ASTM F1924-05(2011)
(Specification)Standard Specification for Plastic Mechanical Fittings for Use on Outside Diameter Controlled Polyethylene Gas Distribution Pipe and Tubing
Standard Specification for Plastic Mechanical Fittings for Use on Outside Diameter Controlled Polyethylene Gas Distribution Pipe and Tubing
ABSTRACT
This specification describes requirements and test methods for the qualification of plastic bodied mechanical fittings for use with outside diameter controlled polyethylene (PE) gas distribution pipe, nominal 2 pipe size (IPS) and smaller. In addition, it specifies general requirements of the material from which these fittings are made. Unless otherwise specified, each nominal size of fitting shall be tested. Testing of the thickest wall pipe that the fitting is designed to be used with qualifies the use of that fitting with pipe of lesser wall thickness. In order to determine the overall performance of the mechanical fittings, the following tests shall be performed: elevated temperature sustained pressure test, tensile strength test, temperature cycling test, constant tensile load joint test (in-line joints only), and rotation test (mechanical saddle fittings only).
SCOPE
1.1 This specification describes requirements and test methods for the qualification of plastic bodied mechanical fittings for use with outside diameter controlled polyethylene (PE) gas distribution pipe, nominal 2 pipe size (IPS) and smaller complying with Specification D2513. In addition, it specifies general requirements of the material from which these fittings are made.
1.2 The test methods described in this specification are not intended to be used as routine quality control tests.
1.3 This specification covers the types of mechanical fittings described in 3.2.1.
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 The following safety hazards caveat pertains only to the test method portion, Section 7, 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 and health practices and determine the applicability of regulatory limitations prior to use.
1.6 The text of this specification references notes and footnotes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this specification.
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Standards Content (Sample)
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An American National Standard
Designation: F1924 – 05 (Reapproved 2011)
Standard Specification for
Plastic Mechanical Fittings for Use on Outside Diameter
Controlled Polyethylene Gas Distribution Pipe and Tubing
This standard is issued under the fixed designation F1924; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D1600 Terminology for Abbreviated Terms Relating to
Plastics
1.1 Thisspecificationdescribesrequirementsandtestmeth-
D2513 Specification for Polyethylene (PE) Gas Pressure
ods for the qualification of plastic bodied mechanical fittings
Pipe, Tubing, and Fittings
for use with outside diameter controlled polyethylene (PE) gas
D2837 TestMethodforObtainingHydrostaticDesignBasis
distribution pipe, nominal 2 pipe size (IPS) and smaller
forThermoplasticPipeMaterialsorPressureDesignBasis
complying with Specification D2513. In addition, it specifies
for Thermoplastic Pipe Products
general requirements of the material from which these fittings
F412 Terminology Relating to Plastic Piping Systems
are made.
F1588 Test Method for Constant Tensile Load Joint Test
1.2 The test methods described in this specification are not
(CTLJT)
intended to be used as routine quality control tests.
2.2 ASME Standard:
1.3 Thisspecificationcoversthetypesofmechanicalfittings
ASME B31.8 Gas Transmission and Distribution Piping
described in 3.2.1.
Systems
1.4 Thevaluesstatedininch-poundunitsaretoberegarded
2.3 Federal Standard:
as standard. The values given in parentheses are mathematical
CFR, Title 49, Part 192 Pipeline Safety Regulations
conversions to SI units that are provided for information only
2.4 Plastics Pipe Institute Standard:
and are not considered standard.
PPI TR-4 Recommended Hydrostatic Strengths and Design
1.5 The following safety hazards caveat pertains only to the
Stresses forThermoplastic Pipe and Fittings Compounds
test method portion, Section 7, of this specification. This
standard does not purport to address all of the safety concerns,
3. Terminology
if any, associated with its use. It is the responsibility of the user
3.1 Definitions—Definitions of terms used in this specifica-
of this standard to establish appropriate safety and health
tionareinaccordancewithTerminologyF412unlessotherwise
practices and determine the applicability of regulatory limita-
specified. Abbreviations are in accordance with Terminology
tions prior to use.
D1600 unless otherwise specified.
1.6 The text of this specification references notes and
3.1.1 The Gas Industry terminology used in this specifica-
footnotes,whichprovideexplanatorymaterial.Thesenotesand
tion is in accordance withASMEB31.8 or CFR, Title 49, Part
footnotes (excluding those in tables and figures) shall not be
192 unless otherwise indicated.
considered as requirements of this specification.
3.1.2 The term “pipe” used herein refers to both “pipe” and
2. Referenced Documents “tubing”unlessspecificallystatedotherwise.Theterm“fitting”
2 refers to a mechanical connecting device as described in 3.1.4
2.1 ASTM Standards:
and 3.1.6.
D638 Test Method for Tensile Properties of Plastics
3.1.3 joint, n—the location at which two pieces of pipe, or
D1598 Test Method for Time-to-Failure of Plastic Pipe
a pipe and a fitting are connected together, for example, an
Under Constant Internal Pressure
installed coupling has two joints.
This specification is under the jurisdiction ofASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas. Available from American Society of Mechanical Engineers (ASME), ASME
Current edition approved Feb. 1, 2011. Published March 2011. Originally International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
´1
approved in 1998. Last previous edition approved in 2001 as F1924–01 . DOI: www.asme.org.
10.1520/F1924-05. Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM dodssp.daps.dla.mil.
Standards volume information, refer to the standard’s Document Summary page on Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,
the ASTM website. Irving, TX 75062, http://www.plasticpipe.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1924 – 05 (2011)
3.1.4 joint, mechanical, n— a connection between piping 4.2 Thephysicalpropertiesofeachmaterialusedtoproduce
components employing physical force to develop a seal or thefittingshallbeavailablefromthefittingmanufacturerupon
produce alignment. request.
4.3 Specifications outlining all the physical properties and
3.1.5 long-term strength (LTS), n—the estimated tensile
effects of environmental conditions for materials of manufac-
stress that when applied continuously will cause failure at
ture shall be available from the fitting manufacturer upon
100000 h. This is the intercept of the stress regression line
request.
with the 100000 h coordinate.
3.1.6 mechanical fitting, n—fittingformakingamechanical
NOTE 1—Materialsinlong-termcontactwithnaturalgasoflinequality
and LP gas vapor should be demonstrated not to adversely affect the
joint to provide for pressure integrity, leak tightness, and
performance of the fitting.
depending on category, as defined in this specification, resis-
NOTE 2—Materials should have a demonstrated resistance to environ-
tance to end loads.
mental stress cracking when exposed, under stress, to chemical com-
3.1.6.1 category 1 mechanical fitting, n—fitting for assem-
pounds encountered in, or external to gas piping systems, and a demon-
bling pipes, which includes a compression zone(s) to provide
strated resistance to bacteriological decomposition. Such compounds
include, but are not limited to, ice thawing chemicals, fertilizers, insecti-
for pressure integrity, leak tightness, and resistance to end
cides, herbicides, leak detection fluids, acids, bases and antifreeze
loadssufficienttocausenolessthan25%elongationofthePE
solutions used to thaw frozen lines. The effects of liquid environments,
piping as described in this specification.
such as antifreeze agents, odorants, and hydrocarbons are known to be
3.1.6.2 category 2 mechanical fitting, n—fitting for assem-
deleterious to some plastics, particularly when under service conditions.
bling pipes, which includes a compression zone(s) to provide
5. Dimensions
for pressure integrity and leak tightness only. Category 2
fittings do not provide for resistance to end loads.
5.1 The dimensions and tolerances shall be determined by
3.1.7 MAOP, n—the Maximum Allowable Operating Pres- the manufacturer.
sure of the fuel gas piping system, in psig, as determined in
6. Qualification Requirements
accordance with CFR, Title 49, Part 192.121 and as repre-
6.1 General—Unlessotherwisespecified,eachnominalsize
sented in the following:
of fitting shall be tested. Testing of the thickest wall pipe that
MAOP 5 P 52 3 S/ R21 3 f (1)
~ !
D
the fitting is designed to be used with qualifies the use of that
where: fitting with pipe of lesser wall thickness.
S = the PE material’s HDB as published in PPI TR-4.
6.1.1 Mechanical joint qualifications shall be performed on
R = the pipe’s dimension ratio determined by dividing the
assembled joints using the fitting manufacturer’s joining pro-
pipe’sspecifiednominaloutsidediameterbythepipes
cedure. All mechanical fittings offered by the manufacturer
specified nominal wall thickness; and,
shall be capable of meeting the requirements of this standard
f = the design (derating) factor for thermoplastic fuel gas
D when connecting polyethylene gas piping complying with
piping as set by the authority having jurisdiction. In
Specification D2513. To verify the structural integrity of the
the United States the design factor is cited in CFR,
fitting body, representative samples shall be subjected to the
Title 49 Part 192.121.
requirementsof6.2.1.Itisnottheintentofthisspecificationto
3.2 Definitions of Terms Specific to This Standard: require testing of all fitting configurations, that is, tees, ells,
etc., but each mechanical joint design in each size.
3.2.1 Types of Mechanical Fittings:
6.1.2 Allmechanicalfittingsdescribedin3.2.1shallhavean
3.2.2 in-line fitting, n—mechanical fitting used to make a
internal pipe reinforcing tubular insert stiffener that extends at
mechanical joint where the bore axis of the compression and
least under the seal and gripping device, where used. The
sealing zones of the fitting is essentially the same as the
saddle portion of saddle-type fittings do not require an internal
connected piping, for example, couplings, ells, and tees.
tubular stiffener due to the nature of the connection.
3.2.3 mechanical saddle fitting, n—mechanical fitting used
6.2 Performance Requirements:
to make a mechanical joint that allows a lateral connection to
6.2.1 Elevated Temperature Sustained Pressure—The fit-
an existing main in which a portion of the fitting is contoured
ting,jointorpipeintheareaaffectedbythefittingshallnotfail
to match the O.D. of the pipe to which it is attached. Herein
as defined in Test Method D1598, when tested in accordance
referred to as the saddle fitting mating pipe.
with7.2.Thefittingorjointmeetsthisrequirementwhentested
inaccordancewithanyoneofthethreeconditions(A,B,orC)
4. Materials and Manufacture Requirements
listed in 7.2.
4.1 Plastic pressure containing materials subject to continu- 6.2.2 Tensile Strength—The pipe joint shall accommodate
ous stress, either hoop or axial, shall have an ASTM material the tensile loadings when tested in accordance with 7.3.
specification, and the materials long-term strength, such as the 6.2.2.1 In-Line Fittings, Category 1—The joint shall pro-
long-term hydrostatic strength, determined in accordance with vide resistance to a force on the pipe joint equal to or greater
TestMethodD2837,exceptingthatfailuredatacanbeobtained thanthatwhichwillcausenolessthan25%elongationofpipe,
from specimens such as the following: tensile bars, plane or the pipe fails outside the joint area when tested in accor-
strain, or actual fitting samples. A material listing in PPI dance with 7.3.
TR-4document is evi
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