Saw this when I was putting cardboard in my blue bin I’ve never saw it before, what does it mean?

by oldwizard1885

15 comments
  1. The noise level (99 decibels) when moved/emptied, I’m sure

  2. Basically the loudest it can be from slamming the lid or wheeling it along the ground.

  3. No raves over 99db in the bin otherwise they won’t empty it

  4. Disnae make a big bang when ye shut it. Just a wee bang. And a even bigger bang if you leave it out in the sun!!! Sound level when you close the lid “db decibels.”

  5. It’s the highest safe velocity that the bin can be piloted over a supermarket car park by an appropriately fuelled Bam.

  6. If your taking a bin to a festival the bin can only survive up to 99 decibels.

  7. 99 db is a target noise level that all binmen try and exceed. Especially first thing in the morning

  8. This is an noise level marking, expressed using [LwA](https://en.wikipedia.org/wiki/Sound_power#Sound_power_level)

    So, let’s break it down!

    L means it is a “level”, insicating a logarithmic scale (decibel in this case) and the W indicates the level is measured as [sound power](https://en.wikipedia.org/wiki/Sound_power) (as opposed to [sound pressure](https://en.wikipedia.org/wiki/Sound_pressure)), and finally the A means that the [A-weighting](https://en.wikipedia.org/wiki/A-weighting) is used, which is a frequency-dependent filter used to emulate the sound perception of the human ear.

    The scale/weighting being used, and the specification of “power” is important because [decibela](https://en.wikipedia.org/wiki/Decibel) on their own are not a unit – it’s just a tenth (*deci-*) of a *Bel*, which is a relationship between two relative intensities. You see things like decibel-volts and decibel-power and decibel-levels and you can pretty much make your own.

    In other words, decibels can mean different things depending on how you use it… So LwA just specifies that.

    So, putting all this together, it means your wheelie bin, during “operation” it was measured at 99dB (sound power, filtered to mimic the human ear response), for 90% of the time during operation (this part is from an ISO standard that they use to make sure everyone measures in the same way)

    So what is 99dB sound-power? It’s a little less quiet than a jackhammer at a distance of 5 meters, Lawn mower, Car at highway speed or Subway steel wheels, which are all *about* 100dB at a distance of 28cm if I’m reading [this table](https://www.engineeringtoolbox.com/sound-power-level-d_58.html) correctly.

    Note the power is expressed both linearly and as dB with a reference in that table.

    Happy wheelie-binning! I’ll see if I can find out what the test procedure for these are – as that might be when it’s getting slammed around by a rubbish truck, or when it’s getting wheeled around when empty, or when the kid is banged.

    Found it in EN ISO 3744

    It should be tested in an open-area or reflecting-plane setup, using measurements taken via multiple microphones around the bin during a full operation cycle.

    So there it is. *During 90% of the **operating cycle** the volume is, at most 99dB(A)*

    So, the operating cycle will likely include dragging it out to the kerb, emptying it, dragging it back, and banging on the lid for fun.

  9. It’s the mandatory minimum sound level the bin people must make when emptying it to alert households that it’s time to retrieve their wheelie bin.

  10. I need to show this to my neighbour. The guy scares the shit out of me almost daily when he chucks stuff in the bin. The space between our two houses amplifies the noise even more and if you didn’t know any better, you could easily mistaken it for a small explosion while indoors.

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