When should FS samples be taken?

The practice of taking FS (Fuel System) samples is crucial for ensuring the quality and safety of the fuel used in gas turbine systems. Sampling five minutes after initial operation and then every four hours thereafter is a standard procedure to assess the fuel for any impurities or contaminants that may affect turbine performance.

Taking samples shortly after operation allows for the detection of any unexpected issues that may arise when the fuel is actively being used, while the four-hour intervals ensure that consistent checks are maintained throughout the operational period. This frequency helps in early identification of any changes in fuel quality, such as sediment accumulation or water contamination, that can occur over time as the system operates. Monitoring at these intervals is essential for maintaining the integrity of the gas turbine system and preventing potential operational failures.

The other options do not provide a suitable timeframe for sampling. For example, taking samples immediately after tank placement does not account for the status of the fuel once it is in operation, and sampling every hour might be excessive and not practical. Daily sampling may miss critical changes occurring throughout the day. Therefore, the chosen approach effectively strikes a balance between thorough monitoring and operational feasibility.