• Hi all and welcome to TheWoodHaven2 brought into the 21st Century, kicking and screaming! We all have Alasdair to thank for the vast bulk of the heavy lifting to get us here, no more so than me because he's taken away a huge burden of responsibility from my shoulders and brought us to this new shiny home, with all your previous content (hopefully) still intact! Please peruse and feed back. There is still plenty to do, like changing the colour scheme, adding the banner graphic, tweaking the odd setting here and there so I have added a new thread in the 'Technical Issues, Bugs and Feature Requests' forum for you to add any issues you find, any missing settings or just anything you'd like to see added/removed from the feature set that Xenforo offers. We will get to everything over the coming weeks so please be patient, but add anything at all to the thread I mention above and we promise to get to them over the next few days/weeks/months. In the meantime, please enjoy!

Whoops

You see this happen with slurry tankers sometimes, inattentive operator usually at fault where the hose has hit the bottom and sealed itself off.
 
There is a semi humerous thread on Da Web somewhere reporting on this phenomenon and illustrating its cause - vacuum, not pressure. If you don't 'crack the hatch' up top, the emptying pump allows the atmosphere to crush a voided tanker.
If you allow air in to replace the expelled contents, all is well. There have been a few instances of (particularly) sewage/septic tank emptiers recreating the archetypal "crumpled Coke can" by allowing matter, or negligence, to block the equalising valve.
Jokes about manure and revolving blades may follow?
 
SamQ aka Ah! Q! said:
There is a semi humerous thread on Da Web somewhere reporting on this phenomenon and illustrating its cause - vacuum, not pressure. If you don't 'crack the hatch' up top, the emptying pump allows the atmosphere to crush a voided tanker.
If you allow air in to replace the expelled contents, all is well. There have been a few instances of (particularly) sewage/septic tank emptiers recreating the archetypal "crumpled Coke can" by allowing matter, or negligence, to block the equalising valve.
Jokes about manure and revolving blades may follow?
Click to expand...
Yes I think you’re right, I’ve just noticed the drain hose at bottom right of the tank, so Atmospheric pressure- bit like a vacuum bag for laminating wood forms using a vacuum sweeper. Couldn’t believe the force exerted the first time I saw it done.
 
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