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1. (WO2018080309) TANK BLANKETING SYSTEM AND METHOD

Pub. No.:    WO/2018/080309    International Application No.:    PCT/NO2016/050210
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Wed Oct 26 01:59:59 CEST 2016
IPC: B65D 90/44
B01D 53/72
Applicants: EQUINOR ENERGY AS
Inventors: HILDÉN, Tor Erik
NEERAAS, Bengt Olav
NORDTVEIT, Reinert
Title: TANK BLANKETING SYSTEM AND METHOD
Abstract:
A hydrocarbon gas blanketing circuit for a cargo tank 10 on an oil tanker comprises a blanket gas recovery unit 16, 18, 20, 22 that liquefies a portion of a hydrocarbon blanket gas displaced from the cargo tank 10 during loading of crude oil 12 into the cargo tank 10, a liquefied blanket gas storage tank 26 that receives and stores the liquefied hydrocarbon blanket gas from the blanket gas recovery unit 6, 18, 22, 22, and a gas vaporisation unit 34 that vaporises sufficient liquefied hydrocarbon blanket gas from the liquefied gas storage tank to maintain a gas blanket 14 within the cargo tank 10. During transport, some of the hydrocarbon gas blanket 14 may be absorbed by the crude oil 14. If there is insufficient liquefied hydrocarbon blanket gas available within the gas blanketing circuit, then a make-up unit responsively supplements the gas blanketing circuit using liquefied petroleum gas stored in a 1 make-up tank 36, 38 that is separate from the gas blanketing circuit.