Tank Calibration Procedures

Tank calibration is performed to measure storage tanks, barges, ships or any other container that holds liquid consecutively. Measurements allow for the calculation of capacity. Calibration data must always reference the name and location of the project. Tank calibration is performed as a strict controlled procedure. Results should be recorded and reported properly with appropriate follow-up when applicable.

Fill Tanks

• At the beginning of a tank calibration, tanks must be filled to appropriate fill levels. During this time vents must be open and all outlets and manholes should be covered properly where applicable.

Observation and Recording

• Before the first draw-off the tanks are observed and precision pressure tester is recorded. During this process the inlet valve of the calibrator is opened to allow a fill. Valves are closed as soon as water rises to the final level in correspondence with level sight. Filled calibrators are then observed with readings recorded from the precision pressure tester or digital indicator.

Repeat

• The previous procedures are repeated and completed for each draw-off of every filled calibrator.

Final Analysis

• The last and final draw-off should show the calibration measurement---weight or volume, calibration standard---volume of calibrator, meter and weigh scale and the water temperature.

Reports

• Reports should be submitted with the calibration data log sheet when forwarding results of the calibration order to appropriate personnel. All calibration reports are to be protected from damage or loss, as they are valuable and very expensive to conduct.