Rosemount Tank Gauging – Reliable and profitable radar based system

Tank gauging uncertainty costs money, since you might lose the value of the product volumes that you cannot verify with certainty. Improving the measurement accuracy in your tank gauging system reduces your margin of error, which means reduced uncertainty during transfer control/verification, inventory management, and loss control. The table shows how more precise tank gauging reduces your net volume uncertainty, and how much this translates to in financial savings. In our example, we use a crude oil tank. You can enter your own figures into the formula to see how large the savings would be on your own tank farm.



Fahrenheit and feet Celsius and meters

Sample tank

Your tank

Tank height (ft)

Tank diameter (ft)

170

Tank volume (bbls)

291 051

Product

Crude

Product price (USD/bbl), 1 barrel (bbl) is 159 liters

$120

Improvement of installed level accuracy with TankRadar Rex* (inches)

0.2

Improvement of installed temperature accuracy with multispot temperature sensor** (°F)

REDUCING UNCERTAINTY IN BATCH TRANSFERS

Average batch transfer size bbls

100 000

Reduction of uncertain volume, per transfer (bbls/tranfer)

180

Number of transfers per year

Reduction of uncertain transfer volumes per year, RMS*** (bbls/year)

696

Value of transfer uncertainty reduction per year for this tank

$83 538

REDUCING UNCERTAINTY IN INVENTORY

Reduction of uncertain volume for full tank (bbls)

198

Number of inventories per year

Reduction of uncertain inventory volumes per year, RMS*** (bbls/year)

687

Value of inventory uncertainty reduction per year for this tank

$82 451

*	5 mm (0.2 inches) is a typical improvement in level accuracy compared to other gauges. You can key in your own estimated value.
**	0.6 °C (1°F) is a typical improvement in average temperature accuracy compared to a single spot temperature sensor.
***	Root Mean Square Error (Statistical Error)

Precise levels. Rosemount TankRadar Rex has an instrument accuracy of ± 0.5 mm (0.02 in.) However, the installed accuracy is also determined by external factors. Rosemount TankRadar Rex often gives an installed accuracy increase of ± 5 mm (0.02 in.) compared with other measurement methods, such as floats, displacers, mechanical gauges, and less advanced radar sensors.

Precise temperature. The volume of the product is also dependent upon its temperature. A more exact temperature measurement provides a considerable reduction of the uncertainty associated with net volume measurement. Since products in a storage tank tend to stratify, the best measurement accuracy is achieved by measuring temperature at several different levels simultaneously with a multispot temperature sensor.

Disclaimer: These figures are realistic estimations based on our more than 30 years of radar tank gauging experience. However, Rosemount Tank Radar does not guarantee any specific saving for any specific tank in advance. Contact your local Emerson Process Management representative for more information and references.

On to calculate your OPEX