When using a pneumatic chipping tool all of the following are TRUE except?

Correct Answer: Option D — The needles of the needle-type chipping gun must be replaced when they have been blunted more than ½ of their diameter.

Needle-type chipping guns are effective for removing scale, but the needles do not require replacement based on a 50% diameter reduction. Maintenance schedules for these tools are typically based on performance degradation or mechanical failure, making the statement regarding the 1/2 diameter wear limit technically incorrect for this equipment.