1、Designation: F2929 13Standard Specification forCrosslinked Polyethylene (PEX) Tubing of 0.070 in. Wall andFittings for Radiant Heating Systems up to 75 psig1This standard is issued under the fixed designation F2929; the number immediately following the designation indicates the year oforiginal adopt
2、ion or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers 0.070 in. wall thickness cross-linked polyethyl
3、ene (PEX) tubing that is outside diametercontrolled, and intended for non-potable radiant heating appli-cations for pressures up to 75 psig in sizes58 NTS (nominaltubing size) and78 NTS. This specification also includesfittings that are specifically designed for this 0.070 in.-wallPEX tubing. Only 7
4、5-psig relief valves shall be used with thistubing. Included in this specification are requirements and testmethods for material, workmanship, dimensions, burstpressure, hydrostatic sustained pressure, environmental stresscracking, stabilizer functionality, bent-tube hydrostaticpressure, excessive t
5、emperature and degree of crosslinking.Requirements for tubing markings are also given. This tubingdoes not have an oxygen diffusion barrier layer and shall not beused in systems that require a barrier layer. This tubing is notintended for field bending at temperatures above 120F (49C).1.2 The text o
6、f this specification references notes, footnotes,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 standard. T
7、he values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The following safety hazards caveat pertains only to thetest methods portion, Section 7, of this specification:Thisstandard does not purport to address all
8、 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:A269 Specification for S
9、eamless and Welded AusteniticStainless Steel Tubing for General ServiceA276 Specification for Stainless Steel Bars and ShapesA312/A312M Specification for Seamless, Welded, andHeavily Cold Worked Austenitic Stainless Steel PipesB16/B16M Specification for Free-Cutting Brass Rod, Barand Shapes for Use
10、in Screw MachinesB61 Specification for Steam or Valve Bronze CastingsB62 Specification for Composition Bronze or Ounce MetalCastingsB140/B140M Specification for Copper-Zinc-Lead (RedBrass or Hardware Bronze) Rod, Bar, and ShapesB283 Specification for Copper and Copper-Alloy Die Forg-ings (Hot-Presse
11、d)B371/B371M Specification for Copper-Zinc-Silicon AlloyRodB584 Specification for Copper Alloy Sand Castings forGeneral ApplicationsB967/B967M Specification for Copper-Zinc-Tin-BismuthAlloy Rod, Bar and WireD618 Practice for Conditioning Plastics for TestingD792 Test Methods for Density and Specific
12、 Gravity (Rela-tive Density) of Plastics by DisplacementD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tu
13、bing, and FittingsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene PlasticsD2837 Test Method for Obtaining Hydrostatic
14、 Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryE18 Test Methods for Rockwell Hardness of Metallic Ma-terials1This test method is under the jurisdic
15、tion of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 on OlefinBased Pipe.Current edition approved May 1, 2013. Published June 2013. DOI: 10.1520/F292913Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428
16、-2959. United States1F412 Terminology Relating to Plastic Piping SystemsF2657 Test Method for Outdoor Weathering Exposure ofCrosslinked Polyethylene (PEX) Tubing2.2 ANSI Standard:2B36.10 Standards Dimensions of Steel Pipe (IPS)2.3 Federal Standard:3FED-STD-123 Marking for Shipment (Civil Agencies)2.
17、4 Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.5 ISO Standards:4ISO 1167 Thermoplastics pipes, fittings and assemblies forthe conveyance of fluids - Determination of the resistanceto internal pressure - Part 1: General methodISO R 161-1690 Pipes of Plastic Materials for the Trans
18、portof Fluids (Outside Diameters and Nominal Pressures) Part1, Metric Series2.6 PPI Standards:5PPI TR-3 Policies and Procedures for Developing Recom-mended Hydrostatic Design Basis (HDB), Strength De-sign Basis (SDB), Pressure Design Basis (PDB) andMinimum Required Strength (MRS) Ratings for Thermo-
19、plastic Piping Materials or PipePPI 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 Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-no
20、logy F412, and abbreviations are in accordance with Termi-nology D1600, unless otherwise specified. The abbreviation forcrosslinked polyethylene is PEX.3.2 Definitions of Terms Specific to This Standard:3.2.1 crosslinked polyethylene, nmolecular polyethylenechains chemically connected through irradi
21、ation with high-energy electron beams, or chemical agents such as organicperoxides or silanes.3.2.2 hydrostatic design stress (HDS), nthe estimatedmaximum tensile stress the material is capable of withstandingcontinuously with a high degree of certainty that failure of thetube will not occur. This s
22、tress is circumferential when internalhydrostatic water pressure is applied. The HDS is equal to thehydrostatic design basis (HDB) times the design factor (DF)for water. For this standard, the design factor is equal to 0.50.HDS 5 HDB 3DF5 HDB 30.05 (For this standard) (1)3.2.3 hydrostatic design bas
23、is (HDB)one of a series ofestablished stress values (specified in Test Method D2837) fora plastic compound obtained by categorizing the long-termhydrostatic strength determined in accordance with TestMethod D2837.3.2.3.1 DiscussionA listing of HDB and HDS values arecontained in PPI publication PPI T
24、R4.3.2.4 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.3.2.4.1 DiscussionIf both58 NTS and78 NTS tubing areused in the same system, the pressure rating of the system isli
25、mited to the pressure rating of the78 NTS tubing.3.2.5 relation between dimensions, hydrostatic designstress, and pressure ratingthe following expression, com-monly known as the ISO equation, 6 is used in this specifica-tion to relate dimensions, hydrostatic design stress, and pres-sure rating:2SP 5
26、 (DOt) 2 1or2SP 5 R 2 1 (2)where:S = hydrostatic design stress, psi (MPa),P = pressure rating, psi (or MPa),DO= average outside diameter, in. (mm),t = minimum wall thickness, in. (mm), andR = dimension ratio, DR.3.2.6 tubing material designation codeThe tubing mate-rial designation code shall consis
27、t of the abbreviation for thetype of plastic (PEX) followed by four Arabic digits thatdescribe short-term properties in accordance with applicableASTM standards and as shown in Table 1.3.2.6.1 DiscussionThe first digit is for chlorine resistance,which is not applicable for radiant tubing application
28、s, but ismentioned here for information purposes.3.2.6.2 DiscussionThe second digit is for demonstratedUV resistance of PEX material when tested in accordance withTest Method F2657. For radiant heating, it shall be one of theclassification digits from Table 1 for the nominal exposure timeperiod from
29、 Table 1 of Test Method F2657 where the UV-exposed samples meet the requirement of 7.10 StabilizerFunctionality. The UV resistance shall be demonstrated onrepresentative pipe samples for the original validation of pipe2Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th F
30、loor, New York, NY 10036, http:/www.ansi.org.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.4Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, CP 56,
31、 CH-1211 Geneva 20, Switzerland, http:/www.iso.org.5Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.TABLE 1 PEX Tubing Material Designation Code CellsProperty Standard 0 1 2 3 6 8Chlorine Resistant Not applicable . . . . .Minimum
32、UVResistanceNot tested or rated 1 month 3 months 6 months . .HDS for water at73F, psi. . . . 630 800F2929 132made from a particular PEX material, that material being thecombination of PEX resin and its additive system.3.2.6.3 DiscussionThe last two digits are the hydrostaticdesign stress for water a
33、t 73F (23C) in units of 100 psi withany decimal figures dropped. Where the hydrostatic designstress code contains less than two figures, a zero is used beforethe number. Thus, a complete material designation code forPEX tubing shall consist of the three letters “PEX” and fourdigits.3.2.7 0.070 in. w
34、all radiant heating systemPEX tubingwith a 0.070 in. thickness, and corresponding fittings designedfor 0.070 in. wall tubing, used for radiant heating applications.4. Tubing Classification4.1 GeneralThis specification covers tubing for 0.070 in.wall radiant heating that is classified using the tubin
35、g materialdesignation code for PEX tubing.5. Materials5.1 TubingCrosslinked polyethylene tubing, meeting therequirements of this specification, is primarily defined bymeans of three criteria, namely, (1) nominal density, (2) degreeof crosslinking, and (3) long-term strength tests. There is astrong c
36、orrelation between nominal density and results ofshort-term strength tests.5.1.1 Basic MaterialsPEX tubing shall be made frompolyethylene compounds, which have been crosslinked byperoxides, Azo compounds, or silane compounds in extrusion,or by electron beam after extrusion, or by other means suchtha
37、t the tubing meets the performance requirements of Section6. For the use temperatures that the tubing will be marked for,the materials, procedure for mixing, and the process forcrosslinking shall result in a product with long-term hydrostaticdesign basis (HDB) ratings equal to or better than 1250 ps
38、i at73F (23C), 1000 psi at 120F (49C), and 800 psi at 180F(76C), when determined in accordance with procedures noless restrictive than those of PPI TR-3. The PEX material HDBvalues shall be listed in PPI TR-4. See Appendix X1 foradditional information on PPI hydrostatic stress ratings.NOTE 1HDB valu
39、es at 73F (23C) and 180F (76C) are published inPPI TR-4. The HDB at an intermediate temperature, such as 120F (49C),is determined by arithmetic interpolation.NOTE 2Tubing produced by crosslinking by peroxides, Azocompounds, or silane compounds in extrusion, or by electron beam afterextrusion have me
40、t the requirements of Section 6. There are several otherprocesses for producing crosslinked polyethylene tubing. However, eachprocess must be established as meeting the requirements of this specifi-cation.5.2 FittingsThe fittings shall be made from one of thefollowing metals:5.2.1 Cast Copper Alloys
41、Cast copper alloy fittings shallbe made from material meeting the requirements of one of thefollowing:(1) Specification B61, copper alloy UNS C92200,(2) Specification B62, copper alloy UNS No. C83600, or(3) Specification B584, copper alloy UNS Nos. C84400,C83800, or C87850.5.2.2 Machined BrassMachin
42、ed brass fittings shall bemade from material meeting the requirements of one of thefollowing:(1) Specification B16/B16M, Copper Alloy UNS No.C36000,(2) Specification B140/B140M copper alloy UNS No.C31400,(3) Specification B371/B371M Copper Alloy UNS No.C69300, or(4) Specification B967/B967M copper a
43、lloy UNS No.C49260 or C49340.5.2.3 Forged BrassForged brass fittings shall be madefrom material meeting the requirements of Specification B283,Copper Alloy UNS Nos. C27450, C35330, C36500, C37700,C46400, C48600, C49260, C49340, or C69300.5.2.4 Stainless SteelStainless steel fittings shall be madefro
44、m material meeting requirements of one of the following:(1) Specification A312/A312M, stainless steel alloy 304,304L, 316 or 316L, (UNS Nos. S30400, S30403, S31600 orS31603),(2) Specification A269, stainless steel alloy 304, 304L,316, 316L (UNS Nos. S30400, S30403, S31600 or S31603), or(3) Specifica
45、tion A276, Stainless steel alloy 304, 401L,316, or 316L (UNS Nos. S30400, S30403, S31600 or S31603)6. Requirements6.1 WorkmanshipThe tubing shall be homogeneousthroughout and free of visible cracks, holes, foreign inclusions,or other defects. The pipe shall be as uniform as commerciallypracticable i
46、n color, opacity, density, and other physical prop-erties.6.2 Out-of RoundnessThe maximum out-of roundnessrequirements, shown in Table 2 for tubing, apply to the averagemeasured diameter. Tubing shall be measured prior to coiling.6.3 Dimensions and Tolerances:6.3.1 Outside DiametersThe outside diame
47、ters and toler-ances of the tubing shall be as shown in Table 2, whenmeasured in accordance with 7.4 and 7.4.1.6.3.2 Wall ThicknessThe wall thickness and tolerancesshall be as shown in Table 3, when measured in accordancewith 7.4 and 7.4.2. This specification covers PEX tubing in twosizes,58 NTS (no
48、minal tubing size) and78 NTS. The minimumwall thickness is 0.070 in. (1.78 mm), as shown in Table 3.6.4 DensityWhen determined in accordance with 7.5, thecrosslinked polyethylene tubing material shall have a minimumdensity of 0.926 g/cm3.TABLE 2 Outside Diameters and Tolerances for 0.070 in.-WallPEX
49、 TubingNominal TubingSizeAverage OutsideDiameterTolerances forAverageDiameterOut-of-RoundnessAin. (mm) in. (mm) in. (mm)58 DR10.70.750 (19.05) 0.004 (0.10) 0.016 (0.40)78 DR14.31.000 (25.40) 0.004 (0.10) 0.016 (0.40)AThe Out-of-Roundness specification applies only to tubing prior to coiling.F2929 1336.5 Hydrostatic Sustained Pressure StrengthThe tubingand fittings (tested as assemblies) shall not fail, balloon, burst,or weep as defined in Test Method D1598, at the test pressuresshown in Table 4 when tested in accord
