For how long can a steel buoy remain on scene under normal circumstances?

A steel buoy can typically remain on scene for a duration of up to 6 years under normal circumstances. This lifespan is based on a combination of factors including environmental conditions, maintenance schedules, and the corrosion resistance of the materials used in constructing the buoy.

Steel buoys, while durable, are subject to wear and tear from conditions like wave action, weather, and potential impact from vessels. Regular inspections and maintenance can help extend their functional life, but the 6-year period is viewed as a standard expectation before a buoy should be replaced or refurbished to ensure that it continues to serve its purpose effectively.

The other options indicate either a shorter or longer lifespan than what is commonly accepted for steel buoys, which further emphasizes the importance of adhering to industry standards and practices for buoy maintenance and replacement.