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Hi Jack and Kondo,<o:p> </o:p></p>
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Last week, George Jacobs picked up the prototype regulator panel from TEDF to investigate the leak issue. George discovered that the regulator is defective, with a significant leak from the built-in relief circuit. George confirmed this defect on two of the
three regulators that were purchased. DSG will order a version of the regulator that does not have the built-in relief circuit. Since the panel has an appropriate relief valve installed on the input of the regulator, the built-in relief circuit is not needed.<o:p> </o:p></p>
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The prototype gas distribution system uses Legris LF3000 series push-to-lock fittings, which were selected due to its compatibility with both nylon and polyethylene tube (<a href="https://www.jlab.org/sites/default/files/dsg/techDocs/19D040_1.pdf">Legris LF3000
specification</a><span class="MsoHyperlink" style="color:rgb(5, 99, 193);text-decoration:underline">)</span>. Chuck Long noted a reduction in leaks after swapping out a nylon gas line with a polyethylene gas line. Due to the reduction of the leaks with the
polyethylene tubing, DSG is replacing all tubing used for the gas panel connections with polyethylene, including the ½” line section.<o:p> </o:p></p>
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DSG has submitted a PR for the new tubing (PR <a href="https://misportal.jlab.org/reqs/pr/viewPr.do?prNum=400042P" target="_blank">
400042P</a>) and is generating a PR for the regulators.<s style="text-line-through:double"><o:p></o:p></s></p>
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Regards,<o:p> </o:p></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:"Calibri", sans-serif">
Marc<o:p> </o:p></p>
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