this post was submitted on 01 Nov 2024
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I'm aware of the NCIS scenes, what else you guys got?

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[–] [email protected] 97 points 1 month ago (5 children)

This happens with fire sprinklers a lot, one sprinkler goes off, and triggers the rest of the floor, or sometimes even building.

That's not how it works. Each sprinkler has it's own trigger mechanism, the glass bulb, and cannot trigger another sprinkler.

There are systems where this happens, but the sprinkler heads look very different, and you won't find them in an office building.

[–] [email protected] 47 points 1 month ago (1 children)

Isn’t the water in sprinkler systems a stagnant mess too?

[–] [email protected] 52 points 1 month ago (2 children)

Yes. A combination of rust, thread cutting oil, and water that has been in the pipes often since the system was filled. It smells, it will stain anything it touches, and it's a smell that's difficult to remove.

[–] [email protected] 8 points 1 month ago

Once I turned a suspicious faucet I shouldn't have and got a blast of this in the face.

[–] [email protected] 36 points 1 month ago

This guy sprinkles

[–] [email protected] 3 points 1 month ago (1 children)

Also I've heard that the water that first comes out of those sprinklers is RANK from having sat in the pipes for years

[–] [email protected] 2 points 1 month ago

It definitely is.

It has a particular smell that doesn't come out of fabric easily, either.

[–] [email protected] 2 points 1 month ago (2 children)

Theoretically the water hammer effect might be able to break that glass, but I think it's unlikely.

[–] [email protected] 2 points 1 month ago

I don't think water hammer would apply because there's no abrupt cutoff or change in direction of the flow.

[–] [email protected] 1 points 1 month ago

You get a water hammer when you shut off the flow, not when you open it.

[–] [email protected] 1 points 1 month ago

There are sprinklers where this happens and the sprinklers look exactly the same. There’s a pressure switch on the sprinkler line that activates a deluge pump. This pump has enough pressure and flow capacity to break open the glass ampules of the remaining sprinklers in the circuit.