Original subtitles

Positive displacement meters are still the most prolific custody transfer meter

in the world today.

Since they directly measure volume, they are also one of the most accurate and

reliable meters for measuring the volume of petroleum products.

They measure volume directly by continuously separating the flow stream

discrete volumetric segments and precisely measuring this volume in a

measurement section.

In this animation, we see a Smith Meter rotary vane PD meter in operation.

As the transmitter, calibrator housing, and cover with transfer gears are

removed, we see the heart of the meter, the rotary vane design.

The fluid flow enters the meter on the left side.

The block at the bottom of the meter separates the inlet from the outlet and

prevents the fluid from bypassing the measuring chamber.

Instead, it is channeled around the rotor into the measurement section.

The fluid is continually separated into discrete segments in the measurement

section. The path of a single fluid segment is highlighted in yellow.

As the measured fluid segment is discharged from the meter on the right,

rotor cover is removed and we see the blades rotating around the shaft.

The blades are extended and retracted as the blade rollers follow the profile of

the stationary cam.

The fluid flow drives the rotation of the rotor and blade assembly in a

continuous sequence.

The rotor assembly is connected to the meter output shaft by a gear coupling.

Each revolution of the output shaft, therefore, represents a precise volume

has passed through the meter.

The external gear train changes the meter volume into the preferred

unit, such as gallons, barrels, or liters.

The output shaft can be directly coupled to a mechanical calibrator and counter.

or as illustrated, into a pulse generator.

Each output pulse represents a precise amount of fluid that has passed through

the meter.

The continuous pulse stream is then transmitted to an electronic counter or

computer to indicate both instantaneous flow and total metered volume.

FMC Technologies.

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