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Old 11 October 2003, 20:07   #1
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Tube Question

As a relatively new owner of a Rib (4 months), I would like to know how often it is reasonably expected to top up the air in the tubes.

They've never gone flat, but I've noticed them a liitle squidgy a couple of times over the time I've had the boat,(on cooler days), and I've topped them up with air a couple of times.

Is this normal and to be expected?

Thanks for any advice
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Old 12 October 2003, 02:42   #2
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The same has happened to my tubes, but I have put it down to the reduction in air temperature.
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Old 12 October 2003, 05:07   #3
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The 'hardness' of the tubes will vary quite a lot with the air temperature. First thing in the morning they may be a bit soft but by the middle of a sunny day they will be quite hard.

I think all tubes will loose a little pressure over time but ther RIB guys should tell you how often to expect to top them up.

Keith (all inflatable) Hart
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Old 12 October 2003, 06:01   #4
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Tim,
At this time of year we're putting air in every weekend as it gets colder. Remember to release some pressure next year as the air will expand again as it gets hotter.
Have you sorted out your throttle cable?
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Old 12 October 2003, 11:11   #5
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RichardB thanks,

I 've asked them to sort the throttle cable when the engine is serviced and winterised this week.

Hope to be able to meet up on the Solent in the spring.
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Old 13 October 2003, 13:10   #6
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Tube Pressure

The majority of RIB owners probably run their tubes at around 1.75 to 2psi. For every degree centigrade in temperature change, you must allow for a pressure drop(or increase) of 0.058psi.

So if there is say a drop of 5 degrees in the temperature from when the tubes were inflated, the natural pressure drop in the tubes will be 0.29psi. This would be a reduction of 17% at 1.75psi
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Old 13 October 2003, 13:37   #7
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Christopher - Is that all hyperthitical, or have you got a pressure guage that reads from 0 to 2 psi with an accuracy of 0.001 psi?
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Old 14 October 2003, 03:58   #8
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Tim forget all this p.s.i lark (no offence anyone). I've experimented with pressure guages, electric pumps with psi metres etc. In truth it's as simple as this, "just top em up as and when required". Some like 'em softish and don't pay too much attention to the pressure and some like 'em rock hard.
I pump them until the pump gives good resistance (foot pump) or I can depress the tube with my thumb about half a centimetre.
My Zodiac needs air about every other weekend. My pals Caribe needs it every other day whilst his Yam 380s never needs any.
If you have a leak you'll know about it as the tubes won't just go soft they will go down.

Ask 10 ribsters and get 10 different answers.
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Old 14 October 2003, 04:25   #9
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Thanks,

I really wanted to see if I had a leak, and as they are not going flat, I haven't.

I don't mind topping them up as long as that's normal which it seems it is.

Many thanks
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Old 14 October 2003, 09:20   #10
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If You want to know if there is a leak, check if all tubes are softening at the same rate. If all chambers are loosing air in exactly the same rate, there is not a problem. If just one or two - then you have to get a glue before going to sea!
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