[Alberg30] Holding tanks

[Jack Vanderloo]

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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