While in a foreign port, burning and welding repairs are to be carried out on a section of heating coil located in a tank having last contained a grade "D" product. Which of the following procedures should be followed when a certified marine chemist is not available?

Correct Answer: Option D — Prior to any hot-work, an inspection must be made by the senior officer present, and an entry made in the official logbook.

In the absence of a certified Marine Chemist, the senior officer present must assume responsibility for safety. This involves a thorough inspection and documentation in the official logbook to ensure all precautions are taken before authorizing hot work, maintaining compliance with safety standards when professional third-party certification is unavailable.