ASTM_F_336_-_02_2009.pdf

Designation:F33602(Reapproved 2009)Standard Practice forDesign and Construction of Nonmetallic Enveloped Gasketsfor Corrosive Service1This standard is issued under the fixed designation F336;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the designs,sizes,classifications,and construction of enveloped gaskets for severe corrosiveapplications.The envelope serves as the corrosion resistantmember of the composite gasket and is a nonmetallic materialsuch as polytetrafluoroethylene,PTFE,or related materials.The inserts are nonmetallic gasketing materials with or withoutmetal reinforcement.Other types of composite gaskets arecovered in Classification F868.1.2 ThisstandardisbaseddirectlyuponANSIB16.211992;for that reason units are as ANSI stated ininches.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:2D3294 Specification for Polytetrafluoroethylene(PTFE)Resin Molded Sheet and Molded Basic ShapesD3308 Specification for PTFE Resin Skived TapeF104 Classification System for Nonmetallic Gasket Materi-alsF112 Test Method for Sealability of Enveloped GasketsF868 Classification for Laminated Composite Gasket Mate-rials2.2 Other Document:ASME B16.21 1992 Nonmetallic Flat Gaskets for PipeFlanges33.Significance and Use3.1 The gaskets covered by this practice can be used on,butare not limited to,equipment constructed of the followingmaterials:(a)stoneware,(b)glass and glass-lined,(c)tantalum(solid and lined),(d)titanium(solid and lined or clad),(e)zirconium(solid and lined or clad),(f)silver(solid and lined),and(g)nickel and nickel alloys(solid and clad).3.2 The gaskets provided for herein are for the following:(a)pipe flanges(flat or raised face),(b)vessel nozzles,(c)circular openings in vessels in excess of 12 in.(305 mm)diameter,and(d)oval openings in vessels.4.Sizes4.1 The gasket nominal size listed in inches,Table 1,will bethe same as used on the following pipe flanges in accordancewith ASME B16.21 1992:Pipe SizeASME12to 24 in.B16.21 1992,Table 5 and 6Over 24 in.B16.21 1992,Table 1 and 24.2 Commercial dimensional tolerances apply,unless other-wise agreed upon between the seller and the purchaser.5.Materials and Manufacture5.1 The gaskets covered by this practice shall be made ofnonmetallic materials,except when a metal support is desiredin the insert.5.2 Materials should be selected,both for inserts andenvelopes,that will withstand the conditions under which theyare to be subjected in service.5.3 A list of reference literature for determining materialsuitability in corrosive environments is available from ASTMHeadquarters.It is entitled,“Materials of Construction ASTMF-3.50.10 Corrosion Data Literature.”45.4 The design of the envelope classifies the envelopedgasket as follows:5.4.1 Split,knife cut(Fig.1 and Fig.2).5.4.2 Machined(Fig.3 and Fig.4).1This practice is under the jurisdiction ofASTM Committee F03 on Gaskets andis the direct responsibility of Subcommittee F03.10 on Composite Gaskets.Current edition approved May 1,2009.Published May 2009.Originallyapproved in 1971.Last previous edition approved in 2002 as F336 02.DOI:10.1520/F0336-02R09.2For 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 Society of Mechanical Engineers,Three ParkAvenue,New York,NY 10016.4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F03-1001.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.4.3 Tape Folded,made endless by joining tape ends witha heat sealing procedure(Fig.5 and Fig.6).6.Insert Classification56.1 ConstructionsTwo insert constructions are covered asfollows:6.1.1 Construction 1Single layer.6.1.2 Construction 2Multiple layer.6.2 GradesMultiple layer constructions include the fol-lowing:6.2.1 Grade 1Two layers,any combination of nonmetallichomogenous materials.6.2.2 Grade 2Three layers,any combination of nonme-tallic homogenous materials.6.2.3 Grade 3,Three layers,the two outer layers nonmetal-lic homogenous materials,the inner layer(core)metallic.6.3 TypeThis classification covers insert material types asfollows:5See Fig.1 through Fig.6.TABLE 1 Nominal Gasket SizesANOTE1Refer to Fig.1 through Fig.6 for explanation of gasketcomponent details.NOTE2Split design