How to Classify Pumps?

http://www.engineeringtoolbox.com/classification-pumps-d_55.html

Your terse, disrespectful reply indicates that you know nothing, about pumps or manners.

I don't think his reply was at all disrespectful. SolarEagle's reply, while it had some basic points regarding the two classes of pumps, contributed little or nothing towards answering his question.

And, what has your reply contributed?

At this point we can only assume that you know nothing about pumps, either.

For centrifugal end suction pumps,how many types of impellers(name,picture) are available & out of which is the most efficient.

You can't Google, either?

Types of pump impellers - YouTube

Thanks.Have they identified the most efficient one?.

Have you looked at the video?

Have you a reason for asking?

Do you have an opinion about the video?

Do you have an opinion about what type of impeller might be most efficient?

Yes. Video is good but unable to read text(too small) in pump curves.

Please give meaning to symbols(c,v,w etc-d1,d2 ok).

Classification is a very broad word and you can classify to what ever end you need it.

I classify pumps from can "carry" to "cannot carry by hand any more" to " nobody can carry by hand" to "big pump" "very big pump" and "does not exists but everybody wants its"

Check this out to have some more definitions.

For the last question I would rather say: a fixed displacment pump is always a positive displacement pump.

There are 10 kinds of pumps. Those that work, and those that don't.

(That's the binary law of pump classification.)

1. General circulation
2. Restricted circulation
3. Top secret--burn after reading

Of the choices given, the first is best. However, better still is to state the actual pump type in question; e.g., centrifugal, regenerative turbine, gear, piston, vane, progressive cavity, diaphragm, peristaltic, etc.

Although you are VERY impolite I shall give you a general way to do it:

First you use the basic parameters of a pump i.e. Flow and Pressure.

Second the physical principle : volumetric or centrifugal

Third you use the design : fixed, variable,piston, screw a.s.o.

In fact the principle and design are related to the range Q&P. There are as well more scientific basic criteria but due to your lack of knowledge mentioning them will fly too high for you.

Green ones and red ones?

You forgot the blue ones. They are much better than green and red together.

I never seen an orange one. And do they not do the reverse flow negative suction pumps with modulator spray top anymore that can vary in size dependend on how long you look at them?

Bugger there was just a brown pump jumping across the lawn. . .

Every pump has the potential to be variable.. you need to be exact in what you need to know!

As for classification..... it's a pump, only variable is, how it pumps! What would be more interesting would be for you to explain your understanding of the classifications and how the types you list, work!

Then, maybe we can fill in the holes in your education.. or perhaps point you in the right direction

Please elaborate on varieties of centrifugal & special effects types of pumps.

a centrifugal pump is just that.. a centrifugal pump! there are no varieties or different flavours.

LINK

There are various impeller types (open, closed) and features (e.g., cutter teeth).

Other roto-dynamics include regenerative turbine, for instance.

Fine.

Dear Mr.islam.aboauf,

Pl. open the link below and you will have good amount of Information and I am sure - you will be satisfied with the details available in the link.

http://in.grundfos.com/content/dam/Global%20Site/Industries%20&%20solutions/Industry/pdf/Pump_handbook.pdf

DHAYANANDHAN.S

GlobalSpec classifies pumps both by technology and application:

http://www.globalspec.com/productfinder/flow_transfer_control/pumps

Islam.Aboauf, I will try to answer your questions in the same order that you asked them.

1. is it correct to classify it as : positive displacement pumps and roto-dynamic pumps

Yes, these are two basic pump classifications.

Positive displacement pump traps fixed volume of fluid from suction inlet and moves it to discharge outlet. Then the cycle repeats. Pump capacity stays nearly constant as discharge pressure changes. Example: reciprocating piston pump.

Rotodynamic pump continuously imparts kinetic energy to fluid by means of rotating impeller or propeller. This energy will cause the fluid to flow. Pump capacity decreases as discharge pressure increases and may even go to zero. Example: centrifugal pump.

2. or it should be as : fixed displacement pumps and variable displacement pumps?

No. A positive displacement pump may have fixed or variable displacement. Variable displacement pump changes the volume of fluid that is trapped and discharged. It is usually more complex than a fixed displacement pump. Example: piston pump with variable stroke length.

3. also are the positive displacement pumps always a fixed displacement pumps?

From the answer to question #2, a positive displacement pump may have fixed or variable displacement. So this answer is also "No."

Good luck and all the best!

Also, #3 is sometimes referred to as dosing, or metering, pumps.

http://www.globalspec.com/learnmore/flow_transfer_control/pumps/pumps_all_types