A revised and updated set of guidelines applicable to stainless steels, nickel alloys and titanium alloys covering: SSC/SCC test procedures, reference environments for SSC and SCC testing; guidance on autoclave testing of CRA's; procedures for testing CRA's exposed to sulphur and H2S.
The work group consider this revision of EFC 17 necessary to incorporate
developments, in the testing of CRAs, made since publication of the first edition in
1995. In particular:
1. Experience with weldable super-martensitic stainless steels has identified that
artificially buffered test solutions used for SSC testing require modification for
these steels
2. More general improvements in the definition of test solutions have been made in
co-operation with ISO/TC 67/WG 7 during the preparation of ISO 15156.
The above have been incorporated as changes to Section 8 and Appendix 4.
Elsewhere, minor changes have been made to update and correct editorial errors and
omissions in the original text.
In addition to the changes now made to this document, the reader's attention is
drawn to:
1. Continuing development of ISO 15156 by ISO/TC67/WG 7.
2. Extensive proposed changes to the CRA content of NACE MR0175 and the
intended carry-over of these changes into ISO 15156.
3. Incorporation of SCC testing requirements in the 1996 revision of NACE TM0177
and changes to test solutions now in preparation for the next edition. The latter
are expected to be largely consistent with this document.
4. Publication of ISO 13680:2000 that defines 'technical delivery conditions' for CRA
OCTG not previously covered by API 5CT (ISO 11960).
We wish to acknowledge the essential contributions of Work Group members to
this revision and the following who have assisted with the editorial preparation of
the revision: J.-L. Crolet, E. Wade, B. Kermani.
As foreseen in the first edition, developments in the testing of CRAs continue.
Readers are encouraged to minitor these to ensure their use of best practice.
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