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WI2318a API Research on DCB testing of C110

WI2318a API Research on DCB testing of C110. DCB Testing of C-110 in Standard and Mild Conditions For Determination of Klimit WI TARGETS 1/ Define correct procedure of DCB testing 2/ Define acceptance criteria for compliance aspect (WI2348)

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WI2318a API Research on DCB testing of C110

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  1. WI2318a API Research on DCB testing of C110 DCB Testing of C-110 in Standard and Mild Conditions For Determination of Klimit WI TARGETS 1/ Define correct procedure of DCB testing 2/ Define acceptance criteria for compliance aspect (WI2348) 3/ Define threshold of K1SSC for C110 in mild sour environment to resolve informative SR39

  2. ReminderfromJanuary 2012 meeting

  3. WI2318a API Research on DCB testing of C110 • New Plan for 2013-2014 study at OMNI (budget 180 kUSD) 5 commercial pipes donated from 3 vendors

  4. WI2318a API Research on DCB testing of C110

  5. DCB Testing • New specimen design (crack tip matches base of chevron). • Careful preparation & HRC testing (6 readings per specimen). • 3 arm displacements with 4 specimens per displacement. • New bath time for mild tests (17 days in bath, no 3-day hold). • Each group of 4 divided between two tanks. • H2S analyses: Standard: Tank 1: 2812 ppm Tank 2: 2796 ppm Mild: Tank 1: 183 ppm Tank 2: 189 ppm

  6. DCB Testing (cont.) • Avg. temperatures of all 4 vessels within 0.3 °F of standard 75 °F. • Mild test liftoffs all within 2 hours. • Tests inspected for validity: # of Invalid Tests Defect Mild Standard Short or No Crack 2 2 Edge Cracks 2 17 Non-Planar 0 1

  7. Standard Conditions, Pipe Averages Std. 0.020” (0.51mm) Arm Displacement API Minimum

  8. Mild Conditions, Pipe Averages API Std. 0.035” (0.89mm) Arm Displacement

  9. Mild & Standard Conditions, Pipe Averages API Minimum

  10. Rank Standard Mild B C D A E A D B E C

  11. WI2318a API Research on DCB testing of C110

  12. WI2318a API Research on DCB testing of C110 Action for January2014 review Need to implementsome (20/120) retestsfrom step1 Activate step2 for HRC effectfrom ring E & step3 for T° effect

  13. WI2318a API Research on DCB testing of C110 • New Plan for 2013-2014 study at OMNI (budget 180 kUSD) 5 commercial pipes donated from 3 vendors

  14. Study on C110 Kissc & Klimit in Weak H2S Solutions • USS work from Jan 2012 • comprehensive presentation “Studies on C110 Critical Stress Intensity Factor (K1ssc) in Weak H2S Solution” illustrating in particular the non linear relation of K1ssc vs H2S partial pressure and same for K1ssc vs arm displacement within various mild environments. • + update june 2013 • K1ssc & Klimit = a ln [H2S] +b • High [H2S] => solution is governing • Low [H2S] => microstructure is governing

  15. DCB Data C110 -Heat #2 United States Steel Corporation

  16. K limit in 7.0% H2S Solution NACE A sln 32 ksi in-2 31 ksi in-2 United States Steel Corporation

  17. K limit in 99.5% H2S Solution NACE A sln 24.7 ksi in-2 24 ksi in-2

  18. Klimit In Various H2S Solutions (NACE A sln) K limit approximately follows a power law relationship with H2S concentration, which is similar to the trend of KISSC as seen in Slides 7 & 8

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