PUMPMAN welcomes any question about PUMPS

Wow, Giza, what a place to live. You are right in the middle of some great history. First a pump question, have you encountered a multi-stage system where flow from the first stage, a centrifugal, drives a positive displacement second stage to achieve final system pressure? This is just for small, household or small industry situations.

The second question, is: has anyone considered investigating under the foot of the Sphinx. The chatter here is a chamber has been detected deep underground. Of course the curiosity is overwhelming.

Dear Friend,

Thank you for interest to chat with me

As for your PUMP question:

There is no practically such a system where a centrifugal pump makes a single stage for a positive displacement pump. Thioritically speaking, yes, it could be done, providing that both pumps have same flow rate. Yet, It does not happen like this

The most propable combination is that a Positive displacement pump may work as a single stage just to prime a centrifugal pump then it is stepped out of the system either manually or automatically to leeve the Centrifugal pump doing the work alone after being primed

As for household system, usually both the demand = Flow Rate, and the System head = pressure are so much moderate that there is no need for such a complicated system

We usually use either a single centrifugal pump, or a duplex centrifugal pump system where the second pump comes to work in paralel when demand asks for it

As for the SPHINX, yes, there have been always a lot of research around,within the area and inside the pyramids, including of coarse the Sphinx itself.

Yet, frankly there is no such a room under the foot of the sphinx. You can`t imagine the weight of his foot. However, there are a lot of secret rooms around used to be for sheltering of Labor leaders, engineers and guards worked at the pyramids.

As for the "PIMP", yes, it was a mistake, made in a rapid typing with a desturbed mind and week eyes of an ill man, who used to work even when is ill.

I am not sorry for that mistake, because it makes it more clear for me: who is serious and who is - - - - , well I do not like to write another "mistake"

You are most welcomed to ask any question either about PUMPS or about PYRAMIDS

Thank you

PUMPMAN

Thanks for the reply. I didn't correctly describe my pump configuration. Actually, it's just an idea I had, after having to wait so many times for a centrifugal to come up to the last few pounds of pressure to actuate the pressure switch. My idea is a tee off the centrifugal goes to a vane motor, which has a common shaft to a vane pump. The vane pump takes its feed from the tee also. The exhaust from the vane motor goes back to the suction of the centrifugal. A few checks here and there should keep things in order. The function is the centrifugal has good flow and performance at the lower pressures, but tends to stall if the pressure setting is a little high, and centrifugals drop performance as they wear. As the centrifugal stalls, flow increases through the vane motor and it comes into play to drive the vane pump to get the last five pounds of pressure, which is easy for a positive displacement pump.

I know this may seem like a lot of overengineering, but in these days of energy conservation, a shorter run cycle will save electricity. Also, this configuration would be capable of pressures much higher than the centrifugal alone.

On to the next question. This chamber is supposed to be very deep, forty or more feet down. It was supposed to have been found by ground penetrating radar.

And: isn't the breaking of the nose on a statue supposed to be some kind of insult? It's just a shame that art that could last for a millenium or more is defaced and we all are deprived of its beauty because some individual was upset? Not even to mention thoughtless soldiers blasting away at everything they see just for drunken fun.

Dear Friend,

Again I thank you for trusting me with your pumping idea.

What you have tell in your comment is not practically applicable and it will not save power as you may think, Plumbing and manifold to connect the two pumps in one system may consume a more lot of power than you can think, and all of this to get 5 pounds of pressure !!!. that is over engineering indeed.

We usually do not think of a positive displacement pump unless we are talking about at least 100 PSI. As for wear and tear, well, we can say calmly that the rate of wear and deterioration of any centrifugal pump is trifle compared to that may happen at any positive displacement pump including the vane type providing that both are running at same rpm and for same duty point and boundary conditions.

By the way, what is the duty point and service for the pump you need?

I can help selecting a pump for you

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As for the SPHINX:

A- To my knowledge, there is no such a room down the feet of the great statue even at such a depth. Also, Why the ancients need to dig below that over weighted statue to make a room while they have the desert vast around it

B- Situation is different when talking about the PYRAMIDS. There are a lot of secret rooms inside and even below the PYRAMIDS, to serve as sacred shelters for treasures or important secrets or for ritual purposes.

C- SPHINX nose has been destroyed by NABOLION BONABERT who had lead the French Campaign to EGYPT about 600 years ago, I am not sure exactly.

He took the great statue as a target for training his artillery and a lot of bombs had damaged the face and caused the ceremonial chin to drop down from the statue. Now It is shown at the Louvre museum in FRANCE.

Recently the Uprise of the underground water table causes a sever damage to the great statue made by the ancient Engineer and Prime minister EMHOTOB for his great PHAROH : MENKAU-RAA, the builder of the second pyramid

Continuous repairing efforts and remedies are taking care of the statue to reserve it and keep it for all humanity to tell how great were the ANCIENT EGYPTIANS

Please send me your private e-mail address and I shall send to you some PHOTOS

You should read the Mechanical Engineering section of CR4. There are several pump questions there right now that you have not contributed to...

Dear Steve.

MERRY CHRISTMAS and HAPPY NEW YEAR

Thank you for your valuable advice which I apreciate and will follow as much as I can

PUMPMAN