Displaying report 1-1 of 1.
Reports until 14:02, Tuesday 19 May 2026
LHO VE (VE)
jordan.vanosky@LIGO.ORG - posted 14:02, Tuesday 19 May 2026 (90283)
LN2 Dewar Inspection 5/19/25 and Vacuum Jacket Pressures

A Norco tech came to the site to inspect the 8 LN2 dewars that feed the cryopumps. Inspection report will be posted to Q2000008 once received.

- No major issues found, some small leaks were repaired as they were found. The tank safeties and burst disks are due for replacement soon, since they should be replaced every 5 years.

The vacuum jacket pressures were also measured during inspection:

The vacuum jackets were all pumped down to <10 mtorr last May (excluding CP4 which is not in use), see alog 84290

Dewar Pressure (micron/mtorr)
CP1 22
CP2 20
CP3 110
CP4 (not in service) 350
CP5 11
CP6 10
CP7 26
CP8 24
Displaying report 1-1 of 1.