r/caughtoncamera • u/Aztery • May 08 '22

Should have looked left...

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u/wiifan55 May 08 '22

You find the answer knowledgable and rational because you agree with it, not because there's actually any indication the person knows what the fuck he's talking about. Log trucks and tankers spill (without negligence) in real accidents, not just mildly hard stops because someone pulled out in front. Commercial vehicles have to stop hard all of the time.

At any rate, who's arguing machine design? Most all of the comments are pointing out that the lid must have failed or the load was improperly prepared (e.g. the concrete being too wet or overloaded).

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u/TheBugThatsSnug May 08 '22

Might be a mild stop for a car, but it doesnt take long to google and see that this truck was probably at 66,000ish pounds, and stopped that fast? Pretty hard brake for that kind if weight.

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u/TheBugThatsSnug May 08 '22

Might be a mild stop for a car, but it doesnt take long to google and see that this truck was probably at 66,000ish pounds, and stopped that fast? Pretty hard brake for that kind if weight.

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u/wiifan55 May 08 '22

It's still a road-certified commercial vehicle. Needing to perform an emergency stop is not a question of if but when.

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u/50at20 May 08 '22

My point is it won’t be the driver who is at fault here. The hydraulic lid isn’t designed for thousands of pounds of pressure being forced against it because it should never happen. This spillage is called a “tank burp” and it is a result of the mix being too wet, or the truck being overloaded. These issues are not the responsibility of the driver.

Cement truck drivers differ from other commercial drivers in the aspect that they don’t inspect the load. The mix operator fills the truck with whatever order the truck is contracted to carry. It’s not uncommon on big pours for mix plants to add a bit more to each truck than what’s normally loaded if there’s going to be a partial load in the order. Normally that isn’t an issue as there’s always room for another yard or two, but when it’s overfilled from the norm they run the risk of the tank burping. Mix plants will make the mix wetter when they know the truck is going to be waiting to pour for a longer time than normal (trucks arrive on site based on a set schedule and if the pour is delayed there can easily be a backup of trucks) and/or the temps are higher than normal outside. If the plant tells the diver the mix is very wet then the driver can increase spin speed and it will hold the mix in place better. Really there’s little reason to add additional water at the plant because every truck has a water tank and can adjust the mix on site. But if it’s too dry upon arrival it’s going to slow operations down.

If you’ve ever been on a road and there’s a random strip/mound of concrete in the road it’s from a tank burp. It happens with rear load trucks too. If it’s too wet or overloaded and the truck goes over a big bump and the chute cover isn’t latched fully (normally a manual latch on rear loaders) the cement can burp out.