| 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? |
| A) An internal inspection of the non-metallic expansion joint is performed every 5 years regardless of the frequency of periodic vessel inspections. |
| B) An internal inspection of the non-metallic expansion joint is performed every 2.5 years regardless of the frequency of periodic vessel inspections. |
| C) An internal inspection of the non-metallic expansion joint is performed at every periodic ship inspection. |
| 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. |
