quote:

Anhydrous HF leaked from the liquid valve as two workers were on top preparing to connect a Anhydrous Hydroflouric ISO Tank for offloading. They accidentally fully opened the quarter turn valve. An estimated 8 tons of HF was released. 5 people including the 2 workers perished, 18 responders, workers, reporter wound-up in the hospital, almost 3000 villagers from 2 villages downwind of the facility were treated for irritation, exposure.

JFairfax posted:

Darth Freddy posted:

Drove up to a location to see this.



Note the rig was also moving while he was climbing in there. Also no hard hat or fall arrest harness.

Darth Freddy posted:

Drove up to a location to see this.



Note the rig was also moving while he was climbing in there. Also no hard hat or fall arrest harness.

OhsH posted:

So uh, how careful should i be with this bottle of 12 % hf acid i use for work??

Angela Christine posted:

Adding a letter 'l' to the end of the identity string is superior to timg for imgur pictures.

Raygereio posted:

In all seriousness: Do you have a HF treatment & spill kits available and do you know how to use them?

Leperflesh posted:

Today I saw an elderly man wandering around on his peaked roof blowing leaves off with a leaf blower. He had no safety equipment whatsoever, and appeared to be alone.

OhsH posted:

Not in this work van

VectorSigma posted:

oh it's in a vehicle even better

OhsH posted:

Not in this work van

buttcoinbrony posted:

12% is pretty strong so don't try to chug it all at once, and make sure you've got some food in your stomach.

Zopotantor posted:

That's not what you do with hydrofluoric acid.

OhsH posted:

Carpet cleaning can be fun when i know what i am working with

Raygereio posted:

Don't see what's superior about it. An timg I can restore to the original size, or have it fill the browser window.

Leperflesh posted:

I like being able to click to somewhat-embiggen, or click the little size label to toally-embiggen, both in-place rather than in a new tab or navigating to imgur, though.

Judge Schnoopy posted:

Smoke came in today...

We thought the server room windows looked dirty, but on closer inspection our data center was filling with smoke. Ran in with fire extinguishers to kill whatever it was before the fire suppression system sunk our whole operation.

It was coming in from the dehumidifier on the wall which hasn't been turned on in 8 years. Odd, especially because the smoke didn't smell like burning and was white instead of black.

Somebody knocked on the tech room door and said the men's bathroom was full of smoke too (no idea why this falls under tech's purview but it seems the norm for this thread). It was coming in from a water heater in a closet, was thick, but again was white and didn't smell bad.

Fire alarm is pulled, everybody evacuates, but the fire department doesn't send a truck. Just a fire marshal and a city worker. Turns out the city was doing sewer leak testing by forcing smoke in the pipes, and the traps in our building were dry letting the sewer smoke come right in. The city points out that we have a much larger problem that before the test we've probably been letting sewer gas in to our building for who knows how long.

City also says they came by and personally spoke to somebody in our building to let them know the test was happening, to make sure the traps had water, and not panic if there was smoke. Reviewing the security video footage, the city worker came in, dropped a flier on the unattended front desk, sat down for 5 minutes, then walked out without speaking to anybody. No word on if the city is going to charge us for the emergency call but I think we're covered if they do.

The dehumidifier has a water drain on it that wasn't sealed properly when it was shut off, which is why we had smoke in our data center.

The end result was that we had a good fire safety drill and exposed the fact that we are likely taking in sewer gas for who knows how long.

c0ldfuse posted:

What purpose necessitates driving around in a van full of HF?

OhsH posted:

"Full of" might be an overstatement and i already said i clean carpets

Phanatic posted:

What the hell do you use HF for in cleaning carpets? It's usually used to etch glass, to clean oxides off of stainless steal, to process hydrocarbons, and so forth. It's not usually turned to for stain removal, you'd want oxidizers or organic solvents for that.

Big Steveo posted:

I have been doing a lot of work recently on 33KV and 66KV ACCB's (Alternating Current Circuit Breakers), modifying the protection on them - notably Pilot Wire Protection between substations.

Pilot Wire works by monitoring the current on both ends of a High Voltage feeder via Current Transformers and use a fibre optic connection between substations. Two relays "talk" to each other to compare their values and operate the ACCB on set parameters. As you said the ACCB's rely on a separate 120v DC supply to supply the control circuits - typically; Spring Charging Motor, Closing Circuit, Tripping Circuit 1, Tripping Circuit 2, SCADA circuit. each circuit is individually fused. Most newer ACCB's have more than one trip coil as a backup if the first one fails.

The work I have been doing has also added a MTA (Multiple Trip Automatic) relay which is a relay that pick up and trips multiple ACCB's within substation - essentially tripping out all possible sources of supply to that ACCB.

So in a scenario that a ACCB loses control power and remains closed (Substation B), power will still flow through it nicely - sends an alarm to the operating centre saying control power is lost. If a fault situation occurs, earth fault for example (fallen wire), a command to trip out the feed comes from Substation A to Substation B. The ACCB at Substation A will trip fine - however Substation B can not trip and is still technically feeding a fault.After a predetermined time if the ACCB at Substation B still fails to trip, the MTA is activated and trips all the ACCB's inside Substation B that supplies power to the faulty ACCB.

I have been apart of upgrading the protection in about 13 consecutive substations, replacing electromechanical relays to electronic. Testing is very stringent and the most satisfying one to witness is to remove a tripping supply from a ACCB and simulate a fault (MTA test). Listening to 7 33KV ACCB's all go BANG at the same time is fun.

So thankfully, not broomstick is required.

Nuclear Pogostick posted:

personally I like white lithium grease, that stuff's pretty good

Phanatic posted:

What the hell do you use HF for in cleaning carpets? It's usually used to etch glass, to clean oxides off of stainless steal, to process hydrocarbons, and so forth. It's not usually turned to for stain removal, you'd want oxidizers or organic solvents for that.

Phanatic posted:

The Ir-192 ones are spooky poo poo. There's like almost a half-dozen orphan source incidents where the Ir-192 source breaks off and gets lost and some poor dude finds it and sticks it in his pocket.


http://www-pub.iaea.org/MTCD/publications/PDF/Pub1101_web.pdf


At the time of the incident, the source contained 1.4 terabecquerels of Ir-192. Guy took a 15 Gray dose to his femur, 25-30 Grays to his sciatic nerve. The report's fascinating, but also chock full of NMS medical imagery of massive tissue necrosis.

ncumbered_by_idgits posted:

Tech was welding on the head with no-one else around and burned down several acres of unpicked corn.

Three-Phase posted:

You might not be allowed to answer this, but are you using SEL (Schweitzer Engineering Laboratories) relays?

Because GE Multilins are flimsy pieces of crap. I've seen so many issues with GE meters and relays it's not funny.


Don't forget contact cleaner. For... well... contractors.

ncumbered_by_idgits posted:

OSHA doesn't apply in this case but I think this is the appropriate place.

The implement dealer came out to work on my father in law's combine yesterday. Tech was welding on the head with no-one else around and burned down several acres of unpicked corn. FIL called 911 three times, never did get an answer and had to drive to town to find someone on the fire department.

God I miss the farm, that's more excitement than I've seen in a long time.

OhsH posted:

Rust removal!

zedprime posted:

HF in consumer carpet cleaner sounded pretty far fetched, so Google did not disappoint when it turned up Whisk Rust Stain Remover, an HF solution between 1-2% available at grocery, mass merchants, and other retailers nationwide. Just like they used to make in 1947! SDS

Although I'm kind of interested in what the guy posting actually has, 12% sounds like it'd be a little beefier for the carpet's integrity. I wouldn't doubt a story about the owner knowing a guy and getting pickling grade HF on the side.

Leperflesh posted:

Magnets?

quote:

copper oxides

Flash Gordon Ramsay posted:

Giant scaffolding collapse in Houston today. I guess when one section fails it all fails. The video is pretty amazing for just how much collapsed scaffolding there is.

http://www.cnn.com/2015/10/16/us/houston-scaffolding-collapse/index.html

Methylethylaldehyde posted:

Your smartphone and a piece of black electrical tape can make a decent gieger counter. Worried about your testicles being cooked and your bone marrow destroyed? There's an App for that!.