Tube Pressure - Merlin 17

[hazardpro]

Hi I have just got a Merlin 17 rib.... Its Hypalon

Im trying to find out what the 'default' pressure should be. in morning/end of day it deflates (I know this is expected with temp change) but it does it a little too much and I feel and loses its shape a little (see pic) so I want to top it up.

PS when the suns out its pretty firm.

Also I was thinking of adding safety release valves as a safe guard - not sure if I can retro fit anything (see pic)?

Thanks

D

[rik_elliott]

2-3psi is a typically working pressure. You can fit pressure relief valves which make sense in hot climates but in the UK if you store the boat with a cover / out of the sun and let some air out as the weather gets warmer you shouldn't have any issues.

[GARYSHORT]

3.2 PSI is standard good pressure. Under becomes too soft when you put it in the water. Never go above 3.5 as it begins to stress the seams. Watch the pressure i the hot sun. Over pressure valves are a good idea in hotter climates or if you travel to altitude. Saw a boat on the side of the road with blown tubes.