drilling rig,DC drilling Rigs,drilling machinery Model:ZJ50D, ZJ70D Nominal drilling depth, m:5000,7000. ... eddy current brake with air cooling or water cooling. The drawworks may eq uip ... EATON pneumatic disk brake with water cooling as requested by customer too. 4 ... requirement for TDS installation....... Parameter. Rig ModelZJ50DZJ70DNominal drilling depth, 127mm(5)DP,m50007000Max. hook load ...