GB/T 3396-2022Determination of trace oxygen in ethylene and propylene for industrial use—Electrochemical method (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 3396-2002 "Electrochemical method for the determination of trace oxygen in industrial ethylene and propylene". Compared with GB/T 3396-2002, except for structural adjustment and editorial changes, the main technical changes are as follows.

a) Changed the range, added online analysis, and changed the measurement range of offline analysis (see Chapter 1, Chapter 1 of the 2002 edition);

b) The principle has been changed, and the total reaction equation of the galvanic cell in the electrochemical method of the membrane-covered galvanic cell has been deleted (see Chapter 4, 2002 edition Chapter 3);

c) A flash gasification unit is added (see 5.2.6, 5.4.1.3);

d) Added requirements for sampling cylinders (see 5.2.7);

e) Changed Figure 1, Figure 2, Figure 3 and Figure 4 (see Figure 1, Figure 2, Figure 3 and Figure 4, Figure 1, Figure 2, Figure 3 and Figure 4 of the 2002 edition);

f) Added online analysis (see Chapter 1 and Chapter 6);

g) Increased quality control (see Chapter 7).

Warning

This document is not intended to address all safety issues related to its use. It is the user's responsibility to take appropriate safety and health measures to ensure compliance with relevant national laws and regulations.

1 Scope

This document describes the off-line, electrochemical and electrolytic electrochemical methods of membrane-covered cells and the online analysis method for the determination of trace oxygen in gaseous ethylene or propylene.

The off-line analysis of this document is suitable for the determination of trace molecular oxygen in industrial ethylene and propylene with a content not less than 0.5mL/m3; on-line analysis is suitable for It is used to determine trace molecular oxygen in industrial ethylene and propylene whose content is not less than 0.1mL/m3.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 3723 General Rules for Sampling Safety of Industrial Chemical Products

GB/T 3836 (all parts) Explosive atmospheres

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 8170 Numerical rounding off rules and expression and determination of limit values

GB/T 13289 Industrial Ethylene Liquid and Gas Sampling Method

GB/T 13290 Industrial Propylene and Butadiene Liquid Sampling Method

GB/T 34042 General Specifications for On-line Analytical Instrument Systems

GB 50058 Code for Design of Power Installations in Explosive Hazardous Atmospheres

JJG 945 Verification Regulations for Trace Oxygen Analyzer

SH/T 3081 Petrochemical Instrument Grounding Design Code

SH/T 3082 Specifications for design of power supply for petrochemical instruments

SH/T 3097 Code for design of static grounding in petrochemical industry

SH/T 3174 Petrochemical On-line Analyzer System Design Specifications

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Principles