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DTH drilling tools extend their reach

DTH drilling tools extend their reach

In 2002, Atlas Copco launched the Secoroc COP 64 Gold, its most productive 6in DTH hammer ever. The company followed that up in 2004 with the Secoroc COP 54 Gold, for those who wanted the same performance in a smaller tool. Now, Atlas Copco says the family is complete with the launch of its latest model – the Secoroc COP 44 Gold.

With the advent of this new DTH hammer, the Swedish company can offer blastholes from 110mm up to 130mm in diameter. In addition, modern highpressure rigs can get the full benefits of drilling with Secoroc COP 44 Gold thanks its 35bar rating.

The Secoroc COP 44 Gold has many features in common with the rest of the range: the specially designed piston for efficient energy transfer; the control tube suspension with new steel disc compression rings and new lower buffer rings; and steel hammer casing, providing greater impact strength and wear resistance.

The Hyper301S is the largest in Bulroc’s range of DTH hammers and capable of drilling from 863mm (34in) to 1,090mm (43in) using flat-face button bits with XL24 type shanks. The single full-face button bit uses less air and provides more efficient energy transfer than cluster-hammer arrangements, leading to faster and more accurate drilling. The single, large-diameter hammer is connected to conventional-style, hexagon-drive drill pipes sleeved to the required diameter to provide efficient flushing throughout the length of the hole. Bulroc can also offer a ring-bit system to suit this hammer when ground conditions require the hole to be continuously cased.

Bulroc UK is the only British-owned company making DTH drilling equipment in the UK and has been engaged in this business for almost 40 years.

Large-diameter DTH drilling equipment also has an important application in the field of horizontal drilling for installing pipes, and other services, under highways and railways with minimum disturbance, and minimal cost compared to other methods.

For smaller-diameter, horizontal drilling, Bulroc produces a steerable range of equipment with a unique location system that eliminates the need for sonds and sophisticated sond housings. Generally, the Bulroc Steermole operates in a dry and clean environment with no need for mud or high-pressure water systems.


Numa offers one of the largest ranges of hammers and bits, with a capability of drilling holes of 3½-43in (89-1,092mm) in diameter: the Patriot, Champion and Challenger models. Over the past 12 years Numa has introduced more than 50 new hammer models, two overburden systems and Numa Lube, an environmentally-friendly alternative to rock drill oil. Today, over 45% of its sales are overseas, with Numa hammers and bits at work on land and marine-drilling sites in over 60 countries.

Numa has engineered a new reverse-circulation bit design that improves hole cleaning and overall drilling speed. By deepening the channel ways and side exhausting, the new design can flush more air over the bit face efficiently, resulting in greater recovery and an accurate downhole sample at the surface.

Numa’s reverse-circulation hammer and bit line can drill holes of 4¾-36in (121-914mm) in diameter, with more designs planned. Numa’s reversecirculation hammers use an orifice ‘O’ ring as a choke. Removal of this ring allows additional air to pass through the hammer for hole cleaning and flushing.

The Super Jaws under-reaming bit has a design with wings that extend out wider than the casing while in the drilling position. The extended wings provide a large bit-face striking area for transferring blow energy to the formation, yielding faster penetration rates. When drilling is complete, the bit is pulled off the bottom, and the wings extract back into the bit to allow the hammer and bit to be pulled back up through the casing to the surface – no parts are left down the hole. It is available for drilling hole sizes of 150-1,245mm in diameter.


Robit Rocktools, established 1985, is expanding its production facilities with a factory extension. The Scandinavian manufacturer of high-quality rock and ground-drilling tools for construction, mining and quarrying, exports its products worldwide to more than 30 countries, and 90% of its turnover is exported. Robit is also running a project to upgrade its current quality system to meet the ISO9001:2008 standard, scheduled to be certified in June 2010.


Rockmore International, a leading manufacturer of percussive rock-drilling tools, has announced the construction of a new manufacturing centre in Austria. “Despite the current economic climate, we felt this expansion in our production capability was vital,” said executive vice-president Pejman Eghdami.

“This new facility demonstrates our commitment “This new facility demonstrates our commitment to better and faster service for our customers. It makes it possible for us to streamline the manufacturing process and expand our product line.”

Situated on a 21,000m2 site in a new industrial park zone in Judenburg, Austria, the new plant will be 7,500m2. “This new European facility will be centrally located with easy access to European markets, as well as emerging markets in the Middle East and Asia,” adds Mr Eghdami.

The new manufacturing centre will double Rockmore’s production capacity, and feature advanced heat-treatment equipment, automated CNC production machinery, and a laboratory and testing facility. The building has been designed with optimum manufacturing sequences in mind, so that production will be streamlined and efficient. Each production line begins at the delivery and prematerial warehouse, proceeds through its production sequence, and ends at the dispatch warehouse, ready for shipment.

With an eye to the environment, the new plant conforms to European energy codes and incorporates energy-saving systems. A closed-loop water-recovery system uses heated water, generated by production machinery to provide the heating and cooling function for the entire factory and offices.

The US$12 million building is expected to be ready for occupancy by July. All production equipment from Rockmore’s existing facility in Austria will be phased into the new centre. Rockmore has also enhanced its online presence with the launch of a new website featuring 3D animation of its latest rock bit lines, including the DTH drilling hammer, its new MultiPoint carbide insert design, the XR32 thread design and SonicFlow.

According to Rockmore, rock-drilling trials showed that button bits with MultiPoint inserts last up to 20% longer than the standard hemispherical design, and increase penetration rates by 10%. Wear flats appeared slower and later in the insert life than with hemispherical inserts. Testing also revealed that the MultiPoint inserts provided smoother bit rotation and advancement. The MultiPoint design is currently available in ½-¾in (12-19mm)-diameter carbide inserts, and in Rockmore’s DTH and top-hammer bits of 3.5-10in (89-254mm) diameter.

Sandvik’s RH350, RH450 and RH550 families of DTH hammers are offered in sizes of 5-18in, 3½-12in and 3-8in respectively, with the RH350 series obtainable in sizes up to 32in, to order. The hammers are led by an aggressive range of drill bits with grade XT48 cemented-carbide buttons and optimal face designs.

According to Sandvik the RH350 series are simple, lean, dependable, low-cost hammers that can use drill bits with various open-standard shank designs, suitable for applications where high penetration rates are easier to obtain, such as limestone, or where variable rock boosts the risk of hammer loss.

The RH450 series, also designed for open-standard drill bits, is of a robust, higher-performance construction that gives very high penetration rates in harder rocks, and is ideal for most applications.

Top of the range is the patented Sandvik RH550 series, which give the highest performance of all, achieved through a proprietary interface between the piston, drill bit and driver chuck, intended for drilling hard and abrasive rock.

Wassara held a drilling demonstration in Norway at the end of last year in Åmot, Telemark, with its new Norwegian OEM/distributor partner, Qmatec Drilling, attended by 60-70 drillers and contractors. Wassara’s water-powered W120 5in hammer drills hole with diameters of 130-152mm, and is commonly used in construction and geothermal applications.

One advantage is its ability to drill straight, clean holes. This is possible due to the high operating frequency of the hammer, and low up-hole velocity of the return water, allowing closer tolerances between bit and hammer. Also, with low velocity returns there is much less wear on the hammer casing, allowing guide ribs to be fitted on the standard hammer.

The system includes a high-pressure pump, hammers, bits and drill tubes connected to an existing rig. A sedimentation plant processes returns before discharge, so they do not contain any residues that might pollute the environment.
Courtesy Geo Drilling International
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