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From: Shanica J II (no email)
Date: Thu Dec 13 2001 - 11:16:05 EST
Patrick,
I have to admit that I have never got a response from anyone in the marine
industry advoacting integral tanks. My experience and the responses that I
have receive to queries on this subect is that Integral fiberglass tanks are
a bad idea at best and aboat ruiner at worst.
Integral fiberglass tanks have 3 serious (unavoidable) problems.
1) They tend to suffer from less than fanatical contruction practises. This
means that they are a secondary bond, most often with polyester resin. This
means that in time they will fail and leak.
2) they are intergral and therfor un servicable/unremovable. The only way
to fix a leaking intergral tank is to line it with something, usually a
bladder. This is almost never a satisfactory retro.
3) If used for water tanks, they will forever impart a taste to the water
( that's why POly tanks are best for potable waer, they do not impart any
taste to the water)
Beyond that the ability to remove a tank to work on/replace far outweighs
the max capacity of an integral tank.
As an Aside: Notice that most Quality Yahct builders do not use integral
tanks. they use fabricated tanks, and almost never bladders. INtegral Tanks
almost always result in a lower resale value in the used market.
Pierre.
----- Original Message -----
From: <>
To: <>
Sent: Wednesday, December 12, 2001 7:50 PM
Subject: Re: lv-ab: Re: Holding tank
>
> On Wed, 12 Dec 2001 18:24:27 -0500 "Shanica J II"
> <> writes:
> > Stainless Steel has for a long time been regarded as a poor choice
> > for tanks
> > in a boat.
>
> Not necessarily true, it depends on the application. We use the proper
> grade of stainless steel in our boats for water tanks for clean, sweet
> tasting water. Works great. Everything has to be isolated properly with
> appropriate fasteners.
>
> > They suffer from corrosion due to oxygen starvation.
> > The best
> > tanks for Holding waste are Poly.
>
> Not necessarily true. We use integrated fiberglass holding tanks in our
> hulls. they are at the bow and serve as a collision barrier. Run over
> something in the water and you may hole the holding tank and the worst
> that happens is some minor pollution. The integrated holding tank also
> adds additional strength and reinforcement to the forward hull.
>
> > If you want to know. Black Iron or Monel make the best fuel tanks.
>
> Not necessarily true. Black iron is failed technology from the '70's.
> Monel is too expensive. Currently, the best material for fuel tanks is
> the proper grade of aluminum.
>
> > I'd use
> > Poly for Water and waste tanks.
>
> Not necessarily true, water will take on a plastic taste and Poly tanks
> are subject to cracking under some conditions.
>
> Patrick Gerety
> Willard Marine
>
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