| According to 46 CFR regulations pertaining to periodic tests and inspections as related to fired thermal fluid heaters, regarding hydrostatic tests, what statement is true? |
| A) When the marine inspector determines that a hydrostatic test is warranted, the system must be completely drained and re-pressurized with compressed air. |
| B) When the marine inspector determines that a hydrostatic test is warranted, the system must be completely drained and refilled with water as only water can be used as a hydrostatic test medium. |
| C) When the marine inspector determines that a hydrostatic test is warranted, the system must be completely drained, cleaned with an appropriate solvent, and refilled with water as only water can be used as a hydrostatic test medium. |
| D) When the marine inspector determines that a hydrostatic test is warranted, the fired thermal fluid heater heating medium fluid can be used as a hydrostatic test medium. |
