Tonnes per centimeter immersion (TPC) is a measurement used in naval architecture to determine the load-carrying capacity of a ship. It is defined as the weight (in tonnes) that a ship can carry per centimeter of its immersion (i.e., the depth to which the ship is submerged in water).
TPC is calculated by dividing the total weight of cargo, fuel, water, and other supplies that a ship can carry by the ship's immersion in centimeters. For example, if a ship can carry a total weight of 10,000 tonnes and has an immersion of 5 meters (500 centimeters), then its TPC would be 20 tonnes per centimeter immersion (TPC = 10,000 / 500 = 20).
TPC is an important measurement because it helps ship operators determine the maximum amount of cargo that a ship can safely carry while maintaining its stability and seaworthiness. If a ship is overloaded beyond its TPC, it can become unstable and pose a risk to the crew and cargo.
The TPC is also used in conjunction with other stability measurements, such as the metacentric height (GM), to ensure that a ship is safe and stable in various operating conditions, including rough seas and high winds.
By capt. NJS
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