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<DIV>Thanks you for the response. Decades would be wonderful but in todays
world is very unrealistic, and in the environment here impossible. Here at
5/6 feet above sea level 80 degrees F plus 100 percent humidity and
constant salt even stainless steel does no last. Broken coral aggregate
and foraminiferous sand simply do not make a concrete that can tolerate fire.
WWII armored tanks do not even exist as rust spots on the reef. On a
coral atoll there is nothing to use except calcium carbonate and humus.
Everything else is imported at a cost many can not pay.</DIV>
<DIV>In reality here 2/3/4 years is a miracle unless built to standards no
one can afford. A solar reflector would be corroded beyond use in 12 to 24
months.</DIV>
<DIV>They were tried and trashed, after the steel legs rusted and collapsed
leaving the reflector propped up on pieces of wood. The condensed moisture in
say gas or kerosene from simple daily expansion and contraction rusts out tanks
in couple years. </DIV>
<DIV> </DIV>
<DIV>Without a cost effective viable alternative people will go back to the 3
stone fire. It worked for grandma, it worked in the 19th century and it worked a
thousand years ago. </DIV>
<DIV>Michael N Trevor</DIV>
<DIV>Majuro</DIV>
<DIV>Marshal Islands</DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=doseifert@googlemail.com
href="mailto:doseifert@googlemail.com">Dr.-Ing. Dieter Seifert</A> </DIV>
<DIV><B>Sent:</B> Tuesday, May 13, 2014 2:41 AM</DIV>
<DIV><B>To:</B> <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV><B>Subject:</B> [Stoves] question about longevity Re: concrete rocket
stoves</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoNormal><SPAN lang=EN-US style="mso-ansi-language: en-us">Dear
Michael N Trevor,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="mso-ansi-language: en-us"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US style="mso-ansi-language: en-us">Are we not
supposed to strive for a durability of our cookers in the range of decades to
avoid that there is a continuous production of waste? So I want e.g. to pass my
parabolic solar cooker to my grandchildren as it is not degraded during many
years of intensive usage.<SPAN style="mso-spacerun: yes"> </SPAN>And one
day, after decades, they may repair it or recycle it.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="mso-ansi-language: en-us"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US style="mso-ansi-language: en-us">With kind
regards<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="mso-ansi-language: en-us">Dieter<o:p></o:p></SPAN></P>
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<BR><BR><BR>Am 14.05.2014 04:37, schrieb Michael N Trevor:<BR></DIV>
<BLOCKQUOTE cite=mid:08C4D07756FB4F189DF76D4CFD51CB11@cmipc
type="cite">Re-asked-- <BR><BR><BR>There are wide variety of rocket stove
designs shown on various YouTube movies. <BR>Primarily variations on stacked
hollow blocks or 6 gallon buckets with a removable PCV elbow. <BR>both types
have the distinct advantage of being simple inexpensive and quick to make.
<BR><BR>However does anyone have any actual longevity information? <BR>For
instance Quickrete in the 60 pound bag is a nice mix of cement, hard sand and
nice small pebbles which with should make a nice <BR>dense concrete. As
configured the sample stove has about a base 2 inches thick, and 4 inch
walls. Could this be expected to last a few weeks, <BR>a few months or even a
year or more. The bag of cement here cost a little over 7.00 with tax. With
propane costing a 1.00 plus even 2.00 <BR>Return on investment is a week,
however making a new stove weekly just does not cut it. Some might
it consider if the stove lasted 6 months. <BR>If it can be a year or so it
could be feasible especially if it they were already made and available.
<BR>This issue of longevity could be important. I will be able to answer
this myself in the future as I all ready made two. But if some one can
answer in advance it would be appreciated. <BR><BR><BR>Michael N Trevor
<BR>Majuro <BR>Marshall Islands
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