Andrzej Mazur wrote:Daniel 2004 wrote:The diaphragm pump is about 1000L / ha, the impeller is about 7000L / ha, and my well is 3 meters more efficient and the difference will be significant.I think that with this "higher" efficiency compared to the membrane one it is a big exaggeration
Theoretically yes. But for every meter of lifting, the pump's efficiency drops by some ten percent. There was even a formula somewhere to calculate this. I have read quite a lot about pumps, looking for answers to my questions, but I found little.
In your case, it's so cool that you are only 3 meters. So there won't be such a gigantic drop in performance. In my case, 6 meters is on the limit of the lifting height of most centrifugal pumps in the price from 140-200 PLN, which have this parameter up to 5, up to 8 meters (the 8 meters are often a marketing fiction). The average diaphragm pump costs PLN 80-100.
The advantage of the membrane is that it does not generate too much pressure in my situation, which allows watering from a hose.
I additionally have a hose on the plot up to the tunnel from 30 meters from the well. The snake itself has a little more. Then, the impeller will likely experience large efficiency losses because the pump will be heavily loaded.
Also take into account what I wrote, that cheap centrifugal pumps often have their parameters quite stretched. I watched a few models at the mall. I do not believe in their durability and performance. In my opinion, a centrifugal pump for PLN 100-140 may turn out to be a rather poor product.
Until now, I had a 225W diaphragm, weak, the water flew but at the same speed as if you turned on the tap at home.
I know there are 400W diaphragm versions, but due to the design, the efficiency will probably not increase much.
I am also a bit frustrated with the waiting time until I fill up the tank.
That's why I have a dilemma. I wanted to buy a centrifugal pump, hoping for a quieter operation and greater efficiency, but I cannot find a pump that can handle 6 meters, a hose over 30 meters, and at the same time does not have 1000W and does not cost a huge amount of money. And when asking in different places, he does not get the answer which pump is worth taking, taking into account the depth of the well.