Here we will give the high level introduction on how to select the DTH drilling tools, due to they are the key components for borehole drilling.

Hammers and bits

  • Generally the hammer should be selected to match the maximum operating conditions for the compressor
    • The recommendation is that the hammer shall use about 85% of the compressor air delivery capacity
  • The bit should be selected to give best possible drilling rate and service life in present rock conditions
    • Bit face and head design
    • Flushing holes
    • Button shape and carbide grade





Drill pipes

  • Drill pipes should be selected to meet high demands on:
    • Wear resistance
    • Long thread life
    • Strong and reliable tool joints
    • Easy coupling and uncoupling
    • Low weight





Hammer Type

  • There is a vast array of DTH hammers on the market
  • Apart from standard there are three other hammer types available:
    • Heavy duty
    • Deep hole
    • Reversable
  • Heavy duty (Hardrock H-line)
    • Robust and more wear resistant hammer casing for drilling in abrasive rock
  • Deep hole (Hardrock W-line)
    • For water-well drilling or oil and gas drilling Designed to maintain performance where high back pressure is encountered.

Also allows more air to pass through the hammer to boost flushing

  • Reversable (Hardrock R-line)
    • Reversable piston casing to better cope with steel wash in the forward section of the hammer

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