How many years is the scrapping period of inland river ships?

Old river vessels are divided into the following types:

(1) A high-speed passenger ship with a ship age of more than 1 years is an old river ship;

(2) Ro-Ro passenger ships, passenger and cargo ships, passenger ferries, passenger and cargo ferries (including passenger train ferries), tourist ships and passenger ships with a ship age of more than 1 years are old river ships of Class II;

(3) Oil tankers (including asphalt tankers), bulk chemical tankers and liquefied gas tankers with a ship age of more than 16 years belong to Class III old river ships;

(4) Bulk carriers and ore carriers with a ship age of more than 18 years belong to four types of old river ships;

(5) cargo ro-ro ships, bulk cement ships, refrigerated ships, general cargo ships, multi-purpose ships, container ships, timber ships, tugboats, pushers, barges (including oil barges) with a ship age of more than 2 years belong to five types of old river ships.