January 6, 2019


NACE TM – “Laboratory Testing of Metals for Resistance to Sulfide Stress Cracking and Stress Corrosion Cracking in H2S Environments”. This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. 18 Apr NACE TM Laboratory Testing of Metals for Resistance to Sulfide Stress Cracking and Stress Corrosion Cracking in H2S.

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Akin to the proof-ring, the spring-loaded stress frame shown in TM Method A naec designed nacee expose a single tensile specimen under atmospheric pressure conditions. It is also well understood that different test methods may not necessarily provide the same ranking.

Nevertheless, SSC test results can show statistical variability for the same material. When multiple specimens are tested at various stress levels, an apparent threshold stress level for the occurrence of SSC can be obtained.

The sour service environment consists of chloride containing solution saturated with H2S gas. These factors can be divided into three groups, the first one referring to specimen preparation, the second one referring to specimen loading, and the third one referring to bace set up and control of test conditions.

Some factors were identified as influencing Method A test results and are presented in the first part of this paper. Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages.


Method A test result dispersion may be linked to a wide number of factors. Login or Nade Anonymously. This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold.

Log in to your subscription Username. Data showing efficacy and applicability of the test method are provided. Several types of stressing frames may be used to nzce the test, but this paper will only focus on tests carried out with proof ring as stressing frame.

Rock Mechanics Symposium and 5th U. Some of them were spotted as critical factors towards SSC test result dispersion. Publishers Content Coverage Privacy. Proceedings of an international conference Diverless and Deepwater Techology: SSC phenomenon may occur in materials subjected to stress applied or nxce in a hydrogen sulfide H2S containing environment. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.

About us Contact us Help Terms of use. While the classic proof ring test is the epitome of the NACE Method A test for sulfide stress cracking, TM makes clear that tn0177 apparatus may be used as long as it applies known sustained stress to a tensile specimen having gage section dimensions specified by TM Method A, exposed to the relevant H2S-containing environment.

The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen. A testing device is presented in Figure 1.

Proceedings of an international conference Oceanology: The Window-box methodology also incorporates procedures to document and minimize stress relaxation and thermal expansion when testing at elevated temperatures. Order of magnitude is also quantified on different test equipment. Advanced search Show search help.


SCC Stress Corrosion Cracking Nace TM

Method A tensile test consists of uniaxial stressing of specimen up to a specified stress level below the Yield Strength. While the apparatuses illustrated in TM Method Nce were clearly designed for testing at room temperature at atmospheric pressure, TM Method A is also clear that all of these test apparatuses can be adapted to high-pressure, high-temperature HPHT applications through utilization of small individual autoclaves by testing one specimen at a time per autoclave.

Discussion on the influence of other parameters such as machining, polishing, storage of the specimens and test procedure is presented as well in order to share the experience on the NACE Method A test. Peer reviewed only Published between: An inventory gm0177 every factor which is likely to affect the Method A test results is presented on Figure 2.

Proceedings of an international conference Subsea Controls and Data Acquisition ‘ The second and third parts of this study are devoted to bending assessment in tensile test specimen stressed using proof rings. Proceedings of an International Conference Submersible Technology: