1、Designation: F 2623 08An American National StandardStandard Specification forPolyethylene of Raised Temperature (PE-RT) SDR 9 Tubing1This standard is issued under the fixed designation F 2623; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification establishes requirements for polyeth-ylene of raised temperature (PE-RT) SDR
3、 9 tubing that isoutside diameter controlled, and pressure rated for water at73F (23C), 140F (60C) and 180F (82.2C). Included arerequirements for material, workmanship, dimensions and tol-erances, product tests, and markings for PE-RT tubing.1.2 The text of this specification references notes, footn
4、otes,and appendixes which provide 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 the standard. The values given in parentheses are forinf
5、ormation only.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, of this specification. Thisstandard does not pu
6、rport 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 use.2. Referenced Documents2.1 ASTM Standards:2D 6
7、18 Practice for Conditioning Plastics for TestingD 1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD 1599 Test Method for Resistance to Short-Time Hydrau-lic Pressure of Plastic Pipe, Tubing, and FittingsD 1600 Terminology for Abbreviated Terms Relating toPlastics
8、D 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe Materials or Pressure DesignBasis for Thermoplastic Pipe ProductsD 3350 Specification for Polyethylene Plastics Pipe andFittings MaterialsD
9、 3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryF 412 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 for Shipment (Civil Agencies)42.4 Military
10、 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 Materials or Pipe53. Terminology3.1 DefinitionsDe
11、finitions are in accordance with Termi-nology F 412, and abbreviations are in accordance with Ter-minology D 1600, unless otherwise specified. The abbreviationfor polyethylene of raised temperature is PE-RT. Plastic tubingdenotes a particular diameter schedule of plastic pipe in whichoutside diamete
12、r 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 capable of withstandingcontinuously with
13、a high degree of certainty that failure of thetube will not occur. This stress is circumferential when internalhydrostatic water pressure is applied.1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 on
14、 OlefinBased Pipe.Current edition approved March 1, 2008. Published March 2008. Originallyapproved in 2007. Last previous edition approved in 2007 as F 262307.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
15、ASTMStandards volume information, refer to 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, 70
16、0Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.5Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2.2 pres
17、sure 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.3.2.3 relation between dimensions, hydrostatic designstress, and pressure ratingthe following expression, com-monly known as the
18、 ISO equation,6is used in this specificationto relate dimensions, hydrostatic design stress, and pressurerating:2S/P 5 DO/t! 1 (1)or2S/P 5 R 1where:S = hydrostatic design stress, psi (or MPa),P = pressure rating, psi (or MPa),DO= average outside diameter, in. (or mm),T = minimum wall thickness, in.
19、(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 dividing the average outside diameter of the tubing in inchesor in millimeters by the minimum wall thickness in inches ormillimeters.
20、 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 SDR valuesshall be rounded to the nearest 0.5.3.2.5 standard thermoplastic material designated codethepipe material designation code
21、 shall consist of the abbreviationfor the type of plastic (PE) followed by Arabic numerals whichdescribe the short term properties in accordance with Specifi-cation D 3350, the hydrostatic design stress for water at 73.4F(23C) in units of 100 psi with any decimal figures dropped.Where the hydrostati
22、c 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 in one standard dimension ratio, 9.0, and havingpressure ratings for water at 73F and 180F and optionally at140F. The pressure ra
23、tings decrease as the temperature isincreased.4.2 Standard Thermoplastic Pipe Dimension Ratio (SDR)This specification covers PE-RT tubing in one standard dimen-sion ratio (SDR 9) and nominal tubing sizes (NTS) from18 in.through 6 in. with a maximum continuous use temperature thatshall be 180F (82.2C
24、). The pressure ratings are uniform forall nominal tubing sizes.5. Materials5.1 GeneralThe plastic used to make tubing shall bevirgin plastic or reworked plastic, as specified in 5.3, and shallhave Plastics Pipe Institute (PPI) long-term hydrostatic designstress and pressure ratings at 73F and 180F.
25、 The ratings at140F are an optional standard.5.2 Barrier LayersPE-RT tubing may incorporate anoptional interior wall, mid wall or outer wall layer or acombination of such layers of non-PE-RT material for theexpress purpose of providing gas barrier properties to the pipe.The tubing shall meet the min
26、imum wall thickness require-ments of this standard without using the barrier layer thicknessin the determinations. PE-RT tubing with a barrier layer withinthe wall of the tubing (neither exterior layer nor interior layer)shall demonstrate a hydrostatic design stress (HDS) ratingequivalent to that of
27、 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-ments of this standard.5.3 Rework MaterialClean rework material of the samecommercial designation, generated from the manufacturersown
28、tubing production shall not be used unless the tubingproduced meet all the requirements of this specification.5.4 ClassificationPolyethylene materials suitable for usein the manufacture of tubing under this specification shall beclassified in accordance with Specification D 3350 and asshown in Table
29、 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 therequirements of this specification shall be designated PE-RT.6. Requirements6.1 WorkmanshipThe tubing shall be homogeneousthroughout and fr
30、ee 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 physicalproperties.6.2 Dimensions and Tolerances:6.2.1 Outside Diameters of TubingThe outside diametersand tolerances shall be as shown
31、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 inaccordance with 7.4 and 7.4.2.6.3 Sustained PressureThe tubing shall not fail, balloon,burst, or weep as defined in Test Method D 159
32、8, 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 Table 6, whendetermined in accordance with 7.6.6.5 Oxidative ResistancePE-RT tubing shall have a mini-mum extrapolated time-to-failure
33、 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 inAppendix X3 provided the following requirementsare met. Bent tubing, with a radius of 6 times the outside6ISO 161-1.TAB
34、LE 1 Required D 3350 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 4F2623082diameter and consisting of a continuous bend length inducingnot less tha
35、n 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 and bend angle is kept throughout the testing period byrigid secures immediately outside the bend. The minimum testduration shall be
36、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. Fittingsare used when a change in direction of 90 or greater and a bend radius ofless than 6 times the outside diameter is needed. The te
37、st procedures in 6.6are intended to evaluate PE-RT tubing installed in tight bend applicationsin accordance with the procedure inAppendix X3. This application appliesto 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 2
38、C) and 50 6 5 % relative humidity for not less than 40h prior to test in accordance with Procedure A of PracticeD 618, for those tests where conditioning is required. In casesof disagreement, the tolerances shall be 61.8F (61C) and62 % relative humidity.7.2 Test ConditionsConduct the test in the sta
39、ndard 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 disagreement, thetolerances shall be 61.8F (61C) and 62 % relative humid-ity.7.3 SamplingA sufficient quantity of tubing, as agree
40、dupon by the purchaser and the seller, shall be selected andtested to determine conformance with this specification. In thecase of no prior agreement, random samples selected by thetesting laboratory shall be deemed adequate.7.3.1 Test SpecimensUnless otherwise specified in thisstandard or as agreed
41、 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 Dimensions and TolerancesUse any length of tubingto determine the dimensions. Measure in accordance with TestMethod D 2122.7.4.1 Outside
42、DiameterMeasure the outside diameter ofthe tubing in accordance with Test Method D 2122. The refereemethod of measurement is to be by circumferential wrap tape.The tolerance for out-of-roundness shall apply only to tubingprior to shipment. Averaging micrometer or vernier calipermeasurements, four (4
43、) maximum and minimum diametermeasurements at any cross section, may be used for qualitycontrol checks if desired.7.4.2 Wall ThicknessMake micrometer measurements ofthe wall thickness in accordance with Test Method D 2122 todetermine the maximum and minimum values. Measure thewall thickness at both
44、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 D 1598 inwater at 73F (23C) and 180F (82.2C) as shown in Table 5.If the optional 140F rating is desired, perform an additionaltest at 140F (60C)
45、in accordance with Table 5. Eachspecimen of tubing shall be at least five times the nominaldiameter in length and not less than 12 in. (25 cm) or more than3.0 ft (91 cm) between end closures. Maintain the specimens atthe pressures indicated for the appropriate temperatures for aperiod of 1000 h. Fai
46、lure 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 six additional specimens at that temperature. Failure of oneof six specimens tested at either temperature in retest consti-t
47、utes failure in the test. Failure of the tubing shall be defined inaccordance with Test Method D 1598.7.6 Burst PressureDetermine the sample complies withthe minimum burst pressure requirements by testing at leastfive specimens in accordance with Test Method D 1599Method B. The pressure values are g
48、iven 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 F 2023. The test fluid shall be preparedin accordance with 9.1.1 of Test Method F 2023. The extrapo-lated time-to-failure shall be calculated in
49、 accordance with13.3 of Test Method F 2023.7.7.1 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 D 1598, except for the following: Test at least sixspecimens, from randomly selected specimens assembled perthe manufacturer
