ASTM_A_674_-_10_2014.pdf

Designation:A67410(Reapproved 2014)Standard Practice forPolyethylene Encasement for Ductile Iron Pipe for Water orOther Liquids1This standard is issued under the fixed designation A674;the number immediately following the designation indicates 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.Scope1.1 This practice covers materials and installation proce-dures for polyethylene encasement to be applied to under-ground installations of ductile iron pipe.It may also be used forpolyethylene encasement of fittings,valves,and other appur-tenances to ductile iron pipe systems.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 Important SI values are provided in brackets.Also,certain important SI values appear without brackets or paren-theses.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD882 Test Method for Tensile Properties of Thin PlasticSheetingD1709 Test Methods for Impact Resistance of Plastic Filmby the Free-Falling Dart MethodD1922 Test Method for Propagation Tear Resistance ofPlastic Film and Thin Sheeting by Pendulum MethodD4976 Specification for Polyethylene Plastics Molding andExtrusion Materials2.2 ANSI/AWWA Standards:3C 600 Installation of Ductile Iron Water Mains and TheirAppurtenancesC 105 A21.5 Polyethylene Encasement for Ductile-IronPipe Systems3.Terminology3.1 Definitions:3.1.1 high-density,cross-laminated polyethylene filmFilmextruded from virgin high-density polyethylene raw material,which is then molecularly oriented by stretching.The finalproduct is then formed by two single-ply layers of the film thatare then laminated together with their orientations at 90 to oneanother using molten,high-density,virgin resin.3.1.2 linear low-density polyethylene filmFilm extrudedfrom virgin linear low-density polyethylene raw material.3.1.3 polyethylene encasementpolyethylene material,intube or sheet form,that is used to encase ductile iron pipe.3.1.4 securing overlapany one of various methods ofholding polyethylene encasement in place at the point ofoverlap until backfilling operations are completed.This may beaccomplished with adhesive tape or plastic tie straps.4.Requirements4.1 Materials:4.1.1 GeneralAll films shall be manufactured of virginpolyethylene material as non-virgin polyethylene materialsmay be susceptible to accelerated environmental degradation.4.1.1.1 RequirementsThe sections that follow list thematerial requirements for linear low-density and high-density,cross-laminated polyethylene film.In each category,the filmshall meet all of the listed requirements.4.1.2 Linear low-density polyethylene filmLinear low-density polyethylene film shall be manufactured of virginpolyethylene material conforming to the requirements ofSpecification D4976 shown in Table 1.4.1.2.1 ThicknessLinear low-density polyethylene filmshall have a minimum thickness of 0.008 in.0.20 mm.1This practice is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.12 on Pipes andTubes.Current edition approved Oct.1,2014.Published October 2014.Originallyapproved in 1972.Last previous edition approved in 2010 as A674-10.DOI:10.1520/A0674-10R14.2For 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 to the standards Document Summary page onthe ASTM website.3Available from American Water Works Association(AWWA),6666 W.QuincyAve.,Denver,CO 80235,http:/www.awwa.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.3 High-density cross-laminated polyethylene filmHigh-density cross-laminated polyethylene film shall be manu-factured of virgin polyethylene material conforming to therequirements of Specification D4976 shown in Table 2.4.1.3.1 ThicknessHigh-density cross-laminated polyethyl-ene film shall have a minimum thickness of 0.004 in.0.10mm.4.2 Tube SizeThe tube size for each pipe diameter shall beas listed in Table 3.4.3 ColorPolyethylene film may be supplied in its naturalcolor,white,black or weather resistant black containing notless than 2%carbon black with a particle diameter of 90 nmor less.A minimum 2%of a hindered-amine ul