[Rhodes22-list] Dry Ice

[Roger Pihlaja]

Ben,

Yor're welcome!  Now, if I could just convince some employer that chemical
engineers are nice to have around...

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Ben Schultz" <BenS@ApproSystems.com>
To: <rhodes22-list@rhodes22.org>
Sent: Thursday, November 14, 2002 12:08 PM
Subject: Re: [Rhodes22-list] Dry Ice


> Roger,
>
> Your materials science knowledge is absolutely amazing.  We're fortunate
to
> have your contributions to the list.  Skimming the FAQs emphasizes the
> point!
>
> Thanks.
> Ben
>
>
> Roger Pihlaja wrote on 11/12/02 15:35:
>
> Bill,
>
> There is just a slight material of construction problem associated with
> using dry ice in the onboard ice chest + the safety issue you already
> alluded to.
>
> The interior liners & ice buckets of the R-22 on-board ice chests are made
> from ABS plastic.  At -70 deg C, the temperature of dry ice is well below
> the point at which this plastic gets very brittle.  Any mechanical loading
> on the liner from the weight of the food, wave action, or even residual
> thermal stresses left over from the compression molding process used to
> fabricate the liner may cause it to crack or even shatter.  If you are
going
> to attempt to use dry ice as the refrigeration source, then place the dry
> ice inside of a small polystyrene foam ice chest 1st (these ice chests are
> frequently sold in bait shops for carrying minnows) & then put the small
> foam cooler into your on-board ice chest.  The dry ice will not harm the
> polystyrene foam & it will provide sufficient insulation to protect your
> expensive on board ice chest from the extreme cold.
>
> As far as the intrinsic safety hazard of smothering gaseous carbon
dioxide,
> you are on your own.  Carbon dioxide is more dense than air & will tend to
> collect in any low spot.  I leave it to you to decide if you want to have
a
> continuous source of colorless, odorless, smothering gas down below in
your
> galley.  Personally, I keep my dry ice in the lazzarette compartment.
>
> FYI, dry ice is also a significant thermal burn hazard.  Never touch dry
ice
> with your bare skin.  It will burn you in a fraction of a second!  Always
> handle it with gloves or some sort of a tool like pliers or tongs.
>
> By the way, these days we use a Stanley wide mouth stainless steel thermos
> bottle to hold dry ice + ice cream when we cruise.  The vacuum dewar
bottle
> will hold a pint of ice cream + dry ice rock hard for several days.  The
> Stanley thermos bottles are almost indestructable, the dry ice won't harm
> the stainless steel, & they are much easier to pack than a foam ice chest.
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
>
> ----- Original Message -----
> From: "Ben Schultz" <BenS@ApproSystems.com>
> To: "The Rhodes 22 mail list" <rhodes22-list@rhodes22.org>
> Sent: Tuesday, November 12, 2002 11:46 AM
> Subject: RE: [Rhodes22-list] Dry Ice
>
>
> > I found another good alternative at the Annapolis boat show.  They come
as
> > pieces of paper, perferated into small squares.  you soak the pages in
> > water, which cases each little square to swell into a bulge.  Then, you
> > freeze them.  Supposedly, they stay cold for days once they are in the
ice
> > chest.  I'll give you a review once I have a chance to spend a whole
> weekend
> > aboard.
> >
> > Ben
> >
> > -----Original Message-----
> > From: Bob [mailto:romin@csionline.net]
> > Sent: Thursday, November 07, 2002 06:49
> > To: The Rhodes 22 mail list
> > Subject: Re: [Rhodes22-list] Dry Ice
> >
> >
> > Hello Bill
> > I have to get one! Where can I buy one of these?
> > Bob
> > ----- Original Message -----
> > From: "Bill Effros" <bill@effros.com>
> > To: "R22 List" <rhodes22-list@rhodes22.org>
> > Sent: Wednesday, November 06, 2002 3:42 PM
> > Subject: [Rhodes22-list] Dry Ice
> >
> >
> > I purchased a dry ice maker at the beginning of this season that could
be
> of
> > interest to anyone thinking of short term cruising.
> >
> > It cost $125, which I though was a bit pricey for what it is--little
more
> > than a fitting for a CO2 tank, and a cloth sack that can be attached to
> the
> > fitting via a hose clamp.
> >
> > However, it does work.  And a pound of dry ice in the top section of the
> ice
> > box will keep the bottom section as cold as a home refrigerator all day
> and
> > night with just a little effort.
> >
> > CO2 is not expensive and can be purchased at welding supply companies.
> The
> > tank must have a siphon.  That lets out 5 lb. tanks.  25 lb.s is the
> minimum
> > tank size.  The efficiency is 20-25%.  A 25 lb. tank will fit in the
> > lazarette, however, remember it weighs more than 25 lbs when full, and
> gets
> > lighter as you use the gas.
> >
> > If you buy some dry ice before you start, and replenish as you go you
> could
> > probably stretch it out to a week of cruising if you are careful.  Some
of
> > the dry ice would be stored along with food in coolers as Roger has
> > described in the past.
> >
> > I don't know about the safety factor, however my boat is less than air
> > tight, and I have the pop-top up most of the time I'm on board.
> >
> > Bill Effros
> > _________________________________________________
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