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Pipe Burst Pressure Estimation in Sour Environment using Constant Load Fracture Toughness Tests

Sulfide stress cracking has special importance in the Oil and Gas (O&G) industry due to the considerable amount of hydrogen sulfide that may be present in the processed fluids. Furthermore the increasing interest of the O&G industry on high grade tubulars to work at high pressure make of the sulfide stress cracking phenomenon an important issue in the safe operational conditions assessment of Oil country Tubular Goods (OCTG).Consequently the adequate determination of fracture toughness value (i.e.: K-mat) is of fundamental importance for fitness for purpose evaluation. Particularly the fracture toughness of OCTG materials in aggressive media is usually determined using DCB specimens and the obtained K-limit values are the employed for fracture assessment. Although Method D using DCB specimens has been and is the recognized testing methodology for QA/QC purposes in pipes manufacturing  its validity as a fracture resistance parameter for burst pressure estimation of flawed pipes (FAD) remains uncertain and therefore alternative methods are being assessed.In the present paper an experimental program is described on C110 and T95 materials testedin aggressive environments. K-limit from conventional DCB tests and K-threshold from SENT specimens under constant loading are compared and discussed. The K-mat obtained from both testing techniques are employed to calculate the burst pressure of flawed pipes using API 579 equations and compared against the failure pressure from API PRAC III full scale test result (Work Group 2315). The presented results and discussion allow to incorporate a further insight on an alternative testing method and specimens geometry for brittle burst assessment of flawed pipes in an aggressive media.

Product Number: 51319-13022-SG
Author: Sebastian Cravero
Publication Date: 2019
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