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Secoroc QLX 50/55 Down the Hole Hammer

QLX 50/55 - The Latest in High Performance DTH Hammers

Secoroc QLX 50/55 hammerAt Atlas Copco Secoroc, we keep looking for new ways of improving our customers' productivity. That’s why we have taken the best of the QL design, thrown in a few new ideas, and created the Secoroc QLX 50 and QLX 55 down the hole hammers.

QLX 50 and QLX 55 are primarily deep hole hammers, but have also proven to be high performance hammers for other applications.

These new 5" hammers offer 20% more all-around performance than the QL hammers and better water-logged deep hole drilling capacity than its predecessor, the TD 50 hammer. They are benchmarks with the highest rate of penetration (ROP) and reliability that are a cut above the rest, thanks to solutions such as the new e-kit making servicing easier and quicker to execute. The QLX 55 has thicker heavy duty (HD) casing for longer service life when drilling in abrasive rock formations.

The QLX 50 and QLX 55 have been stringently field tested in the USA and Sweden prior to launch. They have proven outstanding in water well, geothermal drilling, and other applications thanks to the Air Select feature that enables the QLX to match a variety of air packages while utilizing the excess air for hammer power.

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QLX 50/55 cutaway

QLX 50/55 DTH Hammer Specifications
  1. Field-proven check system.
  2. Robust detent system.
  3. Proven Quantum Leap air cycle provides "power" for 80% of piston down stroke.
  4. Air Select system allows selectable timing to maximize hammer performance to match air package.
  5. Reversible casing to maximize wear.
  6. Industry leading QL style shank.

General Specifications
QLX 50
QLX 55
 
Air Consumption and Impact Frequency (with Air select on default setting 2)
Connection thread
3 1/2" API Reg Pin
Air Pressure
scfm
bpm**
Bit shank
QL 50
100 psi
155
1305
Outside diameter
4.8"
5.08"
150 psi
257
1426
Length w/o bit shoulder to shoulder
41.76"
41.76"
200 psi
374
1547
Weight w/o bit
153.0 lbs.
178.0 lbs.
250 psi
508
1668
Backhead across flats
3.7" / 4"
3.7" / 4"
300 psi
657
1788
Recommended minimum bit size
5.25"
5.5"
350 psi
822
1909
Recommended maximum bit size
6"
6"
400 psi*
961
2029
Bore
3.95"
3.95"
450 psi*
1109
2114
Piston weight
33.0 lbs.
33.0 lbs.
500 psi*
1258
2270
Stroke
3.75"
3.75"
  *Estimated value
**Blows per minute
Maximum pressure differential
500 psig
500 psig
Make-up torque
5000 ft-lb.
5000 ft-lb.

Operational Specifications
Feed Force
1500 - 2000 lbs.
Rotation Speed
50 - 80 rpm


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Secoroc QLX 50/55 Down the Hole Hammer

QLX 50/55 Down the Hole Hammer part breakdown

Ref.
Part
 
Ref.
Part
1
Exhaust tube
13
O-ring*
2
Chuck for QLX 50 / for QLX 55
14
Compression cone
3
Bit retaining ring assembly
15
Air distributor
4
O-ring* (bit retainer)
16
Plug, guide flow select
5
O-ring* (bit bearing)
17
Detent assembly
6
Bit bearing
17a
Plunger*
7
Lock ring
17b
Plunger spring*
8
Casing for QLX 50 / for QLX 55
17c
Plunger retainer plug*
9
Piston
18
Check valve spring
10
Seal - piston tail bore
19
Check valve
11
Inner cylinder
20
O-ring* (check valve)
12
Valve assembly
21
Choke plug solid
12a
O-ring*
22
O-ring*
12b
O-ring*
23
Backhead assembly for QLX 50 / for QLX 55
  *Not sold separately
**Item 21 - Choke plug 1/4" and choke plug 1/8" may be used to bypass more air to reduce pressure and/or
     increase bailing velocity.


Wear Limits
 
Hammers and Kits
Chuck
Min. length
1.85"
  • QLX 50 Complete, 3 1/2" API Reg Pin
  • QLX 55 Complete, 3 1/2" API Reg Pin

  • E-kit QLX 50, 3 1/2" API Reg Pin
  • E-kit QLX 55, 3 1/2" API Reg Pin

  • O-ring kit includes items 2x4, 1x5, 1x22

  • Sustainability kit includes O-ring kit and items 10, 12, 2x13, 20
Casing reverse QLX 50
Min. OD
4.65"
Casing reverse QLX 55
Min. OD
4.84"
Casing discard QLX 50/55
Min. OD
4.38"
Bit bearing
Max. ID
3.019"
Piston/Casing clearance
Max.
0.01"
Piston/Inner cylinder clearance
Max.
0.009"
Exhaust tube protrusion
Max.
2.07"