... drilling Rigs,drilling machinery Model:ZJ50D, ZJ70D Nominal drilling depth, m:5000,7000. 1)DC Rig adopts AC-SCR-DC drive ... requirement for TDS installation.....Parameter. Rig ModelZJ50DZJ70DNominal drilling depth, 127mm(5)DP,m50007000Max. hook load, kN(t)31503154500450dill line system ... 3150(700000)4500(1000000)Racking board height, m24.5, 25.5, 26.524.5, 25.5, 26.5SubstructureType DZ315/9-S DZ450/9(10 ...