Underdeck tonnage

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Underdeck tonnage (UDT) is the measurement, in tons, of the space below a ship's tonnage deck and above its double bottom. In ships with two decks, the tonnage deck is the upper deck; though it is generally the second deck from above in ships with more than two decks. [1] Underdeck tonnage is applied using Simpson's first rule of ship stability. [2] It is measured in gross cubical capacity. [3]

References

  1. ↑ "Underdeck tonnage – xSHIPx- Shipping News" . Retrieved 2025-06-28.
  2. ↑ "46 CFR § 69.109 - Under-deck tonnage". LII / Legal Information Institute. Retrieved 2025-06-28.
  3. ↑ "Definition of UNDERDECK TONNAGE". www.merriam-webster.com. Retrieved 2025-06-28.


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