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Reverse Circulation DTH Hammer

 Reverse Circulation DTH Hammer

Features
1. The reverse circulation DTH hammer provides large impact energy and high energy transfer efficiency while ensuring low energy consumption.
2. It delivers high drilling efficiency due to strong rock dust and flakes removing capability.
3. Compressed air and reverse-flow fluid medium are all transported in the sealed double-wall drilling tool, thus avoiding direct contact with the borehole wall and maintaining stability of the wall. The reverse circulation hammer shows unique effect to complex and leakage formations.
4. Rock core sample will be carried by the fluid medium and directly go back to the ground through the center hole of the drilling tool. It will not touch the wall of borehole, ensuring high total core recovery percentage with no pollution.
5. Rock dust and flakes will be cleaned and discharged to a specific position through the center hole for ease of central disposal. This makes for a prevention of dust and pollution, leads to improvement of working improvement and ensures an increase of drilling equipment service life and attendance rate.
6. The reverse circulation DTH hammer comes with simple structure that accounts for its easy maintenance and fast replacement of quick wear parts.

Technical Parameters
Reverse Circulation DTH Hammer
Model SPMF335 SPMF345 SPMF355 SPMF365 SPMF385 SPMF3105 SPMF3125
(mm)/ Drilling diameter Φ90~105 Φ110~130 Φ135~155 Φ160~200 Φ200~254 Φ254~311 Φ311~381
(mm) Hammer length/(Includes DTH bits) 1143 1281 1292 1345 1578 1440 1430
(mm)/External diameter Φ85 Φ105 Φ124 Φ154 Φ190 Φ250 Φ270
(mm)/ Center hole diameter Φ33 Φ36 Φ36 Φ61 Φ61 Φ75 Φ85
(Mpa)/Working pressure 0.7~2.1 0.7~2.1 0.8~2.1 0.8~2.1 0.8~2.1 0.8~2.4 0.8~2.4
(m3/min)/Air consumption 4.2~11.7 5.7~14.2 6.5~19.3 9~18 12~30.8 15~34 20~37.8
(N·M)/Torque 475 600 791 950 1040 1260 1250
(times/min)/Impact frequency ≥800 ≥800 810~1200 600~1100 660~1208 600~1230 600~1150
Top sub (thread connection) API 2-3/8" Reg Box (female thread) API 2-7/8" Reg Box (female thread) T 91-3 Reg Box (female thread) API 4-1/2" Reg Box (female thread) API 4-1/2" Reg Box (female thread) API 4-1/2" Reg Box (female thread) API 4-1/2" Reg Box (female thread)
Bit shank SPMF335-95/100 SPMF345-115/127 SPMF355-140/152 SPMF365-165/178
/195
SPMF385-203/216
/230/254
SPMF3105-254/273
/305
SPMF3125-311/355
/381
Code name: SPM + F + Model No.
Eg .: SPMF345
F= Reverse Circulation; 345=Model No. of RC hammer
※ Above technical parameters are used for reference only.