Full marks for Pit Viper 311

Ngày 15 tháng 1 năm 2015

Atlas Copco’s new Pit Viper 311 has successfully completed rigorous field testing at a copper mine in the USA, confirming the value of the rotary drill rig key design features.

The latest member of Atlas Copco’s blasthole PV-310 rotary drill rig range – the Pit Viper 311 – has recently completed a six month field test at a copper mine in the southwestern region of the United States. The result: full marks on all counts. The prototype PV-311 went into service at the mine with the focus on cooperation between mine personnel and Atlas Copco engineers to test modifications that would help increase productivity and efficiency.

“ The PV-311 had no trouble managing rough conditions while consistently hitting its targeted depth and maximizing the quality of the hole drilled ”

Maureen Bohac , Product Manager, Large Blasthole Drills, at Atlas Copco

The PV-311 drilled 255 mm (10 5/8 in) and 317 mm (12¼ in) diameter holes – the largest hole this rig can drill – on benches 15 m high. The 255 mm holes were drilled to a depth of 17 m with 2 m of subdrill, while the 317 mm holes were drilled to a depth of 20 m with 3 m of subdrill.

Five different drill patterns were used depending on the location of the test in the pit. The rig typically completed 35 to 40 holes amounting to 365 meters drilled in a 12 hour shift. The average availability was 90–95%. The rock encountered in the mine is typical of most copper applications, not homogeneous and with a compressive strength around 250–300 Mpa.

Atlas Copco Secoroc Tricone/DTH bits were used with each bit lasting 2.5–3 days. The prototype rig was subsequently purchased by the mine.

“ One of the contributing factors was that the PV-311 is designed so that the bits are changed above the rig’s deck, even while single-pass drilling a 20 meter deep hole. ”

Maureen Bohac

This enabled the operators to focus on making and breaking the pipe connections each time.

The PV-311 during field testing at a U.S. copper mine. Several design features in combination enabled the rig to drill 20 m holes with excellent hole quality and more.

The PV-311 during field testing at a U.S. copper mine. Several design features in combination enabled the rig to drill 20 m holes with excellent hole quality and more.

“ In addition, this prototype included our optional hydraulic clutch, which is designed to reduce fuel consumption during non-drilling operations and this had a big impact. Another factor that influenced fuel efficiency was the autodrill functionality of the rig’s RCS rig control system. ”

Maureen Bohac

Fuel efficiency was approximately 20 per cent better than other rigs on the site. On top of this, the PV-311’s quiet and comfortable cab proved to be especially appreciated by the operators

“ Fuel efficiency was approximately 20 per cent better than other rigs on the site. On top of this, the PV-311’s quiet and comfortable cab proved to be especially appreciated by the operators ”

Maureen Bohac

The PV-311 is now production drilling at mines on three continents in applications including copper, coal and iron.