We are currently using a 6" D600 sensor from a 12" pipeline inlet then outlet from the sensor is 12" again. I am wondering if this affects the measurements we are experiencing recently with more than 1% variance for a heavy fuel oil custody transfer. Does it really affect the
measurement? Please help. Thanks.

 

Reducer and expansion would not normally affect a Micro Motion Coriolis model D600.
Q: Do you measure mass, volume or standard volume?
Q: How much varies pressure and temp?
Q: Same type of oil always/same density? If you measure mass this should no have any effect.

Regards,
Ulf

 

1% variance from what?? The suppliers' number?

Please describe your meter run - length & diameters upstream and downstream of the meter.

 

The pipeline upstream of the meter is a 12" diameter pipe then reduce to 6" for the sensor the expand to 12" downstream. Since the coriolis flow meter is used on custody transfers, the distance from the source tank is approximately 500 meters then going to the loading vessel is 200 meters. We are using the meter for the same product, Heavy fuel oil. We are measuring the volume.

 

A D600 is a Coriolis direct mass flowmeter. To get volume it also measures density. Mass divided by density gives volume. A D600 does both accurate and so will the result of the volume flow be, maybe ±0.15%.

But if you measure just volume, not standard or normal volume, you really don't know what you measuring, volume changes by the temperature.

Check the fluid temperature at the D600 meter and at your reference, if it's another meter/prover or the volume of the vessel.

Then you can look up a table of the density vs temperature of you measured fluid.

/Ulf