1、Designation: F2929 17 An American National StandardStandard 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 indic
2、ates the year oforiginal adoption 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. Scope*1.1 This specification covers 0.070 in. wall t
3、hickness cross-linked polyethylene (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
4、.070 in.-wallPEX tubing. Only maximum 75-psig relief valves shall be usedwith this tubing. Included in this specification are requirementsand test methods for material, workmanship, dimensions, burstpressure, hydrostatic sustained pressure, environmental stresscracking, stabilizer functionality, ben
5、t-tube hydrostaticpressure, excessive temperature and degree of crosslinking.Requirements for tubing markings are also given. This speci-fication incorporates an optional middle or outer oxygen barrierlayer. This tubing is not intended for field bending at tempera-tures above 120 F (49 C).1.2 The te
6、xt of 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 standar
7、d. The 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 addres
8、s all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety, health, andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.5 This international standard was developed i
9、n accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2
10、.1 ASTM Standards:A269/A269M Specification for Seamless and Welded Aus-tenitic Stainless Steel Tubing for General ServiceA276/A276M Specification for Stainless Steel Bars andShapesA312/A312M Specification for Seamless, Welded, andHeavily Cold Worked Austenitic Stainless Steel PipesB16/B16M Specifica
11、tion for Free-Cutting Brass Rod, Barand Shapes for Use 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 Specificatio
12、n for Copper and Copper-Alloy Die Forg-ings (Hot-Pressed)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 Plastic
13、s for TestingD792 Test Methods for Density and Specific 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 Resista
14、nce to Short-Time HydraulicPressure of Plastic Pipe, Tubing, 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 Ethyl
15、ene PlasticsD2837 Test Method for Obtaining Hydrostatic Design Basis1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.61 on Water.Current edition approved Dec. 1, 2017. Published February 2018. Originally
16、approved in 2013. Last previous edition approved in 2013 as F292913. DOI:10.1520/F292917.*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. United StatesThis international standard was d
17、eveloped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1for Thermoplast
18、ic 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-terialsF412 Terminology Relating to Plastic Piping SystemsF1281 Specificat
19、ion for Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene (PEX-AL-PEX)Pressure PipeF2657 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 Shipmen
20、t (Civil Agencies)2.4 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 Mat
21、erials for the Transportof Fluids (Outside Diameters and Nominal Pressures) Part1, Metric SeriesISO 17455 Plastics piping systems - Multilayer pipes -Determination of the oxygen permeability of the barrierpipe2.6 PPI Standards:5PPI TR-3 Policies and Procedures for Developing Recom-mended Hydrostatic
22、 Design Basis (HDB), Strength De-sign Basis (SDB), Pressure Design Basis (PDB) andMinimum Required Strength (MRS) Ratings for Thermo-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 Str
23、ength (MRS) Ratingsfor Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412, and abbreviations are in accordance with Termi-nology D1600, unless otherwise specified.The abbreviation forcrosslinked polyethylene is PEX.3.2 Definitions
24、of Terms Specific to This Standard:3.2.1 barrier layer, na very thin polymeric film within thetube wall or around the circumference of the tubing, whichprovides a means for greatly reducing the transmission ofoxygen from the atmosphere and into the fluid within the tube.3.2.2 crosslinked polyethylen
25、e, nmolecular polyethylenechains chemically connected through irradiation with high-energy electron beams, or chemical agents such as organicperoxides or silanes.3.2.3 hydrostatic design stress (HDS), nthe estimatedmaximum tensile stress the material is capable of withstandingcontinuously with a hig
26、h degree of certainty that failure of thetube will not occur. This stress 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 HD
27、B 3DF5 HDB 30.05 For this standard! (1)3.2.4 hydrostatic design basis (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 D2837.3.2.4.1 DiscussionA
28、listing of HDB and HDS values arecontained in PPI publication PPI TR-4.3.2.5 hydrostatic strength equivalency (HSE), na pressuretesting evaluation methodology where hydrostatic testing isconducted on PEX tubing that is constructed with a barrierlayer in the middle or outside wall of the tubing, and
29、isconstructed with PEX material that has an established HDB.HSE methodology is applied where the barrier layer reducesthe thickness of the HDB rated PEX material in the wall suchthat the PEX wall thickness excluding the barrier layer(s) isslightly less than 0.070 in. (1.78 mm).3.2.6 HSE-DR, nan iden
30、tifying term for the tubing wherethe minimum PEX wall thickness falls below 0.070 in. (1.78mm), yet the tubing, as constructed, still meets the pressurerating requirements of this specification as demonstrated byHSE evaluation testing.3.2.7 pressure rating (PR)the estimated maximum waterpressure the
31、 tube is capable of withstanding continuously witha high degree of certainty that failure of the tube will not occur.3.2.7.1 DiscussionIf both58 NTS and78 NTS tubing areused in the same system, the pressure rating of the system islimited to the pressure rating of the78 NTS tubing.3.2.8 relation betw
32、een 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 DO t! 2 1or2SP 5 R 2 1 (2)where:S = hydrostatic design stress, psi
33、(MPa),P = pressure rating, psi (or MPa),DO= average outside diameter, in. (mm),t = minimum wall thickness, in. (mm), andR = dimension ratio, DR.2Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.3Available from DLA Document
34、Services, Building 4/D, 700 Robbins Ave.,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil.4Available from International Organization for Standardization (ISO), ISOCentral Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,Geneva, Switzerland, http:/www.iso.org.5Available from P
35、lastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.F2929 1723.2.9 tubing material designation codeThe tubing mate-rial designation code shall consist of the abbreviation for thetype of plastic (PEX) followed by four Arabic digits thatdescribe short-
36、term properties in accordance with applicableASTM standards and as shown in Table 1.3.2.9.1 DiscussionThe first digit is for chlorine resistance,which is not applicable for radiant tubing applications, but ismentioned here for information purposes.3.2.9.2 DiscussionThe second digit is for demonstrat
37、edUV 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 Table 1 of Test Method F2657 where the UV-exposed samples meet the requirement of 7.10 StabilizerFun
38、ctionality. The UV resistance shall be demonstrated onrepresentative pipe samples for the original validation of pipemade from a particular PEX material, that material being thecombination of PEX resin and its additive system.3.2.9.3 DiscussionThe last two digits are the hydrostaticdesign stress for
39、 water at 73 F (23 C) 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.3.2.10
40、0.070 in. wall 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 usin
41、g the tubing 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 i
42、s astrong correlation between nominal density and results ofshort-term strength tests.5.1.1 Basic MaterialsPEX tubing, exclusive of optionalbarrier layer, shall be made from polyethylene compounds,which have been crosslinked by peroxides,Azo compounds, orsilane compounds in extrusion, or by electron
43、 beam afterextrusion, or by other means such that the tubing meets theperformance requirements of Section 6. For the use tempera-tures that the tubing will be marked for, the materials,procedure for mixing, and the process for crosslinking shallresult in a product with long-term hydrostatic design b
44、asis(HDB) ratings equal to or better than 1250 psi at 73 F (23 C),1000 psi at 120 F (49 C), and 800 psi at 180 F (82 C), whendetermined in accordance with procedures no less restrictivethan those of PPI TR-3. See Appendix X1 for additionalinformation on PPI hydrostatic stress ratings.NOTE 1HDB value
45、s at 73 F (23 C) and 180 F (82 C) may bepublished in PPI TR-4. The HDB at an intermediate temperature, such as120 F (49 C), is determined by arithmetic interpolation.NOTE 2Tubing produced by crosslinking by peroxides, Azocompounds, or silane compounds in extrusion, or by electron beam afterextrusion
46、 have met 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.5.1.2 Barrier LayerA barrier layer to reduce oxygendiffusion is optional for this tubin
47、g. Tubing incorporating anoptional layer shall meet the requirements of 6.14 and 6.15 andall other requirements of this specification.5.1.2.1 Polymeric oxygen barrier layer materials shall becompatible with PEX and meet the requirements of thisspecification.NOTE 3EVOH (Ethylene vinyl alcohol), which
48、 is the typical materialused for the barrier layer, is defined by the mole % ethylene content: lowerethylene content grades have higher oxygen barrier properties.5.1.2.2 Bonding or tie layer(s) material (if present) shall becompatible with both PEX and barrier layer providing forpermanent bonding be
49、tween layers to meet layer adhesionrequirements of 6.14.Abonding/tie layer containing a colorantshall be acceptable.5.1.2.3 All barrier tubing sizes in this specification arepressure rated equivalent to DR of the PEX tubing. Tubing thathas PEX material minimum wall thickness equal to or greaterthan 0.070 in. (1.78 mm) is pressure rated as that DR using thedesign equation (3.2.8), and is marked with that DR. Tubinghaving a barrier layer that has PEX material minimum wallthickness that is less than 0.070 in. (1.78 mm) is pressure
