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;
— in Clause 4, the critical pressure for ethylene has been corrected to 5,04 MPa;
— in Clause 5, explanations regarding apparatus have been added;
— in Clause 5, some specific parameters, including volume of sampling cylinder, size of connecting pipe and time to purge sampling cylinder, have been deleted;
— in 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.
— in 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;
— in 5.3, 5.4, 5.5, two closed-sampling apparatuses for liquefied ethylene and a sampling apparatus with heated pressure regulator have been added.
— in 6.2, the connecting pipes for non-closed sampling of gaseous ethylene has been revised;
— in 6.3, the closed-sampling apparatuses for gaseous ethylene has been added.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

BS ISO 7382:2023

Ethylene for industrial use. Sampling in the liquid and the gaseous phase

Current

Published:

31 Jul 2023