

    Homework Statement A pump is on a line. the data are: P1=-0.4[bar] \gamma=0.8\cdot104[N/m3] V1=3[m/s] \frac{D_1}{D_2}=1.4 HP=30[m] (head of pump) See attached drawing. Homework Equations Bernoulli equation: H_1+\frac{V_1^2}{2g}+\frac{P_1}{\gamma}+H_P=H_2+ \frac{V_2^2}{2g}...
  4. A

    Can I Connect a Hydraulic Pump to a 100hp Motor for 80 N*m on Each Wheel?

    hi i have a problem i have a motor 100hp and constant 2500rpm i need to connect to him hydraulic pump, that will rotate hydraulic motors connected to the wheels. i need to get about 80 N*m on each wheel how to solve this problem? what formulas i need? thank!
  5. D

    How to calculate HP pump water output flow

    Hello everyone, I'm new here, sorry if it's off topic. I need to buy high pressure pump and was asked by supplier these questions. I'm a sales person and physics is not my very strong side :( I've got some answers on it (posted below questions). How can I calculate question 6? If it's...
  6. Q

    How Much Power Does a Pump Need to Move Water from a Deep Hole?

    This is a high school work/power problem that I'm struggling with: An electric pump is used to pump water from a 40m deep hole to the surface. If 1200kg of water is needed every 2 minutes and the water is released at 12 ms-1 at the surface, what should the minimum power of the pump be...
  7. R

    How to calculate a jet pump thrust force?

    hi everyone In order to calculate the thrust force of a jet pump , what must I know and what is the formula used? thanks :)
  8. A

    Pump Flow Calculation: Selecting Areas & Determining Rate

    Hello, When selecting a pump one should calculate the flow rate of the building supplied. To determine the building's supply one should select the longest piping distance and the the area where the most flow is required, right? or it can be multiple areas «, or one should select all the areas...
  9. S

    Thermodynamics for a geothermal heat pump

    I'm going a bit off the reservation to try something experimental when I attempt my own HVAC installation and I'm having some trouble determining a few things. I want to transfer heat from water flowing in a 3/4" copper tube that is submersed in a larger body of water. The copper pipe has a...
  10. K

    Torque calculations for peristaltic pump

    Hi all, I have a peristaltic pump that i need to rotate at 26 rev/min. The gear arrangement attached to the pump is calculated at 13.1:1 therefore I am assuming an input speed of 340rev/min is required to produce a reduction in speed to the desired output of 26 rev/min. Gear A (1st...
  11. N

    Conservation of flow in a pump

    Hello. I am writing a relatively simple simulation code for looking at transient temperatures in a surge tank, which reflects a real-world system. The tank is hooked up to a recirculation loop with a pump and a heat exchanger. The pump has an average flowrate of 500 GPM. Despite the...
  12. H

    Vibration of a diaphragm pump in a soldering hot air station

    All, I am an engineer that occasionally needs to modify or rework circuit boards. I have a hot air rework station that uses a diaphragm pump to push air through a heating element. The result is air up to 550 degrees celcius. I can effectively rework most circuit boards. Unfortunately the...
  13. V

    Comparing Vacuum Capability of Pump Models WELCH 1375 & PFEIFFER DUO65

    Dear All, Appreciate if you can guide me on understanding the ultimate pressure of vacuum pump. I have two models for review. One has ultimate pressure of 1 x 10^-4Torr the other has 2 x 10^-3Torr. From this can it be said that the vacuum capability of the first pump (1 x 10^-4)...
  14. M

    Building an Electron Pump - NPL Physics Academy

    Hi, In the next week I am going to NPL for physics academy and I will be designing and building a prototype electron pump. I've tried to look for articles or books related to electron pumps or how to build them but I simply can't find anything at all. Does anyone have any material at...
  15. P

    Troubleshooting Low Pump Discharge: Tips to Boost Speed and Output

    I have a 12v DC (rotary vane type) pump that is connected to a 12v auxillary battery. The battery is 12vDC 70Ah and it charges itself with the truck's alternator, which is 12 volts, 35 amps. the pump is 1/4 hp, and it draws 20 amps max. The problem is, the discharge output of the pump is very...
  16. M

    Practical problem - fill 1000 liter water tank with pump using solar power

    Hi all. This is my first post so please forgive me if I write anything wrong or post on wrong forum. In the attachment below I have a problem. I need to buy a water pump (PUMPA in img) that works on 12 or 24 volt DC current being powered with solar panels. This pump must be able to fill a...
  17. P

    Branched suction pipe foR a pump

    A PUMP OF 0.25HP IS CONNECTED IN THE ABOVE FASHION (REF ATTACHMENT) TO THREE TANKS BY MEANS OF A SINGLE SUCTION PIPE. THE SINGLE SUCTION PIPE IS FURTHER BRANCHED TO THREE SUCTION PIPES, ONE EACH FOR THREE TANKS. THE DESIGN DISCHARGE CAPACITY OF THE PUMP IS APPROXIMATELY 45 LIT/MIN. BUT...
  18. G

    Hydraulic Pump Closing a Floodgate

    Homework Statement -4" hydraulic cylinder/piston -closing a floodgate 4" in diameter, must exert force F=30,000lb to do so. -Piston stroke is 2'. -Hydraulic fluid specific gravity of 0.9. -Pump efficiency of 0.8 Find A) the pressure on the floodgate and B) the horsepower of the pump...
  19. H

    Flow Rate in Tank 2: Same as Q /min?

    two tanks were placed. tank one at a higher level and other(tank 2) at lower level. But in tank 2 a pump of flow rate Q ml/min is affixed.what is the flow rate in tank 2. Same as Q /min?
  20. I

    What is the Efficiency of a Centrifugal Pump Used as a Turbine?

    Centrifugal pump as turbine! Dear Friends, Francis turbine and centrifugal pump has got the same (reverse ofcourse) technologies rt. Have they both got the same manufacturing criterion? will centrifugal pumb, if used as a turbine, have the same efficiency as that of francis turbine?
  21. D

    Measuring pressure across a centrifugal pump

    This should be an easy one but here goes... I am trying to easily measure flow rate in a pipe which has an in line centrifugal pump (Grundfos UPS 25-60) creating the head in the system. I have been told that installing a pressure gauge before and directly after the pump will give me system...
  22. K

    Side Stream Filters - preferential flow through side stream without using a pump

    Hi, I am trying to understand side stream filtration. Iv been finding it really hard to find out anything on preferential flow (multiphase) through a side stream using a valve to create a pressure drop (general info for my understanding) Im trying to do this without the need for a...
  23. B

    Selecting the Right Water Pump for 1500mm x 30m Hollow Pile

    I need to select a pump that will remove all the salt water from the inside of a hollow driven pile. The pile 1500mm diameter and is 30m in length probably containing around 20m sea water. does anyone have any ideas on how i go about choosing the right pump for the job? I have no experience...
  24. D

    Engineering Finding size of motor needed for pump

    1. Pump used to deliver water at 20oC from a pond to center of large field located 100 m from the pond. The desired pump is expected to deliver a max flow rate of 380 L/min through 107 m of a 6 cm steel pipe having an equivalent sand roughness of 0.01mm. Water level in pond during irrigation...
  25. I

    How much work is required to pump all of the water to the top?

    Consider the vessel. It is filled to a depth of 1 foot of water. Write an integral in terms of y (the distance from the bottom) for the work required to pump all the water to the top of the vessel. Water weights 62.4 lbs/ft3. Relevant Equations W = ∫F dx Pressure = density * g * depth F =...
  26. V

    Is there a difference between a car fuel pump and a water pump

    I am going crazy! These websites appear to contradict one another... The lowering of the diaphragm makes the inlet valve of the fuel pump open. With this valve open, fuel is drawn from the gas tank and into the pump. At the same time, the lowering of the diaphragm closes an outlet valve...
  27. E

    Pump Installation | College Days | Parallel vs Series

    in college days it is known that if you want double pressure install the pumps in series if you need double flow install the pumps parallel. but in actual field i have two pumps installed in parallel in Sewer Pump Station one as on duty and the second one is assist. but while both pumps running...
  28. D

    Flowrates in gravity system + piston pump

    Hi all I hope you can help me here. I am trying to model an elevated vat which is using gravity to supply water to a filler. The pipeline has filters and bends in it which lead to headlosses. The filler supplys a fixed volume of liquid to a bottle at set time intervals. The filler is...
  29. A

    What Are the Key Considerations in Designing a Peristaltic Pump?

    Hi Guys, Been researching peristaltic pumps, but can't find an industry standard in designing them. Wiki (http://en.wikipedia.org/wiki/Peristaltic_pump) has a little bit of maths on the occlusion, and a basic idea on calculating the flow rate and this article explains a little of the theory...
  30. T

    Pump water weight upward pressure needed

    I'm designing a bucket pump for a water well I'll be attaching a pumpjack to. I'm just a regular shop guy so I was kind of stumped on a question of how much upward pressure will be required to move the water up the drop pipe. If the pump cylinder is the same diameter of the drop pipe I figure...
  31. C

    Help with prototype, hooking up sensors and a pump to a circuit?

    Hello, I'm working on an invention in which I'm trying to build a prototype for. I have very little physics background and nothing in computers which is why I've sought help here. The project seems very basic, but I have no idea where to start. I need help hooking up two hygrometers...
  32. Femme_physics

    Hydraulics - System curve VS pump curve

    http://img849.imageshack.us/img849/9018/curvess.jpg So pump curve, as flow increases, pressure drops. For the system curve, it's the other way around. How come? How come the pump disobeys the way the system is supposed to behave? The pump is a part of the system, and in the physical world...
  33. C

    Calculating flow variables from a water pump

    The setup I have is a water pump, with a pipe out leading to a nozzle of some sort. I know the mass flow rate of the water through the pump, and wish to calculate the exit velocity of the water from the nozzle. Which other variables do I need to know? Also, what dictates the limit to the...
  34. W

    Centrafugal pump coeficients question

    Hi everyone. I am having a slight issue with part of a question regarding an experiment that i had to do as part of my course. Basically we were calculating the coeficients and characteristics of a basic centrafugal pump. We used the pump to pump water round a simple system and recorded the...
  35. J

    Does anyone make a small high temperature and high pressure pump?

    Hello, I have recently started work as a researcher at a university investigating heat transfer fluids (HTF). One of the tasks is to build a pumping test rig to simulate plant conditions. One of the fluids being tested is a eutectic mix of biphenyl and diphenyl oxide which is similar in density...
  36. T

    Work needed to pump water to a tank

    Homework Statement I have attached the question with a diagram and answer key. The Attempt at a Solution What I did was found the work needed to pump the water into the bottom half of the sphere from 90-100 and then add that to the work needed to pump the water into the top half of the...
  37. C

    COP refrigerator vs COP Heat Pump

    Homework Statement I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use Homework Equations [b]3. The Attempt at a Solution [/b} Uh I just trying 2 figure out the concept so Idk how 2...
  38. Femme_physics

    Entrance to centrifugal pump = pressure lost in entrance to container?

    Does the local pressure lost endured in an entrance to a container (k =1) equal to the same local pressure lost of an entrance to a hydraulic Centrifugal pump (in basic hydraulic with mostly ideal conditions - neglecting friction). Or do we ignore it as local pressure lost?
  39. C

    How to Mathematically Model a Single Vane Rotary Vacuum Pump?

    Hi all, I was recently given a project at my college intership where I am supposed to model a mechanical singe vane rotary vacuum pump mathematically. The objective of the analysis is to find the work required to run the pump and the resulting net loss of energy from the system. I was told...
  40. T

    Water feature design - pump mathmatics

    Hey everyone, as part of a university project working on renewable energy sources in the garden I am performing some simple fluid dynamics analysis to calculate the pump power needed to feature in this garden water feature. I have designed the schematics of the feature and worked out the...
  41. K

    Selecting Vacuum Pump for Microfluidics Device

    I'm doing work in microfluidics, and need help selecting a vacuum pump as I have no experience in creating or controlling a vacuum. Let me simplify my device: I have water confined between two plates. One of the plates has a hole, covered with a small patch of material that let's gas through...
  42. R

    Is it possible to pump a swing 360 degrees?

    Is it possible to "pump" a swing 360 degrees? Homework Statement Is it possible to "pump" a swing so that it turns in a complete circle? Assume if you wish that the seat of the swing is connected to its support by rigid rod rather than a rope or chain. Homework Equations Angular momentum...
  43. T

    A centrifugal pump at the source tank sends fluid 200m

    Hi, This is a question regarding my employment. A centrifugal pump at the source tank sends fluid 200m using 3" hoses to a recieval tank. When the automatic valve shuts on the recieval tank the pump stops due to it having a pressure sensor.When the pump stops there is 8 Bar pressure on...
  44. P

    Solving Heat Pump Problem: 1/W = 1/(1-5/20)

    Homework Statement If the temperature underground is 5 degrees Celsius and you'd like to keep the house at 20 degrees Celsius, how much work per joule leakage must be done to maintain the house at that temperature? Homework Equations Q/W = 1/(1-(Tc/Th)) The Attempt at a Solution I...
  45. S

    Two stage turbocharger heat pump.

    So, I've been thinking a lot on this lately. I want to use two turbochargers, one with just the compressor - and one with both compressor and turbine. Doing calculations at 10 deg C. Doing the math for Norway because commercially avatible evap heat exchangers doesn't really work well in our...
  46. K

    Pipe Design Problem (Diameter and Pump Determination)

    You are the Chief Engineer for a prominent hydraulics consulting company. Your client wants to pay you lots of money to design a system to deliver 1 m3/s from reservoir A at elevation 300 m to reservoir B at 500 m. The distance from A to B is 1000 km and the elevation between the two reservoirs...
  47. S

    Calculating COP of a Heat Pump in an Experiment

    Homework Statement I am trying to work out the Cop of a heat pump in an experiment, I recorded the temperatures before and after the Condenser, but am unsure of how to calculate the work input to the condenser Homework Equations cop= heat gained at the condenser/ work input to the...
  48. C

    Heat engine and Heat pump in combination

    Question is attached I have spent a great deal of time on this problem and I am hoping someone can help me out. My attempt at problem. first for the heat engine QL/Qw1 = TL/Twaste so efficiency = 1- Tl/Twaste efficiency = 0.93808 and I know that efficiency = Wout/ Qw1 This is as...
  49. J

    Work required to pump water out of a conical tank

    Homework Statement Find the work required to empty a 10m high conical tank with a radius at the top of 4m by pumping the water out the top of the tank. The water level is 2m below the top of the tank. Homework Equations \pi r^2 Similar triangles The Attempt at a Solution...
  50. H

    Calculating Power of Pump to Remove Water from Basement

    Homework Statement Water is pumped steadily out of a flooded basement at a speed of 5.5 m/s through a uniform hose of radius 1.0 cm. The hose passes out through a window to a street ditch 2.8 m above the waterline. What is the power of the pump? Homework Equations .. The Attempt at a...
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