The entire world system concerning the sale and purchase of crude oil is based on internationally recognized standards for automatic sampling viz API 8.2 and ISO 3171.

These standards mandate that the liquid under test in the pipeline must be conditioned so that  the sample extracted is done isokinetically from a homogenized stream where the average water droplet size and distribution facilitates obtaining that average sample.

In the same way, EESIFLO ensures mixing of the fluid under test and ISOKINETIC flow through measurement to obtain a representative average water in oil value for the mixed stream.

This now means that the average representative sample obtained can be correlated with the average figure obtained on continuous online watercut measurement during a sample period.

For convenience it has been the practice to try to insert flow through instruments like densitometers, watercut meters and the like on bypass flow systems.  If the line where the bypass is extracting liquid is conditioned ,(well-mixed) then it is likely with sufficient loop velocity that reasonable readings may be obtained in the bypass. However, the bypass can never be isokinetic as the loop velocity  will not be the same as the main line velocity. Also, with isolation valves, strainers and other instruments , the bypass loop can be quite lengthy. 

Due to the length of the loop with a lower loop velocity, the water and oil mixture can separate and if the loop velocity is too high ,this can cause damage to loop instruments, vibration and even foaming of the water/oil mixture, which can lead to erroneous results and in sandy conditions the gradual filling of the bypass loop with sand.

Whether your needs are representative crude oil watercut measurement or sampling or both, EESIFLO International’s  successful ISOKINETIC systems completely take away the bother of the uncertainty produced by the bypass system.  For more information on supply of these products and systems, please contact our sales department