<div dir="ltr"><div>Hi Hugh & Alan,</div><div>Good point to consider, but it would depend on the flashpoint of the oil.  SCUBA compressors do the exact combination of pressure/air/oil and don't explode.  Diesel engines do too - sort of, anyway.  Mineral oil designed for compressors would be a good option although pricey (AU$200 for 20L recently). Shell Corena P150 mineral oil is what I use.</div><div><br></div><div>High pressure air is a mechanical hazard to be considered in and of itself.  I'd highly recommend installing a relief valve (or device) on any test chamber or other vessel.</div><div><br></div><div>Cheers,</div><div>Steve</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 21, 2017 at 2:28 PM, Hugh Fulton via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-NZ" vlink="purple" link="blue"><div class="m_-331964700394927430WordSection1"><p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri","sans-serif";font-size:11pt">Alan,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri","sans-serif";font-size:11pt">Never pressurise oil with air to those pressures.  An explosion waiting to happen.  Oxygen partial pressures!!<u></u><u></u></span></p><p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri","sans-serif";font-size:11pt">If you want to do it use nitrogen.<u></u><u></u></span></p><p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri","sans-serif";font-size:11pt">Hugh<u></u><u></u></span></p><p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri","sans-serif";font-size:11pt"><u></u> <u></u></span></p><div><div style="border-width:1pt medium medium;border-style:solid none none;border-color:rgb(181,196,223) currentColor currentColor;padding:3pt 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Tahoma","sans-serif";font-size:10pt">From:</span></b><span lang="EN-US" style="font-family:"Tahoma","sans-serif";font-size:10pt"> Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">personal_submersibles-<wbr>bounces@psubs.org</a>] <b>On Behalf Of </b>james cottrell via Personal_Submersibles<br><b>Sent:</b> Wednesday, 21 June 2017 3:34 PM<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re: [PSUBS-MAILIST] Pressure Test Chamber<u></u><u></u></span></p></div></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3735"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt">Alan,<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3749"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt"><u></u> <u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3751"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt">Pressure testing that high needs to be done with liquid not gas. High pressure air is VERY dangerous. A pressure washer pump using water would be a safer choice.<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3779"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt"><u></u> <u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3778"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt">Greg<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3719"><p class="MsoNormal" style="background:white;margin-bottom:12pt"><span style="color:black;font-family:"Verdana","sans-serif";font-size:10pt"><u></u> <u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3771"><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3770"><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3769"><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3775"><div align="center" class="MsoNormal" style="background:white;text-align:center"><span style="color:black;font-family:"Arial","sans-serif";font-size:10pt"><hr width="100%" size="1" align="center"></span></div><p class="MsoNormal" style="background:white"><b><span style="color:black;font-family:"Arial","sans-serif";font-size:10pt">From:</span></b><span style="color:black;font-family:"Arial","sans-serif";font-size:10pt"> Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br><b>To:</b> <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a> <br><b>Sent:</b> Tuesday, June 20, 2017 9:01 PM<br><b>Subject:</b> [PSUBS-MAILIST] Pressure Test Chamber</span><span style="color:black;font-family:"Helvetica Neue""><u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3768"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue""><u></u> <u></u></span></p><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3774"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">I am making a plastic container to fill with water & stand inside my<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">pressure chamber. There is a gap between the wall of the container<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">& the chamber which I intend to fill with oil. There will be about an<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3773"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">inch of air at the top of the chamber & I'm using a scuba tank to<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3772"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">pressurise the unit up to 3000psi.<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">Will car engine oil do to fill the gap between my plastic container &<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">the chamber wall, or do I need to go with a hydraulic fluid.<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">Am using the plastic container to keep water from rusting my test<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">chamber. (Aussie Steve's idea)<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">Cheers Alan<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue""><u></u> <u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">Sent from my iPad<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">______________________________<wbr>_________________<u></u><u></u></span></p></div><div id="m_-331964700394927430yui_3_16_0_ym19_1_1498015667083_3780"><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue"">Personal_Submersibles mailing list<u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue""><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><u></u><u></u></span></p></div><div><p class="MsoNormal" style="background:white"><span style="color:black;font-family:"Helvetica Neue""><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></span></p></div><p class="MsoNormal" style="background:white;margin-bottom:12pt"><span style="color:black;font-family:"Helvetica Neue""><u></u> <u></u></span></p></div></div></div></div></div><div id="m_-331964700394927430DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><p class="MsoNormal"><u></u> <u></u></p><table class="m_-331964700394927430MsoNormalTable" style="border-width:1pt medium medium;border-style:solid none none;border-color:rgb(211,212,222) currentColor currentColor" border="1" cellpadding="0"><tbody><tr><td width="55" style="padding:9.75pt 0.75pt 0.75pt;border:currentColor;width:41.25pt"><p class="MsoNormal"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" target="_blank"><span style="text-decoration:none"><img width="46" height="29" id="m_-331964700394927430_x0000_i1026" src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" border="0"></span></a><u></u><u></u></p></td><td width="470" style="padding:9pt 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