ELOG Solenoid

Solenoid logbook

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Entry time:	Wed Jan 15 13:12:06 2025
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> From about 08:00 to 15:00 > > See Doug's previous entry for quench recovery details. > First the system had been set to // cold return mode because the solenoid > temps seemed low enough. Temps started to rise instead of cooling so system > was eventually set back to // warm return mode. With the system in // warm > return mode the solenoid was still warming instead of cooling. Solenoid > temps were rising to almost 50K and T1 shield heater was about 90%. T1 > inlet temp was below 75K and falling even with shield heat set so high. > CV155 kept closed and // warm return flows were full flow. T1 brake valve > seemed way too open at about 0.8 (compared to previous runs). > > 15:00 to 19:00 > > Tried opening CV155, didn't seem to help much. Temps still trending > upwards. Decided to reduce flow to solenoid to see if the cold box would > cool down. Started reducing the // warm return outlet valves. TI121 began > to drop slowly. On graph plotting solenoid temps they started to trend > downwards. Weird. A reduced flow seemed to produce more cooling ? Don't > understand this but will continue. Flow temps returning from solenoid were > about the same temp as TI121, about 35 K. Switching to // cold return mode > to try to reduce TI121. Keeping CV155 as open as possible, just keeping > CV204 from closing completely. After switching to // cold return TI121 > starts to slowly fall, T1 inlet temp rises over time so start to drop > shield heater setting. Solenoid temps now trending downwards. Cracked open > CV142 to get some flow going through powerleads. Raised compressor > discharge press to about 11.2 barA. Shield heater down over time to about > 10%. Reduced CV155 down to the point where temps almost stop falling then > open cv155 just enogh to keep temps falling. > > 19:30 Solenoid temps down to about 28K. Letting system continue cooling > overnight. > > Guessing the cause of the turbine overspeed quench was caused by > contamination entering the spinning turbine, causing rapid speed changes or > possibly the continued saga of the water damaged Jaquet turbine speed > tachometer giving random false trips. Encoding: HTML ELCode plain Suppress Email notification

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