ASTM F3525/F3525M-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F3525/F3525M −21 An American National Standard
Standard Specification
1
Fabricated Fittings of Crosslinkable Polyethylene (CX-PE)
ThisstandardisissuedunderthefixeddesignationF3525/F3525M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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.
or tubing create a similar condition.
1. Scope
1.1 This specification establishes requirements for fabri- 1.5 Design of fabricated fittings is outside of the scope of
this standard. Requirements related to thicknesses and taper
cated fittings intended for use with outside-diameter controlled
CX-PE pipe and tubing. These fittings are manufactured by angles are intended to differentiate potentially good, fabricated
fittings from fittings with a high risk of failure. Users of the
heat-fusion joining shape-modified CX-PE components pre-
pared from pipe, molded fittings, sheet, billet, or block. standard are advised that for large or made-to-order fittings,
minimal testing is required by this standard, and it may be
Included are requirements for materials, design, workmanship,
minimum dimensions, marking, test methods, and quality insufficient itself to identify improperly designed and produced
fittings made in accordance with this standard. The design and
control.
production of fittings made in accordance with this standard
1.2 Pressure rating of the fabricated-fitting design is beyond
shall be performed by a fabricator with appropriate training,
the scope of this standard and shall be established by the fitting
equipment and knowledge of fitting design and production.
manufacturer.
1.6 Pipe used to fabricate fittings in accordance with this
1.3 Fittings manufactured in accordance with this specifica-
specification shall be produced in accordance with pipe manu-
tion are primarily intended to be joined to CX-PE pipes and
facturer specifications.
used in CX-PE piping systems that are commissioned in
accordance with a pipe manufacturer recommended commis-
1.7 The text of this specification references notes and
sioning practice. In addition, fittings manufactured in accor-
footnotes which provide explanatory material. These notes and
dance with this specification that are ≥65 % crosslinked prior
footnotes (excluding those in tables and figures) shall not be
to installation can meet the additional requirements of Speci-
considered as requirements of the standard.
fication F2829.
1.8 The values stated in either SI units or inch-pound units
1.4 The pressure rating determined for a fitting will result in
are to be regarded separately as standard. The values stated in
the fittings’ equivalent dimension ratio (EDR). The EDR
each system may not be exact equivalents; therefore, each
specified by the fitting manufacturer is the DR of the piping
system shall be used independently of the other. Non-
system for which the fabricated fitting is intended to be joined.
conformance with this practice is possible if values from the
This standard specifies that fittings be fabricated from pipe
two systems are combined. Values in parentheses are conver-
sections of a lower DR than pipe that the fabricated fitting is
sions that are appropriately rounded for accuracy and preci-
intended to be joined to. This standard follows the pattern of
sion; that are not exact equivalents, and that are for non-
Specification F2206 which specifies that the wall thickness of
mandatory informational purposes.
fabricated multiple segment elbow fittings shall be a minimum
1.9 The following safety hazards caveat pertains only to the
of 22 % more than the pipe to be joined to for example.
pressure test requirements 6.3 of this specification. This stan-
NOTE 1—Increased wall thickness alone is not necessarily sufficient to
dard does not purport to address all of the safety concerns, if
produce fittings adequate for use. Increased wall thickness without
any, associated with its use. It is the responsibility of the user
consideration of proper material placement can be detrimental to perfor-
of this standard to establish appropriate safety, health, and
mance. Finite element analysis studies have shown that abrupt changes in
fitting wall sections, such as between a heavy socket hub and body wall, environmental practices and determine the applicability of
concentrates stress at the transition point. Normal stresses from flex,
regulatory limitations prior to use.
pressure, expansion, and contraction in a plastic piping system can break
1.10 This international standard was developed in accor-
a fitting
...