NF ISO 3845

NF ISO 3845

May 2024
Standard Current

Oil and gas industries including lower carbon energy - Full ring ovalization test method for the evaluation of the cracking resistance of steel line pipe in sour service

This document gives a method for determining the resistance to cracking of steel pipes in sour service.This test method employs a full-scale test specimen consisting of a short length of pipe (a ‘full ring’), sealed at each end to contain the sour test environment within. The test method applies to any pipe; seamless, longitudinally welded (with or without filler), helical welded, and to girth welds between pipes.NOTE 1       The specimen is usually a pipe but can also consist of flange neck or section of a bend, or other tubular component or a combination of the above.NOTE 2       This test method can also be used for corrosion resistant alloys (CRAs).The method utilizes ovalization by mechanical loading to produce a circumferential stress, equal to the target hoop stress, at two diametrically opposite locations on the inside surface of the test specimen. The test specimen is then subjected to single sided exposure to the sour test environment.NOTE 3       The test also allows measurement of hydrogen permeation rates.

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Main informations

Collections

National standards and national normative documents

Publication date

May 2024

Number of pages

64 p.

Reference

NF ISO 3845

ICS Codes

75.200   Petroleum products and natural gas handling equipment

Classification index

M87-315

Print number

1

International kinship

ISO 3845:2024
Sumary
Oil and gas industries including lower carbon energy - Full ring ovalization test method for the evaluation of the cracking resistance of steel line pipe in sour service

This document gives a method for determining the resistance to cracking of steel pipes in sour service.

This test method employs a full-scale test specimen consisting of a short length of pipe (a ‘full ring’), sealed at each end to contain the sour test environment within. The test method applies to any pipe; seamless, longitudinally welded (with or without filler), helical welded, and to girth welds between pipes.

NOTE 1       The specimen is usually a pipe but can also consist of flange neck or section of a bend, or other tubular component or a combination of the above.

NOTE 2       This test method can also be used for corrosion resistant alloys (CRAs).

The method utilizes ovalization by mechanical loading to produce a circumferential stress, equal to the target hoop stress, at two diametrically opposite locations on the inside surface of the test specimen. The test specimen is then subjected to single sided exposure to the sour test environment.

NOTE 3       The test also allows measurement of hydrogen permeation rates.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles et abréviations
  • 5 Principe
  • 6 Réactifs
  • 7 Appareillage
  • 8 Échantillonnage
  • 9 Procédure
  • 10 Rapport d'essai
  • Annexe A Contrôles par ultrasons (UT)
  • Annexe B Installation de la jauge de déformation
  • Annexe C Analyse de la solution d'essai - Procédure de titrage iodométrique
  • Annexe D Summary of the full ring test procedure
  • Annexe E Examples of types of cracking
  • Annexe F Example of full ring test report and loading report
  • Annexe G Guidance on acceptance criteria
  • Bibliographie
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