Specifies the importance class as designated by the type of gas, storage capacity (W), and distance of the transmission pipe layout (X). Select Ia, I, II, or III.
The importance class determines the importance factor (β1.).
|
Importance |
---|---|
Ia |
1.00 |
I |
0.80 |
II |
0.65 |
III |
0.5 |
Source: Seismic Design Standard for the High Pressure Gas Facilities, MITI Notice No. 515 dated Oct. 26, 1981. METI Amended Notice No. 250 dated Nov 29, 2013. High Pressure Gas Safety Institute of Japan (KHK), Seismic Design Guideline for the High Pressure Gas Facilities to the 2012 edition, newest revision Sep 25, 2015.
When β1x β1 is less than 0.33, the value of β1 shall be 0.33.