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
PRODUCTS
5 ½” – 5 ¾”
133 to 146 mm
10″ – 15″
254 to 381 mm
16″ – 20″
406 to 508 mm
21″ – 28″
533 to 711 mm
30″ – 36″
762 to 914 mm
Reverse Circulation Systems
Projects
Dam Ground Anchors
Location: Stirlingshire, Scotland
Dampier Port Upgrade Project
Location: Dampier Port, Western Australia
Dock Replacement Project
Location: Hudson Bay, Canada
Gas Storage Well Project
Location: Pennsylvania, Eastern USA
Kerttuli’s Square Cellar Piling Project – Dual Fluid System
Location: Turku, Finland
LPG Jetty Pile Installation Project
Location: Burrup Peninsula, Northwestern AustraliaNuma is the world’s leading drilling technology provider, with the highest value in products, performance and service in the entire drilling industry.
Our reverse-circulation drilling products efficiently exhaust all cuttings up the center of the hammer and drill string, allowing them to be safely collected at the surface. This process reduces the risk of hole erosion and is ideal 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 greater recovery and more accurate down-hole samples at the surface—all while achieving a significantly faster drilling rate.
Numa’s reverse-circulation drilling products include a specialized DTH hammer system designed for use in environmentally challenging or confined work sites, where contamination or the risk of damaging nearby piles or infrastructure is a concern. Our system utilizes a modified reverse-circulation (RC) concept, using water and/or bentonite for hole flushing instead of pressurized air, minimizing impact on 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.