[Kimura, M. Takahashi and Sawada (Hokuto)]
We presuurized IXC up to 3.2 x 10^4 Pa with G-2 class grade air on 22th/Apr.
The specifications of the high-purity air (G-2 grade) used are in klog-25912 for reference;
Detailes are as followes;
1. Start injection the G-2 grade air into IXC
10:15 Start injection
10:45 2.1 x 10^3 Pa
11:40 6.5 x 10^3 Pa
13:16 1.3 x 10^4 Pa
14:50 2.4 x 10^4 Pa
16:10 3.2 x 10^4 Pa. Stopped injection.
2. We will re-start injection on on 23rd/Apr. morning.
[Kimura, M. Takahashi and Sawada (Hokuto)]
We restarted presuurization of IXC up to 7.8 x 10^4 Pa with G-2 class grade air and G-2 class grade N2 on 23th/Apr.
Detailes are as followes;
1. Re-start injection the G-2 grade air into IXC
8:34 Start injection at 3.2 x 10^4 Pa
10:25 4.2 x 10^4 Pa
11:34 5.5 x 10^4 Pa
11:59 5.7 x 10^4 Pa
13:06 6.6 x 10^4 Pa
13:54 7.1 x 10^4 Pa
14:41 7.8 x 10^4 Pa.
Stopped injection.
2. Injection is resumed on the morning of April 24.
After completion of pressurization to atmospheric pressure, repair of flange leaks will begin.
The amount of gas used for pressurization to 7.8 x 10^4 Pa was pure air (7 m^3 x 7 bottles, total 49 m^3)
and pure nitrogen (7 m^3, 1 cylinder).
[Kimura, M. Takahashi and Sawada (Hokuto)]
We restarted presuurization of IXC up to 9.8 x 10^4 Pa (~ atmospheric pressure) with G-2 class grade air on morning of 24th/Apr.
Detailes are as followes;
1. Re-start injection the G-2 grade air into IXC
9:45 Start injection at 7.8 x 10^4 Pa
10:23 8.3 x 10^4 Pa
11:09 8.9 x 10^4 Pa
11:45 9.5 x 10^4 Pa
12:58 9.8 x 10^4 Pa.
Stopped injection.
2. After completion of pressurization to atmospheric pressure, repair of flange leak was done. k-log 29305
3. The amount of gas used for pressurization to 9.8 x 10^4 Pa from 2.3 x 10^2 Pas was 70 m^3.
The breakdown details of the gases used for the vacuum breaking of IXC are as follows:
63 m^3 of high purity air (7 m^3 x 9 bottles, total 63 m^3) and 7 m^3 of high purity nitrogen (7 m^3, 1 cylinder) for a total of 70 m^3.