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External pumps
On Sun, 05 Sep 2004 10:01:22 -0600, W Dale
wrote: ===Any one have recommendations for good external pump for a 4,000+gal. ===pond? I am trying to get ready for the eventual demise of my two SG ===4300's. What I keep reading is that for larger ponds, external pumps ===are the way to go. ===Thanks for your comments and input ===W. Dale Most effieciency in the external pumps come from their size and the amount of windings they have, as comparted to submersibles. While some sub types run in oil, and others are encapsulated n epoxy, they still build up heat and heat in any electrical device is wasted energy, as the hotter it gets the more it looses. Subs get warm even submerged in water. Open air designs as most externals are are pretty good at getting rid of heat and not transferring latent heat to water in the process. I think the whole concept of sub is great from the average homeowners standpoint with ease of installation and wiring.......Usually just slip on tube and plug it in after dropping it in the pond. Ext types usually are a lot more involved and not geared to as many home owners abilities or uses, in size and complexity. Ext also operate more efficeintly mainly due to the usual type of plumbing they are hooked up with. Lots opf things will govern just how efficient any pump is. There was just a 3 month old Hayward Super Pump of 1/2 hp (420 watt) ext pump sold on ebay for $61.00 complete with primer and filter basket strainer. That pump lists for close to $300.......and puts out 54 GPM at 20 foot head or 29 gal a minute at 40 feet of head which is pretty darn good. I had my eye on it but did not get to the computer in time to place my bid this morning...... I am currently looking at AZponds pump and strainer basket pumps that they have on sale. A lot of the inground pool type pumps will work more than satisfactorily for pond use, and since there are a lot of pools / hot tubs out there as compared to ponds I find the prices on them a lot lower than the average typical water garden pumps cost. One thing to be aware of though is a lot of companies "UP" rate their pumps to make it sound better. For example. A pump rated at say a service factor of 1 and of 1 hp . Well if you use a service factor of 1.5 for that same pump / moptor you now get a pump rated at, 1 1/2 hp. It will not pump any more than the 1 hp pump will as its the same exact pump and motor combination, but has a different service factor, but odds are running at that higher service factor it will not last as long as the same exact pump rated lower..........its all a numbers game. Lower service factor the better.......so why pay more for a pump with a different label on it with a claimed higher hp. Thats about all thats really changed is the labels on a lot of pumps.......You are lead to believe if you get a 1 1/2 hp it won;t have to work as hard as a 1 hp and its only $20 bucks more, but for your 20 bucks all you got was a new label and a pump with a shorter overall lifespan. Its a given so many watts equal a horsepower. What that wattage is slips my mind at the present. Visit my website: http://www.frugalmachinist.com Opinions expressed are those of my wife, I had no input whatsoever. Remove "nospam" from email addy. |
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