ISO 7507-3:2006 specifies a calibration procedure for application to tanks above 8 m in diameter with cylindrical courses that are substantially vertical. It provides a method for determining the volumetric quantity contained within a tank at gauged liquid levels. The measurements required to determine the radius are made either internally or externally. The external method is applicable only to tanks that are free of insulation. ISO 7507-3:2006 is suitable for tanks tilted up to a 3 % deviation from the vertical, provided that a correction is applied for the measured tilt as described in ISO 7507-1.

The OIML-CS is a system for issuing, registering and using OIML Certificates and their associated OIML type evaluation/test reports for types of measuring instruments (including families of measuring instruments, modules, or families of modules), based on the requirements of OIML Recommendations.

France has developed and been using an Optical Triangulation Method (OTM) which uses the measurement of tank angles to determine the tank diameter. This method again provides a means for calibrating vertical cylindrical tanks using external measurement of angles with a theodolite or a laser theodolite. The method also requires a measured reference circumference (same as ORLM), determined by manual strapping at its bottom course. The theodolite being used must have an angular graduation and inaccuracy equal to or less than 0.022 degrees to ensure the required accuracy of measurement is achieved.

A passive optical speed and distance measuring system includes a pair of camera lenses positioned along a common baseline a predetermined distance apart and controlled by an operator to capture images of a target at different times. The camera lenses are focused on light sensitive pixel arrays which capture target images at offset positions in the line scans of the pixel arrays. A video signal processor with a computer determines the location of the offset positions and calculates the range to the target by solving the trigonometry of the triangle formed by the two camera lenses and the target. Once the range to the target is known at two different times the speed of the target is calculated.

EODR methodology is an extension of the standard triangulation measurement techniques, but with the added advantage of measuring the distance between the instrument and the target point, referred to as the "slope distance." Measurements are made from a firm, stable point, close to the center of the tank.

Whether it be an inclined horizontal tank whose volume increases exponentially, a tank with uneven bottom, dished ends, blades and heating coils inside, a complicated bottom shell arrangement, a floating roof tank with liquid displacement to be taken care of, a pressurized Horton sphere or a horizontal bullet, we are always a step ahead of a critical assignment – our engineering capability speaks on the ground. We have developed unique correlated physical, mathematical and error free volumetric solutions. Calibration or survey data can be provided on CD or sent via email in spreadsheet format, also for SAP and other integration.

We are one of the leading Sphere Tank Calibration service providers in the market. Although Spherical tanks are less prone to top defects like settling and tilting, they still face the danger of assimilating the impurities in the centre of the tank, which can hamper the quality of the product stored in the tank. We provide accurate measurements and mark the tanks accordingly so that cleaning and rework if required can be done on time.