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Re: Poly Holding Tank
I went through a similar story last spring; a couple seasons ago the aft tank in my 1998 Jeanneau SO 45.2 had developed pinholes at the lower corner (it is a 130 litre tank under the aft port berth, hence wide, long, and relatively shallow). When we first discovered the pinholes the yard did a temporarily repair with JB Weld, which actually worked very well, but the thought of that corner of the tank eventually dropping out scared me.
Because the tank is under a berth with only about 1/2" space above it plus the thickness of the wooden berth surface (cut out to clear the tank sensor) and the dip tubes exit the ends (pump-out and vent aft, inlet and (decommissioned) overboard discharge forward), I was unable to find anyone who could build a poly tank that would fit without major renovations. Jeanneau quoted USD $800 for the tank, not including shipping from France, and I had reservations about both the longevity and accuracy of the fit a dozen years later (the PO got a replacement rudder that was significantly different from the original and eventually had to be returned).
I finally went with a local metal shop who made a custom tank out of thicker gauge and better quality (316) stainless, with the fittings exactly where they needed to be. I had to shave a small section of the berth cover underside 1/4" to clear one corner, but otherwise it was a drop-in and IMO well worth it.
The original quote was for CAD 1790 in 12GA 306 or CAD 2040 in 12GA 316, but the final invoice was $1270 for the 316 version. Based on the weight difference alone, this one should last me a good while. Now I'm thinking of the forward tank, which doesn't leak (yet), (I think).
I have no relation to the company other than as a satisfied customer; but they aren't exactly in your neck of the woods, and shipping a tank that size won't be cheap (I was lucky to be able to borrow my nephew's car trailer).
Atelier d'Usinage Choiniere
100 Kemp, Bedford Quebec
I dealt with Etienne. It may help if you can speak French.
1998 Jeanneau SO45.2