1、Designation: F2623 14Standard Specification forPolyethylene of Raised Temperature (PE-RT) SDR 9 Tubing1This standard is issued under the fixed designation F2623; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification establishes requirements for polyeth-ylene of raised temperature (PE-RT) SDR 9 tubing that isoutside diamet
3、er controlled, and pressure rated for water at73F (23C), 140F (60C) and 180F (82.2C). Included arerequirements for material, workmanship, dimensions andtolerances, product tests, and markings for PE-RT tubing.1.2 The text of this specification references notes, footnotes,and appendixes which provide
4、 explanatory material. Thesenotes and footnotes (excluding those in tables and figures) shallnot be considered as requirements of the specification.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that ar
5、e provided for information onlyand are not considered standard.1.4 The tubing produced under this specification shall bepermitted for use in general fluid transport, including hydronicsand irrigations systems.1.5 The following safety hazards caveat pertains only to thetest methods portion, Section 7
6、, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to u
7、se.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and FittingsD1600 Terminolog
8、y forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD3350 Specification for Polyethy
9、lene Plastics Pipe and Fit-tings MaterialsD3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryF412 Terminology Relating to Plastic Piping Systems2.2 ANSI Standard:B36.10 Standards Dimensions of Steel Pipe (NTS)32.3 Federal Standard:FED-STD-123 Marking f
10、or Shipment (Civil Agencies)42.4 Military Standard:MIL-STD-129 Marking for Shipment and Storage42.5 PPI Standard:PPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB),Strength Design Basis (SDB), Pressure Design Basis(PDB) and Minimum Required Strength (MRS) Ratingsfor Thermoplastic Piping Material
11、s or Pipe53. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412, and abbreviations are in accordance with Termi-nology D1600, unless otherwise specified. The abbreviation forpolyethylene of raised temperature is PE-RT. Plastic tubingdenotes a particular diameter schedule
12、of plastic pipe in whichoutside diameter of the tubing is equal to the nominal size plus18 in. Plastic pipe outside diameter schedule conforms toANSIB36.10.3.2 Definitions of Terms Specific to This Standard:3.2.1 hydrostatic design stress (HDS)the estimated maxi-mum tensile stress the material is ca
13、pable of withstandingcontinuously with a high degree of certainty that failure of the1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 on OlefinBased Pipe.Current edition approved Dec. 15, 2014. Publis
14、hed January 2015. Originallyapproved in 2007. Last previous edition approved in 2008 as F262308. DOI:10.1520/F2623-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer t
15、o the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-509
16、4, Attn: NPODS.5Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. U
17、nited States1tube will not occur. This stress is circumferential when internalhydrostatic water pressure is applied.3.2.2 pressure rating (PR)the estimated maximum waterpressure the tube is capable of withstanding continuously witha high degree of certainty that failure of the tube will not occur.3.
18、2.3 relation between dimensions, hydrostatic designstress, and pressure ratingthe following expression, com-monly known as the ISO equation,6is used in this specificationto relate dimensions, hydrostatic design stress, and pressurerating:2S/P 5 DO/t! 2 1 (1)or2S/P 5 R 2 1where:S = hydrostatic design
19、 stress, psi (or MPa),P = pressure rating, psi (or MPa),DO= average outside diameter, in. (or mm),T = minimum wall thickness, in. (or mm), andR = standard dimension ratio, SDR.3.2.4 standard dimension ratio (SDR)the ratio of outsidediameter to wall thickness. For PE-RT-tubing, it is calculatedby div
20、iding the average outside diameter of the tubing in inchesor in millimeters by the minimum wall thickness in inches ormillimeters. If the wall thickness calculated by this formula isless than 0.070 in. (1.78 mm) it shall be arbitrarily increased to0.070 in. except for sizes18 in. and smaller. The SD
21、R valuesshall be rounded to the nearest 0.5.3.2.5 standard thermoplastic material designated codethepipe material designation code shall consist of the abbreviationfor the type of plastic (PE) followed by Arabic numerals whichdescribe the short term properties in accordance with Specifi-cation D3350
22、, the hydrostatic design stress for water at 73.4F(23C) in units of 100 psi with any decimal figures dropped.Where the hydrostatic design stress code contains less than twofigures, a zero is used before the number.4. Tubing Classification4.1 GeneralThis specification covers one PE-RT tubingmaterial
23、in one standard dimension ratio, 9.0, and havingpressure ratings for water at 73F and 180F and optionally at140F. The pressure ratings decrease as the temperature isincreased.4.2 Standard Thermoplastic Pipe Dimension Ratio (SDR)This specification covers PE-RT tubing in one standarddimension ratio (S
24、DR 9) and nominal tubing sizes (NTS) from18 in. through 6 in. with a maximum continuous use tempera-ture that shall be 180F (82.2C). The pressure ratings areuniform for all nominal tubing sizes.5. Materials5.1 GeneralThe plastic used to make tubing shall bevirgin plastic or reworked plastic, as spec
25、ified in 5.3, and shallhave Plastics Pipe Institute (PPI) long-term hydrostatic designstress and pressure ratings at 73F and 180F. The ratings at140F are an optional standard.5.2 Barrier LayersPE-RT tubing may incorporate an op-tional interior wall, mid wall or outer wall layer or a combi-nation of
26、such layers of non-PE-RT material for the expresspurpose of providing gas barrier properties to the pipe. Thetubing shall meet the minimum wall thickness requirements ofthis standard without using the barrier layer thickness in thedeterminations. PE-RT tubing with a barrier layer within thewall of t
27、he tubing (neither exterior layer nor interior layer)shall demonstrate a hydrostatic design stress (HDS) ratingequivalent to that of PE-RT tubing without a barrier layer. Thisdetermination shall be made in accordance with policies no lessrestrictive than those of the PPI HSB and meet the require-men
28、ts of this standard.5.3 Rework MaterialClean rework material of the samecommercial designation, generated from the manufacturersown tubing production shall not be used unless the tubingproduced meet all the requirements of this specification.5.4 ClassificationPolyethylene materials suitable for usei
29、n the manufacture of tubing under this specification shall beclassified in accordance with Specification D3350 and asshown in Table 1. The material shall have minimum HDS andpressure ratings as per Table 2. The ratings at 140F areoptional.5.5 Tubing Material DesignationThe tubing meeting therequirem
30、ents of this specification shall be designated PE-RT.6. Requirements6.1 WorkmanshipThe tubing shall be homogeneousthroughout and free of visible cracks, holes, foreign inclusions,or other defects. The tubing shall be as uniform as commer-cially practicable in color, opacity, density, and other physi
31、calproperties.6.2 Dimensions and Tolerances:6.2.1 Outside Diameters of TubingThe outside diametersand tolerances shall be as shown in Table 3, when measured inaccordance with 7.4 and 7.4.1.6.2.2 Wall Thickness of TubingThe wall thickness andtolerances shall be as shown in Table 4, when measured inac
32、cordance with 7.4 and 7.4.2.6.3 Sustained PressureThe tubing shall not fail, balloon,burst, or weep as defined in Test Method D1598, at the testpressures given in Table 5 when tested in accordance with 7.5.6.4 Burst PressureThe minimum burst pressure forPE-RT plastic tubing shall be as given in Tabl
33、e 6, whendetermined in accordance with 7.6.6ISO 161-1.TABLE 1 Required D3350 Cell Classifications for PE-RTPhysical Properties:Density 2, 3, or 4Melt index 2, 3, 4, or 5Flexural modulus 3 or 4Tensile strength 2 or 3Slow crack growth resistance 7Hydrostatic design basis 3 or 4F2623 1426.5 Oxidative R
34、esistancePE-RT tubing shall have a mini-mum extrapolated time-to-failure of 50 years when tested andevaluated in accordance with 7.7.6.6 Bent TubePE-RT tubing, up to and including 1 in.nominal diameter, can be installed bent by the techniquedescribed in Appendix X3 provided the following requirement
35、sare met. Bent tubing, with a radius of 6 times the outsidediameter and consisting of a continuous bend length inducingnot less than 90 angle, shall meet the 180F (82.2C)minimum hydrostatic sustained pressure strength requirementsshown in Table 5 when tested in accordance with 7.8. The bendlength an
36、d bend angle is kept throughout the testing period byrigid secures immediately outside the bend. The minimum testduration shall be 1000 h without failure.NOTE 1PE-RT tubing, larger than 1 in. nominal diameter, is typicallyinstalled as main distribution lines and is installed in straight runs. Fittin
37、gsare used when a change in direction of 90 or greater and a bend radius ofless than 6 times the outside diameter is needed. The test procedures in 6.6are intended to evaluate PE-RT tubing installed in tight bend applicationsin accordance with the procedure in Appendix X3. This applicationapplies to
38、 tubing up to and including 1 in. nominal diameter only.7. Test Methods7.1 ConditioningCondition the specimens at 73.4 6 3.6F(23 6 2C) and 50 6 5 % relative humidity for not less than 40h prior to test in accordance with Procedure A of PracticeD618, for those tests where conditioning is required. In
39、 casesof disagreement, the tolerances shall be 61.8F (61C) and62 % relative humidity.7.2 Test ConditionsConduct the test in the standard labo-ratory atmosphere of 73.4 6 3.6F (23 6 2C) and 50 6 5%relative humidity, unless otherwise specified in the test meth-ods or in this specification. In cases of
40、 disagreement, thetolerances shall be 61.8F (61C) and 62 % relative humid-ity.7.3 SamplingA sufficient quantity of tubing, as agreedupon by the purchaser and the seller, shall be selected andtested to determine conformance with this specification. In thecase of no prior agreement, random samples sel
41、ected by thetesting laboratory shall be deemed adequate.7.3.1 Test SpecimensUnless otherwise specified in thisstandard or as agreed upon by the purchaser and the seller, thequantity and size of the specimens to be tested shall be asspecified by the test method referred to in this standard.7.4 Dimens
42、ions and TolerancesUse any length of tubingto determine the dimensions. Measure in accordance with TestMethod D2122.7.4.1 Outside DiameterMeasure the outside diameter ofthe tubing in accordance with Test Method D2122. The refereemethod of measurement is to be by circumferential wrap tape.The toleran
43、ce for out-of-roundness shall apply only to tubingprior to shipment. Averaging micrometer or vernier calipermeasurements, four (4) maximum and minimum diametermeasurements at any cross section, may be used for qualitycontrol checks if desired.7.4.2 Wall ThicknessMake micrometer measurements ofthe wa
44、ll thickness in accordance with Test Method D2122 todetermine the maximum and minimum values. Measure thewall thickness at both ends of the tubing to the nearest 0.001 in.(0.025 mm).7.5 Sustained Pressure TestSelect the test specimens atrandom. Test six specimens as per Test Method D1598 in waterat
45、73F (23C) and 180F (82.2C) as shown in Table 5.Iftheoptional 140F rating is desired, perform an additional test at140F (60C) in accordance with Table 5. Each specimen oftubing shall be at least five times the nominal diameter inlength and not less than 12 in. (25 cm) or more than 3.0 ft (91cm) betwe
46、en end closures. Maintain the specimens at thepressures indicated for the appropriate temperatures for aperiod of 1000 h. Failure of two of the six specimens tested ateither temperature constitutes failure in the test. Failure of oneof six specimens tested at either temperature is cause for retestof
47、 six additional specimens at that temperature. Failure of oneof six specimens tested at either temperature in retest consti-tutes failure in the test. Failure of the tubing shall be defined inaccordance with Test Method D1598.7.6 Burst PressureDetermine the sample complies withthe minimum burst pres
48、sure requirements by testing at leastfive specimens in accordance with Test Method D1599 MethodB. The pressure values are given in Table 6.7.7 Oxidative ResistanceThe test shall be conducted andthe extrapolated time-to-failure shall be determined in accor-dance with Test Method F2023. The test fluid
49、 shall be preparedin accordance with 9.1.1 of Test Method F2023. The extrapo-lated time-to-failure shall be calculated in accordance with13.3 of Test Method F2023.7.7.1 SignificanceThe test need only be performed onceand only once for the original validation of a compound testedin the form of a tube.Acompound is defined as the PE-RT resinand the stabilization system. It shall not be required to performplant or extrusion line verification testing.7.8 Bent Tube TestDetermine in accordance with TestMethod D1598,
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