Aside of these signs and the address numbers, the building is completely unmarked.
You must log in or register to comment.
Those are hazardous chemical markers. You commonly see them on tanker trucks as well.
The numbers range from 0 to 4, with higher numbers indicating more risk. The red top corner is flammability. The right yellow corner is instability; How likely it is to react with other things around it. The left blue corner is risk to health; Even if a chemical isn’t unstable or flammable, it can still be hazardous. The bottom white is for special markings. In this case, one of those chemicals is marked with a W, meaning it reacts to water.
So if there’s a fire at the warehouse, this tells the responding crew “hey just so you know, there’s some nasty shit in here. One presents a severe health hazard, becomes potentially explosive when heated, and reacts with water… But at least it isn’t flammable. The other is flammable and can present a moderate health risk. Because of the one on the left, it would be a bad idea to use water to fight this fire.”
100% correct answer.
Those diamonds indicate what chemical hazards are inside the building, for fire and rescue operations.
Thank you!
So in that building there’s a nonflammable reactant that’s super dangerous to life and reacts with water, and a flammable chemical that is quite toxic.
So… Bring my HEV suit and crowbar?
Depends, are you in the tank today?
They’re waiting for you, OP, in the test. Chamberrrr.
OP doesn’t need to hear this. OP’s a highly trained professional.
What’s interesting is they could have made one compound NFPA diamond that encompasses the worst ratings of everything in the building instead of two individual diamonds. The primary intent of these on buildings is to inform first responders of what they might be rushing into.
One diamond might give conflicting or incorrect info if there’s several things that would react to logically correct answers when firefighting. Last thing you need is to start a reaction when everything is already on fire because while it lists one reactant, it supercedes another reactant that would have been displayed on a secondary diamond.
Here’s my favourite warning, can you guess what it is?
Holy shit fours on blue AND yellow, AND it’s an oxidizer? My guess is some kind of halogenation agent, likely fluorine based. The lack of flammability with those stats makes me think it’s an inorganic compound, probably some wretched fluorine abomination.
404 not found
Chlorine trifluoride! Nasty, NASTY shit. Guess which industry I worked in as safety!
Edit: I remembered this quote about ClF3 from John D. Clark’s book “Ignition!” and wanted to share. For the non-scientists, hypergolic means it’ll ignite on contact with another substance without an outside energy source, like a spark.
It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water-with which it reacts explosively. It can be kept in some of the ordinary structural metals-steel, copper, aluminium, etc.-because of the formation of a thin film of insoluble metal fluoride which protects the bulk of the metal, just as the invisible coat of oxide on aluminium keeps it from burning up in the atmosphere. If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.
I think “Danger” might be putting it lightly…
Hah! You get two signal words with GHS: caution or danger. Caution is low stakes, where you might get skin irritation or maybe a mild burn. Danger is supposed to clue you in that it will fuck you up, but there’s no indicator of magnitude of fuck you up. Will it just give you a bad burn or will it melt your skin off while intercalating with your DNA?
I always wanted a third “oh helllll no” category for the really awful substances. For things like tert-Butyl hydroperoxide (it’s a straight 4-4-4) or Osmium tetroxide.
https://www.science.org/content/blog-post/things-i-won-t-work-dioxygen-difluoride
Probably related to this, very fun column to read.
Seems like it would definitely not have a 0 in red?
But it was a great read and I’m glad you posted it.
Edit: lol I dumb
Likely it’s a water treatment plant, probably a dosing plant for drinking water. Signs indicate which kind of chemical hazards are present, stored in relatively large and concentrated quantities.
No other signage because it’s critical infrastructure, and if you need to know, you know.
Dosing buildings like this are common downstream from dams and reservoirs. Where I live, they are also mostly unmarked and heavily fenced off. Same as electrical substations, phone exchanges and other infra.
As others have said, these are NFPA signs.
What I want to know is why there are two different ones. What the hell does that mean?
It means there are two separate chemicals inside of the building. Each chemical would have their individual labels on their containers, but these external signs are for first responders who haven’t entered the building yet.
Let’s say there’s a fire. The red diamond tells them how likely it is that the chemicals are the cause of the fire, and where they should direct their efforts. The blue corner tells them what kind of PPE they need to use if they enter. The yellow tells them what kind of potential explosive risks the chemicals have. And the white one is especially important, because the W means the chemical reacts with water; If there’s a fire at the facility, they can’t simply use fire hoses to fight it.
The reason for listing them separately is because each individual chemical has its own ratings. You can’t simply take the highest of each and combine them into a single sign. For instance, in this case one chemical isn’t flammable but is explosive when heated. The other chemical is flammable but not explosive. So if you see a chemical on fire, you know it’s the second chemical and isn’t explosive. But if you see something that isn’t burning in a room full of fire, you know it’s a potential powder keg waiting to explode.
Two different chemicals to be aware of
But it’s just slapped on the side of the building with no indication of which chemicals the labels are for, I don’t think that’s how it’s supposed to be done. It’d be like mixing two chemicals into a bottle and then putting two labels on it.
I think there should just be one label that combines the warning levels of both i.e. 3-2-2-W
You have good instincts - that’s also what NFPA recommends. This isn’t a typical presentation as usually it’s one diamond with the worst score of all present chemicals in each category.
You CAN list them individually but it’s a pain in the ass for both the building owner and first responders. The whole point is to quickly convey the level of hazards in the building for emergencies. They need to know if they need more information before entering. 2+ diamonds doesn’t provide any additional useful data and makes it harder to interpret in a rush.
I’m sure they’ll be labelled inside too.
Why are you assuming the chemicals are mixed together inside the building? Two separate chemicals, two distinct risks.
But the building, as a whole, pesents the combined risk of both chemicals.
First responders need to know that there are two chemicals inside so that they don’t stop taking precautions when they encounter the first one.
This is actually my field of work. The composite method queermunist is referencing is the industry best practice for exterior hazard labeling. NFPA diamonds don’t always or even often give first responders enough information to enter a building, so there’s no utility to multiple diamonds. Responders really don’t care how many chemicals are in a facility so much as what they are, and not many facilities actually using chemicals are set up in such a way that your example of encountering one chemical then another would work. They’re just everywhere, even during normal operations due to distributed storage and distribution systems.
What these signs do is alert them to the degree of danger inside so they can make decisions, e.g., enter if just flammable, avoid water use, or (most common of all) to act as a reference to ask the building owner more questions before doing anything at all.
