ASTM F1733-24

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: F1733 − 20 F1733 − 24 An American National Standard
Standard Specification for
Butt Heat Fusion Polyamide(PA) Plastic Fitting for
Polyamide(PA) Plastic Pipe and Tubing
This standard is issued under the fixed designation F1733; 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 covers polyamide (PA) butt fusion fittings for use with polyamide pipe (IPS and Metric) and tubing (CTS).
Included are requirements for materials, workmanship, dimensions, marking, sustained pressure, and burst pressure.
1.2 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.
1.3 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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 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:
D1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
D1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings
D1600 Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D4066 Classification System for Nylon Injection and Extrusion Materials (PA)
D6779 Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)
F412 Terminology Relating to Plastic Piping Systems
F2785 Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
F2945 Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
2.2 Federal Standard:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
CFR Title 49 Part 192 Transportation of Natural and Other Gas By Pipeline: Minimum Federal Safety Standards
2.3 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.
Current edition approved Nov. 1, 2020Feb. 1, 2024. Published November 2020February 2024. Originally approved in 1996. Last previous edition approved in 20132020
as F1733–13. DOI: 10.1520/F1733-20.–20. DOI: 10.1520/F1733-24.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
Available from DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
*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
F1733 − 24
2.4 National Sanitation Foundation Standard:
Standard No. 14 for Plastic Piping Components and Related Materials
NSF/ANSI 61 Drinking Water System Components – Health Effects Standard Overview
3. Terminology
3.1 Definitions are in accordance with Terminology F412 and abbreviations are in accordance with Terminology D1600, unless
otherwise specified.
3.2 dimension ratio (DR) for thermoplastic pipe—the ratio of diameter to wall thickness. For this specification it is calculated by
dividing the specified outside diameter by the specified wall thickness of the fitting at its area of fusion. DRs are rounded and do
not calculate exactly.
4. Classification
4.1 General—This specification covers butt fusion fittings intended for use with polyamide pipe and tubing.
4.1.1 Fittings covered by this specification are normally molded. Fittings may be machined from extruded or molded stock.
4.1.2 Fittings fabricated by thermal welding are not included in this specification.
4.1.3 Fittings intended for use in the distribution of natural gas or petroleum fuels shall also meet the requirements of Specification
F2945 for PA11 materials or Specification F2785 for PA12 materials.
5. Ordering Information
5.1 When ordering fittings under this specification, the following should be specified:
5.1.1 Polyamide compound (material designation or trade name)
5.1.2 Style of fitting (tee, 90° ell, and the like)
5.1.3 Size:Size:
5.1.3.1 Nominal diameter.
5.1.3.2 CTS, IPS, or schedule.
5.1.3.3 Dimension ratio number or schedule number.
6. Materials
6.1 Basic Materials—This specification covers fittings made from polyamide plastics as defined in Specifications D4066 or
D6779.
NOTE 1—The PA plastic fittings intended for use in the transport of potable water should be evaluated and certified as safe for this purpose by a testing
agency acceptable to the local health authority. The evaluation should be in accordance with requirements for chemical extraction, taste, and odor, that
are no less restrictive than those included in National Sanitation Foundation (NSF) Standard No. 14. The seal or mark of the laboratory making the
evaluation should be included on the pipe and tubing.
6.2 Compounds—The polyamide fittings compounds shall meet the requirements for Group 3, Class 2, and Grade 3, or Group 4,
Class 2 and Grade 3 as prescribed in Specifications D4066 or D6779.
NOTE 2—Fittings produced from compounds meeting the requirements of Group 3, Class 2, and Grade 3 (PA 323) are intended for use with pipe
manufactured from compounds meeting the requirements of Group 3, Class 2, and Grade 3. Fittings produced from compounds meeting the requirements
of Group 4, Class 2, and Grade 3 (PA 423) are intended for use with pipe manufactured from compounds meeting the requirements of Group 4, Class
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http://www.nsf.org.
F1733 − 24
2, and Grade 3. As per the recommendations of respective resin manufacturers, no cross fusion between PA 323 pipe and fittings and PA 423 pipe and
fittings is permitted.
6.3 Rework Material—Clean rework material generated from the manufacturer’s own production may be used by the same
manufacturer as long as the fittings produced conform to the requirements of this specification.
7. Requirements
7.1 Dimensions and Tolerances:
7.1.1 Outside Diameter—Nominal outside diameters of butt fusion fittings shall conform to the nominal iron pipe size (IPS) or
copper tubing size (CTS) dimensions at area of fusion. These dimensions and tolerances shall be as shown in Table 1, Table 2,
and Table 3 of this specification.
7.1.2 Inside Diameter (CTS Fittings Only)—Inside diameters of butt fusion fittings for tubing at area of fusion shall conform to
the dimensions of the tubing being joined. The dimensions and tolerances for the fittings are shown in Table 3.
7.1.3 Wall Thickness—The wall thicknesses of butt fusion fittings shall not be less than the minimum specified for the pipe or
tubing. The wall thicknesses and tolerances at the area of fusion shall be as shown in Table 3, Table 4, and Table 5 of this
specification.
7.1.4 Measurements—These shall be made in accordance with the applicable sections of Test Method D2122 for roundable pipe.
7.1.5 Design Dimensions—Overall fitting dimensions may be as preferred from a design standpoint by the manufacturer and
accepted by the purchaser consistent with 7.1.3.
7.2 Pressure Test Requirements :
7.2.1 Short-Term Rupture Strength for Fittings ⁄2 to 12 in. and 90 to 315 mm, Nominal Diameter—The minimum short-term
rupture strength of the fitting and fused pipe or tubing shall not be less than the minimum short-term rupture strength of the pipe
or tubing in the system when tested in accordance with 10.5.3. These minimum pressures shall be as shown in Table 6 of this
specification. Test specimens shall be prepared for testing in the manner described in 10.5.1 of this specification. The test
equipment, procedures, and failures definitions shall be as specified in Test Method D1599.
TABLE 1 IPS Sizing System Outside Diameters and Tolerances
for Fittings for Use with Polyamide Pipe, in.
Nominal Pipe Average Outside Diameter
Tolerance
A
Size at Area of Fusion
⁄2 0.840 ±0.008
⁄4 1.050 ±0.008
1 1.315 ±0.010
1 ⁄4 1.660 ±0.010
1 ⁄2 1.900 ±0.010
2 2.375 ±0.010
3 3.500 ±0.012
4 4.500 ±0.015
6 6.625 ±0.018
8 8.625 ±0.025
10 10.750 ±0.027
12 12.750 ±0.036
14 14.000 ±0.063
16 16.000 ±0.072
18 18.000 ±0.081
20 20.000 ±0.090
21.5 21.500 ±0.097
22 22.000 ±0.099
24 24.000 ±0.108
28 28.000 ±0.126
32 32.000 ±0.144
36 36.000 ±0.162
42 42.000 ±0.189
48 48.000 ±0.216
A
Defined as measured ⁄4 in. (6.4 mm) from fitting outlet extremity.
F1733 − 24
TABLE 2 Metric Sizing System (ISO 161/1) Outside Diameters and
Tolerances for Fit for Use with Polyamide Pipe, (mm)
Average Outside Diameter at Area of Fusion
Nominal Pipe
A
Size
Min Max
90 90.0 90.8
110 110.0 111.0
160 160.0 161.4
200 200.0 201.8
250 250.0 252.3
280 280.0 282.5
315 315.0 317.8
355 355.0 358.2
400 400.0 403.6
450 450.0 454.1
500 500.0 504.5
560 560.0 565.0
630 630.0 635.7
710 710.0 716.4
800 800.0 807.2
900 900.0 908.1
1000 1000.0 1009.0
1200 1200.0 1210.8
1400 1400.0 1412.6
1600 1600.0 1614.4
A
Specified in ISO 3607.
7.2.2 Short-Term Strength for Fittings 14 to 48 in. and 355 to 1600 mm, Nominal Diameter—Fittings shall not fail when tested
in accordance with 10.5.3. The minimum pressure shall be as shown in Table 6 of this specification. Test specimens shall be
prepared for testing in the manner described in 10.2 of this specification. The test equipment and procedures shall be as specified
in Test Method D1599.
7.2.3 Sustained Pressure—The fitting and fused pipe or tubing shall not fail, as defined in Test Method D1598, when tested at the
time, pressures, and test temperatures selected from test options offered in Table 7. The test specimens shall be prepared for testing
in the manner prescribed in 10.5.1.
8. Workmanship, Finish, and Appearance
8.1 The manufacture of these fittings shall be in accordance with good commercial practice so as to produce fittings meeting the
requirements of this specification. Fittings shall be homogeneous throughout and free of cracks, holes, foreign inclusions, or other
injurious defects. The fittings shall be as uniform as commercially practicable in color, opacity, density, and other physical
properties.
9. Sampling
9.1 Fittings made for sale under this specification shall be sampled at a frequency appropriate for the end use intended. When the
fittings are to be installed under a system specification the minimum requirements of that specification must be satisfied.
10. Test Methods
10.1 General—The test methods in this specification cover fittings to be used with pipe and tubing for gas, water, and other
engineered piping systems. Test methods that are applicable from other specifications will be referenced in the paragraph pertaining
to the particular test. Certain special test methods applicable to this specification only are explained in the appropriate paragraph.
10.2 Conditioning—Unless otherwise specified, condition the specimens prior to test at 73 6 3.6 °F (23 6 2 °C) for not less than
6 h in air, or 1 h in water, for those tests where conditioning is required and in all cases of disagreement. Newly molded fittings
shall be conditioned 40 h prior to test.
10.3 Test Conditions—Conduct the tests at the standard laboratory temperature of 73 6 3.6 °F (23 6 2 °C) unless otherwise
specified.
F1733 − 24
TABLE 3 Diameter, Wall Thickness, and Tolerances for Fittings for Use with Polyamide Tubing
A
Diameter at Area of Fusion
Tubing Type, Nominal Tubing Minimum Wall
Outside, in. (mm) Inside, in. (mm)
in. (mm) Size, in. Thickness, in. (mm)
Average Tolerance Average Tolerance
0.062 (1.57) ⁄2 CTS 0.625 (15.88) ±0.010 (±0.26) 0.495 (12.58) ±0.004 (±0.10) 0.062 (1.58)
⁄4 CTS 0.875 (22.22) ±0.010 (±0.26) 0.745 (18.92) . . . . . .
0.090 (2.29) ⁄2 CTS 0.625 (15.88) ±0.010 (±0.26) 0.437 (11.10) ±0.004 (±0.10) 0.090 (2.28)
⁄4 CTS 0.875 (22.22) ±0.010 (±0.26) 0.687 (17.44) ±0.004 (±0.10) 0.090 (2.28)
1 CTS 1.125 (28.58) ±0.013 (±0.34) 0.937 (23.80) ±0.005 (±0.12) 0.090 (2.28)
1 ⁄4 CTS 1.375 (34.92) ±0.013 (±0.34) 1.187 (30.14) ±0.005 (±0.12) 0.090 (2.28)
DR 11 ⁄4 CTS 0.875 (22.22) ±0.010 (±0.26) 0.715 (18.16) ±0.004 (±0.10) 0.077 (1.96)
1 CTS 1.125 (28.58) ±0.013 (±0.34) 0.915 (23.24) ±0.005 (±0.12) 0.101 (2.56)
1 ⁄4 CTS 1.375 (34.92) ±0.013 (±0.34) 1.125 (28.58) ±0.005 (±0.12) 0.121 (3.08)
DR 9.3 ⁄2 CTS 0.625 (15.88) ±0.010 (±0.26) 0.483 (12.26) ±0.004 (±0.10) 0.067 (1.70)
⁄4 CTS 0.875 (22.22) ±0.010 (±0.26) 0.679 (17.24) ±0.004 (±0
...