Device and method for preparing liquefied natural gas (LNG) fuel
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United States of America Patent
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Sep 2, 2014
Grant Date -
May 5, 2011
app pub date -
Mar 10, 2009
filing date -
Mar 10, 2008
priority date (Note) -
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Abstract
Apparatus (1) for providing a supply of natural gas fuel comprising a compressor (2) having an inlet (3) for a stream of natural gas (4), wherein the inlet (3) may be placed in fluid communication with an LNG storage tank (5) in order to provide a supply of boil-off gas (6) from out of the LNG storage tank (5), and an outlet (7) which may be placed in fluid communication with a natural gas supply pipe (8), characterised in that the compressor (2) comprises a first and subsequently a second compression stage (9, 10), wherein the first and the second compression stage (9, 10) take the form of labyrinth-sealed piston-compressors (11, 12) or piston-ring-sealed piston-compressors (15), and wherein the first compression stage (9) features a larger piston diameter than the second compression stage (10), and that the compressor (2) comprises at least a third subsequent compression stage (13, 14), which takes the form of a piston-ring-sealed piston-compressor (11, 12) or a labyrinth-sealed piston-compressor (15).
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