ASTM F1924-98
(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
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 the standard. The values given in parentheses are for information only.
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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Designation: F 1924 – 98 An American National Standard
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 F 1924; 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 1588 Test Method for Constant Tensile Load Joint Test
(CTLJT)
1.1 This specification describes requirements and test meth-
2.2 ASME Standard:
ods for the qualification of plastic bodied mechanical fittings
ASME B31.8 Gas Transmission and Distribution Piping
for use with outside diameter controlled polyethylene (PE) gas
Systems
distribution pipe, nominal 2 pipe size (IPS) and smaller
2.3 Federal Standard:
complying with Specification D 2513. In addition, it specifies
CFR, Title 49, Part 192 Pipeline Safety Regulations
general requirements of the material from which these fittings
2.4 Plastics Pipe Institute Standard:
are made.
PPI TR-4 Recommended Hydrostatic Strengths and Design
1.2 The test methods described in this specification are not
Stresses for Thermoplastic Pipe and Fittings Compounds
intended to be used as routine quality control tests.
1.3 This specification covers the types of mechanical fittings
3. Terminology
described in 3.2.1.
3.1 Definitions—Definitions of terms used in this specifica-
1.4 The values stated in inch-pound units are to be regarded
tion are in accordance with Terminology F 412 unless other-
as the standard. The values given in parentheses are for
wise specified. Abbreviations are in accordance with Terminol-
information only.
ogy D 1600 unless otherwise specified.
1.5 The following safety hazards caveat pertains only to the
3.1.1 The Gas Industry terminology used in this specifica-
test method portion, Section 7, of this specification. This
tion is in accordance with ASME B31.8 or CFR, Title 49, Part
standard does not purport to address all of the safety concerns,
192 unless otherwise indicated.
if any, associated with its use. It is the responsibility of the user
3.1.2 The term “pipe” used herein refers to both “pipe” and
of this standard to establish appropriate safety and health
“tubing” unless specifically stated otherwise. The term “fitting”
practices and determine the applicability of regulatory limita-
refers to a mechanical connecting device as described in 3.1.4
tions prior to use.
and 3.1.6.
1.6 The text of this specification references notes and
3.1.3 joint, n—the location at which two pieces of pipe, or
footnotes, which provide explanatory material. These notes and
a pipe and a fitting are connected together, for example, an
footnotes (excluding those in tables and figures) shall not be
installed coupling has two joints.
considered as requirements of this specification.
3.1.4 joint, mechanical, n— a connection between piping
2. Referenced Documents components employing physical force to develop a seal or
produce alignment.
2.1 ASTM Standards:
2 3.1.5 long-term strength (LTS), n—the estimated tensile
D 638 Test Method for Tensile Properties of Plastics
stress that when applied continuously will cause failure at
D 1598 Test Method for Time-to-Failure of Plastic Pipe
3 100 000 h. This is the intercept of the stress regression line
Under Constant Internal Pressure
with the 100 000 h coordinate.
D 1600 Terminology for Abbreviated Terms Relating to
2 3.1.6 mechanical fitting, n—fitting for making a mechanical
Plastics
joint to provide for pressure integrity, leak tightness, and
D 2513 Specification for Thermoplastic Gas Pressure Pipe,
3 depending on category, as defined in this specification, resis-
Tubing, and Fittings
tance to end loads.
D 2837 Test Method for Obtaining Hydrostatic Design
Basis for Thermoplastic Pipe Materials
F 412 Terminology Relating to Plastic Piping Systems
Available from American Society of Mechanical Engineers, Three Park
This specification is under the jurisdiction of ASTM Committee F-17 on Plastic Avenue, New York, NY 10016–5990.
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas. Available from Superintendent of Documents, U.S. Government Printing
Current edition approved Oct. 10, 1998. Published March 1999. Office, Washington, DC 20402.
2 6
Annual Book of ASTM Standards, Vol 08.01. Available from Plastics Pipe Institute, 1801 K Street NW, Suite 600K,
Annual Book of ASTM Standards, Vol 08.04. Washington, DC 20402.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
F 1924
solutions used to thaw frozen lines. The effects of liquid environments,
3.1.6.1 category 1 mechanical fitting, n—fitting for assem-
such as antifreeze agents, odorants, and hydrocarbons are known to be
bling pipes, which includes a compression zone(s) to provide
deleterious to some plastics, particularly when under service conditions.
for pressure integrity, leak tightness, and resistance to end
loads sufficient to cause no less than 25 % elongation of the PE
5. Dimensions
piping as described in this specification.
5.1 The dimensions and tolerances shall be determined by
3.1.6.2 category 2 mechanical fitting, n—fitting for assem-
the manufacturer.
bling pipes, which includes a compression zone(s) to provide
for pressure integrity and leak tightness only. Category 2
6. Qualification Requirements
fittings do not provide for resistance to end loads.
3.1.7 MAOP, n—the Maximum Allowable Operating Pres- 6.1 General—Unless otherwise specified, each nominal size
sure of the fuel gas piping system, in psig, as determined in
of fitting shall be tested. Testing of the thickest wall pipe that
accordance with CFR, Title 49, Part 192.121 and as repre- the fitting is designed to be used with qualifies the use of that
sented in the following:
fitting with pipe of lesser wall thickness.
6.1.1 Mechanical joint qualifications shall be performed on
MAOP 5 P 5 2 3 S/~R21! 3 f (1)
D
assembled joints using the fitting manufacturer’s joining pro-
where:
cedure. All mechanical fittings offered by the manufacturer
S = the PE material’s HDB as published in PPI TR-4.
shall be capable of meeting the requirements of this standard
R = the pipe’s dimension ratio determined by dividing the
when connecting polyethylene gas piping complying with
pipe’s specified nominal outside diameter by the pipes
Specification D 2513. To verify the structural integrity of the
specified nominal wall thickness; and,
fitting body, representative samples shall be subjected to the
f = the design (derating) factor for thermoplastic fuel gas
D
requirements of 6.2.1. It is not the intent of this specification to
piping as set by the authority having jurisdiction. In
require testing of all fitting configurations, that is, tees, ells,
the United States the design factor is cited in CFR,
etc., but each mechanical joint design in each size.
Title 49 Part 192.121.
6.1.2 All mechanical fittings described in 3.2.1 shall have an
3.2 Definitions of Terms Specific to This Standard:
internal pipe reinforcing tubular insert stiffener that extends at
3.2.1 Types of Mechanical Fittings:
least under the seal and gripping device, where used. The
3.2.2 in-line fitting, n—mechanical fitting used to make a
saddle portion of saddle-type fittings do not require an internal
mechanical joint where the bore axis of the compression and
tubular stiffener due to the nature of the connection.
sealing zones of the fitting is essentially the same as the
6.2 Performance Requirements:
connected piping, for example, couplings, ells, and tees.
6.2.1 Elevated Temperature Sustained Pressure—The fit-
3.2.3 mechanical saddle fitting, n—mechanical fitting used
ting, joint or pipe in the area affected by the fitting shall not fail
to make a mechanical joint that allows a lateral connection to
as defined in Test Method D 1598, when tested in accordance
an existing main in which a portion of the fitting is contoured
with 7.2. The fitting or joint meets this requirement when tested
to match the O.D. of the pipe to which it is attached. Herein
in accordance with any one of the three conditions (A, B, or C)
referred to as the saddle fitting mating pipe.
listed in 7.2.
4. Materials and Manufacture Requirements
6.2.2 Tensile Strength—The pipe joint shall accommodate
the tensile loadings when tested in accordance with 7.3.
4.1 Plastic pressure containing materials subject to continu-
ous stress, either hoop or axial, shall have an ASTM material 6.2.2.1 In-Line Fittings, Category 1—The joint shall pro-
specification, and the materials long-term strength, such as the vide resistance to a force on the pipe joint equal to or greater
long-term hydrostatic strength, determined in accordance with than that which will cause no less than 25 % elongation of pipe,
Test Method D 2837, excepting that failure data can be or the pipe fails outside the joint area when tested in accor-
obtained from specimens such as the following: tensile bars, dance with 7.3.
plane strain, or actual fitting samples.
6.2.2.2 In-Line Fittings, Category 2—A joint design that
4.2 The physical properties of each material used to produce
provides a seal only. A mechanical joint designed for this
the fitting shall be available from the fitting manufacturer upon category excludes any provisions in the design of the joint to
request.
resist any axial pullout forces; therefore, tensile tests are not
4.3 Specifications outlining all the physical properties and required.
effects of environmental conditions for materials of manufac-
6.2.2.3 Mechanical Saddle Fittings—The joint between the
ture shall be available from the fitting manufacturer upon
saddle and mating pipe shall not fail by rotation or leakage
request.
when tested in accordance with 7.6.
6.2.2.4 Joint restraint capabilities less than as defined above
NOTE 1—Materials in long-term contact with natural gas of line quality
and LP gas vapor should be demonstrated not to adversely affect the shall constitute failure of the test.
performance of the fitting.
6.2.3 Temperature Cycling Test—The mechanical joint shall
NOTE 2—Materials should have a demonstrated resistance to environ-
provide a pressure seal after 10 cycles of the te
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