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Old 30 April 2012, 22:13   #1
dek
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Inflation Question

Hi
Is it safe to inflate each chamber to its full pressure one at a time, or should I partially inflate each chamber to near full pressure then start again at no. 1 and so on .
Hope that makes sense.
cheers.
Dek.
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Old 30 April 2012, 22:25   #2
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It doesn't matter, the baffles between chambers can take full inflation pressure.
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Old 30 April 2012, 23:16   #3
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Quote:
Originally Posted by captnjack
It doesn't matter, the baffles between chambers can take full inflation pressure.
Many on here would disagree with that. The consensus seems to be to inflate all chambers till they have shape then go round again pumping to normal working pressure.
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Old 30 April 2012, 23:39   #4
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Quote:
Originally Posted by martini

Many on here would disagree with that. The consensus seems to be to inflate all chambers till they have shape then go round again pumping to normal working pressure.
That what I've heard and do every time.
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Old 01 May 2012, 00:31   #5
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Quote:
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Many on here would disagree with that. The consensus seems to be to inflate all chambers till they have shape then go round again pumping to normal working pressure.
Build quality must not be that high on those UK boats
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Old 01 May 2012, 06:39   #6
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Quote:
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Build quality must not be that high on those UK boats
Has more to do with purpose. Baffles are a stopgap, to prevent compete deflation in the event of a catastrophic failure of one section. From experience, I know that they are no stronger than any particular section of tube. Better to be safe than sorry (or in the water, wondering what the hell happened.)

jky
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Old 01 May 2012, 07:45   #7
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Think I will take the safe route, partially inflate it is.
thanks guys.
Dek.
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Old 01 May 2012, 09:00   #8
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What's the point in having baffles then if they can't take the pressure of a fully inflated chamber? Surely their primary purpose is to keep you buoyant if you puncture a chamber.
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Old 01 May 2012, 09:31   #9
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What's the point in having baffles then if they can't take the pressure of a fully inflated chamber? Surely their primary purpose is to keep you buoyant if you puncture a chamber.
i agree... what's the point of having a safety mechanism which is weaker than rest of the tube. However i do a intermediate pump before final pressure.
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Old 01 May 2012, 12:38   #10
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One slight advantage if inflating manually (foot pump ) by opening all the valves and then inflating one section to full as it inflates it does then help draw a little air into the next open chamber .
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Old 01 May 2012, 12:49   #11
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3 Way Adaptor

I have a Honwave T35 alu deck and the engineer in me has always thought that an adaptor which splits your pump output into 3 connectors would be a good idea (with long enough pipework to reach all).

You could then connect all 3 main chambers and inflate all together - they will be perfectly balanced during inflation and at completion.

Regards,

Dominic
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Old 01 May 2012, 12:57   #12
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Quote:
Originally Posted by dominic_baker
I have a Honwave T35 alu deck and the engineer in me has always thought that an adaptor which splits your pump output into 3 connectors would be a good idea (with long enough pipework to reach all).

You could then connect all 3 main chambers and inflate all together - they will be perfectly balanced during inflation and at completion.

Regards,

Dominic
Good idea, let me know if you manufacture something.
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Old 01 May 2012, 14:11   #13
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Quote:
Originally Posted by captnjack View Post
Build quality must not be that high on those UK boats
haha , made me smile i can`t see your hse being anywhere near as anal as a british one
though i always inflate my shanghai special 3/4 then top each chamber up
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Old 01 May 2012, 15:21   #14
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Quote:
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It doesn't matter, the baffles between chambers can take full inflation pressure.
Or you can do what the Bombard manual advise -which is take them all up to 3/4 ish pressure and then go round and top off.....
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Old 01 May 2012, 16:08   #15
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Quote:
Originally Posted by dominic_baker View Post
I have a Honwave T35 alu deck and the engineer in me has always thought that an adaptor which splits your pump output into 3 connectors would be a good idea (with long enough pipework to reach all).

You could then connect all 3 main chambers and inflate all together - they will be perfectly balanced during inflation and at completion.

Regards,

Dominic
This does not work. I tried it and you will preferentially inflate one chamber possibly overpressurizing it. The valves don't all open at exactly the same pressure, there's flow losses in the shorter tubes and a bunch of other factors which conspire against it being simple.
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Old 01 May 2012, 16:10   #16
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Or you can do what the Bombard manual advise -which is take them all up to 3/4 ish pressure and then go round and top off.....
Well I never deflate mine anyway, so they are all basically round before I start. Where the baffle is I don't worry about, for all I know it could be 99% towards one chamber vs another.
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Old 01 May 2012, 20:57   #17
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Don't forget some boats need a sequence starting at the bow and working back otherwise on some makes the baffles can be reversed and cause stress problems some times causing a waist on the sponson/tube.
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Old 01 May 2012, 21:13   #18
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I onece pumped my Aerotec with my bravo pump to the same pressure as the floor didn't do any damage & I do not set the boat up after the pub any more
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Old 01 May 2012, 21:15   #19
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As Peterm says.....In most Tube manuals it will clearly state they should not be fully inflated individually. Dek i would gradually do it...as all decent manufacturers would indicate that. its also in your handbook
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Old 03 May 2012, 16:02   #20
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When a chamber deflates, the near inflated chamber baffle protudes into the deflated chamber. Thus, the pressure in the inflated chamber GOES DOWN because the volume expands.

In the opposite: if you inflate a chamber to the correct pressure, but not the near chamber, the inflated chamber baflle protudes.
So when you inflate the near chamber, the baffle will go back - INCREASING THE PRESSURE OF THE CHAMBER.

That is exactly the mechanism that explains how to get a third family jewel with a hernia.
How disgusting.
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