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Old 12 August 2007, 13:40   #11
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When I had my temporary botch up repair in place recently it was filled with a tyre valve so I could measure it and 3psi was nice and firm and I thought probably about right for "feel" - but you need to start with the tube pretty hard here as the water temp can be down to 2 or 3 deg C in the winter and it soon takes the heat out of the air inside the tube when you get under way.

I think running them under inflated would probably damage the tubes as the fabric would flex in places it wasn't designed to - the air pressure seems to give the tube "structure" if I can put it that way.
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Old 12 August 2007, 15:19   #12
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normal use 1.5psi , race boat as hard as possible ,hypalon fabric is only gaurenteed to be airtight upto 4psi
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Old 12 August 2007, 17:38   #13
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Do I have pressure relief valves?

Can anyone tell me if I have pressure relief valves? How can I tell? They look like standard Leafield C7 valves similar to those on the Henfield web site.

If I can do it, and I don't have them, I would really like to fit relief valves, so i don't damage the tubes in the sun! Can this be done?

I guess I should have found this out months ago!

Now I am concerned.
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Old 12 August 2007, 17:47   #14
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Having my old RIB up the drive I would give them a gentle squeez when walking by. If they were too hard I would deflate them a little and too soft (in Winter) would inflate. I guess it's a little more difficult with a RIB on a mooring or lockup. Best to err on the side of caution and deflate them after each day of use. Only takes 5 mins blowing them up anyway.
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Old 12 August 2007, 17:55   #15
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if you have 5 air chambers with 5 valves you do not have pressure relief valves .they can be fitted as an afterthought
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Old 12 August 2007, 18:06   #16
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Quote:
Originally Posted by paul tilley View Post
if you have 5 air chambers with 5 valves you do not have pressure relief valves .they can be fitted as an afterthought
By replacing just the valve tops or the whole fitting (cut and glue job)?
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Old 12 August 2007, 18:11   #17
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you cant change top as c7 is fill valve ,a6 is relief valve separate units .cut ,reinforce and fit a6 valves
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Old 12 August 2007, 18:25   #18
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What angle on the tubes would you fit relief valves Paul?

Downward or at 90 degrees to the floor? (I guess upwards would be a bad idea?!)
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Old 13 August 2007, 08:49   #19
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normally 90 degrees or less to floor
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Old 13 August 2007, 09:06   #20
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So I conclude that I don't have relief valves and should be looking at two PSI. Thanks to everyone!
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