According to 46 CFR regulations pertaining to periodic tests and inspections as related to piping systems, under what circumstances is an internal inspection of a non-metallic expansion joint performed by the marine inspector?

Correct Answer: Option D — An internal inspection of the non-metallic expansion joint is performed whenever an external inspection reveals excessive wear or other signs of deterioration or damage.

Under USCG National Maritime Center examination standards, the accepted correct answer is: An internal inspection of the non-metallic expansion joint is performed whenever an external inspection reveals excessive wear or other signs of deterioration or damage..