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8inch DTH Drill hammer

The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 ½”–10″). Smaller blast holes are generally drilled using top hammer, and larger holes generally use rotary machines.
In other applications, like foundation drilling, DTH hammers can be used with single bit in hole sizes up to . 750 mm (30″). With multiple hammer units CD (Cluster drills) drill holes up to 70″ or 1778 mm.

Quantity:
  • ROS-R8-Q
  • ROSCHEN
  • R8-Q

Product Description


 DTH hammer 8” 

Product description:

The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 ½”–10″). Smaller blast holes are generally drilled using top hammer, and larger holes generally use rotary machines.

In other applications, like foundation drilling, DTH hammers can be used with single bit in hole sizes up to . 750 mm (30″). With multiple hammer units CD (Cluster drills) drill holes up to 70″ or 1778 mm.

As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size. A 4 inch hammer will drill a 4 inch (102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1 inch, so for a 4 inch hammer the maximum hole size is 5 inch (127–130 mm).

Choosing the right hammer is largely determined by hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for cuttings to evacuate the hole.

Specifications

Metric

Imperial

Hammer Outside Diameter

181mm

7.15"

Hammer Length (Less Bit, Backhead Shoulder   to Chuck)

1186mm

46.7"

Backhead Spanner Flat Size

140mm

5.5”

Drill Bit Shank Type


SD86315

Minimum Bit Size

203mm

8.0"

Hammer Weight (Less Bit)

173.2Kgs

381Lbs

Drill Bit Weight (120mm/4 3/4")

48.5Kgs

107Lbs

Piston Weight

39Kgs

86Lbs

Backhead Stand Off

0.75mm

0.030”

Make up Torque

8135-10850 NM

6000-8000 FT Lbs

Wear Sleeve Reverse Limit

172mm

6.770"

Wear Sleeve Discard Limit

169mm

6.650”

Recommended Minimum Air Package

425    l/s @ 24.1 Bar

900 cfm @350 psi

The ROSCHEN 8” hammer is designed around proven technology to perform at the top end of the performance scale compared to other tools on the market. These tools are excellent for all types of drilling applications including residential geothermal, production quarry drilling, seismic drilling and small construction drilling.

dth hammer 8inch structure

DTH hammer 8inch

 Key Features and Benefits

•Patented features maximize energy output and reduce service requirements.

•Fewer internal components minimize service requirements.

•Valueless, high frequency design ensures smooth operation.

•Hardened wear sleeve for optimum wear resistance even in the most abrasive conditions.

•Multi-start threads on back head and chuck ensure easy coupling/uncoupling of hammer.

•Unique internal mount system eliminates the need for wear shims and special assembly tools.

•All critical internal components are heat treated under strict control to maximize tool longevity.


Air Consumption trend

dth hammer 8inch air consumption

Dth Hammer Drilling Tools Specifications: 

 

ROSCHEN   DTH Hammers Specifications


Hammer   Size

Bit   Shank

ROSCHEN   Code

Connection   Thread

Suitable   bit

Working   pressure

Air   consumption



2"

BR2

ROS   11

ROS   22

RD50   box

70-90mm

0.7-1.75Mpa

0.7Mpa

4.5m3/min


1.0Mpa

4m3/min


1.4Mpa

5m3/min


3"

DHD3.5

ROS   32

API   2 3/8" Reg

90-110mm

1.0-1.5Mpa

1.0Mpa

4.5m3/min


COP32/COP34


M30

1.5Mpa

9m3/min


4"

DHD340

ROS   34

API   2 3/8" Reg

110-135mm

1.0-2.5Mpa

1.0Mpa

6m3/min


COP44


QL40


SD4

1.8Mpa

10m3/min


M40

2.4Mpa

15m3/min


5"

DHD350

ROS   52

ROS   54

API   2 3/8"Reg/API 3 1/2" Reg

135-155mm

1.0-2.5Mpa

1.0Mpa

9m3/min


COP54


QL50


SD5

1.8Mpa

15m3/min


M50

2.4Mpa

23m3/min


6"

DHD360

ROS   62

ROS   64

API   3 1/2" Reg

155-190mm

1.0-2.5Mpa

1.0Mpa

10m3/min


COP64


QL60


SD6

1.8Mpa

20m3/min


M60

2.4Mpa

28.5m3/min


8"

DHD380

ROS   82

ROS   84

API   4 1/2" Reg

195-254mm

1.0-2.5Mpa

1.0Mpa

15m3/min


COP84


QL80

1.8Mpa

26m3/min


SD8

2.4Mpa

34m3/min


M80/M85


10"

SD10

ROS   100

API   6 5/8" Reg

254-311mm

1.0-2.5Mpa

1.0Mpa

22m3/min


Numa100

1.8Mpa

40m3/min


ROS   100

2.4Mpa

55m3/min


12"

DHD1120

ROS   120

API   6 5/8" Reg

305-445mm

1.0-2.5Mpa

1.0Mpa

30m3/min


SD12

1.8Mpa

56m3/min


Numa120

2.4Mpa

78m3/min


Notes:   Any special size of DTH bits will be available by requests.


Metzke,   Remet thread is available!




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