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08099 New Limits for Sulfide Stress Cracking in Deep Water Applications

Product Number: 51300-08099-SG
ISBN: 08099 2008 CP
Author: Russell D. Kane and Pilar Quiroga
Publication Date: 2008
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$20.00
$20.00
A series of tests were conducted on commercially produced bar stock for three commonly used alloys in the size range 2.0 to 2.5 inch (51 to 64 mm) to evaluate serviceability limits in sour (H2S containing) production environments with the goal to extend these limits in NACE MR0175/ISO15156. UNS S17400 was found to be highly susceptible to SSC. SSC was observed under all three environmental conditions used in this project to a minimum severity condition of 0.15 psia (1 kPa) H2S, 30,000 ppm chloride, and pH 5.0 at 75 F (23 C). Serviceability limits were identified for UNS S31600. In the initial test series the maximum use limits were 1.5 psia (10 kPa) H2S, 5,000 ppm chloride, pH 5.0, 200 F (93 C). In a second set of tests, additional limits were defined that consisted of 1.5 (10 kPa) psia H2S, 1,000 ppm chloride, pH 4.0, and 300 F (149 C). Serviceability limits were identified for UNS N05500. Based on the three test conditions used in this project, No failures were observed at 100 psia (689 kPa) H2S, 50,000 ppm chloride, pH 3.5, 75, with steel couple. No ballot was prepared for UNS S17400.
A series of tests were conducted on commercially produced bar stock for three commonly used alloys in the size range 2.0 to 2.5 inch (51 to 64 mm) to evaluate serviceability limits in sour (H2S containing) production environments with the goal to extend these limits in NACE MR0175/ISO15156. UNS S17400 was found to be highly susceptible to SSC. SSC was observed under all three environmental conditions used in this project to a minimum severity condition of 0.15 psia (1 kPa) H2S, 30,000 ppm chloride, and pH 5.0 at 75 F (23 C). Serviceability limits were identified for UNS S31600. In the initial test series the maximum use limits were 1.5 psia (10 kPa) H2S, 5,000 ppm chloride, pH 5.0, 200 F (93 C). In a second set of tests, additional limits were defined that consisted of 1.5 (10 kPa) psia H2S, 1,000 ppm chloride, pH 4.0, and 300 F (149 C). Serviceability limits were identified for UNS N05500. Based on the three test conditions used in this project, No failures were observed at 100 psia (689 kPa) H2S, 50,000 ppm chloride, pH 3.5, 75, with steel couple. No ballot was prepared for UNS S17400.
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