7　Installation of Hood

7.1　Skirt of Hood

7.1.1　The skirt should be lifted in place prior to installation of converter.

7.1.2　The lifting device for skirt shall be installed according to the following requirements:

1　The lifting device shall be positioned based on the center of converter.The longitudinal and horizontal center lines shall be adjusted，and the measurement by plumb wire should be carried out，with the allowable deviation of 3.0mm.

2　For the installation of hydraulic lifting mechanism，the relative elevation difference of four hydraulic cylinders shall be adjusted，and the measurement by optical instrument or a ruler should be carried out at the center of its upper cardinal axis with the allowable deviation of 3.0mm；the verticality of these cylinders shall be adjusted，and the measurement by suspension wire should be carried out in case that its upper and lower cardinal axes are at the same vertical line，with the allowable deviation of 2.0mm.

3　For the installation of mechanical hoist-type lifting mechanism，the levelness of its winding drum's drive shaft shall be adjusted，and the measurement by leveler should be carried out，with the allowable deviation of 0.15/1000.The assembly of drive couplings should be checked by centesimal meter，feeler gauge and steel ruler and its allowable deviation shall meet the requirement of current national standard of General Code for Construction and Acceptance of Mechanical Equipment Installation Engineering GB 50231.

7.1.3　The skirt shall be installed according to the following requirements:

1　It shall be positioned based on the center of converter.The longitudinal and horizontal center lines shall be adjusted，and the measurement by plumb wire should be carried out，with the allowable deviation of 3.0mm.

2　The elevation shall be adjusted，and the measurement by ruler or optical instrument should be carried out，with the allowable deviation of±5.0mm.

3　The levelness shall be adjusted，and the measurement by leveler or optical instrument should be carried out at the top edge of the skirt，with the allowable deviation of 1.0/1000.

4　The clearance between the idler pulley and the guide pin shall be adjusted，and the measurement by feeler gauge should be carried out，with the allowable deviation of 2.0mm.

7.1.4　During installation，the sealing device shall be checked and adjusted in accordance with the requirement of the design technical document.

7.1.5　During installation，the water cooling system shall be checked，and be subject to the hydrostatic test according to the requirement of the design technical document.