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<div class="moz-cite-prefix">G'day All,<br>
<br>
Variable Volume (VV) storage has a number of advantages over
Compression (C), which at 20 psi will not give you much advantage
anyway. VV can be plastic, avoiding the shrapnel problem, and
saves the cost/complication/energy consumption of C. You also get
a simple visual indication of gas production/use with VV. Several
members of this list can probably verify that with a plastic
storage you get a hole and a rapid flare of gas rather than a
large explosion<br>
<br>
When we were talking about storing biogas at our University
research site the maintenance supervisor said we would have to use
steel containers and I thought to myself that I would rather stand
alongside a plastic VV storage during a fire than be anywhere near
a steel cylinder.<br>
<br>
Happy Digesting<br>
<pre class="moz-signature" cols="72">HOOROO
Mr Paul Harris
Visitor to The University of Adelaide</pre>
On 30/10/2013 8:00 AM, David wrote:<br>
</div>
<blockquote cite="mid:527028F2.6020900@h4c.org" type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<br>
<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
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 moz-do-not-send="true"
href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
moz-do-not-send="true" 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 moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://bahai.us/">http://bahai.us/</a></div>
</div>
</code></div>
</div>
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<pre wrap="">_______________________________________________
Digestion mailing list
to Send a Message to the list, use the email address
<a class="moz-txt-link-abbreviated" href="mailto:Digestion@bioenergylists.org">Digestion@bioenergylists.org</a>
to UNSUBSCRIBE or Change your List Settings use the web page
<a class="moz-txt-link-freetext" href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a>
for more information about digestion, see
Beginner's Guide to Biogas
<a class="moz-txt-link-freetext" href="http://www.adelaide.edu.au/biogas/">http://www.adelaide.edu.au/biogas/</a>
and the Biogas Wiki <a class="moz-txt-link-freetext" href="http://biogas.wikispaces.com/">http://biogas.wikispaces.com/</a>
</pre>
</blockquote>
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