RE: [PSUBS-MAILIST] Double O-Ring On A Hatch

[Brent Hartwig <brenthartwig@hotmail.com>]

Greetings Carsten,
 
I would expect that if the outer O-Ring fails, that it would be great to have a back-up or even two. With subs we have so many things that have back-ups, why not back-up O-Rings? I plan to use stainless steel for my hatch flanges for lower maintenance.
 
Why does it seem that I see allot more small diameter O-Rings then large ones? The larger ones have a longer distance to compress then the smaller ones. If your hatch bottoms out on the metal surface then if the pressure is great enough the water can start to go around the O-Ring, right?

Regards,
Brent Hartwig

> Subject: Re: [PSUBS-MAILIST] Double O-Ring On A Hatch
> From: MerlinSub@t-online.de
> To: personal_submersibles@psubs.org
> Date: Wed, 8 Aug 2007 05:23:00 +0000
> 
> No idear why they make that.. one is just fine with lower 
> cost for rings, trench and paint maintance issue. 
> 
> I just pressuries my diverchamber with a 
> singel o-ring to 32 atmosp.. 
> 
> Think better one with bigger diameter than two smalls. 
> 
> best regards Carsten
> 
> "Brent Hartwig" <brenthartwig@hotmail.com> schrieb:
> > 
> > 
> > I finally found a double o-ring on a sub hatch. The sub on ebay right now called the Great Lake's Submarine mentioned earlier, has one. Here is the picture.
> > 
> > http://www.frappr.com/?a=viewphoto&id=4001713&pid=7375620
> > 
> > 
> > Regards,
> > Brent Hartwig
> 
> 
> 
> 
> 
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