Pump Definition and 621 Threads

  1. 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...
  2. 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...
  3. 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)...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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?
  10. 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?
  11. 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...
  12. 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...
  13. 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...
  14. 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 =...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. 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...
  24. 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...
  25. 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?
  26. 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...
  27. 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...
  28. 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...
  29. 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...
  30. 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...
  31. 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...
  32. 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...
  33. 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...
  34. 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...
  35. 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...
  36. 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...
  37. A

    Water pump design of an engine?

    Hey all, So I'm trying to figure out a design for an engine that will fit in a rectangle space, longer horizontally than vertically, so I thought of a water pump. A water pump is a blade that channels one stream of water into another channel. Picture: So then I thought why can't I do the...
  38. Spinnor

    Basement sump pump liner install, back-fill with concrete?

    I will install a sump pump liner and will dig a hole near a stone wall foundation. My concern is that the hole might weaken the foundation a bit. I have insurance for such things but want to take no chances. If I back fill the space around the sump pump liner with concrete then any effects of...
  39. M

    Pump Selection: Manual vs. Existing Pump

    accordin to my last to posts here i found this special pump which has materials designed to carry a high press but the problem now i found a pump on the machine is bigger than the one in the manual so shall i buy the pump from manual or as the existing pump ?
  40. K

    Efficient Heat Pump Calculation for 15,000kWh Heat Output

    A heat pump that used R-22 operates as shown below. Assume SEER=1.15*EER. Find the amount of work that has to be put into the system to generate 15,000kwh of heat energy.
  41. F

    How Much Energy Does a Refrigerator Use in a Single Day?

    Homework Statement A freezer has a coefficient of performance of 6.30. It is advertised as using electricity at a rate of 457kWh/yr. a)On average how much energy does it use in a single day? b) What maximum mass of water at 20.0 degree celsius could the freezer freeze in a single day...
  42. K

    Best vac pump for boiling water

    Hello all, I am seeking advice on the best, relatively cheap vacuum pump to pump water vapor from the 2 kPa range to the 100 kPa range. Essentially any pump that would work well at boiling water at room temperature would work for me. I'm hoping that someone on here may have done that as a...
  43. D

    Force due to a submersible water pump to move an underwater vehicle

    Homework Statement I'm trying to find the force exerted by a 500 GPH (gallons per hour) submersible bilge pump. My team is designing a submersible vehicle for our university course. The vehicle is only supposed to move up and down in the vertical direction; basically it should just be able...
  44. M

    Pump Selection for Hms and Hmd - What's the Difference?

    tell me guys what's the relation between Hms and Hmd and the pump selection for example i have Hms =10bar , Hmd =12 bars so Hm =2 bars so the Head of the pump is only 2 bars or its said that pump has a head of 2 bars and can withstand 12bars ?
  45. M

    Selecting a Centrifugal Pump for High Pressure Circulation in a Closed System

    [SIZE="4"]dear guys how are u ?? i ve a problem with selecting a centrifugal pump for circulating water in a closed system this system consists of tank , pipes up to 60 meters with 2 inch dia , then these pipes deliver water to a tube contains pressurized nitrogen @ 10 bars then return back...
  46. L

    An electric pump raise 9.1m^3 of water from a reservoir

    1. An electric pump raise 9.1m^3 of water from a reservoir whose water-level is 4m below ground level to a storage tank above ground. If the discharge pipe outlet is 32m above ground and the operation takes 1hour,find the minimum power rating of the pump if it's...
  47. Low-Q

    How does the centrifugal and coriolis forces affect a centrifugal pump?

    When a centrifugal pump is running, how much energy is required to fight against the coriolis force of the spinning water mass that flows from center toward the circumference? I have done some simple experiments with a tube. The tube have a water inlet in the middle of its length, so the open...
  48. D

    Why Does Pump Head Decrease with Constant Velocity?

    Hi Folks; I am facing a problem with a real experimental pumping case. I am running a schedule 40, commercial steel, 45m length, 2" diameter pipeline for water. Since past month, suddenly, the head of the pumped dropped by 0.3 Kpa/m, however, the velocities are the same. I wonder is it...
  49. B

    Derivation of formula for pump power

    Hi I was given the following formula for to calculate the power of a centrifugal pump: P = ρ * g * Q * H i.e. Power = Density * acceleration due to gravity * volumetric flow rate * total head I have found websites that state this formula but I haven't been able to find anywhere that...
  50. B

    Selecting the Right Vacuum Pump for a 2 Lit Container

    the pressure inside a 2 lit container has to be maintained at 0.01 bar. For this purpose, a vacuum pump will be used to pump the air outside. Also, air from atmosphere is leaking back into the container at 1 lit/min. one of the following pumps has to be selected. A. pumps out 10 lit/min...
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