Calibration of volume standards and storage tanks
Volumetric standards are standard capacity measures mostly made of glass, copper or stainless steel.
The capacity of volumetric standards (capacity measures) with nominal contents up to 1000 l is determined gravimetrically. In this procedure the volumetric standard to be calibrated is filled with a test liquid (water) up to a graduation line. After that the mass and density of the test liquid are determined and the capacity can be calculated from these two input quantities.
Capacities of volumetric standards with nominal contents up to 30 m³ can also be determined directly (volumetrically) by discharge into a calibrated standard.
The volume of storage tanks is either determined by gauging the capacity by litres with flow meters (wet measuring) or by using the optical method (dry measuring).
The capacity of volumetric measuring instruments made of glass, like volumetric flasks, graduated cylinders, burettes and pipettes is determined gravimetrically. The test liquid is distilled water.