bubba.gateley@LIGO.ORG - posted 08:42, Friday 02 June 2017 - last comment - 11:33, Friday 02 June 2017(36611)
Faulty Pneumatic Regulator
The pneumatic regulator connected to the supply line for the cylinder on GV8 has failed. The cylinder was still getting enough pressure to hold the gate open. The ball valve used to isolate the pneumatic regulator is up stream of both GV 7 & 8 so I mechanically locked out both valves. I talked with Chandra and Kyle before I locked out the valves. I will fill out a FRS for to replace the regulator this morning and confer with Chandra before any pressure is applied. This also has ties to FRS 8259.
During this exercise both PT-134 and PT-114 cold cathode pressure gauges went out which seemed to correlate with inserting the stop pins which normally engage a limit switch when open. Do we have a grounding issue?
This sounds strange to me also.