What action should be taken before entering port regarding boiler tubes?

Blowing the tubes is an essential action to take before entering port regarding boiler tubes. This procedure involves using a high-pressure blowdown to clean out the tubes, removing any accumulated sediment, scale, or deposits that could affect the performance of the boiler. This is particularly important in ensuring the integrity and efficiency of the boiler system, as any blockage or buildup can lead to overheating, reduced efficiency, or even catastrophic failure.

By blowing the tubes, you help maintain the boiler's operational readiness, allowing it to function efficiently while docked or preparing for the next journey. Proper maintenance and cleanliness of the boiler system are critical for safety and performance, especially in a maritime context where the implications of boiler failure can be severe.

Other actions—such as inspection only, reducing water levels, or increasing steam pressure—may not provide the immediate cleaning benefits required for proper boiler operation before entering port. While inspections are certainly important, they do not improve the operational condition of the tubes. Adjusting water levels or steam pressure can have various impacts on the system's performance but do not address the cleanliness of the boiler tubes directly. Hence, blowing the tubes is the most effective and proactive measure to ensure boiler system reliability.