BS 7723-3:1994

Committees responsible
National foreword
Introduction
1 Scope
2 Normative reference
3 Definitions
4 Precautions
5 Equipment
6 Equipment set-up and procedure
7 Measurement of distance between two theodolite
     stations
8 Procedure for internal optical tank wall measurements
9 Procedures for external measurements
10 Tolerances
11 Other measurements for tank calibrations
12 Calculations and development of tank capacity tables
Annexes
A (normative) Computation of internal radii from
     internal measurements
B (normative) Determination of the radius of the circle
     by the least-square method
C (normative) Computation of internal radii from
     reference circumference and external measurements
D (normative) Computation of internal radii from
     reference distances between pairs of theodolite
     stations
E (normative) Method for calibrating bottoms of tanks
F (normative) Specification for dip-tape and dip-weight
Tables
1 Minimum number of points per circumference for
     internal procedure
2 Minimum number of theodolite stations for external
     procedures
3 Tolerance on distance between theodolites
4 Tolerance on reference circumference
B.1 Data for example
B.2 Calculated coordinates
B.3 Solution by iteration
Figures
1 Measurement of distance between two theodolites
2 Example of locations of theodolite stations and wall
     points for internal procedure
3 Location of horizontal sets of points on tank walls
4 Horizontal angles between sightings on points on tank
     wall and the reference axis TL
5 Example of theodolite station locations for external
     procedure based on a reference circumference
6 Example of theodolite station locations for external
     procedure based on reference distances between pairs
     of theodolites
B.1 Circle and coordinates
C.1 Radii from reference circumference
D.1 External radii from reference distances between pairs
     of theodolite stations

Specifies a calibration procedure for application to tanks above 8 m in diameter with cylindrical course that are substantially vertical. Gives a method for determining the volumetric quantity contained within a tank at gauged liquid levels. Coverage includes: equipment set up and procedure; measurement of distance between two theodolite stations; procedures for external measurements; other measurements for tank calibrations; calculations and development of tank capacity tables. Also gives definitions, tables and annexes.