linking water tanks

[paulburton44]

I want to increase the amount of stored water. I have a aluminium tank at the moment which is fine just not very large about 70l. I am thinking about adding a flexable tank ! not sure how to link the 2 together. I don't want to add another deck filler.

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[MLBURGE]

Is there a fitting at the bottom of the original tank that you can plumb into for the outlet balance connections. You could then tee into the 38m - 50mm filler pipe to run to the second tank and it will fill once the original is full.

Could you not just change to one larger tank 'space providing'. (could make you a good custom grp tank any size/shape)


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[Anthony]

just put them together in T piece, may require some fiddleing / head scratching in chandlers / diy stores to get the pipe sizes to match. I have put ball valves in the lines from both of mine so that I can use one tank and then the other if I wish, also means if one leaks, I should still have another tank rather than the leak draining both.

Each tank does have a deck filler, and even with the 15mm pipe open between the two, they dont fill up evenly, I fill one up, and it will start to fil the other, but I normally just use the second filler to. Otherwise I would have to let it settle before topping it up some more, just something to beware of. Obviously a bigger pipe between the two would help.

Anthony

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[paulburton44]

I will not be able to take the old tank out. (without removing the engine)
So if i link the 2 outlets with a tee off to the tap. Fit a ball valves between the tank and the tee on each tank, so i can use either tank separately.
Then fit a new deck filler for the new tank.
Will there be any problems with one being rigid and one flexible ?
Any problems leaving both valves open ?



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[Strathglass]

The new tank should ideally be mounted at a lower level than the existing tank, otherwise the new tank would not start filling until the water level in original tank reached the height of the new tank.

Use a T junction as has been sugested. but also add a ball valve in the line from the new tank to allow the new flexable tank to be shut off in case of future problems.

Iain

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[Colin_S]

Simplest way IMO would be to add a second tank with the bottom at the same level as the original and join them together at the lowest possible level. Add a high level breather pipe to the new tank and when you fill the first the second will fill to the same level at the same rate (assuming connecting pipe is large enough to accomodate flow rate).
The only downside I can see is that you would be basically sharing the water between the tanks and any problems (leaks, contamination, etc.) in one would be transfered to the second. Depending on your set up you could overcome this with a few extra bits of pipework and some isolating valves.
How is the water feed to your sink, etc. conected to the original tank?

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[Geordie]

A breather pipe is not neccessary on a flexible tank, which will collapse as water is withdrawn. Withdrawing water from a rigid tank will create a vacuum, hence the need for a breather.

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