Standard Speciﬁcation for Welded Austenitic Stainless Steel Feedwater Heater Tubes1
This general is issued underneath the ﬁxed designation a 688/a 688m; the wide variety immediately following the designation indicates the yr of unique adoption or, in the case of revision, the year of ultimate revision. Various in parentheses shows the yr of last reapproval. A superscript epsilon (e) suggests a piece of writing exchange for the reason that last revision or reapproval.
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