Drilling rock is a very difficult process and during drilling some problems with hammers might be faced. In order to avoid such problem the following precautions are taken
Compressor Output is Checked for |
Temperature & altitude are adjusted |
Air pressure is checked with pressure gauge |
Air filters are checked |
Minimum Level of rock oil is maintained |
Drill Rods are Checked for |
Air leakage’s throughout |
Pressure loss in hose |
Weight on bit is checked for |
Feed cylinder dropping |
Proper rotation & feed |
Control tube is checked for |
Correct diameter and height |
Chips at internal diameter |
Burrs on outer diameter |
Check valve is checked for |
Proper seating |
Level of rig is checked for |
Level jacks leakage |
Hydraulic pressure dropping at valve end |
Problem |
Cause |
Solution |
Thread Locking |
Insufficient Lubrication |
|
Use proper amount &type of thread lubricants |
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Damaged thread |
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Thread breakage |
Improper or damaged mating parts |
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Check the mating parts with api thread gauge |
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Threads rust |
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Maintain Proper Rust Preventive Oil |
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Operated with damaged threads |
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Outer Diameter Body
Wear Out |
Abrasive formation |
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Increase hole cleaning |
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Avoid the wear out bits |
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Body cut |
Damaged threads |
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Hammer Case
Problem |
Cause |
Solution |
Thread locking |
Insufficient lubrication |
|
Use proper amount & type of thread lubricants. |
|
Thread breakage/Crack |
Improper or damaged mating
parts Denting at hammer case |
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Check the mating parts with API thread gauge |
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Open proper breakout tools |
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Do not open with heat & hit |
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Threads rust |
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Maintain proper rust prevent oil |
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Operated with damaged threads |
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Od Body Wear Out |
Abrasive formation |
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Increase hole cleaning |
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Avoid the wear out bits |
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Body Cut |
Damaged threads |
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Remove the threads burs |
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To check control tube seating face perpendicular to honing bore in hammer case |
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Crack at Front Chuck End |
Case worn below acceptable limit |
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Use new bit |
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Replace hammer case |
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Id Wear Out |
Insufficient lubrication |
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Use proper amount & type of lubricants |
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To check compressor filter |
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To clean hammer case before assy |
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To check control tube id |
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To check coupler id |
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To check drill rods id |
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Cap drill rods after use |
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Foreign material contamination |
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Check Valve
Problem |
Cause |
Solution |
Not sealing |
Worn or cut seal surface
(Spring tension may less) |
|
Replace check valve |
|
Replace spring |
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Melting |
Heavy temperature |
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Check compressor out put temperature |
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Use proper amount & type of lubricants |
|
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Control Tube
Problem |
Cause |
Solution |
Od Rubbing |
Insufficient lubrication |
|
Use proper amount & type of lubricants |
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To check compressor filter |
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To clean hammer case before assy |
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To check control tube id |
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To check coupler id |
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To check drill rods id |
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Cap drill rods after use |
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Replace worn partsPin taper (digger) |
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Control tube seating in hammer case (tiger) |
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Foreign material contamination |
Work piston od hammer case
ID Misalignment |
Cracked or Broken |
Heavy friction |
|
Foreign material keep out |
|
Use proper amount & Type of lubricants |
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Maintain proper alignment |
|
Use proper amount & type of lubricants |
|
Rust |
|
Piston
Problem |
Cause |
Solution |
OD Rubbing |
Insufficient lubrication |
|
Use proper amount & type of lubricants. |
|
To check compressor filter |
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To clean hammer case before assy. |
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To check control tube idTo check coupler id |
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To check drill rods id |
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Cap drill rods after use |
|
Replace worn parts |
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Pin taper (digger) |
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Control tube seating in hammer case (tiger) |
|
Foreign material contamination |
Worn piston OD hammer case
ID Misalignment |
Cracked or Broken |
Heavy friction |
|
Foreign material keep out |
|
Use proper amount &type of lubricants |
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Maintain proper alignment |
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Use proper amount of lubricant |
|
Rust |
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