Submersible pump and well

[barrywhite]

Hi, I'm seeking information on whether this will work or not?

I have a borehole but it only produces a small amount of water and lately its running dry, we always knew it was a low capacity well but had to use it.

The submersible pump on it currently pumps into a 200 litre pressure tank right next to the well. That's the current system works well except now running dry.

I also have another well which is not currently connected but is 80 metres away from this one but produces a lot more water and should'nt run dry

(4-5000litres an hour)

What I want to do is drop a new pump down the new well and then run it through 80 metres of 1 inch or 2 inch diameter pipe ( single length hdpe) underground ( 1 metre deep) to the old well and disconnect the old well so the new well will feed into the same pressure vessel.

Would the submersible pump have any problem being 80 metres away from the pressure vessel.

i.e the new sumbmersible will pump water up from about 50 metres vertically to ground level then 80 metres horizontally to the old pressure vessel

( not really old)

I will install a non return valve in the system at the new well head.

Anyone think it's ok?

Thanks for any tips etc

[Crossy]

I see no reason why it shouldn't work.

Use the biggest pipe you can afford to minimise friction head losses, ensure the power cable is adequately sized for the distance (let us know the pump you intend using and we can sort the cable size).

[barrywhite]

I see no reason why it shouldn't work.

Use the biggest pipe you can afford to minimise friction head losses, ensure the power cable is adequately sized for the distance (let us know the pump you intend using and we can sort the cable size).

Thanks ,It's a Franklin 1hp 750w 7.9amp pump and has a 2 inch output, I can run any size hdpe from it ,the connections to the pressure tank are 35mm so maybe go with that all the way after the well head? alongside I will run some 3 core NYY cable which is already on a 16a earthed circuit the 80 metres Size of each core 4mm or would smaller do for current drop over that distance ( read it would only be 4v so maybe 2.5mm 3 core NYY))

Edited April 18, 2016 by barrywhite

[barrywhite]

When the output from your pump is 2" use 2". Any diameter change is friction. Diameter increase is a huge friction.use as long as possible the 2"

Same as Crossy, it will.work.

Good luck!

Arjen.

Thanks

[Crossy]

I see no reason why it shouldn't work.

Use the biggest pipe you can afford to minimise friction head losses, ensure the power cable is adequately sized for the distance (let us know the pump you intend using and we can sort the cable size).

Thanks ,It's a Franklin 1hp 750w 7.9amp pump and has a 2 inch output, I can run any size hdpe from it ,the connections to the pressure tank are 35mm so maybe go with that all the way after the well head? alongside I will run some 3 core NYY cable which is already on a 16a earthed circuit the 80 metres Size of each core 4mm or would smaller do for current drop over that distance ( read it would only be 4v so maybe 2.5mm 3 core NYY))

I would use 4mm² for about 9V drop on pump start, but use 2 x 4mm² (cheaper) and bash in a ground rod at the pump / top of the bore.

Since you're running underground with the pipe you'll need an RCD / RCBO at the supply end anyway.

[kannot]

I see no reason why it shouldn't work.

Use the biggest pipe you can afford to minimise friction head losses, ensure the power cable is adequately sized for the distance (let us know the pump you intend using and we can sort the cable size).

Thanks ,It's a Franklin 1hp 750w 7.9amp pump and has a 2 inch output, I can run any size hdpe from it ,the connections to the pressure tank are 35mm so maybe go with that all the way after the well head? alongside I will run some 3 core NYY cable which is already on a 16a earthed circuit the 80 metres Size of each core 4mm or would smaller do for current drop over that distance ( read it would only be 4v so maybe 2.5mm 3 core NYY))

I would use 4mm² for about 9V drop on pump start, but use 2 x 4mm² (cheaper) and bash in a ground rod at the pump / top of the bore.

Since you're running underground with the pipe you'll need an RCD / RCBO at the supply end anyway.

Thanks

[Artisi]

When the output from your pump is 2" use 2". Any diameter change is friction. Diameter increase is a huge friction.use as long as possible the 2"

Same as Crossy, it will.work.

Good luck!

Arjen.

Any diameter change is friction. Diameter increase is a huge friction WRONG​.

Increasing the pipe diameter reduces friction by D^5 power of the pipe diameter.

[Artisi]

When the output from your pump is 2" use 2". Any diameter change is friction. Diameter increase is a huge friction.use as long as possible the 2"

Same as Crossy, it will.work.

Good luck!

Arjen.

Any diameter change is friction. Diameter increase is a huge friction WRONG​.

Increasing the pipe diameter reduces friction by D^5 power of the pipe diameter.

OK let's say different.

An increase in diameter causes a higher friction then the same amount of reduce in diameter.

I don't know what you are saying - sorry.

An increased pipe diameter results in lower friction loss thru' the same length of pipe.

a reduction of pipe diameter results in a higher friction loss thru' the same length of pipe.

The formula is D1/D2^5 - - -

D1 is the new diameter either larger or smaller

D2 is the original diameter either larger or smaller.

For interest, changing the flowrate in the same diameter pipe is Q1/Q2^2 -- more flow more loss , less flow less loss.