This work proposes a method to test flexible pipe carcass samples by Sulfide Stress Cracking (SSC) C-Ring test. As flexible pipes are going to be used on the majority of new deep water oil & gas offshore fields and at most of pre-salt fields in Brazil where the conditions are sour or can eventually became sour due to H2S presence, SSC may occur. Therefore, a method to test SSC on samples made from flexible pipes is very important. In this context, the NACE Standard TM 01771, method C (C-Ring) test is presented as a good alternative to evaluate these components. However, the method as it is described in the standard does not contemplate the carcass geometry. The experimental procedure presented herein follows the standard NACE TM 0177 and proposes, in addition, a finite element simulation to find the main direction of applied stresses and also the use of a rosette strain gauge instead of the uniaxial one recommended in the standard. Reproducible results were obtained on loads performed following the procedure presented in this paper.

Subject
Materials, Piping, Modeling, Geometry, Gauges, C ring stress corrosion testing, Fluids, 3D modeling, Elements, Sulfide stress cracking, Elastic limit, Yield strength, Samples
Keywords:
C-ring test, NACE TM 0177, Flexible pipes carcass
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2013
Association for Materials Protection and Performance (AMPP)
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