Product Application

Reverse Circulation Drilling

For Holes 5¼” to 38” (133 to 965 mm)

Leading the Industry for Reverse Circulation Systems

Numa has led the industry in the innovative design of Reverse Circulation (RC) hammers and bits for exploration, dewatering, caissons, piles/rock sockets, and foundation drilling where large volume of rock excavation is required.

Reverse Circulation Drilling

Patriot RC50

5 ½” – 5 ¾”

133 to 146 mm

Challenger RC100

10″ – 15″

254 to 381 mm

Champion RC160

16″ – 20″

406 to 508 mm

Champion RC210

21″ – 28″

533 to 711 mm

Champion RC300

30″ – 36″

762 to 914 mm

Reverse Circulation Systems


Dampier Port Upgrade Project

Location: Dampier Port, Western Australia

Dock Replacement Project

Location: Hudson Bay, Canada

Gas Storage Well Project

Location: Pennsylvania, Eastern USA

LPG Jetty Pile Installation Project

Location: Burrup Peninsula, Northwestern Australia

Pier Pile Installation Project

Location: Maharastra, Southwest India

Numa is the world’s leading drilling technology provider, with the highest value in products, performance and service in the entire drilling industry.

Our RC products exhaust all cuttings up the center of the hammer and drill string to be safely collected at the surface, which reduces the risk of hole erosion and is better suited for environmentally sensitive applications.

The deep channel ways and side exhaust holes on our RC bits flush more air over the bit face resulting in a greater recovery and accurate down hole sample at the surface – all at a much faster drilling rate.

Numa’s Reverse Circulation System is a DTH hammer for use in environmentally challenging or confined work sites where contamination or risks of damaging close-by piles or other infrastructure. It uses a modified RC concept where water and/or bezonite are used for flushing the hole instead of pressurized air that can impact the surrounding area.

RC Products to meet your needs:

Benefits of Numa’s Reverse Circulation offerings include:

  • Five valveless hammer models. 
  • Cuttings exhaust up a collection tube in the center of the hammer and drill string to be safely collected at the surface.
  • Environmentally sensitive – no foam required for hole cleaning and lubricants are not free to contaminate the formation.
  • Exceptional performance against high heads of water.
  • Hole erosion dramatically reduced.
  • Faster and more efficient than rotary drilling.
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