GB/T 42904-2023Corrosion of metals and alloys—Corrosion test of flowing water in seawater pipeline (English PDF)

Foreword

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

1 Scope

This document specifies the test method for dynamic water corrosion of pipelines simulated by controlling flow rate and temperature in natural seawater or artificial seawater.

This document is applicable to pipeline dynamic water corrosion tests on plate specimens, tubular specimens and pipe fittings in natural seawater or artificial seawater.

2 Normative reference documents

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

GB/T 10123 Corrosion terminology for metals and alloys

GB/T 17378.4 Marine Monitoring Specifications Part 4: Seawater Analysis

GB/T 18590 Corrosion pitting assessment method for metals and alloys

3 Terms and definitions

The terms and definitions defined in GB/T 10123 apply to this document.

4 Requirements for natural seawater test site

The main conditions that a natural seawater pipeline dynamic water corrosion test site should have are.

a) The test site has a typical natural seawater environment;

b) The water quality of the test site is clean and pollution-free, except when studying corrosion caused by pollution;

c) The test site has necessary protection measures;

d) Detailed information on the seawater environmental factors of the test site, such as water temperature, salinity, conductivity, pH value, oxygen content, sediment content, Changes in water level, seawater tides and current speeds, etc.;

e) Regularly measure the water environment parameters of the test site. The measurement method shall refer to GB/T 17378.4.

5 Test facilities and instruments