ASTM F3372-20

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: F3372 − 20 An American National Standard
Standard Practice for
1
Butt Fusion Joining of PA12 Pipe and Fittings
This standard is issued under the fixed designation F3372; 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.
1. Scope 1.6 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
1.1 This practice describes procedures for making butt
conversions to SI units that are provided for information only
fusion joints with Polyamide 12 (PA12) pipe and fittings by
and are not considered standard.
means of heat fusion joining in, but not limited to, a field
1.6.1 Non-conformance with this specification is possible if
environment.ProcedureAisforenvironmentaltemperaturesof
values from the two systems are combined. Values in paren-
40 °F (4 °C) and higher. Procedure B is for site temperatures
theses are conversions that are appropriately rounded for
below 40 °F (4 °C). Other suitable heat fusion joining proce-
accuracy and precision; that are not exact equivalents, and that
dures are available from various sources including pipe and
are for non-mandatory informational purposes.
fittingmanufacturers.Thisstandarddoesnotpurporttoaddress
1.7 This standard does not purport to address all of the
all possible heat fusion joining procedures, or to preclude the
safety concerns, if any, associated with its use. It is the
use of qualified procedures developed by other parties that
responsibility of the user of this standard to establish appro-
have been proved to produce reliable heat fusion joints.
priate safety, health, and environmental practices and deter-
1.2 The parameters and procedures are applicable only to
mine the applicability of regulatory limitations prior to use.
joining PA12 pipe and fittings and are not applicable to other
1.8 This international standard was developed in accor-
polyamide types. They are intended only for PA12 fuel gas
dance with internationally recognized principles on standard-
pipe per Specification F2785 and PA12 butt heat fusion fittings
ization established in the Decision on Principles for the
in accordance with Specification F1733. Fusion to other
Development of International Standards, Guides and Recom-
polyamide types (that is, cross-fusion) is not permitted under
mendations issued by the World Trade Organization Technical
this practice, and this practice does not not apply to other
Barriers to Trade (TBT) Committee.
polyamide types. Consult with the pipe and fittings manufac-
turerstomakesuretheyrecommendthisprocedureforthepipe
2. Referenced Documents
and fittings to be joined (also see Appendix X1).
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2.1 ASTM Standards:
1.3 The procedures in this practice apply to the butt fusion
F412 Terminology Relating to Plastic Piping Systems
of PA12 pipe and butt fusion fittings in accordance with 1.2
F1733 Specification for Butt Heat Fusion Polyamide(PA)
having like diameter and wall thickness.
Plastic Fitting for Polyamide(PA) Plastic Pipe and Tubing
NOTE 1—Refer to X1.5 for guidance regarding dissimilar wall thick- F2785 Specification for Polyamide 12 Gas Pressure Pipe,
nesses.
Tubing, and Fittings
1.4 Other suitable heat joining procedures are available
3. Terminology
from various sources including pipe and fitting manufacturers.
Melt characteristics, average molecular weight and molecular
3.1 General—Definitions and abbreviations are in accor-
weight distribution of PA12 compounds are influential factors
dance with Terminology F412, unless otherwise specified.
in establishing suitable fusion parameters; therefore, consider
3.2 Definitions of Terms Specific to This Standard:
the manufacturer’s recommendations in the use or develop-
3.2.1 drag force, n—the force required to overcome the
ment of a specific fusion procedure.
static and dynamic resistance to motion of the movable
1.5 The text of this practice references notes, footnotes, and
carriage.
appendixes which provide explanatory material. These notes
3.2.2 fusion force, n—the force applied between the melted
and footnotes (excluding those in tables and figures) shall not
polymer pipe ends.
be considered as requirements of the practice.
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This test method is under the jurisdiction of ASTM Committee F17 on Plastic For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Piping Systems and is the direct responsibility of Subcommittee F17.20 on Joining. contact ASTM Customer Service at service@astm.org. F
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