6　Process Steel Structure Parts

6.1　General Requirements

6.1.1　This chapter is applicable to fabrication，installation，welding，bolted connection and coating engineering construction of blast furnace，internal combustion，external combustion and top combustion hotblast stoves，smelting reduction ironmaking furnace，shell of dust remover，frame of furnace，charging skew bridge，charging corridor，gas cleaning equipment，plant and in-plant large-diameter coil-welded steel pipe，and other affiliated process steel structure.

6.1.2　Detail design shall be conducted for the fabrication of process steel structure and combine with fabrication，packaging，transportation and installation.Detail design shall comprise dimension，quantity，installation position and welding quality requirements of lifting lugs for transportation and lifting and scaffold lugs for installation.

6.1.3　For delivery of large members，such as shell，frame，corridor and truss，the center of gravity and suspension point shall be marked in an appropriate place.

6.1.4　Deformation of members and coating shedding due to transportation，stacking and lifting of members shall be rectified and repaired.

6.1.5　No residues and contaminants shall exist in installed box beam and pipes.The external surface of the member shall be clean and be free of contaminants.

6.1.6　Welders who fabricate and install the process steel structure must have passed examination and have gotten certificates of qualification.The welders with work permits must only weld items passing the examination within the approved range.