PRODUCTION • PROCESSING • HANDLING
for example, it is ideal to take many representative samples throughout the entire offloading process to a tanker or ship as possible.”
CALIBRATION AND PREDICTIVE MODELLING Although the MarqMetrix Raman equipment can be used to identify the components in LNG within approximately 15 minutes of unboxing, quantifying the concentrations of each component first requires creating a predictive model. To do this, ASaP establishes the accuracy of the Raman equipment at one of its three analytical testing facilities by comparing it against measurements produced by traditional GC equipment, with LNG supplied from a nearby filling station. “We use certified GC testing
instruments to produce a reference value that we know will be as close to the actual
value as possible,” explains Mendez. “We then take a measurement using the Raman equipment and compare the two (correlate the two measurements to build the model). Te next step is to calibrate the Raman with a liquified primary gas standard. “We take a number of samples of LNG at different component concentrations and with the help of multivariate analysis we can create our predictive model,” adds Mendez. “Once the model has been validated, ASaP clients no longer need to use GC and can use Raman exclusively for instantaneous readings of the LNG composition.” Accurate measurement is more essential than ever in the LNG industry for understanding the
chemical composition of raw materials and the consistency of
processed products. With the advancements made in applying Raman spectroscopy systems to sample measurement, LNG producers have a practical tool for generating accurate real-time compositional measurements for their in-process and in-transit LNG sampling needs. “With the
availability of The AIO system works with an
array of contact probes suitable for LNG applications
easy-to-use commercial instrumentation, the threshold to work with Raman spectroscopy
has now become approachable and workable for LNG applications,” concludes Mendez.
The system can effectively withstand direct contact with the sample even in
extreme cold and hot environments and harsh corrosive conditions
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