ASTM_F_690_-_86_2003e2.pdf

Designation:F 690 86(Reapproved 2003)e2An American National StandardStandard Practice forUnderground Installation of Thermoplastic Pressure PipingIrrigation Systems1This standard is issued under the fixed designation F 690;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(e)indicates an editorial change since the last revision or reapproval.e1NOTEKeywords editorially added in November 2003.e2NOTEEditorial changes were made throughout in December 2004.1.Scope1.1 This practice covers general and basic procedures re-lated to the proper installation of thermoplastic,flexible,pressure piping,36 in.nominal size and smaller,for under-ground irrigation systems.Because there is considerable vari-ability in end-use requirements,soil conditions,and thermo-plastic piping characteristics,it is the intent of this practice tooutline general objectives and basics of proper installation andto provide pertinent references,rather than to prescribe detailedinstallation procedures.1.2 This practice should not be used for installing thermo-plastic underground sewer,drain,potable water,conduit,or gasservice piping.1.3 The values stated in inch-pound units are to be regardedas the standard.Values in parentheses are mathematical con-versions to SI that are provided for informational purposes onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety problems,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:2D 2487 Test Method for Classification of Soils for Engi-neering Purposes(Unified Soil Classification System)D 2488 Practice for Description and Identification of Soils(Visual-Manual Procedure)F 402 Practice for Safe Handling of Solvent Cements,Primers,and Cleaners Used for Joining Thermoplastic Pipeand Fittings3.Joints and Connections3.1 Joints and connections shall be assembled to withstandthe design working pressure for the pipeline without leakage,internal restriction or obstruction,which could reduce linecapacity below design requirements.3.2 All joining materials shall be of composition that willnot damage the pipe and shall be recommended for use at thedesign pressure for the pipeline.Consult the manufacturer fordesign and installation recommendations and refer to PracticeF 402.3.3 When steel or other metallic joining materials,subject tocorrosion,are used in the line,they shall be adequatelyprotected by wrapping or coating with high quality corrosionpreventatives.Wrapping or coatings that are applied on metal-lic surfaces should not be applied on plastic pipes and fittingsunless it is first established by consulting the piping manufac-turer that they have no detrimental effect on the plastic.3.4 Joining specifications are listed under X1.1.3.3.5 Manufacturers of joining materials should be consultedfor specific assembly instructions not covered by existingspecifications.When requesting information,the intended ser-vice application should be defined.4.Trench Preparation4.1 Trench DepthIn stable granular soils,which tend to berelatively smooth and free of all rocks and debris larger than12in.(13 mm)in sizes,excavation may proceed directly to finalgrade.Where rocks of other protrusions are encountered whichmay cause point loading on the pipe,the trench bottom shouldbe overexcavated to permit installation of proper bedding(seeSection 5).4.2 Trench WidthThe width of the trench at any pointbelow the top of the pipe should be established with attentiongiven to these considerations:1This practice 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 Aug.10,2003.Published September 2003.Originallyapproved in 1980.Last previous edition approved in 1994 as F 690 84(1994).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.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.4.2.1 The wider the trench at the top of the pipe,the greaterthe earth load imposed on the pipe until the prism load has beenachieved.4.2.2 Trench width should allow sufficient and safe workingroom for proper alignment and assembly of the joints.Gener-ally,a trench width at the top of the pipe of about 2 ft(600 mm)wider than the pipe diameter is adequate.However,for pipewith an 18-in.(457-mm)diameter and larger in a vertical-walled trench,a clearance of 3 ft(1 m)wider than the nominalpipe size may be needed.For sl