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Old 26 September 2006, 20:58   #11
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6.5 psi seems a little high to me. We usually run about 3.5 -4 psi. you can get a gauge with an adapter that you put in the tube filler valve for about $5 that gives you an accurate reading.
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Old 26 September 2006, 22:32   #12
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IIRC the label on the console of my Humber says 0.2 bar which is 3psi....

When I first got my boat and was leaving it moored to a pontoon I used to just run it "as it was on the day" which since I left it soft to be on the safe side when the sun came out (big black boarding wear patches which heat up!) meant it was rather wobbly.

Since having it out of the water over the winter and pumping it up each time before I launch, I have to say the boat feels much much better with correctly inflated tubes than when running them a bit soft. Having thought about it a bit I came to the same conclusion as Nos4r2 - that having them too soft puts a lot of stress on certain areas with the tubes flapping around and wrenching at certain points, especially where they go on to the transom which seemed to take a real hammering.. I just wish I had PRV's so I could leave them hard all the time

An ATV quad bike tyre runs about 3psi and it will deform with a firm poke of the finger but only by a couple of inches so the "poke test" is the yardstick I have used when inflating mine recently - hope it is not too far out!

When I deflated mine to do some repairs I reinflated them with the mains compressor in my garage (100psi) but only till they were almost back into their normal shape then finished off with the tube pump to be on the safe side. Didn't half save some time though!

I looked at a tube pressure gauge from Polymarine here but it was over 30 which seemed a lot to me!
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Old 26 September 2006, 22:34   #13
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Quote:
Originally Posted by Biggles
But would tubes that wobble about when making progress be too soft. They aren't overly soft but nonetheless they ain't rock hard. Can we assume that rock hard to the touch are the best condition to have your tubes.
On a RIB with the tubes clear of the water not really - look at a balloon - when is it easier to burst - when it's blown up tight as a drum or when it's a bit wrinkly???
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Old 26 September 2006, 23:13   #14
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Quote:
Originally Posted by codprawn
On a RIB with the tubes clear of the water not really - look at a balloon - when is it easier to burst - when it's blown up tight as a drum or when it's a bit wrinkly???
I suspect Biggles's tubes are at the happy medium between the two-same as mine. Hard enough to keep shape and not wobble all over the place but soft enough to deform in a bad stuff so they don't pop.
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Old 27 September 2006, 05:47   #15
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Quote:
Originally Posted by Nos4r2
I suspect Biggles's tubes are at the happy medium between the two-same as mine. Hard enough to keep shape and not wobble all over the place but soft enough to deform in a bad stuff so they don't pop.
Interestingly when I was looking at pressure relief valves recently (still no answer about my design for a screw on one - lazy gits!) one of the benefits given was to prevent overpressure in extreme rough conditions or collisions.

I think this is probably marketing tosh though - if you wallop something hard enough to pop a Hypalon tube, you surely ain't going to get a significant volume of air out through a half-inch hole in the timescale needed (probably about 1 second) to make any difference?!
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Old 27 September 2006, 05:52   #16
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I agree, although fitting multiple PRV's is sometimes the answer. PRV''s are usully fitted to prevent over pressure in hot climates/conditions.
Standard pressure for a tube should be 3.0 PSI, the PRV's that we fit open at 4 PSI.
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Old 27 September 2006, 07:42   #17
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Quote:
Originally Posted by BogMonster
Interestingly when I was looking at pressure relief valves recently (still no answer about my design for a screw on one - lazy gits!) one of the benefits given was to prevent overpressure in extreme rough conditions or collisions.

I think this is probably marketing tosh though - if you wallop something hard enough to pop a Hypalon tube, you surely ain't going to get a significant volume of air out through a half-inch hole in the timescale needed (probably about 1 second) to make any difference?!
Exactly - they are there for gradual pressure release due top weather conditions etc. It would be a bit like expecting a tyre valve to pop off to save your tyre when you hit a pothole!!!
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Old 27 September 2006, 15:08   #18
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Quote:
Originally Posted by BogMonster
Interestingly when I was looking at pressure relief valves recently (still no answer about my design for a screw on one - lazy gits!) one of the benefits given was to prevent overpressure in extreme rough conditions or collisions.

I think this is probably marketing tosh though - if you wallop something hard enough to pop a Hypalon tube, you surely ain't going to get a significant volume of air out through a half-inch hole in the timescale needed (probably about 1 second) to make any difference?!
Stephen,

What they possibly mean is that the tubes wouldn't already be overpressure before any incident, not that they would release air on impact. ie the tubes would already be at an optimum pressure, not rock hard ready to pop!
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