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myv65 · 12-09-2003, 05:06 PM

Well a reciprocal congratulations is in order.

As to the rest of the post, centrifugal pumps need to be reliable and cheap. Efficient isn't too high on the priority list, especially for pond pumps.

You can get industrial pumps in excess of 80% efficient, but they have large diameter, low clearance impellers. Most of the stuff I use requires self-priming ability and needs to deal with solids. These open-vane impellers crap out in the 40-60% efficiency range.

You may be better served going with a fixed displacement pump. Homeboys would simply hack up an old lawn mower engine to get the job done. Some of the little units on pressure sprayers would also do, but the seal friction may be higher than desireable. Then again, IIRC the seals are loaded by the water pressure, so maybe not so bad at modest pressures. None of these solutions is as cheap as a good pond pump.

12-09-2003, 05:06 PM	#35
myv65 Cooling Savant Join Date: May 2002 Location: home Posts: 365	Well a reciprocal congratulations is in order. As to the rest of the post, centrifugal pumps need to be reliable and cheap. Efficient isn't too high on the priority list, especially for pond pumps. You can get industrial pumps in excess of 80% efficient, but they have large diameter, low clearance impellers. Most of the stuff I use requires self-priming ability and needs to deal with solids. These open-vane impellers crap out in the 40-60% efficiency range. You may be better served going with a fixed displacement pump. Homeboys would simply hack up an old lawn mower engine to get the job done. Some of the little units on pressure sprayers would also do, but the seal friction may be higher than desireable. Then again, IIRC the seals are loaded by the water pressure, so maybe not so bad at modest pressures. None of these solutions is as cheap as a good pond pump.