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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Proceedings of an International Conference Submersible Technology: Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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.

Method A test result dispersion may be linked to a wide number of factors. Method A tensile test consists of uniaxial stressing of specimen up to a specified stress level below the Yield Strength.

Advanced search Show search help. The sour service environment consists of chloride containing solution saturated with H2S gas. Akin to the proof-ring, the spring-loaded stress frame shown in TM Method A is designed to expose a single tensile specimen under atmospheric pressure conditions.

Some of them were spotted as critical factors towards SSC test result dispersion. Proceedings of an international conference Diverless and Deepwater Techology: The Window-box methodology also incorporates procedures to document and minimize stress relaxation and thermal expansion when testing at elevated temperatures.


Nevertheless, SSC test results can show statistical variability for the same nacd.

Rock Mechanics Symposium and 5th U. 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 test set up and control of test conditions.

SCC (Stress Corrosion Cracking Test)

Log in to your subscription Username. Several types of stressing frames may be used to perform the test, but this paper will only focus on tests carried out with proof ring as stressing frame. Order of magnitude is also quantified on different test equipment. Proceedings of an international conference Oceanology: SSC phenomenon may occur in materials subjected to stress applied or residual in a hydrogen sulfide H2S containing environment.

Data showing efficacy and applicability of the test method are provided. An inventory of every factor which is likely to affect the Method A test results is presented on Figure 2. Publishers Content Coverage Privacy. Login or Vote Anonymously. The second and third parts of this study are devoted to bending assessment in tensile test specimen stressed using proof rings.

SCC Stress Corrosion Cracking Nace TM

While the apparatuses illustrated in TM Method A 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.


When multiple specimens are tested at various stress levels, an apparent threshold naace level for the occurrence of SSC can be obtained. Some factors were identified as influencing Method A test results and are presented in the first part of this paper.

The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen.

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About us Contact us Help Terms of use. Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. It is also well understood that different test methods may not necessarily provide the same ranking. A testing device is presented in Figure 1.

Peer reviewed only Published between: This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold. While the classic proof ring test is the epitome of the NACE Method A test for sulfide stress cracking, TM makes clear that any 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.