7.6　Installation of Stiffener

7.6.1　The permissible elevation deviation of circumferential stiffener shall not exceed 10mm，and the permissible levelness deviation shall not exceed 5mm.

7.6.2　The permissible verticality deviation of vertical stiffener shall not exceed 3mm.The permissible position deviation shall not exceed 10mm.

7.6.3　The distance between the welds connecting stiffener to the absorber body and the absorber body butt weld shall not be less than 200mm.