|
Hi Hugh, Well if I can at least entertain, I've done some thing positive. Ya win some, ya loose some as I like to say from time to time as I'm chasing deere throught the woods. ;} In any case I think the concept might at least work well for low pressure service in hyperbaric chambers that are going to less the 30 psi. Getting those big plate doors and there flanges is spendy. My hatch plate and hatch land in the concept are not machineded flat. You can have a bit warp in one or both of them, and since I'm seating the upper sealing rings at first in uncured urethane, you could still get a matching sealing surface. That was the point of the design. The rings are just rolled for a few dollars are you local metal supplier. No machining, just some grinding, sanding and welding. Not perfect, but a propane tank persubbers dream. Should we psubbers be flustered if are postings get countered? I don't believe so. It's why I post, personally. Should we expect a new, or some what new idea to be fully figured out and proven functional, when it's first posted? I don't believe so. I very much enjoy a think tank discustion from time to time. Doe's it need to be all worked out in less then three days? Regards, Szybowski From: hc.fulton@gmail.com To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] No Machining Hatch Sealing Concept Date: Tue, 8 Sep 2009 05:49:31 +1200 Hi Brent, You have come up with some innovative ideas and it is great to explore them. How are you making the flanges? From your drawings they look as though they are machined flat with some nice chamfers etc. The new cutting Rings you have made look as though they are machined or how would you make them. It appears you are making a machined “non machined” hatch design. Where are you going with this? I think you deserve a prize for entertainment!! Looking forward to meeting you at P-subs. Cheers, Hugh
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
From: cody_mcmillan@hotmail.com From: brenthartwig@hotmail.com This is an idea I've been wanting to make some CAD models and drawings of for some time now. We have this big oval or rectangle steel plate doors for the hyperbaric chambers, and it's expensive to machine the doors and seating flanges flat, plus cut the O-ring groove. Even then the welded in door frame can and usually warps some. Once welded in the door frame is very hard to machine. The concept shown in the below pictures and drawings, is showing a K-350 type hatch and hatch land, that have two rolled 1/4" SS rod rings, that are TIG welded onto the hatch flange, and two on the hatch land. The two on the hatch land are to form a dam for Sekaflex, that you caulk in there and level off. Then to allow the upper SS rings to seat down into the Sekaflex enough to take up any warp in both flanges and not stick to the Sekaflex while it is curing, you apply mold release to the SS rings, and then spray them with PVA mold release agent and let that dry. Then before the Sekaflex is caulked into the lower rings, you lower the hatch and figure out what spacers you need to keep if from going down to far into the urethane. Then add the Sekaflex of the type of hardness you want, and lower the hatch, which is attached at the hinge to keep every thing lined up, and set the hatch down on your taped or clamped on spacers, and let it cure.
One could use just one upper SS sealing ring as you can see in the drawing of a large WWII ballast tank flapper valve. But I like the primary and secondary sealing means, and it evens out the stresses more.
" Stand still. The trees ahead and bush beside you are not lost." ~ Albert Einstein
Regards
Click less, mail more: Hotmail on the new MSN homepage! |