Patent ID: 9273675
Filing Date: 2016-03-01
CPC Classification: B63J,F04B,Y02T

Claim Text:
1. A method for creating a supply of natural gas fuel for a combustion engine, comprising: obtaining boil-off gas from a liquid natural gas storage tank containing liquefied natural gas, compressing the boil-off gas in a compression stage consisting of a labyrinth-sealed piston-compressor to obtain a natural gas fuel, and compressing the natural gas fuel in a compression stage consisting of a piston-ring-sealed piston-compressor, compressing the natural gas fuel to a pressure of between 100 Bar and 500 Bar, and making the natural gas fuel available at an outlet, wherein the piston-ring-sealed piston-compressor has a bypass extending from a position downstream of the piston-ring-sealed piston-compressor to a position between the labyrinth-sealed piston-compressor and the piston-ring-sealed piston-compressor, and wherein the natural gas fuel is returned via the at least one bypass such that the natural gas fuel at the outlet is at a required target pressure.