I know, there are lots of holding tank, made of good rotomolded
polyethylene...
But if space is small and irregular, the standard tanks may not fit...

epoxy-fiberglass tanks do works or create odor problems?

Can I build a tank from thick polyethylene sheet, hot air welded?
Any experience?

Paolo Zini

Paolo Zini wrote:
I know, there are lots of holding tank, made of good rotomolded
polyethylene...
But if space is small and irregular, the standard tanks may not fit...

epoxy-fiberglass tanks do works or create odor problems?


SFWIW, I custom built an epoxy/knitted glass holding to fit an odd ball
shape.

Had some old fashioned coal tar epoxy tank resin which was used to coat
inside of tank.

Probably wasn't necessary, but had to use the coal tar resin for
somethingG.

HTH

Lew

Paolo Zini wrote:

I know, there are lots of holding tank, made of good rotomolded
polyethylene...
But if space is small and irregular, the standard tanks may not fit...

I'll bet you can find one here that will: http://www.ronco-plastics.com
They make top quality tanks for a very reasonable price and have more
than 400 shapes sizes to choose from, including over 100 non-rectangular.

epoxy-fiberglass tanks do works or create odor problems?

That depends on how well made they are. But even well made, they're much
heavier than poly tanks...and if you go that route, you'll also have to
install a gauge. 'Cuz federal law requires that all waste tanks have
some means of determining when they're at least 3/4 full, to prevent
overflow of raw sewage out the vent that pollute. If the tank wall is
translucent, and easily accessible for visual inspection, that's enough
to meet the requirement. But if it's either made of a material that
doesn't allow you to see the level in side, or in a location that makes
visual inspection impossible--or so inconvenient as to be impossible--a
gauge of some kind is required.

Can I build a tank from thick polyethylene sheet, hot air welded?
Any experience?

Easier said than done. Hot air welding won't work...it has to be heat
welded, blending new poly with melted edges of the tank walls. The
integrity of the tank is dependent upon the integrity of the welds...and
it takes a bit of skill/practice to know how much new material and how
much edge of tank wall to melt to run together so that they become a
single mass that actually actually becomes part of the walls and
reinforces the corners, without bubbles or weak spots. Walls should be
at least 3/8" thick, btw...to support the weight of the contents without
bulging or flexing, which would put additional stress on the welds.

IMO, you're MUCH better off buying rotomolded tanks for water and waste
than making them.

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1