Height of drill floor:6(20),7.5(25),9(30),10.5(35),12(40)m (ft) Stand load rating:1150,1600,2200,2880kN Design Features:1).Three kinds of substructures:box-on-box, two-step raising & sing-lift2).The box-on-box structure: the front platform is suitable for installing standard BOP and the rear platform for installing heavy main drawworks and transmission groups3).The two-step structure: the ...