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Old 03 October 2020, 05:49   #1
Country: Australia
Town: Perth
Boat name: N/A
Make: Zodiac
Length: 4m +
Engine: Mercury EFI 40 HP
Join Date: Sep 2020
Posts: 5
New RIB Owner Question

Hi All, could use a little advice on how you experienced RIB owners who live or operate their RIBs in hot climates manage the air presssures in their tubes.

The recommended air pressure for my 2007 Zodiac Pro 420 is approx 3.4 PSI (0.2344 Bar or 23.44 KPa) the daily temperature variation I experience is between 15 C and 42 C ( 59 F - 108 F). The average sea temperature is within a range of 17C to 22 C (66 F to 70 F).

I am worried about overpressuring the tubes and wondering do you folks bleed air off during the hottest part of the day and top up the next morning. Or do you inflate to recomended operating pressure at say 30C and then let the pressure fluctuate with the temperature.

Does anyone have a Temperature V Pressure table for Zodiac Pro 420 (2007) and/or know what the recomended upper and lower operating pressure limits are for my tubes. If anyone willing to share a pdf of the owners manual with me I would appreciate it. Thanks in advance for your responses.

AusRIB is offline   Reply With Quote
Old 03 October 2020, 10:45   #2
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,029
Best way is to have pressure relief valves fitted and top up when the air/temperatures are lower. If no relief valves I just blip the valves and top up when needed.
There is a formular which lorrry drivers use temp increase versus volume increase for tyres

jeffstevens763@g is offline   Reply With Quote
Old 03 October 2020, 20:59   #3
Country: Australia
Town: Beckenham
Boat name: No Name
Make: Highfield
Length: 3m +
Engine: Outboard Suzuki 30HP
Join Date: Mar 2019
Posts: 116
Hi ausRIB
I did write a post then obviously pressed the wrong button.

I live in Perth and do not worry about the increase in pressure during the summer.

My boat is kept in the shade, recommended in our climate and, the tubes should be White.

I have been told that under pressure is more of a problem than slightly over pressure. Also I have been informed that pressure relief valves can just be an other source of problems.

If you consider the shock wave that goes through a RIB tube when you hit a wave, a bit of over pressure can't be an issue.

Are you going to the Mandurah Boat Show this month?
Salty Pete is offline   Reply With Quote

air pressure management, rib

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