ISO 4266-2:2023 石油および液体石油製品 | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 28 Petroleum and related products, fuels and lubricants from natural or synthetic sources, Subcommittee SC 2, Measurement of petroleum and related products.

This second edition cancels and replaces the first edition (ISO 4266-2:2002), which has been technically revised.

The main changes are as follows:

• Clause 2, the reference to ISO 8697 has been removed as it is a withdrawn document;
• 4.2.7, it has been clarified that the tank level should be measured and recorded simultaneously with the temperature;
• 7.4.4.1, it has been clarified regarding the procedure prior to making adjustments against manual measurements;
• added addition documents in Bibliography.

Introduction

Marine automatic level gauges (ALGs) are not normally used in fiscal or custody transfer applications because of the limitations described in Annexes A and B. However, level measurement by marine ALGs may be used in fiscal or custody transfer when no other alternative, reliable measurement is available. The use of marine-vessel-based ALGs in fiscal or custody transfer normally requires mutual contractual agreement between the buyer and the seller and can be subject to government regulations.

1 Scope

This document gives guidance on the accuracy, installation, calibration and verification of automatic level gauges (ALGs), both intrusive and non-intrusive, for measuring the level of petroleum and liquid petroleum products having a Reid vapour pressure less than 100 kPa, transported aboard marine vessels (i.e. tankers and barges).

This document gives guidance for buyers and sellers who mutually agree to use marine ALGs for either fiscal and/or custody transfer applications.

This document is not applicable to the measurement of level in refrigerated cargo tanks.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1998-1, ISO 1998-2, ISO 1998-3, ISO 1998-4, ISO 1998-5, ISO 1998-6, ISO 1998-7, ISO 1998-99 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography