§ 12120. Liquified gas tankers
Notwithstanding any agreement with the United States Government, the Secretary may issue a certificate of documentation with a coastwise endorsement for a vessel to transport liquified natural gas or liquified petroleum gas to Puerto Rico from other ports in the United States, if the vessel—
(2)
was documented under this chapter before that date, even if the vessel is placed under a foreign registry and subsequently redocumented under this chapter for operation under this section.