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Old 06-11-2019, 04:13 PM   #1
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Default The blow myth

My boss wanted me to blow out an MCC. I asked when it could be shut down and was told no, do it hot. It’s in a saw mill and the dust in there is very fine. Def could be explosive dust if stirred up just right. It’s prolly really dry dust so may not be conductive. I will not take the chance. He said it was a myth that blowing dust into electrical apparatus could be dangerous.

It’s all good, he’s not a jerk and said he will blow it out himself. So my question to yawl is this: have you ever actually witnessed an occurrence or the aftermath of an occurrence for yourself. Hearing about one doesn’t count unless you are somehow very close to the source. Thanks

Also I’d be happy to hear others thoughts on the matter either pro or con.

Thanks for your time.


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Old 06-11-2019, 04:21 PM   #2
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I 100% know that dust is explosive, having been in a dust explosion myself. However, that incident had an ignition source. I don't think you would have a problem, but it's good to be on the safe side.
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Old 06-11-2019, 05:02 PM   #3
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A hazardous location?...

Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.
https://literature.rockwellautomatio...p003_-en-p.pdf
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Old 06-11-2019, 05:23 PM   #4
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Dust +air+ ignition source = flash.
Dust is dry as per you.
Air is supplied by blowing out panel
Ignition source is the question? A MCC in a sawmill probably has large contacts for motors that can arc when stopping or starting that would be my maybe it could happen.

Take a handful of baking flour and throw it into a campfires flame hard so it spreads out and watch the flash.

Good job being safe, to bad the boss won't listen

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Old 06-11-2019, 05:33 PM   #5
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Can't static electricity build up from compressed air moving over a surface?

I would use my right to refuse unsafe work there in a heart beat... the MCC should be shut down to work in it regardless of the dust... but that's just me...

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Old 06-11-2019, 05:43 PM   #6
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Hate to say it because I've used compressed air before on smaller pieces of equipment but a vacuum is the way to go. Use it to get all you can and then blow out the tight areas and suck that up too.


Tim.
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Old 06-11-2019, 05:47 PM   #7
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Some get confused because, why doesn't road dust explode? It's not combustible material like flour or wood dust.

Training video (animated, no actual footage)


Lab Demo:


Fairly convincing:

https://www.youtube.com/watch?time_c...&v=4hS6IGO2tdA
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Old 06-11-2019, 05:50 PM   #8
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I’m with cowboy, open up the contacts on the motor that runs the headsaw when they hang it in a log, and you have ignition Houston.
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Old 06-11-2019, 06:03 PM   #9
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It's scary how much Nema 1 gear is in sawmills.
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Old 06-11-2019, 06:39 PM   #10
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I thought this was going to be a thread about cocaine.
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Old 06-11-2019, 06:48 PM   #11
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Quote:
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I thought this was going to be a thread about cocaine.

Same here! Was told a story about a guy in the 80's who in his front shirt pocket use to keep a piece of copper tubing, the kind used to connect fridge ice makers full of cocaine and he'd take sniffs throughout the day.
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Old 06-11-2019, 07:43 PM   #12
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Quote:
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I thought this was going to be a thread about cocaine.
Me too. Disappointed in this thread , and the strippers thread too
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Old 06-11-2019, 08:34 PM   #13
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Me too. Disappointed in this thread , and the strippers thread too
Especially the strippers thread.
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Old 06-11-2019, 08:48 PM   #14
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Especially the strippers thread.
I really expected more from Sabrina
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Old 06-11-2019, 08:53 PM   #15
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Thanks for your thoughts on the subject.


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Old 06-11-2019, 08:55 PM   #16
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Quote:
Originally Posted by splatz View Post
Some get confused because, why doesn't road dust explode? It's not combustible material like flour or wood dust.

Training video (animated, no actual footage)

]
Thanks for taking the time to find those. I never even considered looking for. Vids




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Old 06-11-2019, 08:58 PM   #17
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Quote:
Originally Posted by just a cowboy View Post
Dust +air+ ignition source = flash.
Dust is dry as per you.
Air is supplied by blowing out panel
Ignition source is the question? A MCC in a sawmill probably has large contacts for motors that can arc when stopping or starting that would be my maybe it could happen.


Cowboy
Thanks for mentioning that. I was more concerned with possible shorting of the bus’s bars through dust piling up on them. I hadn’t considered the much more likely contacts as source of ignition.




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Old 06-11-2019, 09:05 PM   #18
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Quote:
Originally Posted by Flyingsod View Post
Thanks for your thoughts on the subject.


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fwiw, I wouldn't do it live. Most MCCs are 600V here, assuming yours is 480.

If you have the door open live, you'd have to have arc flash data and appropriate PPE.

Edit: The PPE limits the injury to second degree burns !
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Old 06-11-2019, 09:09 PM   #19
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Quote:
Originally Posted by emtnut View Post
fwiw, I wouldn't do it live. Most MCCs are 600V here, assuming yours is 480.

If you have the door open live, you'd have to have arc flash data and appropriate PPE.

Edit: The PPE limits the injury to second degree burns !
Second degree burns are blisters. Imagine someone having sunburn so bad they got blisters from it.
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Old 06-11-2019, 09:35 PM   #20
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Inferno: Dust Explosion at Imperial Sugar

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