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Old 23 July 2015, 22:54   #11
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How much more pressure can it be when going say from 1000 ft to 6000 ft above sea level, anyone know.


The reason I ask is I have a open stacker trailer, jeep on bottom and rib boat on top, cant get to boat while traveling so is 2 lbs air pressure ok in tubes while traveling to higher elevations..
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Old 23 July 2015, 23:48   #12
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Elevation is a big change. I didn't have a gauge but going down they go from full to completely flat and floppy. I would deflate as much as possible or maybe leave the valves open.
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Old 27 July 2015, 04:14   #13
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How much more pressure can it be when going say from 1000 ft to 6000 ft above sea level, anyone know.


The reason I ask is I have a open stacker trailer, jeep on bottom and rib boat on top, cant get to boat while traveling so is 2 lbs air pressure ok in tubes while traveling to higher elevations..
Going up will be fine. Pressure drops as you climb and temp usually falls too. However if you pump then up at 6000ft to 2psi and come down to 1000ft you will find they will increase in pressure - if temp stayed same maybe about 0.3-0.4psi increase. But temp likely to increase too...
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Old 27 July 2015, 04:39   #14
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Going up will be fine. Pressure drops as you climb and temp usually falls too. However if you pump then up at 6000ft to 2psi and come down to 1000ft you will find they will increase in pressure - if temp stayed same maybe about 0.3-0.4psi increase. But temp likely to increase too...
Me thinks you are wrong. When we talk tube pressure we are talking relative to atmosphere, so a drop in air pressure actually increases the apparent tube pressure.
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Old 27 July 2015, 05:15   #15
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Atmospheric pressure is typically about 14.2 psi at 1000ft and 11.8 psi at 6000ft. So the tubes' gauge pressure would increase by 2.4 psi as you climb.

If you have 2 psi in the tubes already, that could be enough to take you over the limit.
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Old 29 July 2015, 17:50   #16
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So 1 to 1.5 psi should be my max if ever going up in elevation just to be on the safe side, would not want the pressure in tubes to be to low so they wont flap in the wind..


It should also get colder as going up so that will also help keep the pressure down.
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Old 29 July 2015, 23:17   #17
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Many RIBs are tested for 15 PSI minimum and should not cause any damage, of course if the elevation or higher temperature is the new norm then they should be deflated 3 psi.
Best to check with your RIB manufacture to confirm max tested and rated PSI.
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Old 30 July 2015, 03:45   #18
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Or you could fit automatic release valves and the problem is sorted.
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