[Alberg30] Holding tanks

Wed Mar 21 09:33:54 PST 2001

I don't know of anything that sticks to polyethylene, maybe your plastics
shop could advise you, and if there is, I would love to know what it is. In
your case I would use 3M5200 as a bedding compound for the top of the tank,
install the top using SS sheet metals screws but I would not tighten them
all the way. I would let the 5200 setup for about a week prior to final
tightening, so a "gasket" is formed. The 5200 won't adhere to the tank top,
but the mechanical fasteners with the 5200 gasket should keep it from
leaking. Check with you plastics supplier and let us know what they have to
say. When I replaced the top of my water tank, for the same reasons: the
gray caulking had dried; the rivets were leaking; and the aluminum was
oxidizing into my drinking water; I used a sheet of "G10" 1/4" epoxy. It's
worked fine now for years, but it was tough [nearly impossible] to cut.

Mike Lehman
840 Mill Creek Road
Arnold, MD 21012
(410) 544-9067 (Home)
(443) 253-7054 (Mobile)

sail_505 at hotmail.com

----- Original Message -----
From: "Jack Vanderloo" <jvdloo at sympatico.ca>
To: <public-list at alberg30.org>
Sent: Wednesday, March 21, 2001 11:21 AM
Subject: Re: [Alberg30] Holding tanks

> Mike,
>
> This is concerning your comment about a lack of any known bonding agent
adhering
> to polyethelene.  Great - I just went to the expense, albeit minor, of
having a
> plastics specialty shop make me a new holding tank cover and nipples of -
you
> guessed it - 5/16" polyethene!  Now, I suspect you were discussing bonding
> polyethelene to polyethelene; my question concerns sealing, first, and
adhesion as
> a lower priority.
>
> My boat is a newer model with liner, so the tank is under the floor boards
> amidships.  The old aluminum cover was sealed with grey goop and rivetted
to the 1
> to 1 1/2" liner lip.
>
> Given that it still being around 0 degrees celcius here and the boat
probably
> still under 5' of snow, plus the fact my boat is some 250 miles from here
this
> year, I will not be getting around to re-installing the cover until early
May.
>
> So, do I take from your comments that I may have certain, er, shall we
say,
> difficulties with this retrofit job?!?
>
> Any advice would be appreciated.
>
> Jack
> Aldabi - KC641
>
> P.S. - I believe we may have met back in '93 in Oxford at the CBA30A
annual dinner
> - I was in the process, then, of moving up from an Alberg 22.  Hospitable
crowd,
> as I recall!  Cheers.
>
> Do
>
> Mike Lehman wrote:
>
> > The fittings should be welded, there is no bonding agent, that I know
of,
> > that will adhere to polyethylene. With the fitting simply screwed into
the
> > tank there is the risk of a leak. Believe me, this is one tank you don't
> > want to leak anywhere. When I made to original measurements for this
tank
> > [Kracor #5057] I did it on my boat #505 that has a liner, figuring that
if
> > it fit a boat with a liner, it would easily fit into a boat without one,
> > sounds logical, doesn't it? Well as it so happens, the forward cabin
plywood
> > bunk platform is lower in boats without liners by a couple of inches.
This
> > meant that tanks with top-mount fittings for the vent lines were a
little
> > too high, by about 1/2". One solution was to cut an additional piece of
> > plywood and put it over the existing, another was to cut some small
round
> > holes to let the vents have more room, and the other was to relocate the
> > vent fittings to the forward wall of the tank as high as possible. This
last
> > one was the neatest 'most factory like' solution. I will post some
pictures
> > of the installation so you can see what's involve with securing the
tank. A
> > picture is ,as they say, worth a thousand words.
> >
> > Mike Lehman
> > 840 Mill Creek Road
> > Arnold, MD 21012
> > (410) 544-9067 (Home)
> > (443) 253-7054 (Mobile)
> >
> > sail_505 at hotmail.com
> >
> > ----- Original Message -----
> > From: "greg vandenberg" <fashionguy at ameritech.net>
> > To: <public-list at alberg30.org>
> > Sent: Tuesday, March 20, 2001 9:04 PM
> > Subject: Re: [Alberg30] Holding tanks
> >
> > >
> > >
> > > Mike Lehman wrote: What's your boat #. I've installed lots of these,
> > >
> > > > maybe I can help with some advise.
> > >
> > > Thanks Mike... My hull is # 312. No liner. I would like any pointers
you
> > could
> > > share.
> > >
> > > Q- Can I tap and thread  in fitting with a bonding agent ... or do I
have
> > to weld
> > > all fittings?
> > > Q- How are these tanks best secured in place?
> > >
> > >
> >
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