drilling rig,DC drilling Rigs,drilling machinery Model:ZJ50D, ZJ70D Nominal drilling depth, m:5000, ... Hydraulic disk brake or band brake is used as the main brake of the drawworks ... requirement for TDS installation.Parameter. Rig ModelZJ50DZJ70DNominal drilling depth, 127mm(5)DP,m50007000Max. hook ... × capacity3×1500KVA4×1900KVA drilling rig,DC drilling Rigs,drilling machinery.... DC drilling Rigs