1、Designation:D 2666 96aAn American National StandardStandard Specification forPolybutylene(PB)Plastic Tubing1This standard is issued under the fixed designation D 2666;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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 covers polybutylene(PB)tubing thatis outside diameter controlled,made in standard thermoplastictubing dimensi
3、on ratios and pressure rated for water(seeAppendix).Included are criteria for classifying PB plastictubing;a system of nomenclature for PB plastic tubing;andrequirements and test methods for materials,workmanship,dimensions,sustained pressure,and burst pressure.Methods ofmarking are also given.1.2 T
4、he text 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 the sta
5、ndard.The values given in parentheses are providedfor information purposes only.1.4The following safety hazards caveat pertains only tothe test methods portion,Section 7,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the
6、 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:D 618 Practice for Conditioning Plastics for Testing2D 1598 Test Method for Time-to-Failure
7、 of Plastic PipeUnder Constant Internal Pressure3D 1599 Test Method for Short-Time Hydraulic Failure Pres-sure of Plastic Pipe,Tubing,and Fittings3D 1600 Terminology for Abbreviated Terms Relating toPlastics2D 1603 Test Method for Carbon Black in Olefin Plastics2D 1708 Test Method for Tensile Proper
8、ties of Plastics byUse of Microtensile Specimens2D 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and Fittings3D 2581 Specification for Polybutylene(PB)Plastics Mold-ing and Extrusion Materials4D 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe Materi
9、als3F 412 Terminology Relating to Plastic Piping Systems3F 699 Practice for Accelerated Conditioning of Polybuty-lene Pipe and Tubing for Subsequent Quality ControlTesting32.2Federal Standard:Fed.Std.No.123 Marking for Shipment(Civil Agencies)52.3Military Standard:MIL-STD-129 Marking for Shipment an
10、d Storage52.4NSF Standards:Standard No.14 for Plastic Piping Components and RelatedMaterials6Standard No.61 for Drinking Water System ComponentsHealth Effects63.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F 412,and abbreviations are in accordance with Ter-minology D 160
11、0,unless otherwise specified.The abbreviationfor polybutylene plastic is PB.3.2 Definitions of Terms Specific to This Standard:3.2.1hydrostatic design stressthe estimated maximumtensile stress the material is capable of withstanding continu-ously with a high degree of certainty that failure of the p
12、ipewill not occur.This stress is circumferential when internalhydrostatic water pressure is applied.3.2.2 relation between dimensions,hydrostatic designstress,and pressure ratingthe following expression,com-monly known as the ISO equation,7is used in this specificationto relate dimensions,hydrostati
13、c design stress,and pressurerating:2S/P 5 D0/t!2 1(1)1This specification is under the jurisdiction ofASTM Committee F-17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 onOlefin-Based Pipe.Current edition approved Sept.10,1996.Published November 1996.Originallypublis
14、hed as D 2666 67 T.Last previous edition D 2666 96.2Annual Book of ASTM Standards,Vol 08.01.3Annual Book of ASTM Standards,Vol 08.04.4Annual Book of ASTM Standards,Vol 08.02.5Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.6A
15、vailable from the National Sanitation Foundation,P.O.Box 1468,Ann Arbor,MI 48106.7ISO R161-1960,Pipes of Plastics Materials for the Transport of Fluids(OutsideDiameters and Nominal Pressures)Part 1,Metric Series.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 194
16、28-2959,United States.where:S=hydrostatic design stress,MPa(or psi),P=pressure rating,MPa(or psi),D0=average outside diameter,mm(or in.),andt=minimum wall thickness,mm(or in.).3.2.3 standard dimension ratio(SDR)the ratio of outsidediameter to wall thickness.For PB tubing,it is calculated bydividing the average outside diameter of the tubing in milli-metres or in inches by the minimum wall thickness in milli-metres or inches.If the wall thickness calculated by thisformula is less than 0.062 in.(1
