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Old 22 November 2005, 17:05   #11
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try polymarine for a pressure gauge . the mod use 1.5psi as a working pressure and 2psi as max pressure
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Old 22 November 2005, 18:22   #12
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Anyone know what pressure blow-off valves blow off at?
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Old 22 November 2005, 18:31   #13
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Quote:
Originally Posted by jwalker
Anyone know what pressure blow-off valves blow off at?
depends on the valve - they come set at various different pressures
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Old 22 November 2005, 19:01   #14
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Quote:
Originally Posted by jwalker
Anyone know what pressure blow-off valves blow off at?

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Old 22 November 2005, 19:05   #15
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Quote:
Originally Posted by jwalker
Anyone know what pressure blow-off valves blow off at?
typically 3.7 or 3.8 psi is what i have been told by three different tube manufacturers
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Old 23 November 2005, 02:12   #16
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Our club also has an Avon CCRC520, (for those that donít know this SIB has a flexible floor so it can be rolled up without taking the floor out) with a few divers onboard it would wallow all over the place & take for ever to get anywhere. Then the subject of pressure cropped up, so I phoned Avon & asked the magic question & was told it should be run at 2.5psi. After a rummage through the back of the boat shed we found the Avon pressure gage, & next time out we pumped it up to said pressure.
Yes the boat went a lot better but it was a harder ride for the people onboard, the biggest problem was when we just touched a breakwater with the port rear tube.
There was a resounding BANG followed by that sinking feeling, 3 out of the 5 tube chambers were completely deflated.
On close inspection after getting it out of the water showed there was a 3foot split in the back tube, & the next 2 chambers had blown the ends out of the baffles.
On having it repaired it would appear this is common when they are inflated hard (itís a bit like sticking a pin in a hard balloon as apposed to a soft one) the sudden loss of pressure in one chamber caused the baffle to go in the next one & so on.
So be aware if your rib is hard (oh err misses) & you bump into anything be prepared for a bang rather than a hiss.
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Old 23 November 2005, 04:56   #17
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Quote:
Originally Posted by jwalker
Anyone know what pressure blow-off valves blow off at?
I don't know if it's any help but I have a two step valve in each chamber, first blows at 3.5 psi and deals with normal over inflation and temp changes etc. and the other which is MUCH bigger blows at 7 psi, designed to let go if you impact something hard

atb

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Old 23 November 2005, 05:08   #18
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The tubes should be inflated to a pressure where you can push them in a little. If a tube is blow up so it has no flex then this will be reflected in the boats sea handling characteristics. Think of a tube like a shock absorber, the harder it is the less pressure it will take out of an awkward landing. Having said this you do not want them so soft as to affect the stability of the boat, as after all this is all the tubes do.


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Old 23 November 2005, 05:15   #19
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Some interesting stuff here and here Des
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Old 23 November 2005, 05:27   #20
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Quote:
Originally Posted by Jackwabbit
Then the subject of pressure cropped up, so I phoned Avon & asked the magic question & was told it should be run at 2.5psi.
Are you sure it wasnt just the floor that was supposed to be at 2.5 PSI and not all the tubes.

I used to have a Metzeler SIB that had a honey comb deck and it had to be at a much higher pressure than the tubes.
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