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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Advanced search Show search help. Proceedings of an international conference Oceanology: Nsce 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.
This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold.
The Window-box methodology also incorporates procedures to document and minimize stress relaxation and thermal expansion when testing at elevated temperatures.
Proceedings of an international conference Diverless and Deepwater Techology: 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.
Order of magnitude is also quantified on different test equipment. Method A tensile test consists of uniaxial stressing of specimen up to a specified stress level below the Yield Strength. Some factors were identified as influencing Method A test results and are presented in the first part of hace paper. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.
An inventory of every factor which is likely to affect the Method A test results is presented on Figure 2. Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages. It is also well understood that different test methods may not necessarily provide the same ranking.
Nevertheless, SSC test results can ance statistical variability for the same material. 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. Proceedings of an International Conference Submersible Technology: 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.
When multiple specimens are tested at various stress levels, an apparent threshold stress nacce for the occurrence of SSC can be obtained.
Log in to your subscription Username. Peer reviewed only Published between: Publishers Content Coverage Privacy. Data showing efficacy and applicability of the test method are provided.
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.
Some of them were naace as critical factors towards SSC test result dispersion.
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. The sour service environment consists of chloride containing solution saturated with H2S gas. Method A test result dispersion may be linked to a wide number of factors. The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen. 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.
A testing device is presented in Figure 1.