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Old 18 November 2013, 07:27   #1
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Temperature bursting a Rib?

I just wondered whether there have ever been cases of a change in temperature causing the tubes of a Rib to burst?

(P1.V1) / T1 = (P2.V2) / T2 and all that.
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Old 18 November 2013, 07:29   #2
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Yes. Even with overpressure valves, it has happened...
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Old 18 November 2013, 07:41   #3
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Yes. Even with overpressure valves, it has happened...
I had to put an awful lot in over the weekend. Just to be sure, I'll let some out again.

(An ideal opportunity to use the word "flaccid", but I haven't)
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Old 18 November 2013, 08:13   #4
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It would need to be pumped hard when cold and then parked up in sunlight. You'd also need to have a sticky overpressure valve...

Chances are low - but -
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Old 18 November 2013, 08:32   #5
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if you do the physics you'll see that temperature change on air will make not a huge amount of difference to the pressure. However, any moisture in the tube has the potential to make much larger fluctuations.

*I* believe that the biggest impact of temperature is it softens the glue - afterall that is how you 'unstick' patches etc. Combined with a little extra pressure a weakened joint may pop.
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Old 19 November 2013, 04:55   #6
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*I* believe that the biggest impact of temperature is it softens the glue - afterall that is how you 'unstick' patches etc.

Can't see that myself. The temp of a hot air gun is considerably more than a hot summers day. So going on your theory, there'd be a lot of deflated tubes around the med, caribean etc
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Old 19 November 2013, 07:19   #7
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[QUOTE=Poly;583177]if you do the physics you'll see that temperature change on air will make not a huge amount of difference to the pressure. However, any moisture in the tube has the potential to make much larger fluctuations.]

OC to 30C is about 10% increase in pressure. Moisture-wise I would have to dig out my steam tables.

Nitrogen-filled tubes here we come!
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Old 19 November 2013, 07:29   #8
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Put your hand on a rib sat in very still air, in the mid day sun (summer in wales) on a beach, it gets very hot, maybe even 50 deg c.....
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Old 19 November 2013, 09:55   #9
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Yes, but thats the temp of the tube, which may not be the temp of the air inside it. How well does the tube conduct heat to the air in it ?
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Old 19 November 2013, 10:25   #10
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I've often wondered about this. Trailering the boat in CA i can encounter 50+ degree F temperature swings in the summer. It will be 55F and foggy in the coast and 100+F inland and back again. I usually stopped a few times and deflated and inflated as I didn't want to find out the hard way if they could burst.

On a side note I just recently purchased a pressure gauge and discovered that I have been filling my tubes too low. I was usually down around 1.5 PSI.

Jason
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