Boat/Ship engines/cooling system.
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From: chuckcar on 8 May 2010 09:51 "hls" <hls(a)nospam.nix> wrote in news:KvCdnamBpIUpwHjWnZ2dnUVZ_sqdnZ2d(a)giganews.com: > > "Pete C." <aux3.DOH.4(a)snet.net> wrote in message news:4be4c341$0$16324 >> The suction lift is measured from the surface of the liquid to the >> pump, the amount of pipe under the surface of the liquid has no >> bearing on the suction lift as the liquid pressures are balanced >> regardless of that depth. The length of the subsurface pipe is only >> relevant to frictional velocity losses. > > Quite correct, and I should have mentioned this. I was just going > after his 30 foot statement. > Which only applies if they don't have a pump at the bottom as I thought I made clear, but perhaps there was some vagueness there. > > I dont know what they plan to do with the oil they evacuate from this > leaking system anyway. If they have to pump into a tanker that might > present lift heights greater than some 10 meters, then they would > still have to use a positive displacement pump. Since they would be > lifting oil, with a lower density than water, the 30 foot rule of > thumb would be somewhat higher. > Surely the initial pressure forcing out in the first place would help this. Otherwise they could never get it to the surface in the first place and an oil well would be completely pointless as you couldn't get any oil. My point was that the oil pressure at the ocean floor would be more than at the surface. -- (setq (chuck nil) car(chuck) )
From: cuhulin on 8 May 2010 12:05 What are we dumping into the Gulf to fix the oil spill? http://www.grist.org Some kind of super secret soap? cuhulin
From: hls on 8 May 2010 12:10 "chuckcar" <chuck(a)nil.car> wrote in message >> But the fact is that this type of pump is not at all used in this sort >> of installation. >> >> Subsea electrical submersible pumps (or similar) can pump against many >> hundreds or thousands of pounds of pressure, at very high delivery >> rates. >> > *And* counteract 5,000 feet of oil with gravity working on it as well? Of course. Many wells will not flow naturally. The downhole pressure is just not high enough to pressure oil/water out of the well. In such a case, you have to pump the oil out. On shore, the traditional "pump jack" may be used, with "sucker rods" going down the production tubing and activating the downhole mechanical pump. If you really want to move some fluid from a formation that has little pressure, electrical centrifugal pumps can be used. They can pump hundreds or thousands of barrels per day.
From: hls on 8 May 2010 12:18 "chuckcar" <chuck(a)nil.car> wrote in message news:Xns9D7263325FE6Fchuck(a)127.0.0.1... > "hls" <hls(a)nospam.nix> wrote in > news:KvCdnamBpIUpwHjWnZ2dnUVZ_sqdnZ2d(a)giganews.com: > >> >> "Pete C." <aux3.DOH.4(a)snet.net> wrote in message news:4be4c341$0$16324 >>> The suction lift is measured from the surface of the liquid to the >>> pump, the amount of pipe under the surface of the liquid has no >>> bearing on the suction lift as the liquid pressures are balanced >>> regardless of that depth. The length of the subsurface pipe is only >>> relevant to frictional velocity losses. >> >> Quite correct, and I should have mentioned this. I was just going >> after his 30 foot statement. >> That 30 foot statement only applies if your pump is one that operates on reduction of atmospheric pressure. Those types of pumps can only lift a column of fluid which has a pressure of atmospheric or less. But, you could do it in stages, of course. Several stations at 30 foot intervals and you can be over a small mountain.
From: Paul on 8 May 2010 13:30
chuckcar wrote: >> > *And* counteract 5,000 feet of oil with gravity working on it as well? Oil is less dense than water. It floats on water. The counteracting force will be the denser water. |