US 9,810,376 B2
Method and system for storage and transport of liquefied petroleum gases
Carl Jørgen Rummelhoff, Moss (NO)
Assigned to Wartsila Oil & Gas Systems AS, Asker (NO)
Filed by Wartsila Oil & Gas Systems AS, Asker (NO)
Filed on Mar. 29, 2016, as Appl. No. 15/84,318.
Application 15/084,318 is a division of application No. 13/143,023, previously published as PCT/NO2010/000166, filed on May 3, 2010.
Claims priority of application No. 20092477 (NO), filed on Jun. 30, 2009.
Prior Publication US 2016/0281930 A1, Sep. 29, 2016
Int. Cl. F25J 1/00 (2006.01); F17C 9/02 (2006.01); F17C 13/00 (2006.01); F25J 1/02 (2006.01)
CPC F17C 9/02 (2013.01) [F17C 13/004 (2013.01); F25J 1/0025 (2013.01); F25J 1/0236 (2013.01); F25J 1/0271 (2013.01); F25J 1/0277 (2013.01); F17C 2205/013 (2013.01); F17C 2205/0338 (2013.01); F17C 2221/035 (2013.01); F17C 2223/0153 (2013.01); F17C 2227/0135 (2013.01); F17C 2227/0157 (2013.01); F17C 2227/0164 (2013.01); F17C 2227/0339 (2013.01); F17C 2227/0341 (2013.01); F17C 2227/0351 (2013.01); F17C 2227/0388 (2013.01); F17C 2250/01 (2013.01); F17C 2260/013 (2013.01); F17C 2265/017 (2013.01); F17C 2265/034 (2013.01); F17C 2270/0105 (2013.01); F25J 2215/64 (2013.01); F25J 2215/66 (2013.01); F25J 2290/62 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for storage and transport of liquefied petroleum gas (LPG) on LPG carriers, in particular two cargoes of different LPG types on same shipment, having reliquefaction units in which vaporized gases are condensed and then returned into at least one cargo tank for the respective LPG cargo type, the method comprising:
using the reliquefaction units, at a minimum one running, so as to condense vapor from a first one of the cargo types to yield a first condensed vapor;
passing the first condensed vapor through a heat exchanger;
simultaneously flowing vapor from a second one of the two cargo types through the heat exchanger so as to condense the vapor to yield a second condensed vapor by means of heat exchanging with the first condensed vapor;
returning the first and second condensed vapors leaving the heat exchanger back into the respective cargo types; and
if free flow back to at least one cargo tank for the second cargo type is impeded, pumping the second condensed vapor to be returned into the second cargo type.