Standard Speciﬁcation for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over)
This fashionable is issued beneath the ﬁxed designation a 139/a 139m; the wide variety right now following the designation indicates the year of unique adoption or, within the case of revision, the year of ultimate revision. a variety of in parentheses indicates the yr of last reapproval. a superscript epsilon (e) suggests a piece of writing trade for the reason that closing revision or reapproval.
this trendy has been accepted for use by way of agencies of the department of defense.
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