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Old 15 October 2016, 07:22   #11
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"tubes don't really change in volume with temp,that's why they go hard (and eventually burst)."
Splitting Hairs there eh Pol?...
The Tubes themselves may not...but I'm sure you'll agree the AIR IN them does expand and decrease in volume with temperature fluxuation ( something all inflatable owners recognise) and does indeed therefore expand and contract the surface..Hyperlon...and then effect the Tube pressure,which in turn may cause stress on any surface/interface not joined to them properly.

The answer was to Beer Belly by the way..who was talking about his Osprey...although I'm sure the OP thinks just as much of his North craft!.
As to the exchange rate...yep it is a bit low at the mo,but I'm sure it's only temporary,and will be well worth it in the end!
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Old 15 October 2016, 08:13   #12
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"tubes don't really change in volume with temp,that's why they go hard (and eventually burst)."
Splitting Hairs there eh Pol?...
The Tubes themselves may not...but I'm sure you'll agree the AIR IN them does expand and decrease in volume with temperature fluxuation ( something all inflatable owners recognise) and does indeed therefore expand and contract the surface..Hyperlon...and then effect the Tube pressure,
Not really. High school science. The air can't expand and so increases in pressure.
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Old 15 October 2016, 09:11   #13
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Not really. High school science. The air can't expand and so increases in pressure.
...YES!...On the Tubes which expand!....and change Shape (enlarge and decrease) as a consequence!
..and there's the Clue to why we fit pressure release valves!
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Old 15 October 2016, 09:15   #14
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On that note, I noticed that I don't seem to have prv's on my Tubes, are these easily fitted or another specialist job?
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Old 15 October 2016, 09:43   #15
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...YES!...On the Tubes which expand!....and change Shape (enlarge and decrease) as a consequence!
..and there's the Clue to why we fit pressure release valves!
No if the tubes stretched (like a balloon) you wouldn't need PRVs unless something very extreme was happening, it's because hypalon and pvc don't stretch significantly that the pressure increases. The Tubes only change shape, from "cylindrical" to "limp sack" if you have a leak, otherwise the diameter remains the same. Hence there is little stress on the tube-wear patch joint, and it's gluing is not as critical as others (in case you've forgotten the point of the discussion)!
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Old 15 October 2016, 09:53   #16
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On that note, I noticed that I don't seem to have prv's on my Tubes, are these easily fitted or another specialist job?
The aesthetics are probably easier to manage, but they need to be air tight, and probably more importantly you have to do the scary part of taking a knife to your otherwise perfect tubes.

If you keep the inside of the tubes dry, the pressure change will be much lower than with moisture condensing/evaporating. In NI you might not get enough pressure / temp fluctuation to worry unless you have black tubes, or leave your boat in blaring sunshine (afloat is not so much of an issue as the water cools the content). If you are worried then a bit of discipline to let air out when sun is forecast will keep you right.
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Old 15 October 2016, 09:56   #17
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How about just filling the tubes with nitrogen? Would this not eliminate the need for prv's?
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Old 15 October 2016, 10:03   #18
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Quote:
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No if the tubes stretched (like a balloon) you wouldn't need PRVs unless something very extreme was happening, it's because hypalon and pvc don't stretch significantly that the pressure increases. The Tubes only change shape, from "cylindrical" to "limp sack" if you have a leak, otherwise the diameter remains the same. Hence there is little stress on the tube-wear patch joint, and it's gluing is not as critical as others (in case you've forgotten the point of the discussion)!
No I don't agree..again I think it's a case of theory and practise P.
Sometimes in cold conditions (and I do go out in the winter)
The tubes need a good bit of air to get them up to pressure.(just one example)..it's the difrence and stress/movement caused by the Tubes altering shape that I referred too,...That's before you start letting Tubes down for transport or storage ect like some do.
Hence you need a really good seal when glueing to stop any problems arising...I have 10 wear thick Treadmaster wear patches fitted properly in the first place 4 years Boating in ALL conditions and no problems.
...I've seen plenty that have.
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Old 15 October 2016, 12:14   #19
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Quote:
Originally Posted by Maximus View Post
...YES!...On the Tubes which expand!....and change Shape (enlarge and decrease) as a consequence!
..and there's the Clue to why we fit pressure release valves!
Quote:
Originally Posted by Poly View Post
No if the tubes stretched (like a balloon) you wouldn't need PRVs unless something very extreme was happening, it's because hypalon and pvc don't stretch significantly that the pressure increases. The Tubes only change shape, from "cylindrical" to "limp sack" if you have a leak, otherwise the diameter remains the same. Hence there is little stress on the tube-wear patch joint, and it's gluing is not as critical as others (in case you've forgotten the point of the discussion)!

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Old 15 October 2016, 12:32   #20
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Indeed ! That's why I've just paid many pennies to have patches and cleats fitted by a 'pro'. I'd hate to argue with myself if I was doing it 😃

Ps. Pic shows them BEFORE they were glued down 😂

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