Pumps Definition and 114 Threads

why is it recommended to use a 1450 rpm pump with a bronze impeller for pumping chilled water to the chillers ?

OK needs some help here and I'm not sure how to accomplish this. Basically i have 2 pumps (fill and drain), a resevoir and a bucket. What i want to happen is that i want to fill the bucket from the resevoir up to a point and then as soon as it reaches that point turn the fill pump off and...

Hey guys I am working on stress analysis for a pipeline and I need information on one of the pumps on site ,Gorman Rupp type 06B3-B type… For that I need to find allowable nozzle end loads as per design code used on these pumps. I cannot seem to get through to the technical guys at Gorman...

Hey, I know this is pretty random, but I have a few questions about heat pumps. Does the refrigerant run out or is it circulated over and over again? Also, how does the compressor play into it? I know this is a simple question that will get simple answers, but if anyone knows anything, leave a post.

Hi everybody. I'm studying this kind of pumps right now but I'm finding a few difficulties trying to understand how it works... First of all i know it needs to be filled with oil, right?but totally or partially filled? When we start the pump the rotor starts spinning so it starts to evacuate...

In my thermodynamics class we're talking about heat pumps (i.e. refrigerators and such). When talking about a typical heat engine (carnot or not) it makes sense to me to talk about the efficiency of the engine η=1-\frac{Q_{l}}{Q_{h}}, because it clearly represents how much bang you get for you...

Fluid Mechanics Question -- Pipes and Pumps Homework Statement Design a system to deliver 1 m^{3}/s of water from reservoir A at elevation 300m to reservoir B at 500m. The distance from A to B is 1000km (1000,000m) and the elevation between the two reservoirs can be approximated as...

I have a friend who insists in an idea and I want to prove to him that it cannot work because it would violate basic physical laws. But somehow I don't find the right words. He says if he drilled a well of 2km (or any other depth) into the Earth and at the bottom there was a pump that...

I have a pump that puts out 396 gal/hr of water. The output pipe on the pump is 9/16 inch in diameter. Is there a way to calculate the psi?

Hi Folks, I tried designing a Dickson's charge pump. Here are the below observations: For a voltage doubler: When W=240nm, charge pump capacitance= load capacitance= 1p F, load resistance= 10M ohm, Switching frequency=500k Hz, Vin=2V Results: Vout= 4.3772V, settling time= 50u s...

Do any of you know if the backup water pumps have been upgraded at the Byron NGS? Also, is the plant currently using the main cooling pumps, or the backup pumps? Last year after the Fukushima triple meltdown, the NRC told the Exelon that the backup cooling pumps at Byron were too small...

Hi everyone, I have been messing around studying Hydraulics on my own, but I can't get round something. The following things are things I concluded after reading books, sites, ... - The pump itself doesn't generate pressure, but when there is a resistance in the circuit, there is pressure...

Homework Statement A hydraulic can crusher is shown in the figure. The large piston has an area of 8m2 and exerts a force F2 of magnitude 2x106 N on the cans. Calculate the magnitude of the force F1 exerted by the small piston (area 10cm2) on the fluid. Do not ignore that the large pistons...

I have read somewhere about "jogging/jog" of pumps .Is it something to do with starting of a pump?

I was working on making a small dispensing machine for tea for a sort of extra-curricular competition and including a small pumping system for quick discharge of milk and water. I have seen some machines exist before that dispense tea, coffee etc. What small pumps do they use ? It's surely not...

Hello, Just wondering if you could help me out with this question; A house is to be maintained at 20°C in winter and the heating load is 10kW. The outside temperature is -5°C. If a heat pump is to be used to heat the house, what is the minimum power required to drive the heat pump...

could you explain me the working of a heat pump or a refrigerator

Stuff like osciolloscopes, vacuum pumps, plumbing/tubes/joints, soldering guns, etc. that it would be nice, cause it takes some time to find all these manuals, and filter the information... *instruction manuals (in title)

Hi PF! I have a question regarding the use of centrifugal pumps. I have a system with a constant flowrate of water at 2m^3/s pumping water from a lower to a higher reservoir. The inlet condition is a head of 10m. The Height of the upper reservoir will vary from 83m in the beginning to 287m...

centrifugal pumps and blowers work on the same principal then why centrifugal pumps are needed to be primed but blowers are not?

A Carnot engine uses hot and cold reservoirs that have temperatures of 1684 and 842 K, respectively. The input heat for this engine is |QH|. The work delivered by the engine is used to operate a Carnot heat pump. The pump removes heat from the 842-K reservoir and puts it into a hot reservoir at...

A Carnot engine uses hot and cold reservoirs that have temperatures of 1684 and 842 K, respectively. The input heat for this engine is |QH|. The work delivered by the engine is used to operate a Carnot heat pump. The pump removes heat from the 842-K reservoir and puts it into a hot reservoir...

I am new here and I am not really sure where to post this question. I am also not an Engineer, so general language would be appreciated. I sell Water Well Pumps at my location and on the Internet among other things. Today I had a call from a Man who wanted a Pump that was going to Africa. He...

Does anybody know where I can find the general efficiency of reciprocating pump?

I recently saw a video of a man igniting fuel when he used his mobile at a petrol pump. What's the likelihood of something like that happening? Could it be that there was another reason why the fuel ignited? How could a mobile phone cause such a reaction?

Hello, I was hoping for some information on vacuum systems. There are two side channel blowers that produce -8kPa of pressure on the inlet. The outlet pressure in roughly the same. The two blowers are connected in series. Can some please refer me to some reading material so that I...

This question has been in the back of my mind for a while. In short, is having a phase change between liquid and vapor more desirable for a heat engine or for a heat pump? Clearly, having a large area enclosed by the loop in a P-V diagram increased the amount of work in the cycle, so...

I have been recently trying to advance my understanding of thermodynamics, but i have encountered a problem when it comes to absorption heat pumps and similar systems. The standard heat pump requires an energy input, to move heat energy from one location to another. Most would consider...

2 identical parallel centrifugal pumps ? hello everyone i have a very confusing problem with a cold water system sonsists of 2 identical centrifugal pumps their position is under the tank so there is always a +ve suction head then those pumps takes water from the tank and deliver it to a very...

So I wrote my Thermodynamics final today and one of the questions were as follows: A reversible heat engine supplies a reversible heat pump. Both draw off of a temperature reservoir T (can't remember the exact value, but there was one). The heat engine discharges heat into TL, and the heat...

Hey. At the moment, for my fluid mechanics course, i am working on an assignment where i have been instructed to design a basic fluid system which involves the use of an operating centrifugal pump. The system i have chosen is a pool circulation and filtration system. I have finished with...

"Electromagnetic pumping is a non-invasive method of moving liquid used in situations where the moving parts of traditional pump are not practical. Pumping liquid metal is an example. Electromagnetic pumping involves applying an electric field and a magnetic field at the same time. Consider a...

Can any dry pump be reused for evacuating a chamber? Ie: I have a 2hp compressor, can I use it to make a vacuum chamber. -lamonster

Hello everyone, i had one doubt in my mind regarding Rotary oil pump. The Question is what would happen if we remove oil from the Rotary oil pump. What would be its effects? Please Reply Regards Gagan Sharma :confused:

Homework Statement I have to design a pumping system. Its for a swimming pool. The pool has various fittings (valves, etc) and pipe lengths. My problem is I cannot find an appropriate K value for the filter and sieve. On the suction side of the pump is various valves and a sieve to...

Hello I have a question please i am not sure about. I work with this machine as a operator but would like to learn more. 1. I have attached a picture of a juice separator tank. The juice enters the separator where the liquid goes to the bottom of the tank and the vapour rises to the top...

I am working on a new 45kW centrifugal water pump, which is >70C at the roller bearing pedestal. I wonder what' s causing such high temperature. The vibration measured at the bearing pedestal is indeed very small. The pump seems to be well balanced and lubricated.

Help me out on the working of piston pumps! Hi There, I m searching some information on working of http://www.arnorthamerica.com" and its mechanical characteristic please some one help me out on the same ! Regards Odoury.

Hi! This is about electrosmotic micropumps. I don't understand why there is always a reservoir and what is the point of this reservoir on the pumps? Can someone explain it to me? thank you!

Right, I am in the process of designing an axial piston pump. I have obtained the following formula from a textbook for power output. unfortunately i don't know what units the formula requires, is anyone able to confirm what they are? Also, if anyone knows of a good resource for pump design...

Hello all. Does anyone know of a common failure mechanism for submersible pumps whereby they trip household Residual Current Devices. I have had the same problem with three such pumps. I assume the problem is not the fact that they are inductive loads (I assume that they are inductive loads)...

Homework Statement A heat pump operates as an air conditioner, drawing 20000 Btu per hr from a building. It is operating between 21 degrees Celsius and 41 degrees Celsius. a) If the COP (coefficient of performance) is 35% that of a Carnot air conditioner, what is the value of the effective...

http://images1f.snapfish.com/232323232%7Ffp934%3Enu%3D333%3A%3E23%3A%3E2%3B7%3EWSNRCG%3D323%3A76%3C89%3B698nu0mrj check on the link above , it is my workings on spreadsheet and data given . basic : i am being told , that two centrifugal pumps , diameter given , speed given , are pumping...

Hi all, I want to know the details of the pumps such as Which of the pump has the highest head? Which one has the Highest Discharge? The one highly recommended for lubrication oils? What is the real physical meaning of head? The relation between Head and Discharge in physical...

I’m a Spanish student and I have to translate a text about pumps. Since I’m not an expert in the subject and I haven’t found any useful English text about it, I would like you to help me clarify some concepts about steam or gas pressure pumps. The text says that the operation of the inert gas...

Okay, if the cell's cytoplasm has a net ionization charge of -1 (efflux of 3 Na+; influx of 2 K+), then why doesn't it just do a net efflux of a positively charged ion to maintain it for sake of osmotic balance? Well hm, it needs to efflux those ions SOMEHOW, But there aren't a lot of reactions...

How do I determine NPIPA and NPIPR for PD oil pumps. I understand from limited research that suction condition is critical to the success of each application, but I do not know the formulas.

How is it that engineers determine the best pumps to be used for let's say, an arrogation system? Given that you have a system with specific requirements for flow rate and pressure, how is it that one can determine the best pump for the application given just its set of non-dimensional...

Homework Statement Hi guys, I've been working on some problems at uni to try and get to know this subject better and i have been unable to answer a question. the impellar of a centrifugel pump has the following configaration, diameter 254 (hence r2=127) blade exit angle (Beta) 32degrees...

I was reading on the Clausius statement and heat pumps. Apparently, the COP (coefficient of performance) for heat pumps can be greater than unity (1), and it usually is for several systems (depending on the conditions). So the energy transfer due to work done on the system results in a greater...