DTH (Down The Hole) Drill Rod

DTH Series

DTH is short for "down-the-hole". The down-the-hole drilling is used to produce large-diameter holes in rocks, usually in the initial stage prior to blasting, but it is also used in non-blasting applications. DTH drilling are used mostly in mining quarries but can be used in a variety of other construction applications. The DTH drilling method is growing in popularity, with increases in all application segments, including blast-hole, water well, foundation, oil & gas, cooling systems and drilling for heat exchange pumps. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards.

DTH Drill Rods

DTH drill rods are used for connecting DTH hammer and DTH button bits; they are made from seamless tubes. Tubes play a significant role in all DTH drilling, regardless of application, rock type, hole depth or drill rig. The key features of a high quality DTH tube are durability, accuracy and manageability. According to different application, different diameters of drill tubes are needed, basically, smaller DTH hammers need smaller DTH drill tubes, vice versa. Usually we are offering 76mm, 89mm, 102, 114mm, etc. Our all DTH drill tubes are friction welded, and usually the threads are standard API connections, like 2 3/8" API REG thread, 3 1/2" API REG thread or API IF thread, etc. According to customers request, from 1000mm to 5000mm length of tubes are available.

DTH Bit Face Designs

Flat Face Bit: Flat Face (F) design for medium hard to hard formations, good flushing and good penetration rates.

Convex Bit: Convex (V) design with double gauge row for medium to hard and abrasive formations, good flushing and good penetration rates.

Concave Bit: The all-purpose Concave (C), for soft to medium hard formations, straight holes, excellent flushing and fast penetration rates.

Concave/Convex Bit:Concave/Convex Bit(X) the best of both worlds with double gauge row and concave center for medium to hard and abrasive formations, straight holes, excellent flushing and excellent penetration rates.

Cyclops Bit: Cyclops unique single port design maximizes bit strength and minimizes the risk of bit head splitting or chunking caused by operational and manufacturing induced fatigue stress.

Features

In the hole range 100-254 mm (4"-10"), DTH drilling is the dominant drilling method today (especially when the hole depth is greater than 20 meters). The main features of DTH drilling in this hole range are:
• Excellent hole straightness within 1.5% deviation without guiding equipment.
• Good hole cleaning with plenty of air for the hole cleaning from the hammer.
• Good hole quality with smooth and even hole walls for easy charging of explosives.
• Deep hole drilling capacity with constant penetration and no energy losses in joints.
• Efficient energy transmission.
• The disturbance to the ground is kept minimum, and for drilling rock, the penetration rate is outstandingly high. 
• More cost-effective than the conventional rotary drilling.

Specification

DTH hammer is one advanced drilling tool in the world, due to its economy and powerful drilling capacity, more and more people in the world are using DTH drilling products. We have both low pressure and high pressure hammers, usually high pressure hammers are the most popular, from 3 inch to 8 inches hammers, while according to customers preference.

Related Products

The Hammer series uses a uniquely engineered air cycle to improve hammer performance and durability, even with water injection. The valve-less design features specially configured porting to allow efficient water injection through the hammer cycle. That means a more durable hammer that drills fast wet or dry.

Note: If you have any questions, please feel free to contact us.