ASTM F1588-96(2019)
(Test Method)Standard Test Method for Constant Tensile Load Joint Test (CTLJT)
Standard Test Method for Constant Tensile Load Joint Test (CTLJT)
SIGNIFICANCE AND USE
5.1 This test method was designed to be used to validate the long-term resistance to pullout of joints designed for use in plastic natural gas piping systems.
5.2 This test method is used in addition to the short-term tests required by OPS Part 192.283b, Title 49. Informal versions of this test method are used by manufacturers and utilities to demonstrate that a joint is resistant to the effects of long-term creep and meets the requirements for classification as a Category 1 or a Category 3 joint in accordance with Specification D2513.
5.3 This test method may also be applicable for the determination of the effects of a sustained axial load on joints or other components of plastic piping systems designed for other applications. Test parameters and the internal pressurizing fluid, if any, should be listed in the referencing document.
5.4 Documents that reference this test method for products other than joints shall specify test conditions and performance requirements. In general, such products pass this test if they maintain their structural integrity, do not leak, and perform to specification during and after the test.
SCOPE
1.1 The constant tensile load joint test (CTLJT) is designed to demonstrate that a joint in a plastic piping system is resistant to the effects of long-term creep.
1.1.1 The joint is subjected to an internal pressure at least equal to its operating pressure and a sustained axial tensile load for a specified time period, usually 1000 h. The joint shall not leak, nor may the pipe completely pull out for the test duration. The total axial stress is set by the referencing document.
1.1.2 Some typical conditions for testing of joints on polyethylene pipe are described in Appendix X1.
1.2 This test is usually performed at 73 °F (22.8 °C).
1.3 The CTLJT was developed to demonstrate the long-term resistance to pullout of mechanical joints on polyethylene gas pipe. The CTLJT has also been successfully applied to the evaluation of other components of plastic piping systems. These applications are discussed in Appendix X1.
1.4 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.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 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.
General Information
Relations
Standards Content (Sample)
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: F1588 − 96 (Reapproved 2019)
Standard Test Method for
Constant Tensile Load Joint Test (CTLJT)
This standard is issued under the fixed designation F1588; 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 2. Referenced Documents
1.1 The constant tensile load joint test (CTLJT) is designed 2.1 ASTM Standards:
todemonstratethatajointinaplasticpipingsystemisresistant D638 Test Method for Tensile Properties of Plastics
to the effects of long-term creep. D1600 Terminology forAbbreviatedTerms Relating to Plas-
1.1.1 The joint is subjected to an internal pressure at least tics
equaltoitsoperatingpressureandasustainedaxialtensileload D2122 Test Method for Determining Dimensions of Ther-
for a specified time period, usually 1000 h. The joint shall not moplastic Pipe and Fittings
leak, nor may the pipe completely pull out for the test duration. D2513 Specification for Polyethylene (PE) Gas Pressure
The total axial stress is set by the referencing document. Pipe, Tubing, and Fittings
1.1.2 Some typical conditions for testing of joints on poly- F412 Terminology Relating to Plastic Piping Systems
ethylene pipe are described in Appendix X1. 2.2 ANSI Standard:
B31.8 Gas Transmission and Distribution Piping Systems
1.2 This test is usually performed at 73 °F (22.8 °C).
2.3 Code of Federal Regulations:
1.3 TheCTLJTwasdevelopedtodemonstratethelong-term
OPS Part 192, Title 49
resistance to pullout of mechanical joints on polyethylene gas
pipe. The CTLJT has also been successfully applied to the 3. Terminology
evaluation of other components of plastic piping systems.
3.1 Definitions:
These applications are discussed in Appendix X1.
3.1.1 General—Definitions are in accordance with Test
1.4 The values stated in inch-pound units are to be regarded Method D638 and Terminology F412, unless otherwise speci-
as standard. The values given in parentheses are mathematical fied. Abbreviations are in accordance with Terminology
conversions to SI units that are provided for information only D1600.
and are not considered standard.
3.1.2 The gas industry terminology used in this test method
1.5 This standard does not purport to address all of the
is in accordance with the definitions given in ANSI B31.8 or
safety concerns, if any, associated with its use. It is the
OPS Part 192, Title 49, unless otherwise indicated.
responsibility of the user of this standard to establish appro-
3.2 Definitions of Terms Specific to This Standard:
priate safety, health, and environmental practices and deter-
3.2.1 mechanical joint, Category 1—a mechanical joint
mine the applicability of regulatory limitations prior to use.
designthatprovidesasealplusaresistancetoforceonthepipe
1.6 This international standard was developed in accor-
end, equal to or greater than that which will cause a permanent
dance with internationally recognized principles on standard-
deformation of the pipe or tubing. (D2513)
ization established in the Decision on Principles for the
3.2.2 mechanical joint, Category 3—a mechanical joint
Development of International Standards, Guides and Recom-
design that provides a seal plus a pipe restraint rating equiva-
mendations issued by the World Trade Organization Technical
lent to the anticipated thermal stresses occurring in a pipeline.
Barriers to Trade (TBT) Committee.
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
This test method is under the jurisdiction of ASTM Committee F17 on Plastic Standards volume information, refer to the standard’s Document Summary page on
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test the ASTM website.
Methods. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Nov. 1, 2019. Published November 2019. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
approvedin1995.Lastpreviouseditionapprovedin2015asF1588–96(2015).DOI: Available from U.S. Government Publishing Office, 732 N. Capitol St., NW,
10.1520/F1588-96R19. Washington, DC 20401-0001, http://www.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1588 − 96 (2019)
This category has a manufacturers’ pipe-end restraint that 6.1.1 Any loading method that maintains the correct, in-line
allowsslippageatlessthanthevaluerequiredtoyieldthepipe. tensile load on the joint (within 62 %) for the test duration is
(D2513) acceptable. Loading methods successfully employed for all
size loads include lever arms, hydraulic cylinders, and air
3.2.3 pipe—refers to both pipe and tubing.
cylinders.
6.1.2 Dead weight (a pile of scrap steel or iron) has worked
4. Summary of Test Method
well for loads up to 1 ton (907 kg) (see Note 2).
4.1 A joint is subjected to a sustained axial load for a
NOTE 2—To provide an adequate stress level for ⁄8 in. DR 7 PE tubing,
specified period of time (usually 1000 h).The test duration and
about 200 lb (90 kg) are required. Pipe 2 in. SDR11 PE requires about
the actual test conditions (axial stress, internal pressure, test
2000 lb (907 kg).
duration, and test temperature) are either specified by a
6.1.3 Hydraulic and air-powered loading frames have been
referencing document or, for new or unique applications,
constructed to provide up to 50 000 lb (22 680 kg) for tests on
agreed upon between the user and the manufacturer. X1.2
3 in. IPS through 8-in. IPS joints. The stroke of the cylinder
contains a background discussion of axial stress values and
should be adequate for the material being tested.
axial load determination.
6.2 Applied Axial Load Determination Monitoring—The
4.2 The joint is made to plastic pipe of the type, grade, size,
applied axial load shall be maintained to within 62 % of the
and dimension ratio to be used in the final application. The
calculated value.
axial tensile stress should be as high as possible, but shall be
6.2.1 Dead weight is weighed before the start of a test.
lower than the stress at which the plastic material continues to
6.2.2 In systems with air or hydraulic cylinders, a load-cell
stretch and finally yields (the long-term yield strength) (see
and indicator may be used between the cylinder and the test
Note 1).
assembly.An alternative is to accurately establish the relation-
NOTE 1—During the first hours of a test, the pipe elongates measurably.
ship between inlet pressure and the force generated by a
Elongation continues for the duration of the test at a decaying rate.
cylinder and then to monitor a pressure gauge placed in the
4.3 A joint passes this test if it does not leak and does not
pressurization line to the cylinder during the test.
pull out or allow slippage in excess of the manufacturers’
6.3 Pressure Gauge—Each assembly shall have a pressure
specified design slippage during the test duration.
gauge to monitor internal pressure on the test assembly. The
4.4 If a pipe in the test assembly yields before the specified
gauge shall be able to measure the test pressure to within an
minimum test time is attained, the total stress is above the
accuracy of 1 % or better.
long-term yield strength of that pipe and the test shall be
6.4 Test Assembly:
performed again at a stress level calculated to be below the
6.4.1 The test assembly is capped and verified to be leak
long-term yield strength of the pipe.
tight.Attachment devices that ensure straight line axial loading
shall be used at each end to attach the test assembly to the
5. Significance and Use
loading device. The test assembly may contain more than one
5.1 This test method was designed to be used to validate the
joint of the size under evaluation (see Note 3).
long-term resistance to pullout of joints designed for use in
NOTE 3—There are many configurations possible with the wide variety
plastic natural gas piping systems.
of joints that are available. If the mechanical joint to be tested is suitable
5.2 This test method is used in addition to the short-term for the purpose, it can be used to cap the pipe ends.
tests required by OPS Part 192.283b, Title 49. Informal
6.4.2 The minimum length is three pipe diameters between
versions of this test method are used by manufacturers and
fittings (stiffener ends). Elongation is proportional to specimen
utilities to demonstrate that a joint is resistant to the effects of
length. It is important to allow sufficient space in the apparatus
long-term creep and meets the requirements for classification
to provide for anticipated elongation of the test specimen for
as a Category 1 or a Category 3 joint in accordance with
the duration of the test.
Specification D2513.
5.3 This test method may also be applicable for the deter- 7. Precautions and Safety Considerations
mination of the effects of a sustained axial load on joints or
7.1 Each test fixture and joint assembly shall be designed to
other components of plastic piping systems designed for other
safely accommodate a sudden unexpected failure in any part of
applications. Test parameters and the internal pressurizing
the test assembly. Both fixture and joint(s) shall be regularly
fluid, if any, should be listed in the referencing document.
inspected for safety. Joint pullouts usually occur unexpectedly
5.4 Documents that reference this test method for products and proceed from start to finish in seconds. Failure may be
other than joints shall specify test conditions and performance accompanied by the sudden release of the internal pressure or
requirements. In general, such products pass this test if they a falling test assembly, or both.
maintain their structural integrity, do not leak, and perform to
7.2 It is strongly recommended that water be used as the
specification during and after the test.
pressurizingfluidwhentestingsystemsthatmayfail
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