Perfecting liquefied natural gas analysis techniques and methods
Following these procedures will improve measurement accuracy and reliability
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. LNGs 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 tankera
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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