... depth,7000m, 2)Hook load, 4500kN, 3)Drawwork power,2000kw, 4)Auxiliary brake:E.T. N brake ZJ70/4500D rig is ... are drived with 2 sets of motors separately. The front open mast and the helicospiral substructure are raised and dropped by ... )Drill Floor Height ft(m)11.5(3.5), 15(4.5)16(4.8)25(7.5)30 (9)30(9) , 35 ... )Mast Type and Mast Beight ft(m)A-shaped mastfront- open K type mast112(34)138 (42)141 (43)148 ( ...