NACE TM0284

Abstract

<strong>General</strong> <br>This standard establishes a test method for evaluating the resistance of pipeline and pressure vessel steels to HIC caused by hydrogen absorption from aqueous sulfide corrosion. <br>Details are provided on the size, number, location, and orientation of test specimens to be taken from each steel product form&#8212;pipes, plates, fittings, and flanges. <br>Special procedures or requirements for testing small-diameter (nominal diameter [DN] 50 through 150, nominal pipe size [NPS] 2 through 6), thin-wall (up to 6 mm [0.2 in] wall thickness), electric-resistance welded (ERW) and seamless pipes are included. The test specimens taken from small-diameter, thin-wall pipes shall be tested in the same manner as the test specimens taken from other pipes except as otherwise stated in this standard. <br>The test method consists of exposing unstressed test specimens to one of the two standard test solutions&#8212;Test Solution A, a solution consisting of sodium chloride (NaCl) and acetic acid (CH₃COOH) dissolved in distilled or deionized water saturated with H₂S at ambient temperature and pressure; or Test Solution B, a synthetic seawater solution saturated with H₂S at ambient temperature and pressure. After a specified time the test specimens are removed and evaluated. <br>The test method is not intended to duplicate service conditions. It is intended to provide reproducible test environments capable of distinguishing the susceptibility of different steel samples to HIC in a relatively short time.NOTE: The length of the test may not be sufficient to develop maximum cracking in any given steel, but has been found to be adequate for the purpose of this test. <br>This standard does not include acceptance or rejection criteria; however, guidance is provided in NACE MR0175/ISO(1) 15156,5 Part 2, Section 8 and Annex B of EFC⁽²⁾ 16.⁶ <br>(1) International Organization for Standardization (ISO), 1 ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland. <br>(2) European Federation of Corrosion, 1 Carlton House Terrace, London, SW1Y 5DB, U.K. <br>(3) ASTM International (ASTM), 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959. <br>(5) Occupational Safety and Health Administration (OSHA), 200 Constitution Ave. NW, Washington, DC 20210. <br>(6) American Chemistry Council (ACC) (formerly known as the Manufacturing Chemists Association and then as the Chemical Manufacturers Association), 700 Second St. NE, Washington, DC 20002.