Holding Tanks

emandvee44

emandvee44

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Can anyone help?
I am planning the installation of a holding tank for the aft heads, but before I start making up a model tank (it is a very irregular space available), and which may or may not result in a tank which fits the space, I thought I would ask the Forum for help.

Is there anyone out there who has a Bavaria 44 2002 vintage, with a holding tank in the aft heads who can give me accurate dimensions for the tank?

(Note that Tek Tanks, my preferred supplier, do not have any details on file)

Cheers,

Michael.
 
emandvee44 said:
before I start making up a model tank (it is a very irregular space available), and which may or may not result in a tank which fits the space
Click to expand...

?

Surely if you make a model that fits, the real tank will fit too? Tek are very good at making them to match.

Pete
 
emandvee44 said:
Can anyone help?
I am planning the installation of a holding tank for the aft heads, but before I start making up a model tank (it is a very irregular space available), and which may or may not result in a tank which fits the space, I thought I would ask the Forum for help.

Is there anyone out there who has a Bavaria 44 2002 vintage, with a holding tank in the aft heads who can give me accurate dimensions for the tank?

(Note that Tek Tanks, my preferred supplier, do not have any details on file)

Cheers,

Michael.
Click to expand...

Are you going for a gravity tank or a below the water pumped system? The original (if they fitted it) would probably be pumped - it was for my 37 of same vintage. Did not have it fitted from new and retrofitted a gravity tank in the locker in the loo - very similar to the setup in newer Bavarias. Similar to those made by Tek Tanks, and the guy who made it just made a mockup to use as much space as possible but still having enough fall to empty. Important to get the inlets and outlets in the right place. Mine has an inlet at the bottom with an internal stack and the outlet immediately below the deck pump out fitting.
 
I made a model to make sure it would fit. Sent Tek a drawing (see their website for guidance) and they sent back a proper drawing telling me the volume. The real thing turned out not to be as flexible as my cardboard version and it was a bit of squeeze to get it in :o Very helpful outfit.
 
Remember that the inlets and output pipes, seacocks etc all take up space above and below the tank. When you make your cardboard model, include them (get the sizes off the TekTanks site or elsewhere). Also, the proper piping is really stiff, so work out the route for it at the same time.

Like others said, Tek tanks were really helpful. We used one of their standard sizes into which they fitted the input/output pipes, sensor, inspection hatch etc. It all fitted perfectly, but it was a long and horrible job to get all the piping done! (This was in our previous boat)
 
Building your own tank is not rocket science and has the advantage that you can select what material and finish to fit in with the surroundings.

I use fibreglass and 40mm foam to provide insulation and avoid tank sweating. Usug standard poly resins and lining the inside with an epoxy.

Plumbing and a good size inspection hatch are a doddle. Most of the tanks I have made have a flow coat on the outside for aesthetics and durability.

Good luck and fair winds. :)
 
MoodySabre said:
I made a model to make sure it would fit. Sent Tek a drawing (see their website for guidance) and they sent back a proper drawing telling me the volume. The real thing turned out not to be as flexible as my cardboard version and it was a bit of squeeze to get it in :o Very helpful outfit.
Click to expand...
Best to make the mock-up in MDF (using a holt-melt gun to join the seams) for that reason - cardboard gives/twists too much.

+1 re: positioning of the inlets/outlets - I used ASAPs Seaflow sanitation hose which is very flexible & ideal for tight spaces.
 
On my 44 the holding tank is secured to the rear partition inside the cuboard behind the toilet. There is a gap of about 450mm below the tank to allow for access to the sea cock. The tank is a trapezium in cross section and about 900mm high, and 300mm deep. I have not seen any of a similar shape for sale, as I was looking at the possibility of fitting one to the forward head.
 
B&M said:
On my 44 the holding tank is secured to the rear partition inside the cuboard behind the toilet. There is a gap of about 450mm below the tank to allow for access to the sea cock. The tank is a trapezium in cross section and about 900mm high, and 300mm deep. I have not seen any of a similar shape for sale, as I was looking at the possibility of fitting one to the forward head.
Click to expand...

How about this
 
Firstly, many thanks for all the replies so far - some very useful information there.
The space in which the tank is to be installed is irregular, assymetrical or whatever, and I was hoping that someone out there would have a Bav 44 (300+ built?) with an aft holding tank, and therefore could give me the dimensions or even the supplier reference.
I can construct a tank model, and the MDF suggestion is very good, eliminating the flexibility factor of cardboard.

The attached thumbnail shows part of the for'd holding tank arrangement, particularly the hoses, which I believe are the very stiff type. I intend to buy the flexible ones (asap-supplies), which have been recommended previously on the Forum.

Any further suggestions welcome,

Cheers,

Michael.
 
Last edited:
Vetus do a bulkhead mounted tank that may fit. On p111 of the catalogue www.vetus.com The 60L one is about 40% less than a custom made one from Tek Tanks - but no good of course if it does not fit.
 
Ply

Last year i made one dont laugh!! Out of ply !



But I lined it with 4mm and 6mm polycarb Sealed in the corners with constructional silicone (Fish tank stuff).70 liters
 
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