ISO 7382:2023 工業用エチレン - 液相および気相のサンプリング | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 47, Chemistry.

This second edition cancels and replaces the first edition (ISO 7382:1986), which has been technically revised.

The main changes are as follows:

• the Scope has been expanded to apply to sampling for the determination of trace polar compounds in ethylene products;
• Clauses 2 and 3 have been added;
• content from Clauses 4 and 7, including safety precaution and maintenance of sampling apparatus, has been moved elsewhere in the document;
• Clause 4, the critical pressure for ethylene has been corrected to 5,04 MPa;
• Clause 5, explanations regarding apparatus have been added;
• Clause 5, some specific parameters, including volume of sampling cylinder, size of connecting pipe and time to purge sampling cylinder, have been deleted;
• 5.2.1, specially passivated sampling apparatus has been recommended, especially when sampling for the determination of trace polar compounds in ethylene products.
• Annex A, and Figures 1, 5 and A.1 have been revised.
• 5.2.2: the procedure of purging and sampling for non-closed sampling apparatus has been revised;
• sampling apparatus -no.2 in the first edition and its procedure have been deleted and a new sampling apparatus was introduced as closed sampling apparatus no.2;
• 5.3, 5.4, 5.5, two closed-sampling apparatuses for liquefied ethylene and a sampling apparatus with heated pressure regulator have been added.
• 6.2, the connecting pipes for non-closed sampling of gaseous ethylene has been revised;
• 6.3, the closed-sampling apparatuses for gaseous ethylene has been added.

1 Scope

This document describes the procedures and the precautions to be taken in drawing representative samples of ethylene in the liquid phase stored at -100 °C and in the gaseous phase, for the purpose of their analysis.

Annex A sets out a diagrammatic representation of a system for the disposal of the portion of the sample which is not used in the analysis.

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 following terms and definitions apply.

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