Thompson, CT USA

Numa has recently announced they have expanded the drilling range of their Impact Ring Bit System® product line to drill and case holes from 5-1/4″ to 48″ (133 – 1219 mm) in diameter.

Numa’s Impact Ring Bit System® is a technically advanced, efficient drilling product that has revolutionized the way casing is being installed in either horizontal or vertical rock drilling applications. The system consists of a down hole hammer, and a unique two-piece bit design incorporating a center and ring bit combination. In horizontal applications, an auger is also fitted onto the backend of the hammer to promote more efficient cleaning of the hole during drilling. The system’s center bit is connected directly to a DTH hammer and the ring bit is attached directly to the casing being installed. To begin drilling, the hammer and center bit are inserted through the casing to align with the ring bit. The two bits work in unison to install casing while drilling.

The benefit of the two-piece design is realized at the completion of each hole. Once the casing has been drilled down to the required depth, the center bit and drill string can be pulled back out of the hole leaving the casing installed. The ring bit is also fully recoverable in horizontal applications that utilize pit-to-pit drilling techniques. Virtually all components of the Impact Ring Bit System® are recoverable which reduces overall equipment costs because the product can be used again and again on multiple projects.

Two features of the Impact Ring Bit System® are the ability to drill quickly and accurately. Penetration rates in granite have yielded speeds in excess of 4 inches/minutes (102 mm/min) while accurately drilling on-line and on-grade. The thickness of the ring bit also helps to promote longer and deeper bores. All of this together combines to provide the drilling industry with the fastest means available on the market today for setting casing in difficult ground conditions.

Impact Ring Bit Systems® are available for many different styles of casing including steel, P.E., or concrete/clay pipes and casing. The system is perfectly suited for vertical and horizontal applications such as piles, pipelines, sewer / water rehabilitation, tie backs, tunneling under roads and buildings or any other casing installation project.

Numa is a major manufacturer of down hole hammers and bits for the international drilling industry. The company designs and builds down hole hammers and bits for drilling vertical and horizontal holes 3-1/2 to 48 inches (89 – 1219 mm) in diameter.