Audited Supplier
Hand-held prover tank/ Measure can
Materials: SS304
Volume: 1,2,3,5,10,20,50L
Provers are the necessity in the gas station for metering the liquid. it is composed of:
Bleed lines are required (instead of bleed valves) on all new provers where air may be entrapped in the dry break coupler and lines going to it.
The level condition of volumetric field standards must be determined by using levels to plumb the neck rather than depending on the top of the neck to be level. The levels on volumetric field standards will be adjusted to agree with this level condition.
Values in the four tables have been updated and the minor scale division (subdivision) is defined as the neck uniformity tolerance.
Size Declaration:
Nominal volumes in each system are ideally selected in multiples of 1, 2, and 5 (liters or gallons) to facilitate calibration. However, a prover may be built to any size to meet specific needs. Non-standard size volumetric field standards that comply with all other requirements shall be considered to be in full compliance with this standard.
The temperature at which test measures and provers are referenced during calibration and during use for testing petroleum products is generally 15.56 °C (60 °F). International standards reference petroleum products to 15 °C. Provers may be used for applications other than petroleum products or in areas where a different reference temperature is used for petroleum products. In such cases, the appropriate reference temperature for the application should be identified and used. For example, the reference temperature for provers used in testing milk is 4.44 °C (40 °F).
Neck diameter of prover may vary; the critical factors to be considered which affect neck diameter is the volume above and below nominal, the graduation sizes, the minimum space between graduations and the use of fill pipes and vapor recovery systems.
* "Total neck volume" is defined as the volume contained in the neck between the bottom-most
scale graduation and the top-most scale graduation." If increased readability of range or
increased sensitivity is desired, the length of the reading scale on the prover may be adjusted with proportional adjustment of neck diameter, provided vehicle/mounted height constraints are not exceeded.
