1、Designation:F70481(Reapproved 2018)1An American National StandardStandard Practice forSelecting Bolting Lengths for Piping System FlangedJoints1This standard is issued under the fixed designation F704;the number immediately following the designation indicates the year of originaladoption or,in the c
2、ase 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1NOTEEditorial correcti
3、ons were made to Section 2 in September 2018.1.Scope1.1 This practice covers bolt and stud bolt lengths,quantities,and thread series for pipe to pipe and pipe to valveflanged joints(Note 1)in the nominal pipe size ranges of12through 48-in.(12.7 through 1219-mm)diameter and pressurerange of 125 throu
4、gh 2500 psi(0.8 through 17 236 kPa).NOTE1This is applicable when flange of valve has the same thicknessas mating flange.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 on
5、lyand are not considered standard.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,health,and environmental practices and deter-mine the applicability of regula
6、tory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Orga
7、nization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASME Standards:2B1.1 Unified Inch Screw Threads(UN and UNR ThreadForm)B16.1 Gray Iron Pipe Flanges and Flanged Fittings:Classes25,125,and 250B16.5 Pipe Flanges and Flanged Fittings:NPS 1/2 throughNPS 24 Metric/Inch StandardB
8、16.24 Cast Copper Alloy Pipe Flanges,Flanged Fittings,and Valves:Classes 150,300,600,900,1500,and 2500B18.2.1 Square,Hex,Heavy Hex,and Askew Head Boltsand Hex,Heavy Hex,Hex Flange,Lobed Head,and LagScrews(Inch Series)B18.2.2 Nuts for General Applications:Machine ScrewNuts,Hex,Square,Hex Flange,and C
9、oupling Nuts(InchSeries)2.2 MSS Standards:3MSS-SP-44 Steel Pipe Flanges3.Bolting Criteria3.1 Bolt and stud bolt lengths are computed using thefollowing(see Annex A1):3.1.1 Includes maximum nut thickness in accordance withASME B18.2.2.3.1.2 Does not include washer thickness.3.1.3 Does not include bol
10、t or stud bolt point height.3.1.4 Includes allowance for up to18-in.(3.2-mm)thickgaskets,except butterfly valves.3.1.5 Includes14-in.(6.3-mm)raised face in addition toflange thickness listed in tables for flanges rated at 400 psi(2.8kPa)and above.3.1.6 Includes use of heavy hex nut and bolt design.3
11、.1.7 Includes plus tolerance for flange thickness in accor-dance with ASME B16.5.3.2 All bolts and stud bolts have threads in accordance withASME B1.1,Class 2A dimensioning and nuts Class 2B.3.3 The material requirements for bolts,stud bolts,and nutsare obtained from the material specifications of i
12、ndividualsystem diagrams.3.4 Alloy steel bolting 1-in.(25.4-mm)nominal diameterand smaller and all carbon steel bolting has threads of the UNC1This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.11 onMachine
13、ry and Piping Systems.Current edition approved Sept.1,2018.Published October 2018.Originallyapproved in 1981.Last previous edition approved in 2014 as F704 81(2014).DOI:10.1520/F0704-81R18E01.2Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,
14、New York,NY 10016-5990,http:/www.asme.org.3Available from Manufacturers Standardization Society of the Valve and FittingsIndustry(MSS),127 Park St.,NE,Vienna,VA22180-4602,http:/www.mss-hq.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States
15、This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(
16、TBT)Committee.1 Series;alloy steel bolting above 1-in.nominal diameter hasthreads of the 8-UN Series.3.5 For detailed descriptions of flange bolting assemblies,butterfly valve bolting assemblies,and tapped lug-type butter-fly valve bolting assemblies,refer to Figs.17.4.List of Tables4.1 The tables are arranged in the following sequence:150-lb Steel Flanged JointsTable 1300-lb Steel Flanged JointsTable 2400-lb Steel Flanged JointsTable 3600-lb Steel Flanged JointsTable 4900-lb Steel Flanged Joint
