BS 7550-2:1993

Committees responsible
National foreword
Method
1. Scope
2. Normative references
3. Definitions
4. Precautions during measurement
5. Equipment
6. Preparation
7. Measurement
8. Coordinate system
9. Calculation
10. Data processing
11. Calculation procedure
12. Calibration table
Annexes
A. (informative) Safety precautions
B. (informative) Calibration uncertainty
C. (informative) Example of main gauge table at
     -160 deg C
D. (informative) Example of trim correction table
E. (informative) Example of list correction table
F. (informative) Example of correction table for
     tank shell expansion or contraction
Figures
1. Example of marking
2. Set-up of instruments for determining the height
     of the base point
3. Location of benchmarks and target
4. Example of shoe arrangement for platform
5. Setting of subtense bar
6. Measurements with the theodolite on point A
7. Measurement of the target
8. Coordinate system for calculation
9. Data for calculation of the coordinates of base
     points (A,B)
10. Data measured for coordinate determination
11. Data for calculation of relative lengths
12. Calculation order
13. Horizontal angles for determining base point
     coordinates
14. Coordinates of a target
15. Transformation from local coordinate (x',y',z')
     system to basic coordinate (x,y,z) system

Specifies a triangulation method for the internal measurement of spherical tanks in liquefied gas carriers. Also sets out the calculation procedures for compiling the calibration tables to be used for measuring cargo quantities. Coverage includes definitions, equipment, data processing, coordinate system, and calculation. Also includes annexes and diagrams.

1.1 This part of ISO 9091 specifies a triangulation method for the internal measurement of spherical tanks in liquefied gas carriers.

1.2 This part of ISO 9091 also sets out the calculation procedures for compiling the calibration tables to be used for the measurement of cargo quantities.