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Vent for additional water tank


Clodi

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I am fitting an additional water tank under a double bed, it shall be in line with the current stainless bow tank and the pump will be fitted after the 'new' tank.

As we are having alterations to our bow area I intend to have our water filling point connected to this new tank with a vent on the bow tank to facilitate filling. A new bow tank will have to be fabricated.

My question is, Will this work?

The top of the 2 water tanks will be more or less level so I'm hoping filling will be pretty straightforward & there will be a stoptap between the tanks.

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The highest point of each tank will need a vent, or they won't fill, or drain. There has to be a way for air to get out and in, or the tank won't fill, or empty.  Connect top to top of each tank to a single vent, but no down slopes as Boater Sam says. Easiest to set up would be entirely seperate vents on each tank. As long as the top of the under bed vent is significantly higher up than the top of the under front deck vent, then there is very little chance of water being vented in to the cabin from sloshing, or over filling. Will go out the lower under deck vent for preference, then overboard via the scuppers. Suggest taking the under bed vent top almost up to ceiling level.

 

Jen

Edited by Jen-in-Wellies
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1 minute ago, Jen-in-Wellies said:

The highest point of each tank will need a vent, or they won't fill, or drain. Could connect top to top of each tank to a single vent, but no down slopes as Boater Sam says. Easiest would be entirely seperate vents on each tank. As long as the top of the under bed vent is significantly higher up than the top of the under front deck vent, then there is very little chance of water being vented in to the cabin from sloshing, or over filling. Will go out the lower under deck vent for preference, then overboard via the scuppers. Suggest taking the under bed vent top almost up to ceiling level.

 

Jen

Whats a ceiling Jen? ?

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1 hour ago, Clodi said:

Thanks everyone, 2 vents it will be, both as high as possible ?

 

Well not quite. Better if the vent on the bow tank is significantly lower than the one on the under-bed tank. That way if any water does slosh out of a vent, it will come harmlessly out of the bow tank vent, and not inside the boat's accommodation.

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I plumbed a second tank in  on the barge tried using one filler never managed to get it to work properly. It would have meant new plumbing between the tanks in 28mm to allow them to fill at the same time and as the feed to the pump was already in the boat that was out.

Ended up with 2 fillers and two vents. Top of bow tank was about 100mm above the rear tank and the bottom of rear tank was 200mm below front tank, both filled and vented high. Both tanks had separate feeds to the pump with valves next to the pump, the front emptied first, turn off its valve and then there was an extra 200L in the rear as a reserve. Always filled rear tank (lower one) then bow tank worked well although I did tend to refill just before the front tank emptied. Total capacity was about 1400L.

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Providing both tanks are vented and the pipe linking the two tanks together is as big as possible there may be one filler. However if the link pipe is too small iad restrictive to flow t would take a while to fill both tanks from a single  filling point into one tank . A filing point for each tank would be a safer bet and is essential if the link pipe between the tanks has to be small and long due to the confines of the boat.

 

A sea boat would probably have two independent tanks with valves to switch the supply to take water from one tank or the other.

 

 

 

 

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42 minutes ago, MartynG said:

A sea boat would probably have two independent tanks with valves to switch the supply to take water from one tank or the other.

On the Cruiser we have one central keel tank of 600 litres.

On the Cat we have two independent tanks in the built into the Bow lockers (of about 300 litres each). They have a single (2") fill point and dual pipes running back to the pump with valves on each feed. You can switch over when one is empty and know its time to fill up at the nest convenient point.

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2 hours ago, Alan de Enfield said:

On the Cruiser we have one central keel tank of 600 litres.

On the Cat we have two independent tanks in the built into the Bow lockers (of about 300 litres each). 

You seem to like boats with big tanks!

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38 minutes ago, Alan de Enfield said:

Long distance cruising - there are not many water taps between Tenerife and the USA (for example)

 

From Croatia back to Hull (3100 miles) we only stopped for water twice.

But presumably you have a fairly large watermaker?

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5 minutes ago, frahkn said:

But presumably you have a fairly large watermaker?

Nope 

No watermaker (but before a Europe US crossing I would be getting one) they do use a horrendous amount of power which is not readily available on a sailing boat.

 

Trying to 'park' a 38 foot boat into a 40 foot space with a 3-4 knot tide running and breasted up boats to squeeze past.

 

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Edited by Alan de Enfield
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5 hours ago, MartynG said:

Providing both tanks are vented and the pipe linking the two tanks together is as big as possible there may be one filler. However if the link pipe is too small iad restrictive to flow t would take a while to fill both tanks from a single  filling point into one tank . 

 

 

Wouldn't make any difference at most of the CRT water points I have ever used! They are so slow.

 

Unlike filling the linked fuel tanks on a GU motor. You think you've filled the tank to the brim, then a minute or two later it's only half full. Repeat ad nauseam if you want to fully fill both tanks.

Edited by David Mack
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