ISO 7507-2:2022
Petroleum and liquid petroleum products — Calibration of vertical cylindrical tanks — Part 2: Optical-reference-line method or electro-optical distance-ranging method
This document specifies methods for the calibration of tanks above eight metres in diameter with cylindrical courses that are vertical. It provides two methods for determining the volumetric quantity of the liquid contained within a tank at gauged liquid levels.
NOTE For optical-reference-line method, the optical (offset) measurements required to determine the circumferences can be taken internally or externally, provided that insulation is removed if tank is insulated.
The methods are suitable for tilted tanks with up to 3 % deviation from the vertical provided that a correction is applied for the measurement tilt, as described in ISO 7507-1.
These methods are alternatives to other methods such as strapping (ISO 7507-1) and the optical-triangulation method (ISO 7507-3).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Precautions
5 Equipment
5.1 Equipment for tank strapping
5.2 Optical-reference-line method
5.3 Electro-optical distance-ranging (EODR) method
6 Procedure
6.1 Principle
6.2 Preparation of the tank
6.3 Reference circumference
6.4 Offset readings by optical reference line method
6.5 Offsets measured by electro-optical distance-ranging method
6.5.1 EODR instrument set-up
6.5.2 EODR calibration procedure
6.6 Tank bottom calibration
6.7 Other measurements and data
7 Tolerances
8 Tank capacity table calculation procedure
8.1 Outside circumference
8.2 Corrections
8.3 Tank capacity table
Annex A (informative) Tank calibration uncertainties for optical-reference-line method
Bibliography
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Related Information
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BS 7550-1:1992
Calibration of spherical tanks for refrigerated light-hydrocarbon fluids in ships, Method of stereo-photogrammetry
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BS 7550-2:1993
Calibration of spherical tanks for refrigerated light-hydrocarbon fluids in ships, Triangulation method
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BS 7702:1993
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BS 7723-2:1994
Methods for calibration of vertical cylindrical tanks for petroleum and liquid petroleum products, Optical-reference-line method
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Precautions
5 Equipment
5.1 Equipment for tank strapping
5.2 Optical-reference-line method
5.3 Electro-optical distance-ranging (EODR) method
6 Procedure
6.1 Principle
6.2 Preparation of the tank
6.3 Reference circumference
6.4 Offset readings by optical reference line method
6.5 Offsets measured by electro-optical distance-ranging method
6.5.1 EODR instrument set-up
6.5.2 EODR calibration procedure
6.6 Tank bottom calibration
6.7 Other measurements and data
7 Tolerances
8 Tank capacity table calculation procedure
8.1 Outside circumference
8.2 Corrections
8.3 Tank capacity table
Annex A (informative) Tank calibration uncertainties for optical-reference-line method
Bibliography