... Drilling Rigsconformity with API Spec 4F, 7K, 8C Specifications. Rig modelZJ30/1700DBZJ30/1700DBTZJ30/1700LNominal drilling depth (4 1/2" drill ... belt compound transmission.ZJ30/1700L is a mechanical drilling rig, the rig power is from diesel engine and coupling, integrated chain ... compound.ZJ30/1700LDB is a mechanical and electrical compound drilling rig, rotary table is driven by AC-motor, other is ...