Scenario 1:
I came in on a Saturday because I was swamped Friday. It was my very first time mixing chemical plating baths. The chemist just taught me and he asked if I needed help. I said no. It's not like I did. I was just very cautious. I poured stuff very slowly. Crap wouldn't dissolve. I didn't know the trick of heating crap up and doing it bit by bit with multiple beakers before mixing it in the giant tank. Well, I took all Friday night. I left at like 9pm. I came back Sat to do it.
This was before we had hired enough operators too, so I also manage another tool. It's simple. It's a cleaning tool. A giant washing machine. It's easy enough they don't hire me an operator so while I'm managing electroplating chemistry I also try to run this tool. So I run it, and I left one part on, the spray rinse, all weekend. At 1gpm, it filled our acid tank to the brim on Monday morning. Well 90% full at least. Thank goodness it wasn't a long weekend.
Oh. I didn't say a word about it. We just slowed down production (this was when the company was still in R&D mode) for a week until the acid dump truck got here to clean it out.
I don't think safety and facilities guys paid too much attention to the daily level readings enough and the company wasn't in full production mode with its tools yet so no one really assumed one tool went faulty over 3 day sor anything. I think they just were surprised the acid tank filled up much quicker than last time. LOL
Second scenario: This similar thing happened again. I left work early at 4pm once and I left my laptop in the production room to make it look like I was still there. Yeah. I had to pick up my mom from the hospital. So I did and I came back later at 7 to take my laptop back. LOL. Well, the operator thought I was still here so he didn't shut down our cleaning tool (this was way later than the first incident... we clearly hired a guy by then). So I assumed he would turn it off too because he turns it off 99% of the time unless production runs past his shift in which case I turn it off since I'm the engineer who stays well past their typical 5pm shift end time.
Well, I left not thinking about it because there's a 2nd shift guy who works in the room anyway. While he doesn't run my tool, he knows enough to do stuff if I ask him to. I figured the first shift guy would shut it off but he was gone (I forgot). He assumed I would. If all else fails the second shift guy would turn it off (cuz why would we run into 11pm at night anyway when no one's around?) Turns out second shift guy doesn't care because its not his tool so he leaves it running.
This isn't that bad. 6pm - 8am, the spray rinse dumps water into the acid tank. That's not too bad considering we run the tool for 6-8 hours a day of production anyway. But anyhow the safety person yells at me first thinking its my other tool (electroplating). The other tool owner engineer backs me up and defends me to the death. He's right because our electroplating tool doesn't fvck up. The engineer is beyond pissed and starts CCing my boss with the angry emails he's sending out to the safety guy. Everyone ends up hating the safety guy for their terrible attitude and quick fingerpointing.
Then I think about it for a bit and I ask the operator who comes in at 6pm if our cleaning tool was still on. It was. WHoops. I send out an email to everyone apologizing and saying it was my tool that screwed up and we assumed the other guy would turn it off. Sigh.
But so much drama over 14 hrs of extra "on-time." Really, it was just 1.5 - 2 days worth of production and it was a Tuesday. If that means by Thursday we would've been in a near-overflow situation, that's terribly managed. I think someone on safety didn't check the acid levels on a regular basis enough and freaked out when we ran a little more than normal.
In the end I think all we did was establish a backup procedure to make sure the second shift guy does a double check on all my tools and he makes sure they're off. That and me and the first shift guy will have clear communication who shuts off the tool and if I'm needed. It wasn't a huge deal since I just threw out 2 extra days of acid waste only. It wasn't like I caused an overflow. But the funny thing is most people didn't care much about it, and my team was more pissed than anything at the safety person who sent like LONG e-mails filled with drama accusing the other engineer of screwing up. Heh.
Scenario 3: I ran some SQL statements once that someone sent me. I changed a few things here and tehre, but I'm no coder. It crashed our server in no time. LOL.
Scenario 4: My first internship I installed MySQL server onto one of the company's servers. It wasn't the main server but some secondary one with the company's intranet page. It failed and could not be reinstalled. I was in college first year then. I freaked out and the IT guy sighed and took a try at it. He wasn't even familiar with MySQL and it took him forever to figure it out. I thought I was doomed.