[meteorite-list] Water cutting question

From: Mendy Ouzillou <ouzillou_at_meteoritecentral.com>
Date: Tue, 20 Nov 2012 15:58:40 -0800 (PST)
Message-ID: <1353455920.15271.YahooMailNeo_at_web126201.mail.ne1.yahoo.com>

Seems to me that if you recirculate the water, all that out-gassing is for naught as the blade will re-aerate the water.

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>Mendy
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>>________________________________
>> 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 Tue 20 Nov 2012 06:58:40 PM PST