<div dir="auto">Hi guys, common industry practice here in Australia is to use Teflon tape for HP tapered thread connections, including for  HP oxygen (but using oxygen clean tape). Using sealant alone I can tell you from personal experience it's very hard to get a bubble-tight seal and stainless on stainless threads will gall up more often than not. I use thin oxygen clean tape from Western Enterprises (USA) and do 6-10 tight wraps.<div dir="auto"><br></div><div dir="auto">Cheers,</div><div dir="auto">Steve Fordyce</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 30 Dec 2017 3:05 pm, "Alan via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Noticed when visiting Nuytco that they used thread tape on their O2</div><div id="m_1256553146381283648AppleMailSignature">supply to their bellows add system. Wondered about it at the time as I thought it would be inflammable. There is a high pressure gauge showing here so looks like they are using tape on the high pressure O2 line.</div><div id="m_1256553146381283648AppleMailSignature">Alan</div><div id="m_1256553146381283648AppleMailSignature"><br></div><div id="m_1256553146381283648AppleMailSignature"><img src="cid:2306B160-2B97-4A59-B6FE-3D0964772A2C" alt="image1.JPG" id="m_12565531463812836482306B160-2B97-4A59-B6FE-3D0964772A2C"><br><br>Sent from my iPad</div><div><br>On 30/12/2017, at 2:34 PM, Hugh Fulton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div class="m_1256553146381283648WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Like Brian and Hank,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> Thread tape 2-1/2 turns and anti-seize. Don’t put on too much tape. Don’t leave tape hanging over the thread end as it will end up in the system.  Start about ½ a thread back.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> I tried Loctite many years ago with bad results but that was with natural gas.  We do high pressure gas for a living. White tape for air and yellow for gas.  Yellow is generally thicker.  Some cheap white tapes are really thin so compensate.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="https://northerncal.swagelok.com/blog/bid/88017/skill-applying-ptfe-tape-to-tapered-pipe-threads" target="_blank">https://northerncal.swagelok.<wbr>com/blog/bid/88017/skill-<wbr>applying-ptfe-tape-to-tapered-<wbr>pipe-threads</a><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hugh<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Personal_Submersibles [<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">mailto:personal_submersibles-<wbr>bounces@psubs.org</a>] <b>On Behalf Of </b>Brian Cox via Personal_Submersibles<br><b>Sent:</b> Saturday, 30 December 2017 1:57 PM<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re: [PSUBS-MAILIST] High Pressure Air System Thread Sealants<u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Steve,   I used just Teflon tape and I had some tiny leaks.  I would recommend using the Teflon tape and also a viscous product such as Never-seize.  I had to back everything out and re-do all my fittings just for piece of mind.  In addition the Never-seize is good for stainless to stainless fittings.  I didn't have any leaks after that.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Brian<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br>To: Steve McQueen via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br>Subject: Re: [PSUBS-MAILIST] High Pressure Air System Thread Sealants<br>Date: Sat, 30 Dec 2017 00:02:14 +0000 (UTC)<u></u><u></u></span></p></div><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif"">Steve,<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif"">Tread tape has worked reliably for me for many years and projects.  I tried a liquid product one time and it was garbage.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif"">Hank<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif""><u></u> <u></u></span></p></div><div><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a">On Friday, December 29, 2017, 4:14:23 PM MST, Steve McQueen via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote: <u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a"><u></u> <u></u></span></p></div><div><div><div><div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a">All, I am starting to plumb together my K250 HP Air distribution system (3,500 psi). Looking for feedback. <u></u><u></u></span></p></div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a">For the NPT connections I am choosing a LOCTITE product:<u></u><u></u></span></p></div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a"><u></u><u></u></span></p></div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a">I’ve read Teflon tape technically isn’t the best for HP applications but I’ve seen it used.  Anyone have a proven best practice?<u></u><u></u></span></p></div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif";color:#26282a">Thanks,<u></u><u></u></span></p></div><p><span style="font-size:10.0pt;font-family:"Helvetica Neue","serif"">Steve <u></u><u></u></span></p></div></div></div><p class="MsoNormal">______________________________<wbr>_________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>______________________________<wbr>_________________ Personal_Submersibles mailing list <a href="http:///eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a> <u></u><u></u></p></div></div></blockquote><blockquote type="cite"><div><span>______________________________<wbr>_________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a></span><br></div></blockquote></div><br>______________________________<wbr>_________________<br>
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