- Base Temperature: 60 DegF
- Operating Temperature: 100 DegF
- Operating Pressure: 22 psig
- Meter Information: Nominal KFactor: 6300 pls/litre
- Commodity Group: Crude Oil (610.6-1163.5) kg/Sm³
- API Gravity @ 60 DegF: 30.0 °API
Disclaimer: This tool is provided for informational purposes only. FloSeer LLC assumes no responsibility or liability for any errors, inaccuracies, or outcomes resulting from the use of this tool. Use at your own risk.
ValiChex™ can help
ValiChex™ helps address critical measurement uncertainties in custody transfer operations by providing comprehensive error validation and correction capabilities.
ValiChex™ continuously compares tank level data with flow meter readings in real time, automatically identifying measurement discrepancies that could indicate transmitter drift, calibration errors, or systematic measurement biases. The system performs calculations in accordance with API and ISO standards and conducts material balance checks, ensuring that any deviations between expected and measured values are immediately flagged for investigation.
Key error categories highlighted by the tool
Temperature Errors – Tanks are equipped with their own temperature devices, and while the temperature at metering may not be the same as at the tank, due to factors such as distance between them and environmental effects, ValiChex™ calculates the gross standard volume of discharge and compares it against metering, allowing independent calculations using independent devices.
Pressure Errors – Calculations at the tank, for example in the case of a floating roof, are independent of a pressure device, and since ValiChex™ calculates the gross standard volume of discharge and compares it against metering, it allows independent calculations using independent devices.
Standard Density Error – Tanks have their own samples taken to determine oil properties, and the system calculates composite density from the tanks used and their contributions. For example, while an autosampler on the metering may use the same lab to perform the analyses, the reproducibility of the lab allows checks of multiple measurements as a consequence.
Meter Factor Error – While custody meters are periodically proved and may include fixed provers, the inclusion of intelligent meters, and in some cases their substantial turndown, coupled with problems in proving using displacement provers and the necessary increased footprint, has led to an increase in the use of master meters, often of the same type. For systems without fixed provers, and even those with them, deterioration of prover wall lining, sphere inflation, and pliability can result in gradual or sudden shifts. API addresses this by recommending control charts to allow monitoring of behavior, since this can cause significant bias. ValiChex™ performs independent calculation of standard volume using entirely independent measurements and can observe shifts immediately.