Standard Speciﬁcation for Carbon Steel Forgings, for General-Purpose Piping1
This widespread is issued below the ﬁxed designation a 181/a 181m; the quantity straight away following the designation indicates the year of unique adoption or, inside the case of revision, the 12 months of ultimate revision. a number of in parentheses shows the yr of closing reapproval. a superscript epsilon (e) shows an editorial alternate since the remaining revision or reapproval.
This preferred has been accredited for use by means of groups of the department of protection
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click here to download A 179M – 90a (Reapproved 2001) pdf free