ASTM F2145-23

Standard Specification for Polyamide 11 (PA 11) and Polyamide 12 (PA12) Mechanical Fittings for Use on Outside Diameter Controlled Polyamide 11 and Polyamide 12 Pipe and Tubing

ABSTRACT
This specification describes requirements and test methods for the qualification of Polyamide 11 (PA 11) bodied mechanical fittings for use with outside diameter controlled PA 11 pipe, and nominal 2 pipe size (IPS) and smaller. In addition, it specifies general requirements of the material from which these fittings are made. Performance requirements shall include tests to determine elevated temperature sustained pressure, tensile strength, in-line fitting, mechanical saddle fittings, temperature cycling, and joint constant tensile load.
SCOPE
1.1 This specification describes requirements and test methods for the qualification of Polyamide 11 (PA 11) and Polyamide 12 (PA 12) bodied mechanical fittings for use with outside diameter controlled PA 11, nominal 2 pipe size (IPS), and smaller complying with Specification F2945, and PA 12, nominal 2 pipe size (IPS), and smaller complying with Specification F2785. 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 tests.  
1.3 This specification covers the types of mechanical fittings covered 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 methods 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, health, and environmental 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.  
1.7 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

• Status: Published
• Publication Date: 31-Jan-2023
• ICS: 23.040.45 - Plastics fittings
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.60 - Gas

Relations

• Refers: ASTM F2945-18(2023) - Standard Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 01-Nov-2023
• Refers: ASTM F412-20 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Apr-2020
• Refers: ASTM F1588-96(2019) - Standard Test Method for Constant Tensile Load Joint Test (CTLJT)
• Effective Date: 01-Nov-2019
• Refers: ASTM F412-19 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Jan-2019
• Refers: ASTM F2945-18 - Standard Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 01-Sep-2018
• Refers: ASTM F2785-18 - Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 15-Apr-2018
• Refers: ASTM D1600-18 - Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
• Effective Date: 01-Jan-2018
• Refers: ASTM F412-17a - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Aug-2017
• Refers: ASTM F412-17 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Feb-2017
• Refers: ASTM F412-16a - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 15-Nov-2016
• Refers: ASTM F412-16 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Aug-2016
• Refers: ASTM D1598-15 - Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
• Effective Date: 01-Nov-2015
• Refers: ASTM F1588-96(2015) - Standard Test Method for Constant Tensile Load Joint Test (CTLJT)
• Effective Date: 01-Aug-2015
• Refers: ASTM F412-15 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Jun-2015
• Refers: ASTM F2945-15 - Standard Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 01-Mar-2015

Overview

ASTM F2145-23 is the international standard specifying requirements for mechanical fittings made from Polyamide 11 (PA 11) and Polyamide 12 (PA 12) for use with outside diameter controlled PA 11 and PA 12 pipes and tubing. Developed by ASTM International Committee F17 on Plastic Piping Systems, this standard is integral to the safe, efficient use of PA 11 and PA 12 fittings in gas distribution and related applications. F2145-23 defines qualification criteria, test methods, performance requirements, and marking rules to ensure these fittings perform reliably under applicable service conditions.

Key Topics

• Material Requirements: The standard outlines the required properties and long-term strength of PA 11 and PA 12 materials used in mechanical fittings. Materials must meet specific criteria as per ASTM F2945 (PA 11) and ASTM F2785 (PA 12) for gas pressure applications.
• Types of Fittings: Covered mechanical fittings include in-line fittings (such as couplings, ells, and tees) and mechanical saddle fittings, both critical for connecting and branching PA 11 and PA 12 piping systems.
• Qualification Testing: F2145-23 specifies rigorous tests for product qualification, including:
  • Elevated temperature sustained pressure testing
  • Tensile strength evaluation
  • Joint performance under constant tensile load
  • Temperature cycling to simulate service conditions
  • Rotation tests for mechanical saddle fittings
• Dimensional Requirements: Fitting sizes, tolerances, and compatibility with controlled outside diameter PA 11 and PA 12 pipes are stipulated, referencing nominal IPS (iron pipe size) dimensions up to 2 inches.
• Marking and Identification: Fittings must be clearly marked with product, material, and manufacturer details, ensuring traceability and proper selection for gas distribution applications.

Applications

ASTM F2145-23 is essential for industries involved in natural gas distribution, industrial pipeline systems, and other applications requiring robust, leak-tight connections in plastic piping systems. Applications include:

• Natural Gas Distribution Networks: Ensures safe, pressure-rated connections between PA 11 and PA 12 pipes and fittings in municipal and utility gas lines.
• Industrial Gas Piping: Suitable for fuel gas piping in various industrial processes and facilities, supporting compliance with federal and industry regulations.
• Retrofit and New Installations: Facilitates upgrades and new construction in plastic piping infrastructure, offering reliable performance in both in-line and branch connections via mechanical fittings.
• Harsh Environments: The prescribed materials and test requirements help ensure resistance to chemicals, stress cracking, and extreme temperature fluctuations encountered in the field.

Related Standards

For comprehensive system performance and regulatory alignment, ASTM F2145-23 references and is complemented by several key standards:

• ASTM F2945: Specification for Polyamide 11 gas pressure pipe, tubing, and fittings
• ASTM F2785: Specification for Polyamide 12 gas pressure pipe, tubing, and fittings
• ASTM D2513: Specification for thermoplastic gas pressure pipe, tubing, and fittings (historically referenced for PA 11)
• ASME B31.8: Gas transmission and distribution piping systems standard
• CFR Title 49 Part 192: US federal safety standards for gas pipelines
• PPI TR-4: Pressure design and material strength ratings for thermoplastic piping materials

Together, these standards ensure interoperability, safety, and performance across the spectrum of plastic piping system components used in gas and fuel distribution.

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Keywords: ASTM F2145-23, Polyamide 11, PA 11, Polyamide 12, PA 12, mechanical fittings, gas pipe fittings, plastic piping systems, gas distribution, piping standards, temperature cycling, tensile strength, elevated pressure testing, pipe joint reliability, ASTM plastics standards

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: F2145 − 23 An American National Standard
Standard Specification for
Polyamide 11 (PA 11) and Polyamide 12 (PA12) Mechanical
Fittings for Use on Outside Diameter Controlled Polyamide
11 and Polyamide 12 Pipe and Tubing
This standard is issued under the fixed designation F2145; 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 This specification describes requirements and test meth- 2.1 ASTM Standards:
ods for the qualification of Polyamide 11 (PA 11) and Poly- D638 Test Method for Tensile Properties of Plastics
amide 12 (PA 12) bodied mechanical fittings for use with D1598 Test Method for Time-to-Failure of Plastic Pipe
outside diameter controlled PA 11, nominal 2 pipe size (IPS), Under Constant Internal Pressure
and smaller complying with Specification F2945, and PA 12, D1600 Terminology for Abbreviated Terms Relating to Plas-
nominal 2 pipe size (IPS), and smaller complying with Speci- tics
fication F2785. In addition, it specifies general requirements of D2837 Test Method for Obtaining Hydrostatic Design Basis
the material from which these fittings are made. for Thermoplastic Pipe Materials or Pressure Design Basis
for Thermoplastic Pipe Products
1.2 The test methods described in this specification are not
F412 Terminology Relating to Plastic Piping Systems
intended to be used as routine quality tests.
F1588 Test Method for Constant Tensile Load Joint Test
1.3 This specification covers the types of mechanical fittings
(CTLJT)
covered in 3.2.1.
F2785 Specification for Polyamide 12 Gas Pressure Pipe,
1.4 The values stated in inch-pound units are to be regarded Tubing, and Fittings
F2945 Specification for Polyamide 11 Gas Pressure Pipe,
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only Tubing, and Fittings
2.2 ASME Standard:
and are not considered standard.
ASME B31.8 Gas Transmission and Distribution Piping
1.5 The following safety hazards caveat pertains only to the
Systems
test methods portion, Section 7, of this specification. This
2.3 Federal Standard:
standard does not purport to address all of the safety concerns,
CFR, Title 49, Part 192 Transportation of Natural and Other
if any, associated with its use. It is the responsibility of the user
Gas By Pipeline: Minimum Federal Safety Standards
of this standard to establish appropriate safety, health, and
2.4 Plastic Pipe Institute Standard:
environmental practices and determine the applicability of
PPI TR-4 PPI Listing of Hydrostatic Design Bases (HDB),
regulatory limitations prior to use.
Pressure Design Bases (PDB), and Minimum Required
1.6 The text of this specification references notes and
Strength (MRS) Ratings for Thermoplastic Piping Mate-
footnotes, which provide explanatory material. These notes and
rials or Pipe
footnotes (excluding those in tables and figures) shall not be
considered as requirements of this specification.
3. Terminology
1.7 This international standard was developed in accor-
3.1 Definitions:
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Development of International Standards, Guides and Recom-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
mendations issued by the World Trade Organization Technical
Standards volume information, refer to the standard’s Document Summary page on
Barriers to Trade (TBT) Committee.
the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
This specification is under the jurisdiction of ASTM Committee F17 on Plastic www.asme.org.
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas. Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Current edition approved Feb. 1, 2023. Published March 2023. Originally Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
approved in 2001. Last previous edition approved in 2018 as F2145–13(2018). DOI: Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,
10.1520/F2145-23. Irving, TX 75062, http://www.plasticpipe.org.
*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
F2145 − 23
3.1.1 Definitions of the terms used in this specification are 4. Materials and Manufacture Requirements
in accordance with Terminology F412 unless otherwise speci-
4.1 Polyamide 11 (PA 11) and Polyamide 12 (PA12) pres-
fied. Abbreviations are in accordance with Terminology D1600
sure containing materials subject to continuous stress, either
unless otherwise specified.
hoop or axial, shall meet the requirements of Specification
3.1.2 The Gas Industry Terminology is in accordance with
F2945 for Polyamide 11 and Specification F2785 for PA12,
ASME B31.8 or CFR, Title 49, Part 192 unless otherwise
have an ASTM material specification, and the materials long-
specified.
term strength, such as the long-term hydrostatic strength,
3.1.3 The term “pipe” refers to both “pipe” and “tubing”.
determined in accordance with Test Method D2837, excepting
The term “fitting” refers to a mechanical connecting device as that failure data can be obtained from specimens such as the
described in 3.1.5 and 3.1.7.
following: tensile bars, plane strain, or actual fitting samples.
3.1.4 joint, n—the location at which two pieces of pipe and
4.2 The physical properties of the PA 11 and PA 12 material
a fitting are connected together. For example, an installed
used to produce the fitting shall be available from the fitting
coupling has two joints.
manufacturer upon request.
3.1.5 joint, mechanical, n—a connection between piping
4.3 Specifications outlining all the physical properties and
components and employing physical force to develop a seal or
effects of environmental conditions for the PA 11 and PA 12
produce alignment.
material used to produce the fitting shall be available from the
fitting manufacturer upon request.
3.1.6 long-term-strength (LTS), n—the estimated tensile
NOTE 1—Materials in long term contact with natural gas of line quality
stress that when applied continuously will cause failure at
and LP gas vapor should be demonstrated not to adversely affect the
100 000 h. This is the intercept of the stress regression line with
performance of the fitting.
the 100 000 h coordinate.
NOTE 2—Materials should have demonstrated resistance to environ-
mental stress cracking when exposed, under stress to chemical compounds
3.1.7 mechanical fitting, n—fitting for making a mechanical
encountered in, or external gas piping systems, and a demonstrated
joint to provide for pressure integrity, leak tightness, and
resistance to bacteriological decomposition. Such compounds include ice
resistance to end loads. thawing chemicals, fertilizers, insecticides, herbicides, leak detection
fluids, acids, bases, and, antifreeze solutions used to thaw frozen lines. The
3.1.7.1 category 1 mechanical fitting, n— fitting for assem-
effects of liquid environments such as antifreeze agents, odorants, and
bling pipes, which includes a compression zone to provide for hydrocarbons are known to be deleterious to some plastics, particularly
under service conditions.
pressure integrity, leak tightness, and resistance to end loads
sufficient to cause no less than 25 % elongation of the PA 11 or
5. Dimensions
PA 12 piping as described in this specification.
5.1 The dimensions and tolerance shall be determined by
3.1.8 MAOP, n—The Maximum Allowable Operating Pres-
the manufacturer.
sure of the fuel gas piping system in psig as determined in
accordance with CFR, Title 49, Part 192 and as represented in
6. Qualification Requirements
the following:
6.1 General—Unless otherwise specified, each nominal size
MAOP 5 P 5 2 × S/~DR 2 1! × f (1)
D
of fitting shall be tested. Testing of the thickest wall pipe that
the fitting is designed to be used with qualifies it with use of
where:
lesser wall thickness.
S = the PA 11 or PA 12 material’s HDB as published in PPI
6.1.1 Mechanical joint qualifications shall be performed on
TR-4,
assembled joints using the fitting manufacturers joining proce-
DR = the pipe’s dimension ratio determined by dividing the
dure. All mechanical fitting offered by the manufacturer shall
pipe’s specified nominal outside diameter by the
be capable of meeting the requirements of this standard when
pipe’s specified wall thickness; and,
connecting Polyamide 11 complying with Specification F2945
f = the design factor for thermoplastic fuel gas piping as
D
or Polyamide 12 gas piping complying with Specification
set by the authority having jurisdiction. In the United
F2785. To verify the structural integrity of the fitting body,
States, the design factor is cited in CFR, Title 49, Part
representative samples shall be subjected to the requirements
192.121.
of 6.2.1. It is not the intent of the specification to require testing
3.2 Definitions of Terms Specific to This Standard:
of all fitting configurations, that is, tees, ells, etc., but each
3.2.1 Types of Mechanical Fittings:
mechanical joint design in each size.
3.2.2 in-line fitting, n—mechanical fitting used to make a
6.1.2 All mechanical fitting described in 3.2.1 shall have an
mechanical joint where the bore axis of compression and
internal pipe reinforcing tubular insert stiffener that extends at
sealing zones of the fitting is essentially the same as the
least under the seal and gripping device, where used. The
connected pipe, for example, couplings, ells, and tees.
saddle portion of saddle-type fittings do not require an internal
tubular stiffener due to the nature of the connection.
3.2.3 mechanical saddle fitting, n—mechanical fitting used
to make a mechanical joint that allows a lateral connection to 6.2 Performance Requirements:
an exiting main in which a portion of the fitting is contoured to 6.2.1 Elevated Temperature Sustained Pressure—The fitting
match the O.D. of the pipe to which it is attached. Herein joint or pipe in the area affected by the fitting shall not fail as
referred to as the saddle fitting mating pipe or main pipe size. defined in Test Method D1598, when tested in accordance with
F2145 − 23
TABLE 1 Elevated Temperature Sustained Pressure Test
7.2. The fitting or joint meets this requirement when tested in
Conditions
accordance with any one of the two conditions (A or B) listed
Condition Minimum Time Temperature Pipe Hoop Stress, S
in 7.2.
A 1000 h 176 °F ± 3.6 °F (80 °C ±
6.2.2 Tensile Strength—The pipe joint shall accommodate
2 °C) 1250 psi (8.62 M
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2145 − 13 (Reapproved 2018) F2145 − 23 An American National Standard
Standard Specification for
Polyamide 11 (PA 11) and Polyamide 12 (PA12) Mechanical
Fittings for Use on Outside Diameter Controlled Polyamide
11 and Polyamide 12 Pipe and Tubing
This standard is issued under the fixed designation F2145; 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*
1.1 This specification describes requirements and test methods for the qualification of Polyamide 11 (PA 11) and Polyamide 12
(PA 12) bodied mechanical fittings for use with outside diameter controlled Polyamide 11 (PA 11), PA 11, nominal 2 pipe size (IPS),
and smaller complying with Specification D2513F2945. Additionally, the requirements and test methods for the qualification of
Polyamide 12 (PA12) bodied mechanical fittings for use with outside diameter controlled Polyamide 11 (PA11) nominal 2 in pipe
size (IPS) and smaller complying with Specification , and PA 12, nominal 2 pipe size (IPS), D2513 and outside diameter controlled
Polyamide 12 (PA12) nominal 2 in pipe size (IPS) and smaller complying with Specification F2785. 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 tests.
1.3 This specification covers the types of mechanical fittings covered 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 methods 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, health, and environmental 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.
1.7 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:
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.
Current edition approved Feb. 1, 2018Feb. 1, 2023. Published March 2018March 2023. Originally approved in 2001. Last previous edition approved in 20132018 as
F2145F2145–13(2018).–13. DOI: 10.1520/F2145-13R18.10.1520/F2145-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
F2145 − 23
NOTE 1—For over 40 years D2513 was the singular US CFR Title 49 Part 192 referenced Standard Specification codifying the installation and use of
thermoplastic gas piping in jurisdictional installations. Initially all materials (PE, PVC, ABS, CAB) were contained within the body of the standard D2513.
In later years D2513 was completely reformatted to make it more user friendly by moving material-specific requirements from the standard’s body to
mandatory annexes. The next major change occurred late in 2009 at which time all thermoplastic materials, except polyethylene, were removed from
D2513 changing its Title and Scope from a thermoplastic gas piping standard to a polyethylene-only gas piping standard. This recent change required
that new standards be developed for those materials that were removed from D2513 including PA11. This causes problems for PA11 piping because it
has been referenced and permitted for jurisdictional use and installation under US CFR Title 49 Part 192 as complying with D2513 and D2513 no longer
has the A5 polyamide annex and Part 192 still references D2513-99 which makes for potential confusion. This puts PA11 gas piping standards into
somewhat of a limbo since D2513 is now a PE-only specification is referenced in all of these standards. Therefore until Part 192 is revised to reference
the new PA11 specification, F2945, PA11 has to fall back to citing the US Code referenced 1999 edition of D2513 in related standard such as this one.
Until CFR Title 49 Part 192 references the newly developed thermoplastic gas piping standards for those materials removed from D2513, there will be
dual references, both D2513–99 and F2945 for PA11, as seen in this standard. At which time Part 192 references F2945, the PA11 gas piping standard,
all references to D2513 and this note will be removed from these standards.
D638 Test Method for Tensile Properties of Plastics
D1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2513 Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings
D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for
Thermoplastic Pipe Products
F412 Terminology Relating to Plastic Piping Systems
F1588 Test Method for Constant Tensile Load Joint Test (CTLJT)
F2785 Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
F2945 Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
2.2 ASME Standard:
ASME B31.8 Gas Transmission and Distribution Piping Systems
2.3 Federal Standard:
CFR, Title 49, Part 192 Transportation of Natural and Other Gas By Pipeline: Minimum Federal Safety Standards
2.4 Plastic Pipe Institute Standard:
PPI TR-4 PPI Listing of Hydrostatic Design Bases (HDB), Pressure Design Bases (PDB), and Minimum Required Strength
(MRS) Ratings for Thermoplastic Piping Materials or Pipe
3. Terminology
3.1 Definitions:
3.1.1 Definitions of the terms used in this specification are in accordance with Terminology F412 unless otherwise specified.
Abbreviations are in accordance with Terminology D1600 unless otherwise specified.
3.1.2 The Gas Industry Terminology is in accordance with ASME B31.8 or CFR, Title 49, Part 192 unless otherwise specified.
3.1.3 The term “pipe” refers to both “pipe” and “tubing”. The term “fitting” refers to a mechanical connecting device as described
in 3.1.5 and 3.1.7.
3.1.4 joint, n—the location at which two pieces of pipe and a fitting are connected together. For example, an installed coupling
has two joints.
3.1.5 joint, mechanical, n—a connection between piping components and employing physical force to develop a seal or produce
alignment.
3.1.6 long-term-strength (LTS), n—the estimated tensile stress that when applied continuously will cause failure at
100 000 h. This is the intercept of the stress regression line with the 100 000 h coordinate.
3.1.7 mechanical fitting, n—fitting for making a mechanical joint to provide for pressure integrity, leak tightness, and resistance
to end loads.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
Available from DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825, Irving, TX 75062, http://www.plasticpipe.org.
F2145 − 23
3.1.7.1 category 1 mechanical fitting, n— fitting for assembling pipes, which includes a compression zone to provide for
pressure integrity, leak tightness, and resistance to end loads sufficient to cause no less than 25 % elongation of the PA 11 or PA 12
piping as described in this specification.
3.1.8 MAOP, n—The Maximum Allowable Operating Pressure of the fuel gas piping system in psig as determined in accordance
with CFR, Title 49, Part 192 and as represented in the following:
MAOP 5 P 5 2 ×S/ DR 2 1 ×f (1)
~ !
D
where:
S = the PA 11 or PA 12 material’s HDB as published in PPI TR-4,
DR = the pipe’s dimension ratio determined by dividing the pipe’s specified nominal outside diameter by the pipe’s specified
wall thickness; and,
f = the design factor for thermoplastic fuel gas piping as set by the authority having jurisdiction. In the United States, the
D
design factor is cited in CFR, Title 49, Part 192.121.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 Types of Mechanical Fittings:
3.2.2 in-line fitting, n—mechanical fitting used to make a mechanical joint where the bore axis of compression and sealing zones
of the fitting is essentially the same as the connected pipe, for example, couplings, ells, and tees.
3.2.3 mechanical saddle fitting, n—mechanical fitting used to make a mechanical joint that allows a lateral connection to an exiting
main in which a portion of the fitting is contoured to match the O.D. of the pipe to which it is attached. Herein referred to as the
saddle fitting mating pipe or main pipe size.
4. Materials and Manufacture Requirements
4.1 Polyamide 11 (PA 11) and Polyamide 12 (PA12) pressure containing materials subject to continuous stress, either hoop or
axial, shall meet the requirements of Specification D2513–99, Annex A5, Specification F2945 for Polyamide 11 and Specification
F2785 for PA12, have an ASTM material specification, and the materials long-term strength, such as the long-term hydrostatic
strength, determined in accordance with Test Method D2837, excepting that failure data can be obtained from specimens such as
the following: tensile bars, plane strain, or actual fitting samples.
4.2 The physical properties of the PA 11 and PA 12 material used to produce the fitting shall be available from the fitting
manufacturer upon request.
4.3 Specifications outlining all the physical properties and effects of environmental conditions for the PA 11 and PA 12 material
used to produce the fitting shall be available from the fitting manufacturer upon request.
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 performance
of the fitting.
NOTE 2—Materials should have demonstrated resistance to environmental stress cracking when exposed, under stress to chemical compounds encountered
in, or external gas piping systems, and a demonstrated resistance to bacteriological decomposition. Such compounds include ice thawing chemicals,
fertilizers, insecticides, herbicides, leak detection fluids, acids, bases, and, antifreeze solutions used to thaw frozen lines. The effects of liquid
environments such as antifreeze agents, odorants, and hydrocarbons are known to be deleterious to some plastics, particularly under service conditions.
5. Dimensions
5.1 The dimensions and tolerance shall be determined by the manufacturer.
6. Qualification Requirements
6.1 General—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 it with use of lesser wall thickness.
6.1.1 Mechanical joint qualifications shall be performed on assembled joints using the fitting manufacturers joining procedure. All
F2145 − 23
mechanical fitting offered by the manufacturer shall be capable of meeting the requirements of this standard when connecting
Polyamide 11 complying with Specification F2945 or Polyamide 12 gas piping complying with Specification D2513F2785–99 and
Specification F2945. To verify the structural integrity of the fitting body, representative samples shall be subjected to the
requirements of 6.2.1. It is not the intent of the speci
...