Maritime Act Article 104

Salvage operations carried out by and for the ships of the same owner may still claim for a salvage reward.Salvage operation carried out by the tug on the tow may still claim for a salvage reward as long as the services rendered was beyond the performance of the above said duty.
中文原文 海商法第104條
屬於同一所有人之船舶救助,仍得請求報酬。
拖船對於被拖船施以救助者,得請求報酬。
但以非為履行該拖船契約者為限。

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