Should a vessel requires to change fuel during a voyage, it is necessary to quickly analyze the compatibility of the fuel. If not handled properly, the main engine will lose power or the fuel system will be disabled, resulting in extensive cleaning work which is time-consuming and laborious. However there are some basic precautions that can be taken to avoid adverse consequences caused by fuel incompatibility, in which relatively easier compatibility testing can be performed on board.

The ASTM D4740 test method, also known as the "SPOT TEST", can be used on board to determine fuel compatibility. The ASTM D4740 test method requires that the two fuels are mixed evenly and heated, which then is dripped on the filter paper, heated to 100°C in an oven, and then is carefully observed after one hour.

The convenience and operability of a test instrument during mid-voyage is very important. In response to the challenges of ship fuel oil change, AD Systems has developed the ST 10 automatic portable fuel stability and compatibility tester, which is convenient for piers and on ship when sailing out into the ocean.

The ST 10 integrates sample conditioning, spot preparation, spot drying, and an automated grading system all-in-one carrying case. Users only need to take samples and use a pipette to deposit oil droplets. They can complete the test and analyze the results without the need for extensive training, which increases convenience when analyzing the compatibility of the fuel oil on ship or at the dock.

The ST10 Portable Residual Fuel Stability and Compatibility Tester is a "snap-and-go" product to help on your ocean voyages.