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

[MerlinSub@t-online.de]

The 8 mm diamter o-ring on the 700 mm diameter hatch on the euronauts diverchamber just pass his 32 bar (320 meter = 1000 feet) duriong the diverchamber waterpressure test. Without any problems. 
Also the single 4 mm o-rings on the small 90 mm diamter windows and the big one 16 mm diamter 
in the 700 mm diameter diver exit. The only reason that this o-ring is such strong is that the divers there need a more robust construction.  

Make the trench right to the construction books for the o-rig size and you will get no problems. 
The O- Ring on my diver Bottles resistans 200-600 bars without problems 

Regards carsten 



"Brent Hartwig" <brenthartwig@hotmail.com> schrieb:
> 
> Greetings Cliff,
>  
> Thank you for the good link. The first couple of drawings on the page showing the O-ring cross section being compressed, have some problems when compared to a sub hatch O-ring and groove. First the groove would need to be a little narrower then the O-ring cross section to hold the O-ring in place when the hatch is open. Then there would also be more distortion on the top and bottom of the O-ring when the hatch flange is pressing down on it.
>  
> In regards to spliced O-rings, I would also like to acquire standard sized O-rings when possible. But for very custom O-ring sizes like might of been needed for Krakas and the Euronauts engine room hull flanges one might need a spliced O-ring. I installed a large spliced O-ring in a hyperbaric chamber door that was spliced. I was told the splice is cut at an angle with a special cutter and then glued with a very good glue that is stronger then the O-ring material or the same as. 
>  
> The larger cross section O-ring I used on the hyperbaric chamber had a lower durometer reading then most smaller cross section O-rings used on subs. But I would suspect the larger cross section O-rings used on Kraka and Euronaut have a low durameter reading as well, to help seal the flanges easier if there are imperfections in a large flange, like I had on my chamber door. Also a larger cross section O-rings will give you more distance of travel between the flange surfaces before the flanges bottom out when comparing O-rings with the same hardness and/or type of material.
>  
> Regards,
> 
> Brent Hartwig
> 
> 
> Date: Wed, 8 Aug 2007 19:39:56 -0700From: cliffordredus@sbcglobal.netSubject: Re: [PSUBS-MAILIST] Double O-Ring On A HatchTo: personal_submersibles@psubs.org
> 
> 
> 
> 
> 
> Brent,
>  
>  
> I concur with Vance, Carsten and Peter ..., a single o-ring with the correct hardness is the way to go.  See technical note http://www.satoriseal.com/Technical/introduction_to_o-rings.htm on how o-ring is design to move within it's machined grove under pressure to seal.  Hatch upper and lower faces need land face to face.    If you are designing a hatch, pick a standard size so that you do not have to introduce a splice.
>  
> Cliff Great works are performed not by strength but by perseverance. Samuel Johnson 
> 
> ----- Original Message ----From: Brent Hartwig <brenthartwig@hotmail.com>To: PSUBSorg <personal_submersibles@psubs.org>Sent: Tuesday, August 7, 2007 11:31:47 PMSubject: [PSUBS-MAILIST] Double O-Ring On A Hatch
> 
>  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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