This is an interesting comment: "A student who didn't give his name said he and a teacher smelled smoke before the explosion."
Evidently is was already burning. I wonder what actually exploded? Gas leak? Chemicals? Seems to have been quite a bit of damage from just dust even in a good sized commercial DC. There was not even any mention that the DC was running at the time. I hope you see the follow-up of the investigation so we can see what did really happen.
I am almost certain the cause will be a carelessly-disposed-of DuMaurier.
Employing a shop teacher named Danvers was never going to end well.
The conspiracy theorist are already at work on this one though. Someone said they say an elderly woman with a G-suit dabbing her face with make up.
UA100, reporting many miles from the Sinai...
"Edwin Pawlowski" wrote in news:xLg1e.14567$ snipped-for-privacy@newssvr17.news.prodigy.com:
I've seen stuff in well-supervised classes that still make me really nervous.
The fellow sharpening chisels in the disk sander (connected to the DC) comes immediately to mind.
There will be a very complete after-incident investigation. The chances of the details of the report making the news are pretty small.
Every fire department leader I've ever met, or seen on the news, impressed me as a pretty serious, caring person. I'm _very glad_ they are around.
Patriarch
I've seen 'em too. In my previous life as a h.s. science teacher I was often called on to "sit in on Mr. Blurfles class" during my 'conference' period. I can remember, on one occasion, I spotted Mr. Blurfle outside in the alley behind his wood shop pouring water into the large metal plenum of his dust collector. He told me he had to put out fires every once in a while because some student would drop his lit cigarette butt into the intake of the dc.
Larry
Half a million years ago, when I was in high school wood shop, in the winter time kids would hang out in a back corner of the shop smoking cigs near a collector port. If the teacher was coming the cig got tossed into the port. You may be right! Greg
Thank You, Thank You, Thank You!!
Max D. (retired Deputy Chief)
Really ? I'd expect it to be the perfect excuse to STOP THESE DANGEROUS WORKSHOPS IN OUR SCHOOLS (Think of The _Children_)
Acetone.
Robatoy wrote in news: snipped-for-privacy@nr-tor01.bellnexxia.net:
And things had just settled down a bit, troublemaker.
;-)
Patriarch
Someone huffing near an inlet!
I live near Boulder - the place where they pulled all the motors from the woodworking equipment.
On Sat, 26 Mar 2005 17:14:05 GMT, "Edwin Pawlowski" scribbled:
This is weird. According to "Le Soleil de Montreal":
"Un representant du Service des incendies de la CUM a declare que la cause de l'explosion dans l'atelier d'ebenisterie a l'ecole Cavelier-de-Lasalle est une etincelle generee par l'electricite statique dans la tuyauterie en plastique de polychlorure de vinyle. Le service des incendies procedera a des inspections dans toutes les ecoles de la region pour s'assurer que ces dispositifs soient bien mis a terre, ce qui permettra d'eviter d'eventuelles deflagration. De sa part, la CSST reccommande aux entreprises d'ouvrage de bois de verifier que leur depoussiereurs soient pourvus de dispositifs de mise a terre pour eviter les deflagrations du meme genre."
Rough translation:
A representative of the Montreal Urban Community fire department declared that the cause of the explosion in the furniture-making shop at the Cavelier-de-Lasalle school is a spark generated by static electricity in the PVC plastic piping. The fire department will proceed to inspect all schools in the region to ensure that these systems are well grounded, which will allow avoiding eventual deflagrations. On its part the CSST [the Quebec equivalent to OSHA] recommends to all woodworking enterprises to verify that their dust collector systems be provided with grounding systems to avoid deflagrations of the same kind.
It seems that we have the first documented case of static sparks causing an explosion in dust collection systems.
Luigi Replace "nonet" with "yukonomics" for real email address
... snip ...
I wonder what evidence points to such a thing, sufficient to distinguish it from a burning cigarette butt having been sucked into the system, for example.
Luigi Zanasi wrote in news: snipped-for-privacy@4ax.com:
And any other day of the year, I MIGHT believe you.
Patriarch
distinguish it
Well, they may have looked for a cigarette and not found one, though I'd not be inclined to draw too certain a conclusion from that.
OTOH I used to work with some prototype pneumatic conveyors. We used PVC pipe and got some HUGE sparks off of ungrounded systems. That translates to high voltage (several hundred thousand volts) NOT high current. I think the ignition source for rare but spectactular grain elevator explosions is also typically attributed to a static spark.
On Fri, 01 Apr 2005 14:36:04 -0600, Patriarch scribbled:
;-)
Ah well, I only caught two "poissons d'avril", "April fish" as they are called in French. Eisan is still the king.
For the record, there is no such newspaper as the "Soleil de Montreal", and no news yet as to the cause of the explosion. My bet goes for a Player's or Export "A" rather than a duMaurier.
Luigi Replace "nonet" with "yukonomics" for real email address
Most of those of which I've read have been due to electrical shorts -- most often sparks from one of the grain-moving motors. Much more current and energy in those sparks than in a static spark.
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