Date of work:
23, Apr, 2026
Workers:
Kimura and Tomaru
Abstract:
We pressurized SRM atmospheric pressure for the investigation of outgassing source in SRM (k-log 36811).
The following is a record of the opening and closing of valves and the pressure of the pressurization process.
The same process is used for k-log 26030. It is noted here for reference.
~9:50 GVoomt Close
Set safety valve to SRM vacuum pump unit
Turn on main SW of TPM (Not acceration, only raise the rotor blades to protect the TMP)
9:55 Pressurization was started by G-2class grade air (klog-25912). Cylinder is filled with 7 m³ of compressed dry air.
Pressure inside SRM was 1.7 x 10^1 Pa Cylinder pressure 15.2 MPaG
10:00 " 2.1 x 10^3 Pa
10:22 " 3.7 x 10^3 Pa
10:33 " 4.2 x 10^3 Pa Cylinder pressure 14.2 MPaG
10:40 " 7.8 x 10^3 Pa
10:55 " 1.6 x 10^4 Pa Cylinder pressure 11.9 MPaG
11:21 " 3.3 x 10^4 Pa " 8.9 MPaG
11:30 " 3.9 x 10^4 Pa " 7.9 MPaG Increased air flow (Secondary pressure 1.1 kg/cm^2G)
11:34 " 4.1 x 10^4 Pa " 7.5 MPaG
11:54 " 5.3 x 10^4 Pa
12:12 " 6.4 x 10^4 Pa
12:12 " 6.4 x 10^4 Pa
12:19 " 6.9 x 10^4 Pa
12:27 " 7.4 x 10^4 Pa Cylinder pressure 2.0 MPaG
12:34 " 7.8 x 10^4 Pa " 1.1 MPaG
Change to a new cylinder filled with 7 m³ of compressed dry air
12:41 " 7.9 x 10^4 Pa Cylinder pressure 15.2 MPaG
12:45 " 8.1 x 10^4 Pa " 15.1 MPaG
12:53 " 8.4 x 10^4 Pa
12:58 " 8.9 x 10^4 Pa
13:02 " 9.0 x 10^4 Pa " 13.2 MPaG
13:04 " 9.1 x 10^4 Pa
13:07 " 9.4 x 10^4 Pa " 12.6 MPaG
13:10 " 9.6 x 10^4 Pa
13:11 " 9.7 x 10^4 Pa
The pressurization process is terminated because the pressure in the SRM has reached almost atmospheric pressure at 13:11.
Based on the volume of dry air, the internal volume of the SRM was estimated to be approximately 9 m³.