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<br>
Jacob,<br>
<br>
Take 2,<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/29/2013 11:08 AM, Jacob Douenias
wrote:<br>
</div>
<blockquote
cite="mid:CAK9JyBA-5apcJGkgRPoehY40w2cxy6WEvq9WiAhzvNi_58YWCQ@mail.gmail.com"
type="cite">Hi all! <br>
<br>
Excited to join this group. I am a researcher working at carnegie
mellon university in pittsburgh.I am working on a startup where we
are making biogas at home and biologically purifying this gas.<br>
<br>
Our gas composition at the end of our system is comprised of about
80% methane and 20% oxygen. We are concerned about the storage and
possible compression of this gas due to the presence of oxygen in
the gas. I know that 80% methane is well above the upper explosive
limit of methane (our working conditions are 15-20psi for final
gas compression and 60-80 degrees farenheight). I know it is bad
practice to have oxygen mixed with combustible gas but at our
composition should we worry about safely compressing this mixture
to a low pressure (15-20psi) and storing it in gas cylinder? I
would really love to hear what you think as I am just an architect
who happens to read a lot about biochem. </blockquote>
<br>
<br>
The upper limit of flammability for methane in air is of course
about 15%. I took a bit of time between tasks to look it up, and in
pure oxygen, the upper limit is 61%. (The lower limit is about the
same in either case: ~5%.) There is a formula proposed by
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Zabetakis
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<![endif]--> which indicates-- if I've done my figgers correct-- that at
20 PSI it should increase to perhaps 63% methane in oxygen. But
note: that is an extrapolation, not a test result. And I would not
call 80% "well above" that extrapolated limit.<br>
<br>
I have to say, that particularly if I had children in the house--
you did say "biogas at home", and you did say "we"-- I would not
want to take any implied risks. In the case of the information I
have just given you, for example, maybe it's true, maybe I made a
mistake. Maybe you didn't measure the gas ratio correctly and maybe
it will change, if the presumed algae get frisky. Maybe, maybe.<br>
<br>
If it were me, I would have a tendency to look at the gas cylinder
and wonder whether I was unintentionally planning on making a bomb
with its own built-in shrapnel, and then I would begin to wonder how
I might store the gas some other way, such that if the marginally
unthinkable did happen, nobody would be likely to be nearby, and
nothing sharp and glittering would be hurled hither and thither as a
result.<br>
<br>
<br>
<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style="font:Georgia" ;=""><span style="font-size:110%;">David
William House<br>
</span>
<div style="padding-left:3em;font-size:80%;">"The Complete
Biogas Handbook" <code><a href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
</code></div>
<code>
<div style="padding-left:2em;">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left:2em;font-size:80%;">(Rumi, a
Persian mystic poet, quoted in <em>Delight of Hearts</em>,
p. 77) <br>
<br>
<a class="moz-txt-link-freetext" href="http://bahai.us/">http://bahai.us/</a></div>
</div>
</code></div>
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