Reverse circulation (RC) drill pipe is a dual wall pipe used for uncontaminated, representative and continuous samples. It is also used to reduce air requirements and maintain uphole velocity in larger diameter drilling applications. RC Inlet air passes between the inner tube and outer barrel. Cuttings are evacuated through the center tube.
Foremost manufactures a complete range of reverse circulation drill pipe and accessories including air swivels, saver subs, bit subs, interchanges, wear sleeves, blow-down and blow-back subs and open center bits.
Foremost’s patented inner barrel suspension and retention system eliminates problems arising from the transfer of vibration and torque loads applied to the outer pipe. The inner pipe is suspended within the outer barrel and is relatively unstressed. The o-ring retainers absorb percussion forces and allow for replacement of the inner barrel in the field if required.