ASTM_A_978_-_A_978M_-_08_2013.pdf

Designation:A978/A978M08(Reapproved 2013)Standard Specification forComposite Ribbed Steel Pipe,Precoated and PolyethyleneLined for Gravity Flow Sanitary Sewers,Storm Sewers,andOther Special Applications1This standard is issued under the fixed designation A978/A978M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers composite ribbed steel pipe,precoated and polyethylene lined intended for use for gravityflow sanitary sewers,storm sewers,and other special applica-tions such as water transmission pipe,rehabilitation pipe,slipline pipe,and irrigation pipe where extra corrosion andabrasion resistance are required.The steel sheet used in thefabrication of the pipe has a polymer coating over a metalliccoating of zinc on both sides.In addition,as the pipe is beingfabricated,the ribs are filled with polyethylene and then apolyethylene liner is extruded onto the interior surface.1.2 The exterior polymer precoating provides extra protec-tion of the steel against soilside corrosion,in addition to thatprovided by the metallic coating,and also provides a dielectricbarrier for cathodic protection.The interior polymer precoatingprovides an adhesive layer between the galvanized steel andthe polyethylene lining.The applied lining provides internalprotection against corrosion,erosion,and abrasion.By fillingthe rib which has a deltoid shape(smaller at the opening in thepipe wall than at the bottom of the rib),the polyethylene ismechanically connected to the pipe wall and the polyethyleneliner is then thermally bonded to the filled rib.1.3 This specification does not include requirements forbedding,backfill,or the relationship between earth cover loadand sheet thickness of the pipe.Experience has shown that thesuccessful performance of this product depends upon theproper selection of sheet thickness,type of bedding andbackfill,controlled manufacture in the plant,and care in theinstallation.The installation procedure is described in PracticeA798/A798M.1.4 This specification is applicable to orders in eitherinch-pound units as A978,or in SI units as A978M.Inch-pound units and SI units are not necessarily equivalent.SI unitsare shown in brackets in the text for clarity,but they are theapplicable values when the material is ordered to A978M.1.5 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:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA153/A153M Specification for Zinc Coating(Hot-Dip)onIron and Steel HardwareA307 Specification for Carbon Steel Bolts,Studs,andThreaded Rod 60 000 PSI Tensile StrengthA563 Specification for Carbon and Alloy Steel NutsA563M Specification for Carbon andAlloy Steel Nuts(Met-ric)A742/A742M Specification for Steel Sheet,Metallic Coatedand Polymer Precoated for Corrugated Steel PipeA780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsA796/A796M Practice for Structural Design of CorrugatedSteel Pipe,Pipe-Arches,and Arches for Storm and Sani-tary Sewers and Other Buried ApplicationsA798/A798M Practice for Installing Factory-Made Corru-gated Steel Pipe for Sewers and Other ApplicationsA902 Terminology Relating to Metallic Coated Steel Prod-uctsA926 Test Method for Comparing the Abrasion Resistanceof Coating Materials for Corrugated Metal PipeA929/A929M Specification for Steel Sheet,Metallic-Coatedby the Hot-Dip Process for Corrugated Steel PipeB633 Specification for Electrodeposited Coatings of Zinc onIron and Steel1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.17 on Corrugated Steel Pipe Specifications.Current edition approved Nov.1,2013.Published November 2013.Originallyapproved in 1997.Last previous edition approved in 2008 as A978/A978M-08.DOI:10.1520/A0978_A0978M-08R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 B695 Specification for Coatings of Zinc Mechanically De-posited on Iron and SteelC443 Specification for Joints for Concrete Pipe andManholes,Using Rubber GasketsC443M Specification for Joints for Concrete Pipe andManholes,Using Rubber Gaskets(Metric)D638 Test