Overview 1 according to E101, manufacturing and inspection technology conditions and the provisions of the JB/T3595-2002. 2, valve test according to JB/T3595-2002 and JB2640-81 regulation, valve seal test monk seal test pressure according to the provisions of the JB/T3595-2002. 3, the structure length according to the size of E101 rules or provide. 4, welding groove or as stipulated in the power industry management standards 78 dg users with size.