GB/T 41755-2022Determination of the susceptibility to cracking of line pipe in sour service—Full ring ovalization test 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 of Standardization Documents" drafted.

1 Scope

This document specifies the use of a complete pipe section sample to test pipeline steel in an acidic environment (a low pH aqueous solution containing H2S) Test method for susceptibility to cracking in medium.

This document applies to the cracking susceptibility of seamless, longitudinally welded, spirally welded or girth welded pipes in sour environments.

2 Normative references

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

GB/T 4157-2017 Laboratory test method for resistance of metals to sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environment

GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories

GB/T 8923.1-2011 Visual assessment of surface cleanliness of steel surface treatment before application of paint - Part 1: Uncoated The rust grade and treatment grade of the steel surface and the steel surface after comprehensive removal of the original coating

NB/T 47013.3 Nondestructive Testing of Pressure Equipment Part 3: Ultrasonic Testing

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Reagents

4.1 The purity of the test gas H2S should be greater than 99.9%.

4.2 Nitrogen, argon or other suitable gas with a purity of not less than 99.998% should be used, which will not react chemically with the reagent (or test solution).