Well pump lifts water 54 m , but only submergible to 7m

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Sprinkler

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Hi, I'm interested in buying a specific water pump for a 60 metre well - I want to install the pump at 25 metres from the surface- the pump in question has a max water lift of 54 m and a submergible limit of only 7 metres. I want to install the pump at 25 metres from the surface, so a total lift of 54 m would be more than sufficient.
My question is why is the submergible limit only 7 metres if the total lift is 54m? Could it be because there is a plastic floating switch attached, which would implode at levels below 7m ? Thanks.
 

Valveman

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I don't see where is says 7M. But my Spanish is not that good. It could be that there is only 10M of electric cable attached. But it could also be the float on the float switch would implode with more submergence.
 

Reach4

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7 meters (~ 23 feet) is about where a suction pump might be specified to be able to draw reliably from. Probably a coincidence.

Why would you be looking to put a pump with a float switch and a bottom pickup more than 7 meters into the water?
 

Sprinkler

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7 meters (~ 23 feet) is about where a suction pump might be specified to be able to draw reliably from. Probably a coincidence.

Why would you be looking to put a pump with a float switch and a bottom pickup more than 7 meters into the water?
Well first of all, it's a narrow bore well - too narrow to allow a float switch to0 move up and down (turn on and off). So, as in the case of the last (small) pump which also had a float switch, I'd be planning to remove the float switch altogether (probably by cutting the cable and carefully casing the repaired connection in the usual resin, to fully waterproof it. Also, the water table is usually stable at around 5 or 6 meters from the surface, but when the pump fills the attic tank, the level goes down by maybe 3 or 4 meters. Basically, the last pump was at a depth of 25 meters, so it was a safe distance, with normal water usage, including some watering of trees. I don't have an on/off dry pump sensor installed.
 

Reach4

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I think you would be better off with a pump designed to go into a well.
 

Sprinkler

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I think you would be better off with a pump designed to go into a well.
Ok, this is more detailed information about the "7 m" pump. It's a pdf link and the easiest way to find the pump is to write 201994 in the search: http://www.gduran.com/gxpareas/Tarifas2/ESPA.pdf I'm still a bit baffled about why a 7m limit? This pump is about 1,5 feet in length - the old pump I had at a depth of 25m was less than 1 foot long. (water lift capacity around 40m), while the 201994 pump lifts water to 54m.
 
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