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<div class="moz-cite-prefix">On 12/10/2012 02:44 PM, jim mason
wrote:<br>
</div>
<blockquote
cite="mid:CAB5Uy2wq2PA0Kfgeiv5+m9ZgTs6T_vDKNv_UXbEBRetwQvjLDw@mail.gmail.com"
type="cite">
<div>the problem is typical operation is variable. during start
up you always go through a stoich point as you move air out of
the system and progressively make gas. even if you leave the
system full of gas on shut down, start up in the reactor can
pass lots of air until things get up to temp again. this can
easily result in a combustible mixture in the system.</div>
<div><br>
</div>
<div>we've found this to be a fairly significant operational
reality that needs to be addressed for regular users. similar
for the impact of backfires from the engine igniting the intake
stream. while things are "usually" ok, the marginal events can
be quite, umm, compelling . . . we've started adding more
pressure relief points where typically not needed to cover these
outliers. we're also looking to add a flame arrestor right at
the manifold to prevent backfires propagating.</div>
</blockquote>
<br>
Would a flame arrestor (basically a couple of layers of copper
screen or a layer of copper wool) just before the ESP be sufficient
to prevent propagation into the rest of the system? All that needs
is a pressure relief in the ESP for when there is a "marginal
event". If the throttle is before the ESP, not even a pop-off would
be needed, but the volume sounds like it would be a bit too large
that way.<br>
<br>
Dave 8{)<br>
<br>
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