If you are dumping lower that the pump discharge, there will be a gain in energy, the static head will be negative instead of positive. The total head of the...
297
alrehmat
alrehmat.net...
Jul 5, 2012 12:10 pm
298
briangrenier2
briangrenier2@...
Jul 5, 2012 12:10 pm
1. So the dump side would need to be lower than pump side for a gain? 2. Would static head be subtracted from total head to the extent that the discharge pipe...
299
briangrenier2
briangrenier2@...
Jul 6, 2012 12:56 am
Is this true even if the pump is submersed? Would the negative static head gain only be true to the portion that the discharge is above the water level?...
300
Jacques
jchaurette
Jul 6, 2012 9:19 pm
Not sure what you mean in no. 2, if the staic head is very high negatively this could mean that you do not need a pump and gravity can do all the work for you....
301
Jacques
jchaurette
Jul 6, 2012 9:19 pm
I'm sorry, I lost the thread here, can you re-phrase the question and put a little more background info into it? Jacques...
302
Jacques
jchaurette
Jul 6, 2012 9:19 pm
I am sorry, you are asking for way too much information. Do yourself a favor, go to pumpfundamentals.com, download everything that is pertinent, analyze it and...
303
briangrenier2
briangrenier2@...
Jul 8, 2012 12:43 am
I am not sure about the negative static head below the water level in this open loop pumping scenario: Depth to water = zero Depth to submersible pump from...
304
Jacques
jchaurette
Jul 8, 2012 12:50 am
The static head has to calculated based on the level of the discharge lake or tank fluid surface. It does not matter how deep the pipe discharge end is. ...
305
Jane E. Thompson ~ In...
bluejeansbbyg@...
Jul 11, 2012 3:51 pm
My spa that I am building from scratch runs 1.5" flex. The Balboa pump and Spak Pak that I am interested in purchasing are 2" at the intake and discharge...
306
Jacques
jchaurette
Jul 11, 2012 5:39 pm
Hey bluejeans, I don't think you need worry, there will be an additional pressure drop due to the reducer which will decrease the flow slightly. On the suction...
307
siroos tahery
siroos_tahery
Jul 12, 2012 1:16 pm
Dear Jane As long as you you can tolerate less flow in your building , reducing the suction and discharge of the pump by 0.5" does not make any difficulty for ...
308
fahadr
fahad_2_0
Jul 26, 2012 7:21 pm
where specifically are foot valves installed?are they intrinsic to vertical inline pumps? how can they be responsible for air lock in the suction line?in what ...
309
Jacques
jchaurette
Jul 26, 2012 7:25 pm
They are typically installed on horizontal pumps that have a suction line going downward into a sump for example. They are located at the tank end of the...
310
fahadr
fahad_2_0
Jul 27, 2012 8:10 pm
yes sir but how do they work?any animation you got?what are its types?.and how do they get OUT of ORDER?what specifically goes wrong in them?arent they EXACTLY...
311
Jacques
jchaurette
Jul 27, 2012 8:23 pm
Just google foot valve, you will see many, should be some on my web site also. They have the same function as a check valve and are normally the same size as...
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Jacques
jchaurette
Jul 27, 2012 8:34 pm
You have uploaded a picture of the pumps. I see the suction is going through the floor, no doubt these are the pumps with the foot valve. These pumps seem to...
313
Jacques
jchaurette
Jul 27, 2012 8:46 pm
I think if you had a pressure (positive and negative pressure capability) gauge installed on the suction side of the pump you would be able to determine...
314
fahadr
fahad_2_0
Jul 28, 2012 11:28 pm
hello...the problem arose when we received a compaint from the offices of a building of unavailibility of water.we rushed to this pump room and found the 1st...
315
Jacques
jchaurette
Jul 28, 2012 11:35 pm
The foot valve is intended to stop water from getting out of the suction pipe when the pump is shut off. Not to stop air from getting into the suction pipe...
316
Jacques
jchaurette
Jul 30, 2012 5:12 pm
Hello everyone, has anyone done any android apps out there? I am planning to start a few, beginning with something simple like a calculator that gives head vs....
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Jacques
jchaurette
Jul 30, 2012 5:44 pm
Heres' another couple of apps that might be interesting. 1. Pipe size calculation based on velocity. We know what the typical speed for fluid flow should be on...
318
Jacques
jchaurette
Jul 30, 2012 6:51 pm
Something else you may want to check is the amount of submergence avaible from the entrance of the check valve to the liquid surface, if insufficient you will...
319
Jacques
jchaurette
Jul 30, 2012 7:04 pm
Ok, so these 5 apps will be packaged together as a suite: 1. Head to pressure 2. Pipe diameter vs. flow 3. Submergence height vs. flow and diameter 4. pump...
320
Jacques
jchaurette
Aug 17, 2012 5:33 pm
Hello everyone, I am writing a new article on pressure, its various forms and consequences. The topics will be: 1. The definition of pressure and how the weigh...
321
Victor Dragono
dragon_vic
Aug 18, 2012 3:15 am
Dear Jaquess, I do believe those article would be useful for everyone. Can't wait to read it. Thank you Best regards, Victor Dragono 081802057241 ... From:...
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Jacques
jchaurette
Aug 18, 2012 3:27 am
Great, it's coming soon. Jacques...
323
Anandh
rakanandhan1979
Aug 18, 2012 4:38 am
Great. Sent from my iPhone...
324
Jacques
jchaurette
Aug 18, 2012 7:07 pm
OK so here it is: http://www.pumpfundamentals.com/pressure.htm <http://www.pumpfundamentals.com/pressure.htm> It's still a bit rough and I know I have some...
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Jacques
jchaurette
Aug 20, 2012 6:42 pm
For those of you not following this particular thread this is just to let you know that this set of articles on pressure and its many facets is ready: ...
