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51313-02289-Proposal of HIC Test Solution with Buffer Capacity in NACE Standard TM0284

Picture for Proposal of HIC Test Solution with Buffer Capacity in NACE Standard TM0284
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Product Number: 51313-02289-SG
ISBN: 02289 2013 CP
Author: Takuya Hara
Publication Date: 2013
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$20.00
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Hydrogen Induced Cracking (HIC) is one of the most important properties of line pipes for sour service. The optimum evaluation methods of HIC are also important in order to select the optimal line pipes from the viewpoint of fit-for-purpose (FFP). HIC of line pipes for sour service is evaluated based on the NACE TM0284 specifications for which two solutions are applied. Solution A consists of 5% sodium chloride and 0.5% acetic acid solution saturated with H2S at a partial pressure of 0.1 MPa. Solution B consists of substitute ocean water saturated with H2S at a partial pressure of 0.1 MPa. The pH of Solution A can be acceptable in the range from 2.7 to 4.0 while that of Solution B is acceptable from 4.8 to 5.4 during the HIC test. The hydrogen content in the steel decreases with increasing pH during the HIC test. Since the HIC behavior of steels is also affected by the shift in the pH such shifting is not appropriate for HIC tests. The ISIJ HLP committee proposes a modified solution with a strong buffering capacity to maintain a constant pH during HIC tests. This paper describes the buffering effect in various buffer solutions in HIC tests as well as the hydrogen entry behavior.

Hydrogen Induced Cracking (HIC) is one of the most important properties of line pipes for sour service. The optimum evaluation methods of HIC are also important in order to select the optimal line pipes from the viewpoint of fit-for-purpose (FFP). HIC of line pipes for sour service is evaluated based on the NACE TM0284 specifications for which two solutions are applied. Solution A consists of 5% sodium chloride and 0.5% acetic acid solution saturated with H2S at a partial pressure of 0.1 MPa. Solution B consists of substitute ocean water saturated with H2S at a partial pressure of 0.1 MPa. The pH of Solution A can be acceptable in the range from 2.7 to 4.0 while that of Solution B is acceptable from 4.8 to 5.4 during the HIC test. The hydrogen content in the steel decreases with increasing pH during the HIC test. Since the HIC behavior of steels is also affected by the shift in the pH such shifting is not appropriate for HIC tests. The ISIJ HLP committee proposes a modified solution with a strong buffering capacity to maintain a constant pH during HIC tests. This paper describes the buffering effect in various buffer solutions in HIC tests as well as the hydrogen entry behavior.

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