NIRS and the Verax VPA
Near infrared spectroscopy (NIRS), combined with chemometrics, offers an alternative to the conventional vapor measurement processes. By passing near infrared light through the sample and measuring the absorption, it is possible, with the application of chemometrics, to determine the vapor pressure (and other aspects) of the process. More information on NIRS can be found here.
The core of the Verax VPA is of a pair of optical probes. It is these probes that project and measure the near infrared energy. These probes are capable of functioning at operational temperature and pressure and as such, can be mounted with direct access to the process. This positioning in turn eliminates the need for a sample collection system or a sample conditioning system.
In the case of condensate, this lack of conditioning means that the process is kept at a higher temperature and the paraffin in the process cannot condense. In practical terms, this means a decrease in operational costs and an increase in system up-time.
In the case of crude oil, the speed and accuracy of the analysis means that changes in vapor pressure can be detected quickly. Problems like pumping cavitation can then be prevented with prompt changes to temperature or pressure.
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