All Rounder help

[MrJay83]

I'm cold crashing a beer in my all rounder and everything is starting to fall but I stupidly gave it a slight shake (thinking if I disturbed it the hop matter would break up and sink quicker) and gas started to rush out. I had it at 9 psi after the dry hop, got to 8C in the cold crash and the pressure dropped to 3/4ish before my foolishness.
It sounded like it came from the gas post. I popped off the ball lock and gas was still releasing. I'm confused here because there is hardly something stuck in the ball lock that didn't cause this before when I had it at over 10 psi during fermentation.
Any advice will be much appreciated.
Also... Will continuing the cold crash damage the AR if pressure goes negative?

 

[LeeH]

You need positive pressure when crashing or it will implode.

Charles’s Law.

Was it a vacuum you heard rather than a leak?

 

[MrJay83]

I know that. More hoping that it being round gives it a bit more sturdiness. Popped the spunding valve off and I'm going to keg tomorrow to be safe.
Wrecks my head that I was so close to an almost oxygen exposure free fermentation & transfer. It's my first attempt so I'll put it down to the learning curve.

 

[MrJay83]

it a vacuum you heard rather than a leak?

Definitely a leak. I had 3 to 4 psi and it just dropped. Funny thing is that when I popped the spunding valve off I got a good hiss. So there was definitely some pressure there.

 

[LeeH]

I shake the **** out of mine without issue so don’t know what’s gone on.

I keep it on the gas when crashing, circa 2-3 PSI.

 

[MrJay83]

That's what had me confused because I had 2-3 times the pressure on it before the dry hop.
Time to experiment I'll put a few psi on to it and see what happens.

 

[MrJay83]

PRV was lose. Hit it with 10 psi and the PRV started hissing. Amazing how a slight (I mean slight) shake set it off at a much lower pressure than when I lifted it out of the fridge at a far higher pressure.
Crisis averted