Designation: A 53/A 53M – 012
An American National Standard
Standard Speciﬁcation for
Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
This standard is issued under the ﬁxed designation A 53/A 53M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (
) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope *
1.1 This speciﬁcation
covers seamless and welded black and hot-dipped galvanized steel pipe in NPS
to NPS 26 [DN 6 to
DN 650] (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 and Table X2.3. It shall be permissible
to furnish pipe having other dimensions (Note 2) provided such pipe complies with all other requirements of this speciﬁcation.
1—The dimensionless designators NPS (nominal pipe size) [DN (diameter nominal)] have been substituted in this speciﬁcation for such
traditional terms as “nominal diameter,” “size,” and “nominal size.”
2—The term nominal wall thickness has been assigned for the purpose of convenient designation, existing in name only, and is used to distinguish
it from the actual wall thickness, which may vary over or under the nominal wall thickness.
1.2 This speciﬁcation covers the following types and grades:
—Furnace-butt welded, continuous welded Grade A,
—Electric-resistance welded, Grades A and B, and
—Seamless, Grades A and B.
3—See Appendix X1 for deﬁnitions of types of pipe.
1.3 Pipe ordered under this speciﬁcation is intended for mechanical and pressure applications and is also acceptable for ordinary
uses in steam, water, gas, and air lines. It is suitable for welding, and suitable for forming operations involving coiling, bending,
and ﬂanging, subject to the following qualiﬁcations:
1.3.1 Type F is not intended for ﬂanging.
1.3.2 When Types S and E are required for close coiling or cold bending, Grade A is the preferred grade. This provision is not
intended to prohibit the cold bending of Grade B pipe.
1.3.3 Type E is furnished either nonexpanded or cold expanded at the option of the manufacturer.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.5 The following precautionary caveat pertains only to the test method portion, Sections 9, 10, 11, 15, 16, and 17 of this
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the