<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV><BR>Rick, Have you encountered the problem of galling when screwing together two ss pipe fittings? I recently put two together without any Teflon tape and when I hade to take it apart I basically destroyed the 1" ss nipple. </DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Rick Patton via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] gasket test results<BR>Date: Wed, 8 Jul 2015 07:22:56 -1000<BR><BR></DIV><DIV dir="ltr">Good luck on your upcoming test Hank. How are you launching your barge once it gets there to the dive spot?<DIV>While on the subject of gaskets and 0 rings, I have some subcon and blueglobe threw hulls. Sub Subcons of course have an O ring that sits in a groove and is screwed into a threaded ss plug that is welded into the hull. I have two concerns,1) how do I know when to stop tightening it as it won't be able to compress with depth and 2) I would think that the O ring might distort with the screwing motion as it snugs down. My preference would be to drill out the ss threw hull plug so that the threaded shaft of the Subcon would just pass threw and then put a backing nut on the inside to compress it but then the hull plug would have to be in my mind too thin to be able to get a nut on it. On the Blueglobes, how do you know when it is snugged enough without doing any damage to the fitting?</DIV><DIV><BR></DIV><DIV>Rick</DIV></DIV><DIV><BR><DIV>On Wed, Jul 8, 2015 at 2:15 AM, hank pronk via Personal_Submersibles <SPAN dir="ltr"><<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>></SPAN> wrote:<BR><BLOCKQUOTE style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">I did my testing this morning and found some scary results. I bonded EPDM gasket material to my port test chamber and tested a port to 500 psi. The gasket extruded about 1/16 of an inch. When I greased the surface of the gasket and pressured it to 500 psi, the gasket extruded 1/2 inch. When the pressure is released the gasket returns to its original position.<BR>
When the same test is done without bonding, I get the same result.<BR>
<BR>
My next test will be with the bearing surface machined to create tiny ridges for traction.<BR>
Hank<BR>
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