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Re: [PSUBS-MAILIST] 40 degree inclusive angle Vee clamps for Viewports

Brent,

The Perry viewport was installed in its own frame, machined to the port mating angle (about 113 degrees if memory serves). This had a bolted retainer ring and o-ring. Then the back of this entire assembly had a second o-ring which mated to a flat machined receiver ring welded into the hull. The bolted retention ring held the window and the V-clamp held the assembly to the hull. And we NEVER had a problem. Not once.

Of course, it's a heavy assembly by comparison to, say, Aquarius, which has a welded SS forging machined in the hull and took the window without extra parts. Perry used that kind of thing on the small hulls (PC8, PS2 and the 14 boats) mostly for weight saving. The 14s were both white, and they showed rust. Condensation would pool at the bottom edge of the port where it mated and seep underneath once you got back aboard ship. And the window was such a pain in the ass to pull that people didn't do it until they absolutely had to.

The real problem with these big windows is, in fact, getting them in and out for maintenance. Perry didn't use SS for any of that, so we had to tend the painted surfaces as needed, mostly during the annual overhaul. We used mil spec dimetcote, and that vinyl topcoat over the mega undercoat (with an epoxy tie coat, as I recall) was monumentally tough stuff. We just didn't have much problem with rust, period. When you're pushing these things for 250 to 350 dives a year, it needed to be. And it was. Of course, at $600/gallon, it better be!

Vance


-----Original Message-----
From: Brent Hartwig <brenthartwig@hotmail.com>
To: PSUBSorg <personal_submersibles@psubs.org>
Sent: Sun, 1 Mar 2009 3:31 pm
Subject: [PSUBS-MAILIST] 40 degree inclusive angle Vee clamps for Viewports



Very interesting Hugh,

   I've never really liked to have to drill bolt holes in the viewport seating rings. This gives me all sorts of ideas for large and small viewports. The one thing that comes to mind with these SS Vee clamps and the SS flanges they tighten down on, is that it creates a low oxygen mating surface that corrodes faster, like Jay mentioned a short time ago.  There doing it with the Deepworkers and on the Triton 1000s, so perhaps it's not enough of a problem or they are adding a coating of some sort.  

Regards,
Szybowski




From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] STANAG NATO standard flange
Date: Sun, 1 Mar 2009 19:29:33 +1300

That system of 40 degree inclusive angle Vee clamps are used on the Perry subs for large Viewports.
Try this lady from Teconnex as they make those clamps.  England. Anyone else have a source?
Ann.Nutter@teconnex.com
Hugh
 
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Sent: 01 March 2009 12:06
To: PSUBSorg
Subject: RE: [PSUBS-MAILIST] STANAG NATO standard flange
 


Jay,   I had been thinking about how the battery pod caps on the Triton 1000 were being attached, and figured it would be a lot like the beveled clamping means your talking about.  But using a small hinge like is used on these tri clover clamps we use at the winery to attach and seal hoses to tanks and what not.
 
http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Tri%20Clover%20Clamping%20Means
 
It's hard to make out the hinge on the Triton pods, but you can see one on the top of the starboard pod in this rendering of the sub if you look closely and the tightening bolt on the bottom.
 
http://www.msubs.com/Images/Triton%20Images/Triton%20-%202.jpg
 
http://www.msubs.com/Images/Triton%20Images/Triton%20-%208.jpg
 
http://www.msubs.com/Images/Triton%20Images/Triton%20-%204.jpg
 
http://www.winerygaskets.com/
 
 
High pressure tri clover clamps.
 
http://www.thevintnervault.com/index.php?p=view_product&product_id=1408
 
 

Regards,
Szybowski



From: bottomgun@mindspring.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] STANAG NATO standard flange
Date: Sat, 28 Feb 2009 16:58:20 -0500
Brent,
Did not look closely at the unit that was on our pier a short time ago but from inspection of the images, it looks like the mating unit is one or the other but not both.  The two-part clamping ring interfaces with beveled surfaces so that when the tighter it is drawn together, the more pressure is put on the flat mating surfaces.
R/Jay
 
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
 
As scarce as the truth is, the supply has always been in excess of the demand.
    -Josh Billings
 
 
 
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Sent: Saturday, February 28, 2009 4:51 PM
To: PSUBSorg
Subject: RE: [PSUBS-MAILIST] STANAG NATO standard flange
 


Jay,
 
So does that mean they can be locked by both a rotating ring type, as well as a two-part coupling flange, as it appears this DART unit can?     Are all the outer mating parts of the two-part coupling flange beveled so they increase the pressure on the seal further as the two clam shells are brought closer together?

Regards,
Szybowski


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