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#1
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#2
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If you folks are still in doubt just try playing around with that calculator on RC, link posted above. You will see that increasing the pipe size can dramatically decrease head pressure depending on flow rate and never will head pressure increase due to a larger pipe size.
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#3
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This is the same principle for powerheads which an impeller produces less gph, but more pressure, and a propeller produces more gph, but less pressure. How a MJ1200 with 198 gph will blow the flesh off certain corals placed 4" away where a Koralia 1 with 800 gph won't. |
#4
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I agree with you.....but that is something different ......your putting the same volume through a smaller pipe....which increases pressure...
I thought we were just talking about head pressure ??????? |
#5
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[quote=Myka;400466]A person will get less gph, but more psi at the end of a 1" pipe than using the same pump on a 3" pipe.
QUOTE] Put a pressure gauge at the end of each pipe and it will be the same. |
#6
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I can see where I got screwed up. The volume increases in the larger pipe. and pump only displaces a certian amount of water. Ya the larger pipe will not add anything to head pressure. Like the difference in a drain. Take a 40g tank, and a 140g tank, both of same height. Drill a 1" hole and install a bulkhead in it. Think of the tank as the larger pipe. more volume, right. Which would have more pressure at the 1" bulkhead? Neither
I was kinda thinking backwards in my previous post. It doesnt matter how large the pipe is, the pump is only pushing put it's amount of water, regardless. When working on gravity, water falling down a pipe, then the PSI gains as the pipe narrows due to the velocity of the water, not just head pressure.. Principal behind Hydraulic strip mining
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Dan Pesonen Umm, a tank or 5 |
#7
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No it won't be. The pump will be restricted by the decreased flow out of the end of the pipe...the same reason fittings on a pipe decrease pressure. Now, if you close the end of the pipe you would be right.
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#8
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I think you're getting confused. Decreasing the pipe diameter will increase back pressure at the pump, but I don't think you can use it to increase PSI at the outlet that way. Think of the applications for that kind of technology Perhaps you're thinking of velocity? I'm not sure what that has to do with head pressure though, which is influenced by gravity, not a pump.
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#9
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We use say 1200 psi to go through a 5/8" hose then through a 1/8" fitting on the end (we use this on Hydro-Vac trucks to cut the ground), and voila! It will cut your toes off. If we use 1200 psi pumped through a 3" hose (which you would never be able to hang onto, and you'd need a muuuuuuuch bigger pump to get 1200 psi out the end of a 3" hose), and you wouldn't hurt your toes with it. So...slap your fancy words (pressure, head pressure, velocity, psi, flow, whateeeever) on that equation, and tell me what the heck you mean that I am wrong. |
#10
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