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#1
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Flow rate vs. pipe diameter
This was originally posted by Rob Farlee in RP:
The links do longer work, perhaps someone knows of a good one we could use? ----start-- Simplest way is to follow the guidelines he website no longer active 1-1/2 inch pipe for up to 1800 gph 2 inch pipe for up to 3600 gph. More complicated way is to iteratively estimate the total head, which is the sum of static head plus dynamic head. Here's a table of dynamic head (pipe friction back pressure): website below no longer active http://www.flash.net/~blhill/pages.a....html#friction 2400 gph through 70 feet of 1-1/2 inch pipe = 6 foot dynamic head. 2400 gph though 3 feet of 1 inch hose = 2.4 foot dynamic head Total head = 3 + 2.4 + 6 = 11.4 feet. Now refer to the performance table on the pump's box. Guess the flow rate at 11 foot head would be 1200 gph. Use that for the next iteration. 1200 gph, 70' 1.5" pipe = 2 foot head 1200 gph, 3' 1" hose = 1 foot head Total head = 3 + 2 + 1 = 6 feet. Again referring to the pump's table, 1700 gph at 6 feet. 1700 gph, 70' 1.5" pipe = 4 foot 1700 gph, 3' 1" hose = 1 foot Total head = 8 feet. Pump table: 1500 gph at 8 feet. 1500 gph, 70' 1.5" pipe = 2.8 feet 1500 gph, 3' 1" hose = 1 foot Total head = 7 feet. Pump table: 1600 gph at 7 feet. Iterate again, we'd get 1550 gph. Close enough. If you go to 2 inch pipe, head will be 3 feet less, flow will increase by about 300 gph. If you get rid of the 1 inch hose, head will be 1 foot less, flow will increase by about 100 gph. Both together, 2 inch pipe, dynamic head would be 1.5 foot, total head 4.5 feet, flow 1850 gph. That's a 15 to 20 percent increase in flow. Not clear if it's worth it; depends on how much trouble it'd be to replace the pipe. For all these Danner pumps, as head increases, both water flow and electric power drawn decrease. The Danner 2400 gph pump has 1 inch fittings. I think these act as nozzles to limit the maximum flow if no plumbing were attached. This keeps a load on the motor, limiting the maximum electric current and heat the motor must dissipate. That's just a guess, though. - Rod ----end-- ~ jan ------------ Zone 7a, SE Washington State Ponds: www.jjspond.us |
#2
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Flow rate vs. pipe diameter
Check this link. It is from the makers of Sequence pumps.
http://www.mdminc.com/Friction_Loss_Chart.htm "~ jan" wrote in message ... This was originally posted by Rob Farlee in RP: The links do longer work, perhaps someone knows of a good one we could use? ----start-- Simplest way is to follow the guidelines he website no longer active 1-1/2 inch pipe for up to 1800 gph 2 inch pipe for up to 3600 gph. More complicated way is to iteratively estimate the total head, which is the sum of static head plus dynamic head. Here's a table of dynamic head (pipe friction back pressure): website below no longer active http://www.flash.net/~blhill/pages.a....html#friction 2400 gph through 70 feet of 1-1/2 inch pipe = 6 foot dynamic head. 2400 gph though 3 feet of 1 inch hose = 2.4 foot dynamic head Total head = 3 + 2.4 + 6 = 11.4 feet. Now refer to the performance table on the pump's box. Guess the flow rate at 11 foot head would be 1200 gph. Use that for the next iteration. 1200 gph, 70' 1.5" pipe = 2 foot head 1200 gph, 3' 1" hose = 1 foot head Total head = 3 + 2 + 1 = 6 feet. Again referring to the pump's table, 1700 gph at 6 feet. 1700 gph, 70' 1.5" pipe = 4 foot 1700 gph, 3' 1" hose = 1 foot Total head = 8 feet. Pump table: 1500 gph at 8 feet. 1500 gph, 70' 1.5" pipe = 2.8 feet 1500 gph, 3' 1" hose = 1 foot Total head = 7 feet. Pump table: 1600 gph at 7 feet. Iterate again, we'd get 1550 gph. Close enough. If you go to 2 inch pipe, head will be 3 feet less, flow will increase by about 300 gph. If you get rid of the 1 inch hose, head will be 1 foot less, flow will increase by about 100 gph. Both together, 2 inch pipe, dynamic head would be 1.5 foot, total head 4.5 feet, flow 1850 gph. That's a 15 to 20 percent increase in flow. Not clear if it's worth it; depends on how much trouble it'd be to replace the pipe. For all these Danner pumps, as head increases, both water flow and electric power drawn decrease. The Danner 2400 gph pump has 1 inch fittings. I think these act as nozzles to limit the maximum flow if no plumbing were attached. This keeps a load on the motor, limiting the maximum electric current and heat the motor must dissipate. That's just a guess, though. - Rod ----end-- ~ jan ------------ Zone 7a, SE Washington State Ponds: www.jjspond.us |
#3
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Flow rate vs. pipe diameter
RichToyBox wrote:
Check this link. It is from the makers of Sequence pumps. http://www.mdminc.com/Friction_Loss_Chart.htm Polite request................could we snip a bit? -- ßôyþëtë London, UK |
#4
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Flow rate vs. pipe diameter
On Thu, 26 Apr 2007 07:43:54 CST, "RichToyBox"
wrote: Check this link. It is from the makers of Sequence pumps. http://www.mdminc.com/Friction_Loss_Chart.htm I guess I wasn't thinking friction loss at the time. I just wanted to know how much flow was possible thru say 1" pvc? I'm so rusty I sort of forgot about elbows & such. Tx, ~ jan ------------ Zone 7a, SE Washington State Ponds: www.jjspond.us |
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