Table 1.6—Flow Correction Factors
Flow Correction Factor Description
Crude Oil Shrinkage
Factor
This correction factor allows users who are measuring crude oil to automatically
correct their liquid volume measurements for the effects of gas content. When the oil
is discharged from a pipeline to a stock tank at atmospheric conditions, the volatile
components in the oil evaporate, causing a reduction in liquid volume. When live oils
are metered (e.g., test separators), a shrinkage factor must be applied to correct the
measured liquid volume from the metering pressure and temperature to stock tank
conditions unless the meter is proved to stock tank conditions. Shrinkage volumes are
typically obtained with a shrinkage tester. This correction method will correct the meter
reading for both dissolved gas and for oil volume reduction. It will not compensate for
the effects of uid viscosity changes. Shrinkage volumes or factors are often used to
mitigate safety and environmental concerns when live oil volumes are measured at high
pressures or when the live oil contains hydrogen sulde (H2S).
Base Sediment and Water
(BS&W) Correction Factor
Crude oil generally contains some water. The BS&W correction provides a means
of discounting the water content and totalizing only the crude. The correction can be
based on a user-entered value (assumed to be constant) or on a watercut monitor/
BS&W monitor output to the Scanner 3100 via a 4-20 mA signal.
26
Section 1 Scanner 3100 EFM
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