BS ISO 7507-3:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Precautions
5 Equipment
   5.1 Equipment for measurement of angles
   5.2 Stadia
6 Equipment set-up and procedure
   6.1 Preparation of tank
   6.2 Establishment of calibration conditions
   6.3 Set-up of theodolites and/or total stations
7 Stadia set-up and procedure
8 Measurement of horizontal distance between two theodolite
   stations using a stadia
9 Measurement of horizontal distance between two theodolite
   stations using a total station
10 Procedure for internal optical tank wall measurements
11 Procedures for external measurements
   11.1 General
   11.2 Reference circumference measured by strapping
   11.3 Reference distances measured between pairs of
        theodolite stations
12 Tolerances
   12.1 Distances between theodolites
   12.2 Horizontal angles
   12.3 Reference circumference
13 Other measurements for tank calibrations
   13.1 Tank-bottom calibrations
   13.2 Other measurements and data
14 Calculations and development of tank capacity tables
   14.1 From the internal procedure
   14.2 From the reference circumference procedure
   14.3 From the reference distances between pairs of
        theodolites
   14.4 Corrections
   14.5 Tank capacity table
Annex A (normative) Computation of internal radii from
                    internal measurements
Annex B (normative) Determination of the radius of the
                    circle by the least-squares method
Annex C (normative) Computation of internal radii from
                    reference circumference and external
                    measurements
Annex D (normative) Computation of internal radii from
                    reference distances between pairs of
                    theodolite stations
Annex E (informative) Calibration uncertainties
Annex F (normative) Procedure for checking the theodolite(s)
Bibliography

Defines 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.

This part of ISO7507 specifies a calibration procedure for application to tanks above 8m 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 (Clause10) or externally (Clause11). The external method is applicable only to tanks that are free of insulation.

This method 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 ISO7507-1.