... mud pump 4,wide range of application Range of application (1)Geological exploration; engineering geology investigation and kinds of survey hole ... 75mm 0r 46mm. The drilling depth can? not exceed its 110%.1.Drilling capacity Drilling depth100,180 m Initial hole dia. max ... speed121,76,36 r/min Drum circumferential velocity (two layers)1.05, 0, 66, 0, 31 m/s Drum dia140 mm ...