By EFC 17
A revised and up-to-date set of instructions appropriate to stainless steels, nickel alloys and titanium alloys protecting: SSC/SCC try out strategies, reference environments for SSC and SCC trying out; counsel on autoclave checking out of CRA's; tactics for checking out CRA's uncovered to sulphur and H2S.
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Additional resources for Corrosion Resistant Alloys for Oil and Gas Production: Guidance on General Requirements and Test Methods for H2S Service, 2nd Revised Edition
If the material's resistance to cracking is marginal tests which impose some active straining should be considered. It is also r e c o m m e n d e d that the SSC/SCC resistance of candidate alloys be investigated by at least one other test method. In particular: When no failures occur in nominally static tests, it may be appropriate to obtain information about the mechanical conditions that could cause cracking of the candidate material to identify its limitations in the intended service environment.
Limitations of this approach are: • the test duration m a y not be long enough to ensure correct evaluation of borderline cases where there is an extended incubation time to initiate cracking. • the use of a nominally static test load m a y not be adequate to qualify severe applications in which the material is exposed to plastic straining in service. W h e n these limitations are of concern it m a y be appropriate to use longer exposure periods or a test m e t h o d that imposes some straining.
V. Vessels (parent materials): s m o o t h tensile. vi. Vessels (welds): four point b e n d and s m o o t h tensile. 5 Test D u r a t i o n a n d Strain Rate The r e c o m m e n d e d m i n i m u m d u r a t i o n of all constant load a n d constant total strain tests is 720 h. The r e c o m m e n d e d strain rate for use in slow strain rate tests is i x 10 -6 s -1. This rate is an e x p e r i m e n t a l l y acceptable c o m p r o m i s e ; at h i g h e r rates m e c h a n i c a l effects p r e d o m i n a t e and susceptibility to SSC/SCC m a y be missed, while at lower rates the time required for each test becomes excessive.