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Perfecting liquefied natural gas analysis techniques and methods

07.01.2010  |  Hale, S. ,  Emerson Process Management, Houston, Texas

Following these procedures will improve measurement accuracy and reliability

Keywords: [liquefied natural gas] [analyzers]

The nature of liquefied natural gas (LNG) raises many challenges when it comes to the measurement and reporting of its composition for the purpose of ship loading and unloading. LNG’s extreme temperature, and the difficulty with keeping it in liquid form, introduce unique sample-handling issues, while the batch-handling operation makes reporting difficult. At the same time, the accuracy and reliability of the LNG measurement is uniquely critical since the loading and unloading operations are highly time-sensitive with no second chances. Delays in loading or unloading because of measurement issues are not tolerable when the cost of keeping a ship in port is considered. For example, one LNG operator had two measurement systems fail right before the docking of a large tanker—a problem that could have resulted in significant penalties had the failures not been remedied heroically. Additionally, disparities in the measurement are often not known until after the unloading is complete at the destination and comparisons to the load report are made.

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