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The Norfolk Broads Forum / Broads Boat Owners Q & A / Fresh water bag/tank help
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Posted By Discussion Topic: Fresh water bag/tank help

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rudging
Aug-30-2007 @ 1:04 PM                           Permalink
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Hi, I have a fresh water bag fitted in the bow of my Birchwood replenished from a deck filler. The bag has a 1/2" fitting at the bottom which goes to the filter/pump etc. It works well BUT, the water capacity is not enough and I have no way of easily telling how much I have. I have hit on the idea of fitting an aux poly tank with guage coupled to the 1/2" fitting but believe that unless I can vent this tank to let air out, it will not fill (the bag collapses and so does not need a vent). How does the standard rigid tank venting set up work so that if the filler overflows, water does not escape from the tank? Has anyone else done this?  - Colin

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Aug-30-2007 @ 8:01 PM                           Permalink
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Easy, yust make sure the vent tube is routed to an outlet point well above both the tanks and it will not overflow. If it is borderline the vent may need a syphon break but that is unlikely.

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Aug-31-2007 @ 8:43 AM                           Permalink
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Thanks for the help on this. I am still not clear though on a couple of points - Is there a specific water tank vent I can buy or can I use say a diesel tank vent that I have seen in chandlers? What is the general size of vent pipe -1/2" or less perhaps? Presumably it is better to mount it on the side of the boat superstructure rather than the deck to prevent ingress?  - Colin

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Aug-31-2007 @ 9:12 AM                           Permalink
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1/2" is plenty, a vent outlet is a vent outlet, diesel, air, water, whatever, the only one that is different is a petrol one which must incorperate a flame arrestor screen. Personally I would just use a poly skin fitting (KISS principle) and lead the pipe to a convenient point on the topsides incorperate a loop just before the vent to take the pipe a bit higher if you need to.

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Aug-31-2007 @ 9:30 AM                           Permalink
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Hi, thanks - all clear now. One further question if I may. The water in the current bag system always seems to stay fresh, presumable because it has minimal air. Am I more likely to get algae type problems with this vented poly tank combined system?


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