Tool Breakage Due To Corrosion; Tool Breakage Due To Defective Material - NPK PH1 Operator's Manual

TOOL BREAKAGE

TOOL BREAKAGE DUE TO CORROSION

Corrosion on the tool surface causes stress concentrations in the corroded area and a
fatigue fracture can occur. These fractures, combined with impact stress, can lead to
tool breakage.
PREVENTATIVE MEASURES
After using the tool in salt water, or exposing it to a corrosive environment, or before
long term storage, be sure to rinse with fresh water. Dry the tool and coat it with grease
to protect it from corrosion.
WARRANTY
NPK Warranty does not cover this type of failure.

TOOL BREAKAGE DUE TO DEFECTIVE MATERIAL

If metal fatigue originates from the interior, not the exterior, the material has some
defect and fatigue will break the tool. The picture below illustrates the broken section.
The starting point of breakage (tb9) is inside the tool, not on the surface.
WARRANTY
NPK Warranty does cover this type of failure.
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