ASTM F2176-17

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Designation: F2176 − 02 (Reapproved 2009) F2176 − 17 An American National Standard
Standard Specification for
Mechanical Couplings Used on Polyethylene Conduit, Duct
and Innerduct
This standard is issued under the fixed designation F2176; 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 Scope*
1.1 This specification establishes requirements for material, performance, workmanship and test methods for the qualification
of 2 in. and smaller mechanical couplings that connect to DR 15.5 and lower SDR 13.5, DR 15.5, Schedule 40 and Schedule 80
polyethylene conduit, duct and innerduct covered by Specification F2160. Throughout this standard, “conduit” refers to “conduit,
duct or innerduct” manufactured in accordance with Specification F2160.
NOTE 1—F2176 fittings are not applicable to True-sized and ID-controlled conduit per F2160.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The couplings covered by this specification are typically designed to join between conduit ends (in-line coupling). The same
coupling-to-conduit joint design may be used as a part of other coupling joint designs that telescope, or connect to bulkheads, or
other adapter fitting designs. The requirements of this standard apply only to the coupling-to-conduit joint design. The performance
requirements of other coupling joint designs are not a part of this standard.
1.4 The following safety hazards caveat pertains only to the test methods portion, Section 9 of this specification.The following
safety hazards caveat pertains only to the test methods portion, Section 9 of this specification.This standard does not purport to
address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish
appropriate safety safety, health, and healthenvironmental practices and determine the applicability of regulatory requirement-
slimitations prior to use.
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D638 Test Method for Tensile Properties of Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2444 Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling
Weight)
F412 Terminology Relating to Plastic Piping Systems
F2160 Specification for Solid Wall High Density Polyethylene (HDPE) Conduit Based on Controlled Outside Diameter (OD)
3. Terminology
3.1 Definitions are in accordance with Terminology F412 and abbreviations are in accordance with Terminology D1600, unless
otherwise specified.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 coupling joint, n—the connection between the coupling and a conduit end.
3.2.2 duct, n—a conduit (see Terminology F412, conduit).
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.
Current edition approved March 1, 2009Sept. 1, 2017. Published March 2009September 2017. Originally approved 2002. Last previous edition approved in 20022009 as
F2176F2176–02(2009).–02. DOI: 10.1520/F2176-02R09.10.1520/F2176-17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2176 − 17
3.2.3 inline mechanical couplings, n—a device used to join two conduit ends.
3.2.4 innerduct, n—a conduit installed inside a conduit.
4. Materials and Manufacture
4.1 The physical properties of each material used to produce mechanical couplings shall be available from the coupling
manufacturer upon request.
4.2 Specifications outlining all the physical properties and effects of environmental conditions for materials of manufacture shall
be available from the coupling manufacturer upon request.
NOTE 2—Materials should have a demonstrated resistance to environmental stress cracking when exposed, under stress, to chemical compounds
encountered in or external to conduit systems and a demonstrated resistance to bacteriological decomposition. Such compounds include, but are not
limited to, alkalines, fertilizers, ice thawing chemicals, insecticides, herbicides, and acids.
5. Performance Requirements
5.1 The following requirements shall be met on each coupling design and nominal size. Any revisions by the manufacturer to
the original coupling design after the initial qualification testing requires retesting to ensure conformance with these requirements.
All coupling/conduit joint assemblies shall be prepared in accordance with 8.2.
NOTE 3—It is permissible when accomplishing these tests to do so on only the thickest and thinnest (lowest and highest DR) conduit wall sections in
Specification F2160 that the coupling is to be used on. If in those tests all performance requirements are met, all wall thicknesses between those tested
may be considered as having met the requirements.
5.2 Pressure Requirements:
5.2.1 Sustained Internal Pressure—The coupling/conduit joint assemblies shall not fail by leakage as described by and tested
in accordance with 9.1.
5.2.2 Sustained External Pressure—The coupling/conduit joint assemblies shall not fail by leakage as described by and tested
in accordance with 9.2.
5.3 Tensile Strength Requirements :
5.3.1 Pullout Resistance—The coupling/conduit joint assemblies tested shall be able to shall comply with tensile loading
requirements in Table 1 when tested in accordance with 9.3.
NOTE 4—Minimum pullout resistance’s in Table 1 were derived by the following formula. Double the requirements for constant tensile load in Table
2.
5.4 Constant Tensile Load—The joint or coupling shall not fail by pullout when loaded to axial tensile load requirements in
Table 2 and tested in accordance with 9.4.
NOTE 5—The constant tensile load test is intended to demonstrate that a joint in the conduit system is resistant to the effects of long term creep that
may result from temperature changes and other forces after installation. Load values in Table 2 were derived by the following methodology. Nominal
modulus of elasticity of high density polyethylene (113 000 psi) × coefficient of thermal expansion (0.00011 in./in./F°) × 50°F (10°C) temperature change
× average area of DR11 conduit wall.
5.5 Impact Resistance—The coupling Coupling specimens, not as part of assemblies, shall not fail as defined by and tested in
accordance with 9.5.
6. Dimensions
6.1 The manufacturer, upon request of the user shall furnish critical dimensions and tolerances of his couplings.
NOTE 6—Because of the varied fitting designs of couplings available for use on PE conduit a table of dimensions would be meaningless and without
value and is therefore omitted from this standard.
7. Workmanship, Finish, and Appearance
7.1 The manufacture of these couplings shall be in accordance with good commercial practice, uniform in color and free of
visual defects such as burrs, cracks, holes, foreign materials or voids so as to produce fittings meeting the requirements of this
standar
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