[Dsg-halla_gas] GEM prototype panel update

[Marc Mcmullen]

Hi Jack and Kondo,
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.
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 (Legris LF3000 specification<https://www.jlab.org/sites/default/files/dsg/techDocs/19D040_1.pdf>). 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.
DSG has submitted a PR for the new tubing (PR 400042P<https://misportal.jlab.org/reqs/pr/viewPr.do?prNum=400042P>) and is generating a PR for the regulators.
Regards,
Marc

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