1、Designation: F 336 02Standard Practice forDesign and Construction of Nonmetallic Enveloped Gasketsfor Corrosive Service1This standard is issued under the fixed designation F 336; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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.1. Scope1.1 This practice covers the designs, sizes, classifications,and construction of enveloped gaskets for severe cor
3、rosiveapplications. 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 gaske
4、ts arecovered in Classification F 868.1.2 This standard is based directly upon ANSIB16.211992; 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 stand
5、ard 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:D 3294 Specification for Polytetrafluoroethylene (PTFE)Resin Molded Sheet and Molded Basic Shapes2D 3308 Specification for PTFE
6、Resin Skived Tape2F 104 Classification System for Nonmetallic Gasket Mate-rials3F 112 Test Method for Sealability of Enveloped Gaskets3F 868 Classification for Laminated Composite Gasket Ma-terials32.2 Other Document:ASME B16.21 1992 Nonmetallic Flat Gaskets for PipeFlanges43. Significance and Use3.
7、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 an
8、d 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 gask
9、et nominal size listed in inches, Table 1, will bethe same as used on the following pipe flanges in accordancewith ASME B16.21 1992:Pipe Size ASME12 to 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 be
10、tween 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
11、 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.”55.4 The design of the envelope classifie
12、s the envelopedgasket as follows:5.4.1 Split, knife cut (Fig. 1 and Fig. 2).5.4.2 Machined (Fig. 3 and Fig. 4).5.4.3 Tape Folded, made endless by joining tape ends witha heat sealing procedure (Fig. 5 and Fig. 6).1This practice is under the jurisdiction of ASTM Committee F03 on Gaskets andis the dir
13、ect responsibility of Subcommittee F 03.10 on Composite Gaskets.Current edition approved October 10, 2002. Published October 2002. Originallypublished as F 336 71. Last previous edition F 336 97.2Annual Book of ASTM Standards, Vol 08.02.3Annual Book of ASTM Standards, Vol 09.02.4Available from Ameri
14、can Society of Mechanical Engineers, Three ParkAvenue, New York, NY 10016.5Supporting data are available from ASTM Headquarters. Request RR: F3-1001.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Insert Classification66.1 Constru
15、ctionsTwo 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 nonmetal-lic homogenous materials.6.2.2 Grade 2Three layers, any combinat
16、ion 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:6.3.1 NonmetallicAny recognized nonmetallic gasket ma-terial in accordance
17、with Classification, F104 taking intoconsideration limitations with regard to temperature and pres-sure.6.3.2 MetallicInner layer (core) metallic material in Con-struction 2, Grade 3.6See Fig. 1 through Fig. 6.TABLE 1 Nominal Gasket SizesANOTE 1Refer to Fig. 1 through Fig. 6 for explanation of gaske
18、tcomponent details.NOTE 2Split design inserts not to be smaller than nominal pipe size.NOTE 3Inside diameter of folded and machined design envelopes willadjoin the insert inside diameter assuring noninterference with flowthrough pipe.NOTE 4Full face gaskets shall have envelope outside diameter samea
19、s ring gasket outside diameter.NOTE 5Sizes 14 in. (356 mm) and larger may be made frommachined envelopes depending upon material shape availability.Insert (2) (See Note 1) Envelope (1) (See Note 1)NominalPipeSize, in.II. InsideDiameter(B)III. FullFaceOutsideDiameter(D)IV. FlatRingGasketOutsideDiamet
20、er(C)V. (EachSide)ThicknessVI. InsideDiameter(A)VII. OutsideDiameter (C)in. in. in. in. in. in.12 0.84 3.50 1.88 0.015 0.50 1.8834 1.06 3.88 2.25 0.015 0.75 2.251 1.31 4.25 2.62 0.020 1.00 2.62114 1.66 4.63 3.00 0.020 1.25 3.00112 1.91 5.00 3.38 0.020 1.50 3.382 2.38 6.00 4.12 0.020 2.00 4.12212 2.8
21、8 7.00 4.88 0.020 2.50 4.883 3.50 7.50 5.38 0.020 3.00 5.38312 4.00 8.50 6.38 0.020 3.50 6.384 4.50 9.00 6.88 0.020 4.00 6.885 5.56 10.00 7.75 0.020 5.00 7.756 6.62 11.00 8.75 0.020 6.00 8.758 8.62 13.50 11.00 0.020 8.00 11.0010 10.75 16.00 13.38 0.020 10.00 13.3812 12.75 19.00 16.13 0.020 12.00 16.
22、1214 14.00 21.00 17.75 0.015 notapplicable17.0016 16.00 23.50 20.25 0.015 see Note 5 19.0018 18.00 25.00 21.62 0.015 21.0020 20.00 27.50 23.88 0.015 23.0024 24.00 32.00 28.25 0.015 27.0030 30.00 38.75 34.75 0.015 33.0036 36.00 46.00 41.25 0.015 39.0042 42.00 53.00 48.00 0.015 45.0048 48.00 59.50 54.
23、50 0.015 51.0054 54.00 66.25 61.75 0.015 57.0060 60.00 73.00 68.12 0.015 63.0072 72.00 86.50 81.38 0.015 75.0084 84.00 99.75 94.25 0.015 87.0096 96.00 113.25 107.25 0.015 99.00AExtracted from American National Standard Neometallic Gaskets for PipeSizes (ANSI B16.21-1992), with the permission of the
24、publisher. The AmericanSociety of Mechanical Engineers, United Engineering Center, Three Park Avenue,New York, NY 10016.FIG. 1 Split Design (Flat Ring)FIG. 2 Split Design (Full Face)F3360226.3.2.1 Flat solid metal center.6.3.2.2 Corrugated metal center.6.3.2.3 Perforated metal center.6.3.2.4 Braided
25、 metal center.6.3.2.5 As specified.6.4 Construction 2, multiple layer inserts may be pre-assembled by gluing, taping, or any other suitable methodbefore inserting in the envelope.6.5 Elastomeric materials with high flow or creep propertieshave a tendency to stretch and split the envelope and are not
26、recommended unless special provisions are made in the design.6.6 Insert materials are not required to be corrosion-resistantin most cases since they are separated from the corrosives bythe corrosion-resistant envelope.6.7 Extremely hard materials (such as solid metal or phe-nolic laminates) are not
27、recommended for single layer con-struction inserts or the outer inserts in multiple layer construc-tions since excessive bolt torquing would be required to effecta satisfactory seal.6.8 For determining the suitability of inserts to seal satis-factorily, Test Method F 112 is recommended.FIG. 3 Machin
28、ed Design (Flat Ring)FIG. 4 Machined Design (Full Face)FIG. 5 Folded Design (Flat Ring)FIG. 6 Folded Design (Full Face)F3360237. Inspection7.1 Inspect electrically the corrosion-resistant materialsused as shields for enveloped gaskets after all machining andforming has been completed, using the meth
29、ods described inSpecifications D 3308 for tape and D 3294 for machinedarticles, Type 1, Grade 1.7.2 Commercial dimensional tolerances apply unless other-wise agreed upon between the seller and the purchaser.8. Keywords8.1 gaskets; corrosive service; gaskets; enveloped; gaskets;nonmetallic; polytetra
30、fluoroethylene (PTFE)ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringemen
31、t of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or f
32、or additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views know
33、n to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F336024
