Date of work:
19, July, 2023
 
Workers:
Kimura, Yasui and M. Takahashi
 
Abstract:
We pressurized OMC and OMMT atmospheric pressure for repair work.
The following is a record of the opening and closing of valves and the pressure of the pressurization process.
  
10:37  Pressure in the OMC: 5.5 x 10^-5 Pa
           TMP and dry-pump: turned "OFF"
13:28  Pressure in the OMC: 3.8 x 10^0 Pa
13:29  Pressurization was  started by G-2class grade air  (klog-25912) . 
13:31  Pressure in OMC was 2.1 x 10^2 Pa
13:36              "    9.8 x 10^2 Pa
13:57              "    5.5 x 10^3 Pa 
14:09              "    7.9 x 10^3 Pa
14:13               "   9.2 x 10^3 Pa 
            Increased air flow
14:18              "    1.0 x 10^4 Pa
14:27              "    1.2 x 10^4 Pa
14:59              "    2.0 x 10^4 Pa
            Increased air flow
15:52              "    5.9 x 10^4 Pa
15:54              "    6.4 x 10^4 Pa
16:04              "    7.4 x 10^4 Pa
16:09              "    7.9 x 10^4 Pa
16:15              "    8.4 x 10^4 Pa
16:25              "    9.3 x 10^4 Pa
16:30 The pressurization process is terminated because the pressure in the OMC has reached atmospheric pressure.
The volume of high-purity air used was approximately 6.56 m^3 (atmospheric pressure equivalent).