Hi Dennis,
I looked at that space as being a very good location for a flex tank.
How many points is it hanging from? How are the anchor points secured to hull?
Is a flex waste tank vented? How is pump-out achieved?
Is the hull & cabinet in that area "lined" to minimize chafe?
Cheers, Russ
Sweet 35 mk-1
At 07:04 AM 16/08/2012, you wrote:
Chuck (and Joe),
Several reasons. Added capacity, no vent (and thus no air) and easy
to check level. Let me elaborate.
Touche's original factory tank was a 21 gallon baffled fiberglass
"tub" with a flange and riveted top made to fit under the dinette
seating. The top was sealed with butyl rubber. Touche' had been
idle for many years when I bought it. I removed the top on the tank
by drilling out all the rivets. The inside was covered with
mold. I scrubbed it clean and re-assembled it. The top always
leaked after that. When I filled it, it would leak at the top
flange. Also when the boat heeled, I lost a percentage of the
contents so the tank never was 21 gallons, more like 18-19 gallons.
Even though the rigid tank appeared to be designed to fit the
compartment, there was a lot of room around it. The bladder tank
expands to almost completely fill the compartment. Going from "21"
to 26 gallons was 25% minimum increase in capacity.
The bladder tank is essentially a sealed system. With no vent, air
can't get in, chlorine disinfectant can't evaporate out. The
opportunity for algal or fungal growth is minimized.
To determine how much water we have, we simply lift the compartment
access and look at the tank or push on it.
I think bladder tanks are perfectly acceptable for liquid storage on
boats. Touche' also has a flexible tank for wastewater (I resisted
the term bladder waste storage tank thinking it would either be
redundant or confusing :) ). It hangs between the head liner and
the hull right behind the head itself.
Bladder tanks are used in the aviation industry for fuel. I have 2
friends here that have bladder tanks for diesel storage. One of
them is custom made. I know because I went inside the compartment
to measure for it. It's a large tank.
The BIG caution when installing a bladder tank is to thoroughly
examine the selected compartment for abrasion and puncture
points. I found a few rough spots on the inside of the hull that I
ground flat.
Dennis C.
Touche' 35-1 #83
Mandeville, LA
From: Chuck S <[email protected]>
To: [email protected]
Sent: Thursday, August 16, 2012 7:02 AM
Subject: Re: Stus-List Where the heck is a 100 gallon water tank in
this boat???
Dennis,
Why do you like the bladders better than the rigid plastic tanks?
Chuck
Resolute
1990 C&C 34R
Atlantic City, NJ
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