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RE: [PSUBS-MAILIST] O-Rings & Acrylic Ports



Brent,

I am not hammering on you; this is the same message that others keep passing out when questions come up as to ports and domes.  If you check the archives for over the past year, one or more persons would request that the inquirer refer to the manual.  I provided a partially correct answer initially because I didn’t climb up on my drafting board and drag out the tome.  I then had to climb back up there to get the book down a second time to give you another answer.   Get the book out first and then ask the list its opinion based upon your research.  Since James has a copy, he could have done the research (this is not meant to reflect negatively of James).  Your finances, personal issues, and priorities were not an issue here.  I gave you a straight answer, you are being overly sensitive.  Let us not get in another flame war…if you ask questions, be prepared for the variety of answers you receive otherwise people stop giving of their time.

Jay

 

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

 

Talk sense to a fool and he calls you foolish.

    - Euripides (484 BC - 406 BC)

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Sent: Sunday, August 31, 2008 1:24 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] O-Rings & Acrylic Ports

 

Please lighten up Jay.

I have a different life and different priorities then you, and likely always will. You learned something new because I brought up the subject to the group, and you have had the book for quite some time. For some time now my hobby money has been quit limited, for personal reasons I'm not going to discuss with you. So what hobby money I did have available, I saved for quite some time to purchase the item that was at the top of my list. That item was the K-250, I'm now the proud owner of. I can purchase the Stachiw book at any time when I'm ready to do so. But I might of missed out on the K-250 if I didn't focus on that goal. I plan to purchase the Stachiw book after I acquire my TIG welder that is higher in my list. 

Further more, James and I both wanted to see what the group thought of the ideas that had been worked up to that point in those models and drawings, and he has Stachiw's book.

Your resident pipe dreamer   ;)'

Regards,

Szybowski

 


From: bottomgun@mindspring.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] O-Rings & Acrylic Ports
Date: Sat, 30 Aug 2008 17:49:22 -0400

Brent,

As numerous people have stated before, get Stachiw out.  For a port see page 257 where he has various diagrams for mounting which include some similar to what you are describing.  Generally if you need to do something with port and domes, it is in Jerry’s book.  If you don’t have a copy, you need to get one (which has also been stated numerous times also).

R/Jay

 

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

 

Talk sense to a fool and he calls you foolish.

    - Euripides (484 BC - 406 BC)

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Sent: Saturday, August 30, 2008 3:50 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] O-Rings & Acrylic Ports

 

Hi All,

Thank you for the good data to chew on guys. When I was working on different dome and flat viewports in the past, I didn't know about the hard neoprene type gaskets, and that it was considered a good option in some applications. I was interesting in another way to seal a dome or flat viewport that wasn't glued in, in such a way that it was hard to remove for maintenance and/or replacement. I now wish to use the hard gasket type seals in several applications.

Do you think there would be any advantage to adding a small raised lip to the inside of the hard gasket in the dome or flat viewport seating flange? I was thinking it might be useful to keep the gasket from extruding in towards the interior. But since there is so many square inches of surface area on the exterior of the dome and/or flat viewport, much of it pushing down.  I figure that there is far more pressure being transfered down to the domes or flat viewports seating surface then is being applied to the very small surface area on the outer most edge of the gasket.

The configuration I was thinking of would have a small gap between the lip and the dome, say 1/8", and the gasket would be cut to fit tight against that lip. this way the gasket wouldn't have room to move and the dome wouldn't be affected by the lip. That grove that would be created would get condensation water running into it and might be a little hard to clean, but there might be a way to install a very soft gasket type seal in that groove to deal with that issue. To add a small lip in the interior of a flat viewport seat would be a little different and would need to be in my opinion, shorter to as to not ever touch the flat acrylic viewport under full rated pressure. So in that configuration one might want a thicker hard gasket.

The viewports seat being distorted from welding, I believe is a very good point. This is why I was thinking about a way to make a poured type gasket, and in some way coat, wax, etc. the viewport so you can remove it after the gasket has cured. Then clean the viewport and install it for the final time in the orientation it was when the gasket was formed. Perhaps the orientation will not be a issue. This way you have a custom gasket that is not glued to your acrylic. This is what I was thinking about doing for my front lower viewport on my K-250 that has a lightly pitted seating surface. I'll smooth the seating surface out a fair bit with epoxy paint, but even if I get it smooth, there could well be some welding distortions to deal with. One could use a couple light coats of PVA mold release agent sprayed on, and if the paper or plastic protective coating is still on or could perhaps be reapplied on the flat acrylic viewports, then that might be a good way to go. For the domes you could add some things like that as well.

Your resident pipe dreamer   ;)'

Regards,

Szybowski