What is the change in longitudinal moments for the Coastal Driller if 2.0 feet of drill water is transferred from a full drill water tank 23 to an empty drill water tank 1?

Correct Answer: Option D — 15,565 foot-kips decrease

Longitudinal moment changes during liquid transfers equal the transferred weight multiplied by the distance between tank centers. Transferring 2.0 feet from tank 23 to empty tank 1 alters longitudinal weight distribution significantly, resulting in a net decrease of 15,565 foot-kips per hydrostatic tables.