According to API 505 (figure 104), the radius of source is 7.5m when gas pressure is above 1900kPa and the road must not be encroached. Unfortunately, there is no enough space to remove road according to radius of source rated 7.5m. Thus the radius of source we adopted is 3m which indicated in ITB document then there will be enough space to remove road.
miaojinniu
remark
When get the detailed information, the accurate classification will be added.
