Contractor spent the day installing new components on all eight liquid nitrogen Dewar fill lines to bring skids up to industry standard. Components include check valve, pressure relief valve, strainer, and drain valve. At their recommendation, a support stand was installed and anchored into concrete upon hammer drilling holes. Corner and end station skids were completed before noon to minimize impact on observing.
Check valve = Nibco class 200 bronze T-453-B 1.5"
Drain valve = Rego Goddard T9454 1/2" F.NPT with BK9450R stem
Strainer = Mueller Steam Specialty LF352 1.5" with non-standard 100 mesh for cryogenic application
Pressure relief valve = rated for 350 psi
Picture of CP1 skid attached.
Note: the existing pressure relief valve just upstream of the control module safety valve on all skids, except CP1 skid, was removed to accommodate stack up length of new components
Worth noting that contractor purged pipe with gas N2 while brazing to prevent scaling on the inner surface.
The new strainer mesh is intended to prevent debris from entering the system, but does not filter ice. Contractor recommends cleaning it 2x/yr.