EVS 918:2016

This standard gives guidance for calculating standard volume and mass of petroleum and liquid petroleum products (hereinafter liquids), stored in a tanks under atmospheric pressure.
This standard describes calculations for the determination of volume and mass of the liquids and the required measurements:
—  manual dip measurement of liquid stored in tanks with or without a floating roof;
—  manual cut dip measurement of free water;
—  manual measurement of the storage tank’s reference height;
—  manual measurement of the liquid’s temperature;
—  calculation of standard volume and mass of the liquid;
—  evaluation of measurement uncertainty of volume and mass of the liquid.
This standard is applicable under the following conditions:
—  density of the liquid shall be from 611,16 kg/m3 to 1163,86 kg/m3;
—  temperature of the liquid during measurements shall be between -25 °C and +100 °C;
—  smallest measurable height of the liquid shall not be less than 500 mm;
—  storage tank’s capacity table shall be made according to the requirements of applicable standard EVS-ISO 7507-1, EVS-ISO 12917-1 or EVS-ISO 12917-2;
—  tilt of the storage tank shall not exceed 3 %;
—  the difference of densities of the liquid stored in the tank and the reference density of the capacity table shall not exceed ±30 %.
NOTE This standard does not address the safety reguirements.