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Fitness-for-Purpose HIC Testing of Heavy Wall Large-Diameter Pipes for Mildly Sour Applications in the New NACE TM0284-2016 Solution C

Resistance testing of low alloyed steel pipes to Hydrogen Induced Cracking (HIC) is performed according to NACE standard TM0284. Fitness-for-purpose testing, where the appropriate environment and pressures are selected, has been included.

Product Number: 51317--8881-SG
ISBN: 8881 2017 CP
Author: Thomas Haase
Publication Date: 2017
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$20.00
$20.00

Resistance testing of low alloyed steel pipes to Hydrogen Induced Cracking (HIC) is performed

according to NACE standard TM0284. Within the latest revision of this standard in 2016, fitness-for-purpose testing, where the test environment and partial pressures of gases appropriate to the intended application are selected, has been included. Mildly sour service conditions may require testing under less severe conditions. Compared to the standard test duration of 4 days, longer test durations up to 90 days can be required in the newly added test solution C.

HIC tests have been performed for several SAWL large diameter pipes of grade X65-X80 designated for sweet or mildly sour environments at hydrogen sulfide partial pressures between 100 kPa and 0.5 kPa at different pH values between 3.3 and 5.8 in NACE TM0284 standard test solutions. For evaluation, the new ultrasonic procedure of NACE TM0284-2016 has been used as well as standard metallographic evaluation by equidistant sectioning of some specimens and determination of the CLR, CTR and CSR. Test results are compared after 4 days and the designated longer test durations. Based on the different test durations, material dependent HIC resistivity trends can be observed for the different pipe materials.

 

Key words: HIC, sour service, fitness-for-purposeoil

Resistance testing of low alloyed steel pipes to Hydrogen Induced Cracking (HIC) is performed

according to NACE standard TM0284. Within the latest revision of this standard in 2016, fitness-for-purpose testing, where the test environment and partial pressures of gases appropriate to the intended application are selected, has been included. Mildly sour service conditions may require testing under less severe conditions. Compared to the standard test duration of 4 days, longer test durations up to 90 days can be required in the newly added test solution C.

HIC tests have been performed for several SAWL large diameter pipes of grade X65-X80 designated for sweet or mildly sour environments at hydrogen sulfide partial pressures between 100 kPa and 0.5 kPa at different pH values between 3.3 and 5.8 in NACE TM0284 standard test solutions. For evaluation, the new ultrasonic procedure of NACE TM0284-2016 has been used as well as standard metallographic evaluation by equidistant sectioning of some specimens and determination of the CLR, CTR and CSR. Test results are compared after 4 days and the designated longer test durations. Based on the different test durations, material dependent HIC resistivity trends can be observed for the different pipe materials.

 

Key words: HIC, sour service, fitness-for-purposeoil

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