[meteorite-list] Water cutting question

From: Robert Verish <bolidechaser_at_meteoritecentral.com>
Date: Wed, 21 Nov 2012 01:02:46 -0800 (PST)
Message-ID: <1353488566.51610.YahooMailClassic_at_web39305.mail.mud.yahoo.com>

Hello Mendy, Mike, Ed, and All,

I've been told that "chloramine" doesn't out-gas like chlorine does.
We in California have to cognizant of this additive to our drinking water.

http://www.purewaterproducts.com/articles/removing-chloramines
http://www.chloramine.org/chloraminefacts.htm

This Subject comes up every so often on this List, and the oft-repeated disclaimer is "that readers new to the List should run a search in the List-Archives" on this subject for a review of past comments and observations.

Bob V.

--- On Tue, 11/20/12, Mendy Ouzillou <ouzillou at yahoo.com> wrote:

> From: Mendy Ouzillou <ouzillou at yahoo.com>
> Subject: Re: [meteorite-list] Water cutting question
> To: "Michael Mulgrew" <mikestang at gmail.com>, "Ed Deckert" <edeckert at triad.rr.com>
> Cc: "meteoritelist meteoritelist" <meteorite-list at meteoritecentral.com>
> Date: Tuesday, November 20, 2012, 3:58 PM
> Seems to me that if you recirculate
> the water, all that out-gassing is for naught as the blade
> will re-aerate the water.
>
> >
> >Mendy
> >
> >
> >
> >
> >
> >
> >>________________________________
> >> From: Michael Mulgrew <mikestang at gmail.com>
> >>To: Ed Deckert <edeckert at triad.rr.com>
>
> >>Cc: meteoritelist meteoritelist <meteorite-list at meteoritecentral.com>
>
> >>Sent: Tuesday, November 20, 2012 3:23 PM
> >>Subject: Re: [meteorite-list] Water cutting
> question
> >>
> >>Ed and list,
> >>
> >>I do not know of an exact way to calculate, but a
> few minutes at
> >>around 29 inches Hg of vacuum (sea level),
> especially on a hot plate
> >>and with a little aggitation, will remove about all
> of the dissolved
> >>gasses.
> >>
> >>Michael in so. Cal.
> >>
> >>On Tue, Nov 20, 2012 at 2:45 PM, Ed Deckert <edeckert at triad.rr.com>
> wrote:
> >>>
> >>> Hi Michael,
> >>>
> >>> Is there a method to calculate how long to
> leave a specific volume of water
> >>> at a specific vacuum (inches Hg) to ensure that
> it is degassed?
> >>>
> >>> Thanks,
> >>> Ed
> >>>
> >>> ----- Original Message ----- From: "Michael
> Mulgrew" <mikestang at gmail.com>
> >>> To: "Pete Pete" <rsvp321 at hotmail.com>
> >>> Cc: "meteoritelist meteoritelist" <meteorite-list at meteoritecentral.com>
> >>> Sent: Tuesday, November 20, 2012 5:08 PM
> >>> Subject: Re: [meteorite-list] Water cutting
> question
> >>>
> >>>
> >>>> Pete and list,
> >>>>
> >>>> Unfortunately the method you use does not
> effectively de-gas water, as
> >>>> exposure to the atmosphere will allow
> atmospheric gasses to continue
> >>>> to dissolve into solution; it is the
> atmospheric gasses that cause
> >>>> water to be corrosive.? To de-gas water
> you can:
> >>>>
> >>>> - Boil it
> >>>> - Sonicate under vacuum
> >>>> - Use a vacuum degasser
> >>>> - Bubble He through it
> >>>> - Etc.
> >>>>
> >>>> But unless you store your degassed water in
> an
> air-tight container
> >>>> gasses will begin to dissolve back into
> solution almost immediately.
> >>>>
> >>>> Michael in so. Cal.
> >>>>
> >>>> On Tue, Nov 20, 2012 at 1:47 PM, Pete Pete
> <rsvp321 at hotmail.com>
> wrote:
> >>>>>
> >>>>>
> >>>>> I do!
> >>>>>
> >>>>> I fill all my old distilled four litre
> jugs with tap water and let them
> >>>>> sit with the caps off for about seven
> days.
> >>>>> A chemist buddy of mine said it takes
> about 24 hours for any chlorine and
> >>>>> other gasses to dissipate, but with the
> narrow neck and relatively small cap
> >>>>> opening, to be prudent, after a couple
> of days I give it each jug a shake
> >>>>> and leave it again for a few more.
> >>>>>
> >>>>> Cheers,
> >>>>> Pete
> >>>>>
> >>>>>>
> From: mikestang at gmail.com
> >>>>>> Date: Tue, 20 Nov 2012 11:17:37
> -0800
> >>>>>> To: raremeteorites at yahoo.com
> >>>>>> CC: meteorite-list at meteoritecentral.com
> >>>>>> Subject: Re: [meteorite-list] Water
> cutting question
> >>>>>>
> >>>>>> Adam, Mike, Carl, and list:
> >>>>>>
> >>>>>>
> >>>>>> The main constituents in "pure"
> water that cause corrosion are
> >>>>>> dissolved gasses. Does anyone
> de-gas their cutting water?
> >>>>>>
> >>>>>> Michael in so. Cal.
> >>>>>>
> >>>>>> On Tue, Nov 20, 2012 at 10:43 AM,
> Adam Hupe <raremeteorites at yahoo.com>
> >>>>>> wrote:
> >>>>>> >
> >>>>>> >
> >>>>>> > Who knows what chemicals lurk
> in tap water? By purifying it, you are >
> >>>>>> > removing the unknowns. I have
> >>>>>> > seen, for lack of a better
> term, Lawrencite disease creep up, >
> >>>>>> > especially with tap water that
> contains chlorine which seems to > accelerate
> >>>>>> > the
> >>>>>> > problem. I have had no issues
> cutting with purified water as long as
> >>>>>> > the contact time has been
> minimized. I guess purifying it could make
> >>>>>> > the water more acidic but I
> also monitor the PH level and have not >
> >>>>>> > seen
> >>>>>> > much of a difference.
> >>>>>>
> >
> >>>>>> > Other alternative coolants
> such as mineral oil, pure ethyl alcohol or
> >>>>>> > kerosine do not appeal to me
> anymore, mainly due to fumes, ignition or
> >>>>>> > the smell left in the
> specimens.
> >>>>>> >
> >>>>>> >
> >>>>>> > Adam
> >>>>>> >
> >>>>>> >
> >>>>>> >
> >>>>>> >
> >>>>>> >
> ________________________________
> >>>>>> > From: Carl Agee <agee at unm.edu>
> >>>>>> > To: meteoritelist
> meteoritelist <meteorite-list at meteoritecentral.com>
> >>>>>> > Sent: Tuesday, November 20,
> 2012 9:35 AM
> >>>>>> > Subject: [meteorite-list]
> Water cutting
> question
> >>>>>> >
> >>>>>> > I have been following the
> thread on cutting irons in water. My
> >>>>>> > question is, why distilled or
> purified water rather than tap water? I
> >>>>>> > was under the impression that
> purified water, i.e. ultrapure water, is
> >>>>>> > much more corrosive than
> mineralized water like spring water or tap
> >>>>>> > water. In fact, ultrapure
> water is so corrosive it is often used in
> >>>>>> > clean labs as a cleaning
> medium for surfaces. Also, the pharmaceutical
> >>>>>> > industry no longer uses
> stainless steel tubing for ultrapure water
> >>>>>> > because of corrosion -- they
> use Teflon or polyethylene instead I
> >>>>>> > believe. Wouldn't pure water
> be worse on iron oxidation than
> >>>>>> > "mineral" water? I can
> understand using pure water to cut down
> on
> >>>>>> > trace element contamination
> for geochemical srtudies, especially on
> >>>>>> > stones, but I don't see how
> this helps for keeping irons from rusting.
> >>>>>> > Also, while we are at it, what
> is the best blade for cutting irons?
> >>>>>> >
> >>>>>> > Thanks,
> >>>>>> >
> >>>>>> > Carl Agee
> >>>>>> > --
> >>>>>> > Carl B. Agee
> >>>>>> > Director and Curator,
> Institute of Meteoritics
> >>>>>> > Professor, Earth and Planetary
> Sciences
> >>>>>> > MSC03 2050
> >>>>>> > University of New Mexico
> >>>>>> > Albuquerque NM 87131-1126
> >>>>>> >
> >>>>>> > Tel: (505) 750-7172
> >>>>>> > Fax: (505) 277-3577
> >>>>>> > Email: agee at unm.edu
> >>>>>> > http://meteorite.unm.edu/people/carl_agee/
> >>>>>> >
> ______________________________________________
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Received on Wed 21 Nov 2012 04:02:46 AM PST