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Old 04-17-2013
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Question Fitting multiple flexible watertanks

We had one of our four stainless tanks (water) throw its contents into the bilge last weekend they are 35 years old and on inspection all are starting to corrode at the welds.

Have decided we would like to replace them with flexible tanks as this would allow us to make some other mods. in their locations.
Our question is this:
Currently all four rigid tanks are linked together into a central distribution manifold. The deck filler leads to the numberone starboard tank which is situated under a settee berth ,when this is filled the water flows through the manifold (under the cabin floor) and in turn the water fills the other 3 tanks, all of which are vented via hoses to atmosphere.
The flexible tanks do not have vents because they expand as they are filled.

We would like to use the existing manifold arrangement, as on board cold water feeds (heads, galley, calorifier) are also taken directly from the same manifold.

As I am no fluid engineer I can't get my head around the problem of whether (or not!!) all foour tanks would fill in the same way as the rigid ones we want to replace without vents to them.

Anyone got a similar set-up??

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