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Cake day: June 21st, 2023

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  • It’s likely that you can injure yourself with those, yes, but the injuries that are most likely to occur are not high severity. The more significant injuries are less likely to happen, and there are things we do to make that the case. Kettles have a closed top, as do saucepans. There are procedures to use knives so that you don’t hurt yourself, and if you’re chopping something tricky, you typically pay heightened attention to it.

    The risk assessment is all about likelihood and severity for scenarios, and the purpose of safeguards is to reduce that likelihood to meet an acceptable risk tolerance. With McDonald’s here, they not only had a very high severity incident, but they also didn’t really take steps to reduce the likelihood. They could have served it with a lid. They could have used a larger cup than necessary so the water level was low. They could have added the cream and sugar before giving it to the customer, so there was no need to do anything except hold it and drink it.

    In other words, they were completely reckless. And if you behaved recklessly in your kitchen, it would also be a red flag in these safety analyses. Do you typically transfer boiling water when it’s in a container full to the brim? Do you watch TV while chopping tricky food with blunt knives? Do you leave your floor wet if there’s a spill? What about cranking your stove up to max your everything you do, or using your oven without oven mitts?

    You’re being very purposely obtuse by suggesting third degree burns are comparable to burns from briefly touching the stove. Feel free to continue doing so however, it only highlights the difference between serious safety analysis and being a contrarian jackass.


  • I’ll give you another angle. I’m familiar with safety hazard analysis in industrial settings – HAZOPs and LOPAs, if you’ve heard of them. By our guidelines, this event would be a significant violation. This would be considered giving a disability to a member of the public, which ranks as either the highest severity or second highest severity incident possible (varies depending on the risk matrix in question).

    Considering the liquid can cause severe burns in 2 seconds, was served without a lid, and was given to someone in a moving vehicle, the likelihood of this incident would be incredibly high. Taken together, an industrial analysis would call for at least 3 independent layers of protection to prevent the incident from occuring, where each layer reduces the likelihood of the event by a factor of 10. There are no protections or safeguards in this situation.

    Mitigating this risk would be incredibly high priority. It’s at the point where you might shut down, i.e. stop serving coffee, until you have robust protections in place. I can’t stress enough that what McDonald’s was doing is riskier than you’ll see in industrial plants.



  • How likely are you to spill a high volume of Mac n Cheese on yourself in the kitchen, to the point that it soaks through your clothes, versus spilling an open cup of coffee in a car?

    We do encounter dangerous things everyday, and this scenario is more dangerous than what’s acceptable at industrial plants. You would be required to put in several safeguards which each reduced the chance of the event occuring by a factor of 10.

    As a process engineer it’s absolutely insane to me how risky this was. I believe something causing permanent injury/disability to a member of the public would actually be our highest or second highest severity category. With how likely this is to happen, if a company had inadequate safeguards in place, they would be heavily fined and I don’t even know what else. This is a flagrant safety violation from a process engineering perspective.





  • Consider however that she wasn’t served this coffee in a store, but in a car. The possibility of spilling the drink is significantly more likely, especially since she wasn’t given a lid. This isn’t the woman’s fault at all, it was a horrible accident just waiting to happen. It’s like if a roller rink covered the floor in grease and periodically had spike pits.

    I did a bunch of chemistry lab classes in college, I think I had one each year actually. We regularly heated liquids and worked with concentrated acids. If we had spilled a liquid this hot on ourselves in a similar volume, we would have seen similar burns. It would take longer than 2 seconds to rip off a glove (which is probably fused to your skin very quickly anyway) or disrobe our labcoats. The coffee being spilled on us like this would have given us incredibly severe burns too, and that’s with PPE and emergency safety equipment right there. It would take far, far longer to get to one one of the showers and activate it even.

    And this is in a controlled lab environment! There was no heightened risk of spills because of being in a moving vehicle nor having an open cup.