External pump push/pull?
I've been using submersible pumps because there is no easy way to hide an
external pump around my pond. I do have a wooded slope 20-30 feet away from the edge of the pond, so I decided to snake a stream down the slope with a couple of small vf pools along the way. My plan was to bury flex pvc from the pond to the external pump hidden behind a bush next to the top pool and run the electric back to a shed rather than near the pond. So I ordered a Sequence Cimmaron. When I got it in and started reading the documentation, it says to push water instead of pulling. In other words, put the pump by the pond and not hidden up the hill. Is my plan screwed? If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. |
External pump push/pull?
3' horizontal is supposed to be equal to 1' vertical when figuring pumping
"head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing with, as wellas the other 25 ' on the other side of the pump Gale :~) If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. |
External pump push/pull?
3' horizontal is supposed to be equal to 1' vertical when figuring pumping
"head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing with, as wellas the other 25 ' on the other side of the pump Gale :~) If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. |
External pump push/pull?
"Gale Pearce" wrote in message
... 3' horizontal is supposed to be equal to 1' vertical when figuring pumping "head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing with, as wellas the other 25 ' on the other side of the pump Gale :~) The chart from sequence has a friction loss of 3 - 6 ft per 100 ft of 2" pipe at the flow rate for this pump. Is your horizontal/vertical loss an additional factor? |
External pump push/pull?
"Gale Pearce" wrote in message
... 3' horizontal is supposed to be equal to 1' vertical when figuring pumping "head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing with, as wellas the other 25 ' on the other side of the pump Gale :~) The chart from sequence has a friction loss of 3 - 6 ft per 100 ft of 2" pipe at the flow rate for this pump. Is your horizontal/vertical loss an additional factor? |
External pump push/pull?
On Sat, 06 Mar 2004 15:09:57 GMT, "gribbee"
wrote: Is my plan screwed? If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. The idea of pushing water must mean to place the pump below the water line so it doesn't have to prime itself. Once the flow is started I don't see how the pump operation could be any different, because the pump action is the same whether it is above or below the water level. I'm not familiar with this kind of pump, but you might benefit from a priming pot. http://www.azponds.com/leaf%20traps.htm Regards, Hal |
External pump push/pull?
"Hal" wrote in message
... On Sat, 06 Mar 2004 15:09:57 GMT, "gribbee" wrote: Is my plan screwed? If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. The idea of pushing water must mean to place the pump below the water line so it doesn't have to prime itself. Once the flow is started I don't see how the pump operation could be any different, because the pump action is the same whether it is above or below the water level. I'm not familiar with this kind of pump, but you might benefit from a priming pot. http://www.azponds.com/leaf%20traps.htm Regards, Hal You may be right about the below water level location. Rereading the 'installation hints' for the fifth time, the other statements seem less absolute than "The pump is designed to push water, not pull it." I'm going to see if I can put the pump at the bottom of the wooded area and push water uphill for the second half of the transit. BTW - I have a priming pot, which I got along with my pump from azponds.com. The pump is a new sequence 'value' model this month and I think azponds is the only distributor. |
External pump push/pull?
All pumps are better at pushing water than pulling water. The intake of my
pump is about 15 feet from the pond in a shed, but the water flow is gravity to the pump. If you look at performance curves for some of the pumps, they will have a 2 or 3 for lift on the suction side, and a 20 foot lift on the discharge side. -- RichToyBox http://www.geocities.com/richtoybox/pondintro.html "gribbee" wrote in message hlink.net... I've been using submersible pumps because there is no easy way to hide an external pump around my pond. I do have a wooded slope 20-30 feet away from the edge of the pond, so I decided to snake a stream down the slope with a couple of small vf pools along the way. My plan was to bury flex pvc from the pond to the external pump hidden behind a bush next to the top pool and run the electric back to a shed rather than near the pond. So I ordered a Sequence Cimmaron. When I got it in and started reading the documentation, it says to push water instead of pulling. In other words, put the pump by the pond and not hidden up the hill. Is my plan screwed? If I set it up as I planned, sucking water through about 50' of 2" pvc and up about 4', am I going to have problems? Would it make a significant difference if I had the pump in the middle, 25' from the pond, but before the slope? FWIW, the pump is rated for a little less than 3000 gph at 4' height. |
External pump push/pull?
The #'s I quoted below came from a "pond construction" book I read a few yrs
ago and I think they were for submersed pumps (don't know if that makes any difference for "out of pond" pumps) - seeing as how your info is newer and for the pump you have, I would use it - there may be some one else in this group that knows for sure - Good luck Gale :~) 3' horizontal is supposed to be equal to 1' vertical when figuring pumping "head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing with, as wellas the other 25 ' on the other side of the pump Gale :~) The chart from sequence has a friction loss of 3 - 6 ft per 100 ft of 2" pipe at the flow rate for this pump. Is your horizontal/vertical loss an additional factor? |
External pump push/pull?
"Gale Pearce" wrote in message
... The #'s I quoted below came from a "pond construction" book I read a few yrs ago and I think they were for submersed pumps (don't know if that makes any difference for "out of pond" pumps) - seeing as how your info is newer and for the pump you have, I would use it - there may be some one else in this group that knows for sure - Good luck Gale :~) Whew! I was thinking I'd need ANOTHER new pump. Actually, the chart indicates friction loss in that range for 1" pipe and high gph, so buying 2" pipe may have saved me. |
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