Patent ID: 7337616
Filing Date: 2008-03-04
Classification: F17C,F25J,G01N,Y10T

Abstract:
1. A sampling system for sampling a cryogenic liquid of at least one of oxygen and nitrogen containing impurities of at least one of nitrous oxide, carbon dioxide and hydrocarbons, comprising: a flow line adapted to flow the cryogenic liquid; a sampling line connected at a first end to the flow line and adapted to flow at least portions of the cryogenic liquid from the flow line, wherein the sampling line is connected to the flow line such the at least portions of the cryogenic liquid flows in a first direction towards a second end of the sampling line, the first direction being generally upwards relative to a flow direction of the cryogenic fluid; a vaporizer fluidly coupled to the second end of the sampling line, wherein the vaporizer comprises at least one wall and is configured to increase a heat exchange between the at least one wall and a surrounding atmosphere, and wherein the at least portions of the cryogenic liquid passes through the vaporizer in at least a second direction, generally opposite the first direction, and comes into contact with the at least one wall and vaporizes into a gaseous phase; means for maintaining the at least one wall at a temperature above at least one of a sublimation temperature and a boiling point temperature of a least volatile impurity contained in the cryogenic liquid; means for withdrawing the gaseous phase from a downstream end of the vaporizer and for introducing the gaseous phase to an analyzer; and means for controlling the flow rate of the gaseous phase.