US 11,808,411 B2
Cargo stripping features for dual-purpose cryogenic tanks on ships or floating storage units for LNG and liquid nitrogen
Donghwan Lee, The Woodlands, TX (US); and Sathish Balasubramanian, The Woodlands, TX (US)
Assigned to EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY, Spring, TX (US)
Filed by EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY, Spring, TX (US)
Filed on Jun. 30, 2020, as Appl. No. 16/917,038.
Claims priority of provisional application 62/904,966, filed on Sep. 24, 2019.
Prior Publication US 2021/0088185 A1, Mar. 25, 2021
Int. Cl. F17C 7/00 (2006.01); F17C 7/04 (2006.01); F04B 15/08 (2006.01); F17C 6/00 (2006.01); B63B 25/16 (2006.01); B63B 25/08 (2006.01)
CPC F17C 7/04 (2013.01) [F04B 15/08 (2013.01); F17C 6/00 (2013.01); B63B 25/16 (2013.01); B63B 2025/087 (2013.01); F17C 2223/0161 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A carrier for storing and transporting cryogenic liquids, comprising:
a tank configured to store and transport a cryogenic liquid having a liquefaction temperature;
a first pump configured to fill the tank with the cryogenic liquid and empty the tank of a first portion of the cryogenic liquid, thereby leaving a second portion of the cryogenic liquid in the tank;
a tank structure that focuses the second portion of the cryogenic liquid at a location on a bottom of the tank;
a second pump located at the location and configured to empty the tank of the second portion of the cryogenic liquid except for a residual portion of the cryogenic liquid that is left therein; and
a focused heating structure configured to deliver heat to the location on the bottom of the tank;
wherein the heat is configured to raise a temperature of the residual portion above the liquefaction temperature, thereby vaporizing all of the residual portion.