Analytical Instrumentation

Pure Sampling™ Valve Technology and TVP method of ERAVAP

Nov 30 2017 Read 464 Times

The rising concentration of oxygenates in modern fuels around the world is a challenge for all VP testers. Test results from various manufacturers presented by the ASTM D02 group showed that testing fuels with high Ethanol content directly after a QC measurement with Pentane can affect vapour pressure measurement results. The reason for this effect is the risk of cross contamination, as Pentane does not dissolve well in e.g. Ethanol.

Eralytics uses its unique patented Pure Sampling™ valve technology to minimize this risk of cross contamination. Even considering the worst case of measuring pure ethanol directly followed by a QC measurement with Pentane, vapour pressure measurement results still fall into the allowed results range for Pentane defined in ASTM D5191 or ASTM D6378 if measured with ERAVAP.

Another parameter gaining more and more importance is the True Vapour Pressure (TVP) of crude oil at a V/L ratio of 0. TVP is a very important safety parameter as it represents the highest possible pressure that can build up inside a tank or rail car at a given temperature. It is extrapolated from at least three different V/L ratio measurements as a measurement at V/L=0 isn’t possible. This essential parameter is now available in all ERAVAPs equipped for crude oil measurements.

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