ASTM F2769-14
(Specification)Standard Specification for Polyethylene of Raised Temperature (PE-RT) Plastic Hot and Cold-Water Tubing and Distribution Systems
Standard Specification for Polyethylene of Raised Temperature (PE-RT) Plastic Hot and Cold-Water Tubing and Distribution Systems
SCOPE
1.1 This specification establishes requirements for polyethylene of raised temperature (PE-RT) plastic hot- and cold-water tubing and distribution systems components made in one standard dimension ratio and intended for 100 psig (6.9 bar) water service up to and including a maximum working temperature of 180°F (82°C). Components are comprised of tubing, fittings, valves and manifolds. Tubing may incorporate an optional polymeric inner, middle or outer layer. Testing of Specification F1807 and F2159 fittings and PE-RT tubing to the requirements of this standard indicate that these fittings are appropriate for use with PE-RT piping systems. Requirements and test methods are included for materials, workmanship, dimensions and tolerances, burst pressure, sustained pressure, oxidative resistance, temperature cycling tests, bend strength and environmental stress cracking. Also included are tests related to system malfunctions. The components covered by this specification are intended for use in residential and commercial, hot and cold, potable water distribution systems.
1.2 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
Note 1: Suggested hydrostatic design stresses and hydrostatic pressure ratings for tubing and fittings are listed in Appendix X1. UV labeling guidelines are provided in Appendix X2. Design, assembly, and installation considerations are provided in Appendix X3. An optional performance qualification and an in-plant quality control program are recommended in Appendix X4.
1.3 Units—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.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F2769 −14
StandardSpecification for
Polyethylene of Raised Temperature (PE-RT) Plastic Hot and
Cold-Water Tubing and Distribution Systems
This standard is issued under the fixed designation F2769; 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* if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
1.1 This specification establishes requirements for polyeth-
practices and determine the applicability of regulatory limita-
ylene of raised temperature (PE-RT) plastic hot- and cold-
tions prior to use.
water tubing and distribution systems components made in one
standard dimension ratio and intended for 100 psig (6.9 bar)
2. Referenced Documents
water service up to and including a maximum working
2.1 ASTM Standards:
temperature of 180°F (82°C). Components are comprised of
D618 Practice for Conditioning Plastics for Testing
tubing, fittings, valves and manifolds. Tubing may incorporate
D1598 Test Method for Time-to-Failure of Plastic Pipe
an optional polymeric inner, middle or outer layer. Testing of
Under Constant Internal Pressure
Specification F1807 and F2159 fittings and PE-RT tubing to
D1599 Test Method for Resistance to Short-Time Hydraulic
the requirements of this standard indicate that these fittings are
Pressure of Plastic Pipe, Tubing, and Fittings
appropriate for use with PE-RT piping systems. Requirements
D1600 TerminologyforAbbreviatedTermsRelatingtoPlas-
and test methods are included for materials, workmanship,
tics
dimensions and tolerances, burst pressure, sustained pressure,
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
oxidative resistance, temperature cycling tests, bend strength
D2122 Test Method for Determining Dimensions of Ther-
and environmental stress cracking. Also included are tests
moplastic Pipe and Fittings
related to system malfunctions. The components covered by
D2749 Symbols for Dimensions of Plastic Pipe Fittings
this specification are intended for use in residential and
D2837 Test Method for Obtaining Hydrostatic Design Basis
commercial, hot and cold, potable water distribution systems.
forThermoplasticPipeMaterialsorPressureDesignBasis
1.2 Thetextofthisspecificationreferencesnotes,footnotes,
for Thermoplastic Pipe Products
and appendixes which provide explanatory material. These
D3350 Specification for Polyethylene Plastics Pipe and Fit-
notesandfootnotes(excludingthoseintablesandfigures)shall
tings Materials
not be considered as requirements of the specification.
D3895 Test Method for Oxidative-Induction Time of Poly-
NOTE1—Suggestedhydrostaticdesignstressesandhydrostaticpressure
olefins by Differential Scanning Calorimetry
ratings for tubing and fittings are listed in Appendix X1. UV labeling
F412 Terminology Relating to Plastic Piping Systems
guidelines are provided in Appendix X2. Design, assembly, and installa-
tion considerations are provided in Appendix X3. An optional perfor-
F1282 Specification for Polyethylene/Aluminum/
mance qualification and an in-plant quality control program are recom-
Polyethylene (PE-AL-PE) Composite Pressure Pipe
mended in Appendix X4.
F1473 Test Method for Notch Tensile Test to Measure the
1.3 Units—The values stated in inch-pound units are to be
Resistance to Slow Crack Growth of Polyethylene Pipes
regarded as standard. The values given in parentheses are
and Resins
mathematical conversions to SI units that are provided for
F1807 Specification for Metal Insert Fittings Utilizing a
information only and are not considered standard.
Copper Crimp Ring for SDR9 Cross-linked Polyethylene
(PEX) Tubing and SDR9 Polyethylene of Raised Tem-
1.4 The following safety hazards caveat pertains only to the
perature (PE-RT) Tubing
test methods portion, Section 7, of this specification. This
F2023 Test Method for Evaluating the Oxidative Resistance
standard does not purport to address all of the safety concerns,
1 2
This test method is under the jurisdiction of ASTM Committee F17 on Plastic For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Piping Systems and is the direct responsibility of Subcommittee F17.26 on Olefin contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Based Pipe. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2014. Published January 2015. Originally the ASTM website.
approved in 2009. Last previous edition approved in 2010 as F2769–10. DOI: The last approved version of this historical standard is referenced on
10.1520/F2769-14. www.astm.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
F2769−14
of Crosslinked Polyethylene (PEX) Tubing and Systems 3.2.1 Discussion—For PE-RT-tubing, it is calculated by
to Hot Chlorinated Water dividingtheaverageoutsidediameterofthetubingininchesor
F2159 Specification for Plastic Insert Fittings Utilizing a in millimeters by the minimum wall thickness in inches or
Copper Crimp Ring for SDR9 Cross-linked Polyethylene millimeters. If the wall thickness calculated by this formula is
(PEX) Tubing and SDR9 Polyethylene of Raised Tem-
less than 0.070 in. (1.78 mm) it shall be arbitrarily increased to
perature (PE-RT) Tubing 0.070 in. except for sizes ⁄16 in. and smaller. The SDR values
shall be rounded to the nearest 0.5
2.2 ANSI Standard:
B36.10 Standards Dimensions of Steel Pipe (NTS)
3.3 Definitions of Terms Specific to This Standard:
Z 17.1 Preferred Numbers
3.3.1 hydrostatic design stress (HDS), n—the estimated
2.3 Federal Standard:
maximum tensile stress the material is capable of withstanding
FED-STD-123 Marking for Shipment (Civil Agencies)
continuously with a high degree of certainty that failure of the
2.4 Military Standard:
tube will not occur.This stress is circumferential when internal
MIL-STD-129 Marking for Shipment and Storage
hydrostatic water pressure is applied. For materials with
2.5 PPI Standards:
Hydrostatic Strength Classification 3 or 4 per Specification
PPI TR-3 Policies and Procedures for Developing Hydro-
D3350,theHDSisequaltothehydrostaticdesignbasis(HDB)
static Design Basis (HDB), Hydrostatic Design Stresses
times the design factor (DF) for water. For this standard, the
(HDS), Pressure Design Basis (PDB), Strength Design
design factor is equal to 0.5.
Basis (SDB), and Minimum Required Strength (MRS)
HDS 5 HDB 3 DF
Ratings for Thermoplastic Piping Materials or Pipe
5 HDB 30.5 ~for this standard!
PPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB),
3.3.2 relation between dimensions, hydrostatic design
Strength Design Basis (SDB), Pressure Design Basis
stress, and pressure rating, n—the following expression, com-
(PDB) and Minimum Required Strength (MRS) Ratings
monly known as the ISO equation , is used in this specification
for Thermoplastic Piping Materials or Pipe
7 to relate dimensions, hydrostatic design stress, and pressure
2.6 NSF Standards:
rating:
NSF 14 Standard No. 14 for Plastic Piping Components and
Related Materials 2HDS/P 5 D /t 21 (1)
~ !
o
NSF 61 Drinking Water System Components – Health Ef-
or
fects
2HDS/P 5 R 2 1
2.7 ISO Standard:
ISO13760 :Plasticspipesfortheconveyanceoffluidsunder
where:
pressure -- Miner’s rule -- Calculation method for cumu-
HDS = hydrostatic design stress, psi (or MPa),
lative damage
P = pressure rating, psig (or MPa),
DO = average outside diameter, in. (or mm),
3. Terminology
t = minimum wall thickness, in. (or mm), and
3.1 Terminology used in this standard is in accordance with
R = standard dimension ratio, SDR.
Terminologies F412, D1600, and D2749 unless otherwise
3.3.3 standard thermoplastic material designated code,
specified.The abbreviation for polyethylene of raised tempera-
n—the pipe material designation code shall consist of the
ture is PE-RT. Plastic tubing denotes a particular diameter
abbreviation for the type of plastic (PE) followed by Arabic
scheduleofplasticpipeinwhichoutsidediameterofthetubing
numerals which describe the short term properties in accor-
is equal to the nominal size plus ⁄8 in. Plastic pipe outside
dance with Specification D3350, the hydrostatic design stress
diameter schedule conforms to ANSI B36.10.
for water at 73°F (23°C) in units of 100 psi with any decimal
3.2 standard dimension ratio (SDR), n—a specific ratio of
figures dropped. Where the hydrostatic design stress code
the average specified outside diameter to the minimum speci-
containslessthantwofigures,azeroisusedbeforethenumber.
fied wall thickness (D /t) for outside diameter-controlled plas-
3.3.3.1 Discussion—Further information regarding testing
tic pipe, the value of which is derived by adding one to the
and approval can be obtained from the National Sanitation
pertinent number selected from the ANSI Preferred Number
Foundation or other accredited laboratory.
Series 10. F412
4. Classification
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4.1 Tubing—This specification covers one PE-RT tubing
4th Floor, New York, NY 10036, http://www.ansi.org.
material in one standard dimension ratio, 9.0, and by a
DLA Document Services Building 4/D 700 Robbins Avenue Philadelphia, PA
19111-5094http://quicksearch.dla.mil/ maximum continuous use temperature that shall be 180°F
Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825, 1
(82°C), and by nominal tubing sizes from ⁄8 through 6 in. 4.2
Irving, TX 75062, http://www.plasticpipe.org.
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd.,Ann
4.2 Fittings—This specification classifies fittings, including
Arbor, MI 48113-0140, http://www.nsf.org.
manifolds, intended for use in systems with PE-RT tubing, by
Available from International Organization for Standardization (ISO), 1, ch. de
a maximum continuous use temperature that shall be 180°F
la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http://
www.iso.ch. (82°C) and by nominal sizes from ⁄8 in. through 6 in. on the
F2769−14
TABLE 2 Pressure Ratings for PE-RT SDR 9 Tubing for Water
basis of resistance to burst pressure, hydrostatic sustained
pressure, excessive temperature and pressure, and thermocy- Rated Minimum Hydrostatic Minimum Pressure
Temperature Design Stress Rating for Water
cling.
°F (°C) psi (MPa) psi (bar)
73.4 (23) 640 (4.41) 160 (11.0)
5. Materials
180 (82.2) 400 (2.76) 100 (6.90)
5.1 General—The polyethylene used to make tubing shall
be virgin plastic or reworked plastic, or both, as specified in
5.4, that meets the requirements of this standard and shall have
5.6 Certification—Tubingandfittingsintendedforuseinthe
a Plastic Pipe Institute (PPI) rating at 73°F (23°C) and 180°F
transport of potable water shall be evaluated and certified as
(82°C). Fitting, manifold and valve materials shall meet the
safe for this purpose by a testing agency acceptable to the local
applicable requirements as described in Specifications F1807
healthauthority.Theevaluationshallbeinaccordancewiththe
or F2159. Fittings shall be made from materials that are
requirements for chemical extraction that are not less restric-
generally regarded as corrosion resistant.
tive than those included in NSF Standard 61. The seal or mark
of the laboratory making the evaluation shall be included on
5.2 Basic Tubing Materials—PE-RT tubing meeting the
requirements of this specification are primarily defined by two the tubing.
criteria namely, basic short-term properties, 5.2.1, and long-
NOTE 2—Further information regarding testing and approval can be
term hydrostatic properties, 5.2.2.
obtained from an accredited certification provider.
5.2.1 Basic Short-Term Properties—This specification cov-
6. Requirements
ers tubing materials meeting the following requirements:
5.2.1.1 Classification—Polyethylene materials suitable for
6.1 Workmanship—The tubing shall be homogeneous
use in the manufacture of tubing under this specification shall
throughout and free of visible cracks, holes, foreign inclusions,
be classified in accordance with Specification D3350 as shown
or other defects. The tubing shall be as uniform as commer-
in Table 1.
cially practicable in color, opacity, density, and other physical
5.2.2 Long-Term Hydrostatic Strength—This specification
properties. For tubing that incorporates a barrier layer per 5.3
covers PE-RT tubing which is further defined on the basis of
each layer shall meet the workmanship requirements per this
long-term hydrostatic strength tests (Appendix X1). The ma-
section.
terial shall have a minimum pressure rating as per Table 2.
6.2 Dimensions and Tolerances:
5.3 Barrier Layers—PE-RT tubing may incorporate an op-
6.2.1 Compliance with this specification requires that fit-
tional interior wall, mid wall or outer wall layer or a combi-
tings contained in Specifications F1807 and F2159 must meet
nation of such layers of non-PE-RT material for the express
the Performance and Test Method requirements of this stan-
purpose of providing gas barrier properties to the pipe. The
dard.
tubing shall meet the minimum wall thickness requirements of
6.2.2 Outside Diameters of Tubing—The outside diameters
this standard without using the barrier layer thickness in the
and tolerances of the tubing including the layers shall be as
determinations. PE-RT tubing with a barrier layer within the
shown in Table 3, when measured in accordance with 7.4 and
wall of the tubing (neither exterior layer nor interior layer)
7.4.1.
shall demonstrate a hydrostatic design stress (HDS) rating
6.2.3 Wall Thickness of Tubing—The wall thickness and
equivalent to that of PE-RTtubing without a barrier layer.This
tolerances shall be as shown in Table 4, when measured in
determinationshallbemadeinaccordancewithpoliciesnoless
accordance with 7.4 and 7.4.2.
restrictive than those of the PPI TR-3 and meet the require-
6.2.3.1 Layer—Tubing that incorporates an inner, middle or
ments of this standard.
outer layer shall meet the minimum wall thickness and
tolerances requirements as specified in Table 4. In addition, the
5.4 Rework Material—Clean rework material of the same
layer shall not result in the reduction of the total PE-RT
commercial designation, generated from the manufacturer’s
material below that specified in Table 4. In the case of tubing
own tubing production shall not be used unless the tubing
with a middle layer, the total base PE-RT material wall
producedmeetallthe
...
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: F2769 − 10 F2769 − 14 An American National Standard
Standard Specification for
Polyethylene of Raised Temperature (PE-RT) Plastic Hot and
Cold-Water Tubing and Distribution Systems
This standard is issued under the fixed designation F2769; 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 establishes requirements for polyethylene of raised temperature (PE-RT) plastic hot- and cold-water
tubing and distribution systems components made in one standard dimension ratio and intended for 100 psig (6.9 bar) water service
up to and including a maximum working temperature of 180°F (82°C). Components are comprised of tubing, fittings, valves and
manifolds. Tubing may incorporate an optional polymeric inner, middle or outer layer. Testing of Specification F1807 and F2159
fittings and PE-RT tubing to the requirements of this standard indicate that these fittings are appropriate for use with PE-RT piping
systems. Requirements and test methods are included for materials, workmanship, dimensions and tolerances, burst pressure,
sustained pressure, oxidative resistance, temperature cycling tests, bend strength and environmental stress cracking. Also included
are tests related to system malfunctions. The components covered by this specification are intended for use in residential and
commercial, hot and cold, potable water distribution systems.
1.2 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. These notes
and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
NOTE 1—Suggested hydrostatic design stresses and hydrostatic pressure ratings for tubing and fittings are listed in Appendix X1. UV labeling
guidelines are provided in Appendix X2. Design, assembly, and installation considerations are provided in Appendix X3. An optional performance
qualification and an in-plant quality control program are recommended in Appendix X4.
1.3 Units—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.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
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
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2749 Symbols for Dimensions of Plastic Pipe Fittings
D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for
Thermoplastic Pipe Products
D3350 Specification for Polyethylene Plastics Pipe and Fittings Materials
D3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry
F412 Terminology Relating to Plastic Piping Systems
F1282 Specification for Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Composite Pressure Pipe
This test method is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.26 on Olefin Based
Pipe.
Current edition approved Aug. 1, 2010Nov. 1, 2014. Published August 2010January 2015. Originally approved in 2009. Last previous edition approved in 20092010 as
F2769–09.–10. DOI: 10.1520/F2769-10.10.1520/F2769-14.
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.
*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
F2769 − 14
F1473 Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins
F1807 Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing
and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing
F2023 Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethylene (PEX) Tubing and Systems to Hot
Chlorinated Water
F2159 Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX)
Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing
2.2 ANSI Standard:
B36.10 Standards Dimensions of Steel Pipe (NTS)
Z 17.1 Preferred Numbers
2.3 Federal Standard:
FED-STD-123 Marking for Shipment (Civil Agencies)
2.4 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
2.5 PPI Standards:
PPI TR-3 Policies and Procedures for Developing Hydrostatic Design Basis (HDB), Hydrostatic Design Stresses (HDS),
Pressure Design Basis (PDB), Strength Design Basis (SDB), and Minimum Required Strength (MRS) Ratings for
Thermoplastic Piping Materials or Pipe
PPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB), Strength Design Basis (SDB), Pressure Design Basis (PDB) and
Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe
2.6 NSF Standards:
NSF 14 Standard No. 14 for Plastic Piping Components and Related Materials
NSF 61 Drinking Water System Components – Health Effects
2.7 ISO Standard:
ISO 13760 : Plastics pipes for the conveyance of fluids under pressure -- Miner’s rule -- Calculation method for cumulative
damage
3. Terminology
3.1 Terminology used in this standard is in accordance with Terminologies F412, D1600, and D2749 unless otherwise specified.
The abbreviation for polyethylene of raised temperature is PE-RT. Plastic tubing denotes a particular diameter schedule of plastic
pipe in which outside diameter of the tubing is equal to the nominal size plus ⁄8 in. Plastic pipe outside diameter schedule conforms
to ANSI B36.10.
3.2 standard dimension ratio (SDR), n—a specific ratio of the average specified outside diameter to the minimum specified wall
thickness (D /t) for outside diameter-controlled plastic pipe, the value of which is derived by adding one to the pertinent number
selected from the ANSI Preferred Number Series 10. F412
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.DLA
Document Services Building 4/D 700 Robbins Avenue 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.
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http://www.nsf.org.
Available from International Organization for Standardization (ISO), 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http://www.iso.ch.
3.2.1 Discussion—
For PE-RT-tubing, it is calculated by dividing the average outside diameter of the tubing in inches or in millimeters by the
minimum wall thickness in inches or millimeters. If the wall thickness calculated by this formula is less than 0.070 in. (1.78 mm)
it shall be arbitrarily increased to 0.070 in. except for sizes ⁄16 in. and smaller. The SDR values shall be rounded to the nearest
0.5
3.3 Definitions of Terms Specific to This Standard:
3.3.1 hydrostatic design stress (HDS), n—the estimated maximum tensile stress the material is capable of withstanding
continuously with a high degree of certainty that failure of the tube will not occur. This stress is circumferential when internal
hydrostatic water pressure is applied. For materials with Hydrostatic Strength Classification 3 or 4 per Specification D3350, the
HDS is equal to the hydrostatic design basis (HDB) times the design factor (DF) for water. For this standard, the design factor is
equal to 0.5.
HDS 5 HDB 3DF
5 HDB 30.5 for this standard
~ !
F2769 − 14
3.3.2 relation between dimensions, hydrostatic design stress, and pressure rating, n—the following expression, commonly
known as the ISO equation , is used in this specification to relate dimensions, hydrostatic design stress, and pressure rating:
2HDS/P 5 D /t 2 1 (1)
~ !
o
or
2HDS/P 5 R 2 1
where:
HDS = hydrostatic design stress, psi (or MPa),
P = pressure rating, psig (or MPa),
DO = average outside diameter, in. (or mm),
t = minimum wall thickness, in. (or mm), and
R = standard dimension ratio, SDR.
3.3.3 standard thermoplastic material designated code, n—the pipe material designation code shall consist of the abbreviation
for the type of plastic (PE) followed by Arabic numerals which describe the short term properties in accordance with Specification
D3350, the hydrostatic design stress for water at 73°F (23°C) in units of 100 psi with any decimal figures dropped. Where the
hydrostatic design stress code contains less than two figures, a zero is used before the number.
3.3.3.1 Discussion—
Further information regarding testing and approval can be obtained from the National Sanitation Foundation or other accredited
laboratory.
4. Classification
4.1 Tubing—This specification covers one PE-RT tubing material in one standard dimension ratio, 9.0, and by a maximum
continuous use temperature that shall be 180°F (82°C), and by nominal tubing sizes from ⁄8 through 6 in. 4.2
4.2 Fittings—This specification classifies fittings, including manifolds, intended for use in systems with PE-RT tubing, by a
maximum continuous use temperature that shall be 180°F (82°C) and by nominal sizes from ⁄8 in. through 6 in. on the basis of
resistance to burst pressure, hydrostatic sustained pressure, excessive temperature and pressure, and thermocycling.
5. Materials
5.1 General—The polyethylene used to make tubing shall be virgin plastic or reworked plastic, or both, as specified in 5.4, that
meets the requirements of this standard and shall have a Plastic Pipe Institute (PPI) rating at 73°F (23°C) and 180°F (82°C). Fitting,
manifold and valve materials shall meet the applicable requirements as described in Specifications F1807 or F2159. Fittings shall
be made from materials that are generally regarded as corrosion resistant.
5.2 Basic Tubing Materials—PE-RT tubing meeting the requirements of this specification are primarily defined by two criteria
namely, basic short-term properties, 5.2.1, and long-term hydrostatic properties, 5.2.2.
5.2.1 Basic Short-Term Properties—This specification covers tubing materials meeting the following requirements:
5.2.1.1 Classification—Polyethylene materials suitable for use in the manufacture of tubing under this specification shall be
classified in accordance with Specification D3350 as shown in Table 1.
5.2.2 Long-Term Hydrostatic Strength—This specification covers PE-RT tubing which is further defined on the basis of
long-term hydrostatic strength tests (Appendix X1). The material shall have a minimum pressure rating as per Table 2.
5.3 Barrier Layers—PE-RT tubing may incorporate an optional interior wall, mid wall or outer wall layer or a combination of
such layers of non-PE-RT material for the express purpose of providing gas barrier properties to the pipe. The tubing shall meet
the minimum wall thickness requirements of this standard without using the barrier layer thickness in the determinations. PE-RT
tubing with a barrier layer within the wall of the tubing (neither exterior layer nor interior layer) shall demonstrate a hydrostatic
design stress (HDS) rating equivalent to that of PE-RT tubing without a barrier layer. This determination shall be made in
accordance with policies no less restrictive than those of the PPI TR-3 and meet the requirements of this standard.
TABLE 1 Required D3350 Cell Classification for PE-RT
Physical Properties: Cell Classification
Density 3 or 4
Melt index 2, 3, 4, or 5
Flexural modulus 3 or higher
Tensile strength 2 or higher
Slow crack growth resistance 7
Hydrostatic Strength Classification 3 or 4
F2769 − 14
TABLE 2 Pressure Ratings for PE-RT SDR 9 Tubing for Water
Rated Minimum Hydrostatic Minimum Pressure
Temperature Design Stress Rating for Water
°F (°C) psi (MPa) psi (bar)
73.4 (23) 640 (4.41) 160 (11.0)
180 (82.2) 400 (2.76) 100 (6.90)
5.4 Rework Material—Clean rework material of the same commercial designation, generated from the manufacturer’s own
tubing production shall not be used unless the tubing produced meet all the requirements of this specification. PE-RT tubing with
a barrier layer shall not be used for rework material.
5.5 Tubing Material Designation—The tubing meeting the requirements of this specification shall be designated PE-RT.
5.6 Certification—Tubing and fittings intended for use in the transport of potable water shall be evaluated and certified as safe
for this purpose by a testing agency acceptable to the local health authority. The evaluation shall be in accordance with the
requirements for chemical extraction that are not less restrictive than those included in NSF Standard 61. The seal or mark of the
laboratory making the evaluation shall be included on the tubing.
NOTE 2—Further information regarding testing and approval can be obtained from an accredited certification provider.
6. Requirements
6.1 Workmanship—The tubing shall be homogeneous throughout and free of visible cracks, holes, foreign inclusions
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