Permon VKP 95-1 User manual

Down the Hole Hammer
VKP 95-1
O
P
E
R
A
T
I
O
N
M
A
N
U
A
L

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 2
Contents
Preface........................................................................................................................3
Principles of Operation................................................................................................3
Specifications..............................................................................................................3
Parts List.....................................................................................................................4
Safety Precautions......................................................................................................4
Preparation for Drilling and Drilling..............................................................................5
Lubrication...................................................................................................................6
Weight on Bit...............................................................................................................7
Rotation Speed ...........................................................................................................7
Suggested Operating Procedures...............................................................................7
Disassembly................................................................................................................8
Assembly.....................................................................................................................9
Storage........................................................................................................................9

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 3
Preface
This operation and maintenance manual provides the drawings, parts lists and
suggested procedures necessary for the operations, care and maintenance of the
VKP 95-1. It is extremely important that all the suggested safety precautions, as well
as user’s safety rules, be followed. PERMON is not responsible for damage to
equipment or personnel injury due to misuse of the equipment or disregard for safety
procedures.
Principles of Operation
The VKP series of downhole hammer drills are designed for efficient operation with
minimum air requirements in a wide range of air pressures. These hammers are
recommended for blasthole drilling in quarries and open pit mines as well as water
well and construction drilling applications. The downhole drilling method has proven
to be economically effective in a wide range of rock types ranging from
unconsolidated limestones to the hardest granite and quartz formations. Since the
hammer force is applied directly to the drill bit, power transmission losses as are
common in conventional top hole hammers are prevented.
These hammers can be used on any rig having an adequate rotational mechanism
and an appropriate compressed air supply.
Specifications
Hammer
Type Connection Thread Shipping Weight Outside Diameter Length without Bit Bit Size Range
kg lbs. mm in. mm in. mm in.
VKP 95-1 API 2 3/8”
Reg. Box 22,5 49.5 81,0 3.19 790 31.10 92-105
3 5/8-4 1/8
Air Consumption
6 Bar 9 Bar 12 Bar 15 Bar 18 Bar 21 Bar 24 Bar
90 PSI 130 PSI 175 PSI 220 PSI 260 PSI 305 PSI 350 PSI
3,3 m
3
/min 5,2 m
3
/min 7,1 m
3
/min 9,2 m
3
/min 11,6 m
3
/min 13,7 m
3
/min 16,2 m
3
/min
117 SCFM 184 SCFM 251 SCFM 325 SCFM 410 SCFM 484 SCFM 572 SCFM
Impact Rate
6 Bar 9 Bar 12 Bar 15 Bar 18 Bar 21 Bar 24 Bar
90 PSI 130 PSI 175 PSI 220 PSI 260 PSI 305 PSI 350 PSI
1490/min 1830/min 2100/min 2320/min 2530/min 2620/min 2710/min

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 4
Parts List
REF. PART NO. PART NAME
9550210 HAMMER COMPLETE
1 2148180 CHUCK VKP 95-1
1 2148200 CHUCK IR3,5 (OPTIONAL)
2 273109 O-RING 55X2
3 2361120 SPLIT RING VKP 95-1
3 2361510 SPLIT RING IR3,5 (OPTIONAL)
4 4342580 CYLINDER
5 5009200 PISTON COMPL.
6 722090 PISTON VALVE
7 5100060 BACKHEAD ASSEMBLY
8 273068 O-RING 55X3
9 2023350 PLUG
10 4325190 VALVE PIPE
11 4501380 SPRING
12 8140010 VALVE
13 273408 CHECK VALVE SEAT
- 414279 PLUG API 2 3/8"

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 5
Safety Precautions
The following safety precautions apply to all drilling equipment supplied by PERMON
s.r.o. including the VKP 95-1 and the bits discussed in this manual.
Personnel must become completely familiar with the proper procedures and safety
precautions before operating and maintaining the hammers and bits.
Failure to comply with safety precautions can result in serious or fatal injury to
personnel, and improper operation and maintenance can cause equipment damage
or excessive wear on the hammer and bit.
•Wear proper clothing. A hard hat, work gloves, safety shoes, eye and ear
protection are required. Don’t wear loose clothing that can get caught in the
equipment.
•Wear goggles. Safety glasses are required. Loose chips, rock and dust are blown
into the air during drilling. Also, wear safety glasses when resharpening bits.
•Protect lungs. Wear a respirator to keep from breathing or ingesting dust,
especially if drilling without water or foam injection.
•Do not drop the hammer or bit. This equipment is very heavy. Handle it with care.
In addition, auxiliary lifting equipment is suggested.
•Know the drilling formation. Exhaust air and hydrocarbons can form an explosive
mixture under certain drilling conditions. If the drilling formation is known, proper
precautions can be taken to avoid potential danger.
•Respect the equipment. Do not operate the hammer at excessive pressures or
speeds. Follow the instructions in this manual and use the suggested procedures
for operation and maintenance.
•The bit can drop out of the chuck by as much as 1“ (25 mm). Caution is
recommended when handling the hammer in order to prevent body parts, such as
hands and fingers, from being pinched between the chuck and bit.
Preparation for Drilling and Drilling
Each hammer is assembled and tested before shipment. The hammer is shipped
with all joints hand-tight.
It is suggested that all personnel operating, handling or maintaining the hammer
become completely familiar with the hammer and bits, and the instructions in this
manual.
When handling the hammer and drill pipe, always keep the inside pipe and threads
covered to prevent dirt, rust, scale or other objects from entering the hammer or the
drill pipe.
Always use the proper wrenches, tools and procedures when handling the hammer
or changing the bit.
All thread connections must be coated with thread compound (copper, metallic zinc
or graphite) before the hammer is assembled and operated. Do not allow thread
compound, dirt or wire brush to fall into hammer.
Important: Do not use bent joints of pipe. This cause uneven hammer wear and
premature bit failures. If the joint does not shoulder easily, check the threads.

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 6
Lubricate the bit splines. Place chuck over bit followed by O-ring and split ring. Check
that both parts of the split ring are positioned number to number and that the serial
numbers are the same.
Screw the chuck/bit assembly into the cylinder hand-tight before using power make-
up.
Tighten the hammer securely to the drill pipe by applying a wrench to the flats of the
hammer’s backhead and rotate slowly using the rig’s rotational action.
Insure the lubricator is working properly and has fully coated the drill pipe ID.
Lower the hammer slowly until the bit contacts the rock and the piston starts
operating.
Important: Wear gloves at all times when guiding the hammer into the hole to
protect hands. Follow all safety precautions.
When drilling a new hole, add just enough hold-down pressure to start breaking rock.
When drilling through loose surface material, avoid running the hammer at high air
pressures as this will tend to blow the hole apart.
After a few feet of drilling, increase the total weight on the bit until the hammer runs
smoothly. The air pressure will rise slowly, then stabilise.
Caution: Always apply the air and start rotation before putting weight on the bit to
avoid damaging the bit.
Additional weight on the bit will not appreciably increase the penetration rate, but will
lead to greater carbide and hammer wear.
Lubrication
Correct lubrication during drilling operations is extremely important. Inadequate
lubrication is a major cause of hammer wear and failure. Use rock drill oil only.
When new VKP 95-1 DTH hammer or drill pipe are put into use, it is recommended
that 1/4 a quart (0.25 ltrs) of oil be pured into the new hammer or each pipe to give
them a good coating of oil and to prevent the hammer from running dry at any time.
The recommended amount of rock drill oil for reliable operation 0.08 quarts per hour
per 100 CFM (0,15 litres per hour per m
3
/min).
Check oil levels each shift. Monitor oil delivery to hammer by looking at oil dripping
from bit after each hole is drilled.
Hammer will not be damaged by too much oil. It can be damaged by not enough oil.

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 7
Recommended environmentally friendly rock drill oils for lubrication:
SETUZA PRIMOL EKO
ÖMV BIOHYD M 32
TOTAL HYDROBIO 46
BP BIOHYD SE46
Weight on Bit
For efficient drilling it is important that the bit carbides are in contact with the rock at
the time of impact. The weight on bit must be sufficient to overcome the vibration of
the hammer and hold the bit against the rock. Figure 1 shows the required weight on
bits.
Important: The weight on bit must be maintained throughout the drilling operation.
As the hole gets deeper and drill pipe is added, the hold-down pressure must be
reduced to compensate the added weight of the pipe.
Figure 1. Minimum Total Weight on Bit
6 Bar 9 Bar 12 Bar 15 Bar 18 Bar 21 Bar 24 Bar
90 PSI 130 PSI 175 PSI 220 PSI 260 PSI 305 PSI 350 PSI
170 kg 250 kg 330 kg 410 kg 490 kg 570 kg 650 kg
374 Lb. 550 Lb. 726 Lb. 902 Lb. 1078 Lb. 1254 Lb. 1430 Lb.
Rotation Speed
Proper rotation speed is important for long bit life and good penetration. The
recommended speed ranges from 10 to 70 RPM, with the slower rotation used in
hard, abrasive formations and the faster rotation in soft, non-abrasive formations.
Do not use high rotary speed. Using too high of a rotary speed leads to scuffing or
breakage of the carbide inserts on the drill bit. Adjust the rotation to obtain the best
drilling rate and to minimise the wear on the bit.
Suggested Operating Procedures
Maintain good hold-down pressure on the hammer and insure that the hole is being
cleaned.
In certain formations, the hammer will hit a soft band of material and drill quickly.
Often, the drill’s feed system is not able to cope with a sudden change because it
allows the oscillating piston to strike the bit when it is not in contact with the rock.
This magnifies stress to the bit. To avoid damaging the bit, drop the operating
pressure and let the hammer tap its way through the soft material.
If there is a drop-off in the size and volume of cuttings or an air pressure build-up
while the hammer is operating at a normal rate, raise the hammer without turning off
the rotation and work the hammer up and down to assure that the hammer and pipe
are free and the hole is clean before continuing to drill.
Cracks in the formation may cause the hammer to bind in the hole. Raise the
hammer, clear the hole with air and work the hammer up and down to assure that the
hammer and pipe are free before continuing to drill. Rotate slowly and feed the
hammer down the hole slowly to resume drilling.

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 8
If the top of the hole craters, and cuttings and debris fall into the hole from the
surface, install a short length of casing in the hole. Allow the casing to extend 6 to 8
inches (15 to 20 cm) above the surface and pack rags, clay or dirt around the outside
of the casing.
When the rotation stops, the hammer will continue to hammer unless the hammer is
raised off the bottom. If the hammer is not raised off the bottom, the bit carbides will
become buried in the formation. Severe damage to the bit can occur if rotation is
resumed without first raising the hammer and bit.
Very rough rotation can be caused by a dull bit or certain rock formations.
When drilling deep holes, thoroughly flush the hole at the end of the drill pipe before
adding another joint. Lift the hammer for about 4"-6" (10-15 cm) and apply full air
pressure. If the hammer strikes continue pulling back out of the hole. Failure to flush
the pipe can allow cuttings to fall back to the bottom of the hole and sometimes into
the hammer.
Keep the drill bit carbides always sharp to keep the maximum penetration rate, avoid
bit breakage and reduce hammer overload.
Important: Do not reverse rotate the drill pipe due to the danger of unscrewing either
the drill bit or pipe connections.
Disassembly
Caution: Never apply heat of any type or weld breakout tabs on any part of the
hammer. Never strike or impact the cylinder or thread connections or damage could
occur. Always use tongs with jaws that place a uniform load on the outside diameter
of the hammer. Never grip with pipe wrenches that can deform and damage the
hammer
Clamp the hammer in tongs with cylindrical jaws (refer Figure 2 for correct placement
of cylindrical tongs or clamps). Placement of tongs on any other area of the cylinder
except where indicated can cause severe damage to the cylinder. Make sure the
tongs are held perpendicular to the piston case when loosening the chuck or
backhead, otherwise the tongs can dig into, and damage the piston case. Place the
bit breaker on the bit and unscrew the chuck with the bit and using wrench 65 mm
the backhead assembly.
Figure 2. Dimensions for Tong placement
A 185 mm / 7.3 inch B 315 mm / 12.4 inch
Remove the piston from the top of the cylinder. Be careful, do not damage the plastic
piston valve.

PERMON s.r.o. VKP 95-1 – OPERATION MANUAL PAGE 9
Disassemble the backhead assembly. Remove the rubber check valve seat, check
valve and spring.
Assembly
Important: Before assembling the hammer, insure all components are inspected and
restored to the best possible condition or replaced, if needed.
Insure all components are thoroughly cleaned to remove any residual emery dust,
steel flings or corrosion. Thread lubricant MUST be used on all threaded connections
and bit shank and splines. Coat all new or reworked components with rock drill oil.
When the hammer is put back into service, this coating protects parts, until the line
oil starts injecting the proper amount of oil into the air stream. All threaded joints
must be properly tightened before returning the hammer into service. With the
hammer assembled and immediately before returning to service, pour - for some
rock drill oil into the hammer. Fill the level of the backhead, then release the check
valve allowing the oil to flood the hammer.
Storage
Disassemble the hammer completely.
Thoroughly clean and repair all components.
Reassemble the hammer immediately, keeping the joints loose.
Coat the entire hammer, OD and ID, with a light film of rock drill oil. Coat all threads
with thread lubricant.
Install thread protectors.
Seal each end of the hammer to keep dirt and dust out of the hammer.
Always store the hammer in a suitable protective container in a dry location.
Grease the bit shank.
Place a protective cover on top of the bit to prevent foot valve breakage.
Always store the bit in a suitable protective container in a dry location.
PERMON s.r.o.
Roztoky 217
27023 Krivoklat
Czech Republic
Tel.: [phone]
Fax: [phone]
Email: [e-mail]
www.permon.cz