The problem of Thread broken has been introduced in Down The Hole Drilling Trouble Shooting – Treaded,  and in article we will try to explain what caused hammer piston casing breakage and how to fix it.

Piston Casing – Case 1

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  •  Problem
    • Longitudinal crack on piston casing
  • Probable cause
    • Loose joint
    • Insufficient make-up torque
    • Another sign of this problem is excessive wear on the make up side of the threads
  • Corrective action
    • Make sure correct make-up torque is applied

Piston Casing – Case 2

 

 

 

 

  •  Problem
    • Longitudinal crack on piston casing
  • Probable cause
    • Not chosen the piston casing indicate that wrong type of tools have been used when opening the hammer
  • Corrective action
    • Use correct tools (chain or petrol type tongs) when loosening the thread connections and apply tools in correct positions

 

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