ASTM F2176-02

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An American National Standard
Designation: F 2176 – 02
Standard Specification for
Mechanical Couplings Used on Polyethylene Conduit, Duct
and Innerduct
This standard is issued under the fixed designation F 2176; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope F 2160 Specification for Solid Wall (PE) Conduit (DR)
Based on Outside Diameter (OD)
1.1 This specification establishes requirements for material,
performance, workmanship and test methods for the qualifica-
3. Terminology
tion of 2 in. and smaller mechanical couplings that connect to
3.1 Definitions are in accordance with Terminology F 412
DR 15.5 and lower polyethylene conduit, duct and innerduct
and abbreviations are in accordance withTerminology D 1600,
covered by Specification F 2160. Throughout this standard,
unless otherwise specified.
“conduit” refers to “conduit, duct or innerduct” manufactured
3.2 Definitions of Terms Specific to This Standard:
in accordance with Specification F 2160.
3.2.1 coupling joint, n—the connection between the cou-
1.2 The values stated in inch-pound units are to be regarded
pling and a conduit end.
as standard. The values given in parentheses are mathematical
3.2.2 duct, n—a conduit (see Terminology F 412, conduit).
conversions to SI units which are provided for information
3.2.3 inline mechanical couplings, n—a device used to join
only and are not considered standard.
two conduit ends.
1.3 The couplings covered by this specification are typically
3.2.4 innerduct, n—a conduit installed inside a conduit.
designed to join between conduit ends (in-line coupling). The
same coupling-to-conduit joint design may be used as a part of
4. Materials and Manufacture
other coupling joint designs that telescope, or connect to
4.1 Thephysicalpropertiesofeachmaterialusedtoproduce
bulkheads,orotheradapterfittingdesigns.Therequirementsof
mechanical couplings shall be available from the coupling
this standard apply only to the coupling-to-conduit joint
manufacturer upon request.
design. The performance requirements of other coupling joint
4.2 Specifications outlining all the physical properties and
designs are not a part of this standard.
effects of environmental conditions for materials of manufac-
1.4 The following safety hazards caveat pertains only to the
ture shall be available from the coupling manufacturer upon
test methods portion, Section 9 of this specification. This
request.
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user
NOTE 1—Materials should have a demonstrated resistance to environ-
of this standard to establish appropriate safety and health mental stress cracking when exposed, under stress, to chemical com-
pounds encountered in or external to conduit systems and a demonstrated
practices and determine the applicability of regulatory require-
resistance to bacteriological decomposition. Such compounds include, but
ments prior to use.
are not limited to, alkalines, fertilizers, ice thawing chemicals, insecti-
cides, herbicides, and acids.
2. Referenced Documents
2.1 ASTM Standards:
5. Performance Requirements
D 638 Test Methods for Tensile Properties of Plastics
5.1 The following requirements shall be met on each cou-
D 1600 Terminology Relating to Abbreviations, Acronyms
pling design and nominal size. Any revisions by the manufac-
and Codes for Terms Relating to Plastics
turer to the original coupling design after the initial qualifica-
D 2444 Test Method for Impact Resistance of Thermoplas-
tion testing requires retesting to ensure conformance with these
tic Pipe and Fittings
requirements.
F 412 Terminology Related to Plastic Piping Systems
NOTE 2—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 F 2160 that the coupling is to be used on. If in
This specification is under the jurisdiction ofASTM Committee F17 on Plastic
those tests all performance requirements are met, all wall thicknesses
Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.
between those tested may be considered as having met the requirements.
Current edition approved April 10, 2002. Published June 2002.
Annual Book of ASTM Standards,Vol 5.2 Pressure Requirements:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F2176–02
TABLE 2 Mechanical Joint Constant Load Resistance
5.2.1 Sustained Internal Pressure—The coupling/conduit
joint shall not fail by leakage as described by and tested in Nominal Conduit Minimum Pullout
Size Resistance
accordance with 9.1.
⁄4 IPS 190 lbs (86.2 kg)
5.2.2 Sustained External Pressure—The coupling/conduit
1 IPS 380 lbs (172.4 kg)
joint shall not fail by leakage as described by and tested in
1 ⁄4 IPS 470 lbs (213.2 kg)
accordance with 9.2.
1 ⁄2 IPS 610 lbs (276.7 kg)
2 IPS 960 lbs (435.5 kg)
5.3 Tensile Strength Requirements:
5.3.1 Pullout Resistance—The coupling/conduit joint as-
semblies tested shall be able to comply with tensile loading
requirements in Table 1 when tested in accordance with 9.3.
times the conduit diameter. It is permissible to test multiple
NOTE 3—Minimum pullout resistance’s in Table 1 were derived by the
couplings together provided they are separated by a minimum
following formula. Double the requirements for constant tensile load in
distance equal to five times the conduit diameter.
Table 2.
8.2.2 Test joints shall be assembled on the appropriate size
5.4 Constant Tensile Load—The joint or coupling shall not
conduit in accordance with the fitting manufacturer’s joining
fail by pullout when loaded to axial tensile load requirements
procedure. For referee testing, conduit shall be straight with no
in Table 2 and tested in accordance with 9.4.
scratches or gouges.
8.2.3 Condition assembled test specimens a minimum of 2 h
NOTE 4—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
at the test temperature to be used after being assembled before
that may result from temperature changes and other forces after installa-
initiating test procedure.
tion. Load values in Table 2 were derived by the following methodology.
NOTE 6—The additional conditioning time following assembly of
Nominal modulus of elasticity of high density polyethylene (113 000 psi)
typical fitting designs used for conduit joining provides more consistent
3 coefficient of thermal expansion (0.00011 in./in./F°) 3 50°F (10°C)
test results.
temperature change 3 average area of DR11 conduit wall.
5.5 Impact Resistance—The coupling shall not fail as de- 8.3 Test Conditions—Testing shall be conducted at the
fined by and tested in accordance with 9.5
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