The Regulations on Collection,Custody and Use of Commercial Port Dues Article 8

No ship port dues shall be collected from the following ships entering the port:1.Public services ships used by government, or ships under government's requisition or employment.2.Ships approved by commercial port authority that carry salvation materials.3.Ships calling the port to take refuge, accepting examinations, add oil, or add water.4.Ships calling the port for emergency medical aid or for repairing machinery.5.Ships with gross registered tonnage of less than 700 tons.6.Ships purchased or sold exclusively for the use of the transportation services.
中文原文 商港服務費收取保管及運用辦法第8條
下列入港之船舶,免收船舶商港服務費:
一、政府使用之公務船舶或經政府徵用或僱用之船舶。
二、經航港局認定確屬運載救濟物資之船舶。
三、因避難、接受檢查、加油或加水而入港之船舶。
四、為緊急醫療求助或機件搶修而入港之船舶。
五、總噸位為七百以下之船舶。
六、購入或出售專供運輸使用之船舶。

English translation for reference only; the Chinese text prevails. Not legal advice.