"Dual rod drilling rigs are much easier to use than other rock drilling solutions and provide more versatility when a contractor is drilling soil conditions that vary significantly throughout the bore
Vermeer’s new D40x55DR S3 Navigator horizontal directional drill features the company’s dual rod technology, which uses an inner rod to provide torque to the drill bit, while the outer rod offers steering capability and rotation torque for reaming. This combination provides powerful downhole cutting action and the flexibility to select the appropriate tooling to best match the ground conditions.
"Dual rod drilling rigs are much easier to use than other rock drilling solutions and provide more versatility when a contractor is drilling soil conditions that vary significantly throughout the bore