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<div>Hello,</div>
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<div>well why not using the idea of hydroforming :<br/>
http://www.colinfurze.com/hydroforming.html</div>
<div>Use a presssure washer with 200 bar and you got your 2900 psi...</div>
<div>By doing so you have no issue with expanding gases.</div>
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<div>Best regards</div>
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<div>Beram</div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Mittwoch, 21. Juni 2017 um 09:40 Uhr<br/>
<b>Von:</b> "Stephen Fordyce via Personal_Submersibles" <personal_submersibles@psubs.org><br/>
<b>An:</b> "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><br/>
<b>Betreff:</b> Re: [PSUBS-MAILIST] Pressure Test Chamber</div>
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<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>
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<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>
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<div>Cheers,</div>
<div>Steve</div>
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<div class="gmail_quote">On Wed, Jun 21, 2017 at 2:28 PM, Hugh Fulton via Personal_Submersibles <span><<a href="mailto:personal_submersibles@psubs.org" onclick="parent.window.location.href='personal_submersibles@psubs.org'; return false;" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:
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<p class="MsoNormal"><span style="color: rgb(31,73,125);font-family: Calibri , sans-serif;font-size: 11.0pt;">Alan,</span></p>
<p class="MsoNormal"><span style="color: rgb(31,73,125);font-family: Calibri , sans-serif;font-size: 11.0pt;">Never pressurise oil with air to those pressures. An explosion waiting to happen. Oxygen partial pressures!!</span></p>
<p class="MsoNormal"><span style="color: rgb(31,73,125);font-family: Calibri , sans-serif;font-size: 11.0pt;">If you want to do it use nitrogen.</span></p>
<p class="MsoNormal"><span style="color: rgb(31,73,125);font-family: Calibri , sans-serif;font-size: 11.0pt;">Hugh</span></p>
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<p class="MsoNormal"><b><span style="font-family: Tahoma , sans-serif;font-size: 10.0pt;">From:</span></b><span style="font-family: Tahoma , sans-serif;font-size: 10.0pt;"> Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" onclick="parent.window.location.href='personal_submersibles-bounces@psubs.org'; return false;" target="_blank">personal_submersibles-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</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: Verdana , sans-serif;font-size: 10.0pt;">Alan,</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: Verdana , sans-serif;font-size: 10.0pt;">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.</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: Verdana , sans-serif;font-size: 10.0pt;">Greg</span></p>
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<p class="MsoNormal" style="background: white;"><b><span style="color: black;font-family: Arial , sans-serif;font-size: 10.0pt;">From:</span></b><span style="color: black;font-family: Arial , sans-serif;font-size: 10.0pt;"> Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" onclick="parent.window.location.href='personal_submersibles@psubs.org'; return false;" target="_blank">personal_submersibles@psubs.org</a>><br/>
<b>To:</b> <a href="mailto:personal_submersibles@psubs.org" onclick="parent.window.location.href='personal_submersibles@psubs.org'; return false;" target="_blank">personal_submersibles@psubs.org</a><br/>
<b>Sent:</b> Tuesday, June 20, 2017 9:01 PM<br/>
<b>Subject:</b> [PSUBS-MAILIST] Pressure Test Chamber</span></p>
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<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</span></p>
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<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</span></p>
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<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</span></p>
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<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</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: "Helvetica Neue";">pressurise the unit up to 3000psi.</span></p>
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<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 &</span></p>
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<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.</span></p>
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<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</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: "Helvetica Neue";">chamber. (Aussie Steve's idea)</span></p>
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<p class="MsoNormal" style="background: white;"><span style="color: black;font-family: "Helvetica Neue";">Cheers Alan</span></p>
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