[www.staffempire.com]-ASME B16.42-1998 球墨铸铁管法兰和法兰管件 150和300磅级.pdf

The American Society of Mechanical Engineers OUeTllE IRON PIPE FLANGES AND FlANllED FITTINGS Classes 150 and 300(Revision 01 A S M U A N S I B1 6.42-1 987)Date of Issuance:April 26,1999 The 1998 edition of this Standard is being issued with an automatic addenda subscription service.The use of addenda allows revisions made in response to public review comments or committee actions to be published on a regular yearly basis;revisions published in addenda will become effective six months after the Date of Issuance of the addenda.The next edition of this Standard is scheduled for publication in 2003.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.The interpretations will be included with the above addenda service.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment,which provides an opportunityfor additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or ”endorse“any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assumes any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or persods)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibilityfor onlythose interpretations issued in accordance with governing ASME procedures and policies which precludes the issuance of interpretations by individual volunteers.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical Engineers Three Park Avenue,New York,NY 10016-5990 Copyright O 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.FOREWORD(This Foreword is not part of ASME 816.42-1998.1 In 1921,the American Engineering Standards Committee,later the American Standards Association(ASA),now the American National Standards Institute(ANSI),authorized the organization of a Sectional Committee on the Standardization of Pipe Flanges and Flanged Fittings,with the following organizations as joint sponsors:Heating,Piping,and Air Conditioning Contractors National Association(later the Mechanical Contractors Association of America,MCAA),Manufacturers Standardization Society of the Valves and Fittings Industry(MSS),and The American Society of Mechanical Engineers(ASME).Cast iron flanges and flanged fittings are within the scope of Subcommittee No.1(now Subcommittee A),with standards approved by ASA as early as 1928.In 1957,piping components of ductile,iron(also called nodular iron and,in Europe,spheroidal graphite iron)first appeared in the market.Controversy immediately developed over proper pressure-temperature ratings,and this was further aggravated by the use of casting patterns for both gray iron and carbon steel for producing the components.Conflicting philosophies,which emerged from that controversy,thwarted efforts by MSS to develop standard practices in the early 1960s;the conflicts persisted during a study of ratings,starting in 1966 by American National Standards Committee BI6(as the Sectional Committee was called after reorganization of ASA as ANSI).The conflict continued to delay acceptance and approval of this Standard,which ultimately originated with a draft developed by MSS(taking.advantage of earlier efforts)and submitted to Subcommittee A in 1977.Combining that draft with the rating basis developed in the B16 Committee,the first edition of this Standard was found acceptable and was approved by the Standards Committee,cosecretariat organizations,and ANSI,and was published with the designation In 1982,American National Standards Committee B16 was reorganized as an ASME Committee operating under procedures accredited by ANSI.The 1981 edition of the Standard updated the referenced standards and specifications and established U.S.customary units as the standard.Following approval by the Standards Committee and ASME,ANSI granted its approval as an American National Standard on July 13,1987,with the new designation In the 1998 edition of ASME B16.42,Reference Standards are updated,a Quality System Program Annex is added,and several editorial revisions are made.Following approval by ASME B16 Subcommittee B and B16 Main Committee,ANSI approved this American National Standard on November 20,1998.Requests for interpretation or suggestions for revision should be sent to the Secretary,BI6 Committee,The American Society of Mechanical Engineers,Three Park Avenue,New York,NY 10016-5990.ANSI B 16.42-1979.ASMWANSI B16.42-1987.111 STD-ASME BLb-42-ENGL L778 0757670 Ob08778 33T m ASME B16 COMMllTEE Standardization of Valves,Flanges,Fittings,Gaskets,and Valve Actuators(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERS 1 W.N.McLean,Chair H.R.Sonderegger,Vice Chair P.A.Reddington,Secretary COMMITTEE PERSONNEL W.L.Ballis,Consultant,London,Ohio R.W.Barnes,Anric Enterprises,Etobicoke,Ontario,Canada R.R.Brodin,Fisher Controls International,Inc.Marshalltown,Iowa M.A.Clark,Nibco,Inc.,Elkhart,Indiana A.Cohen,A.Cohen and Associates,Albuquerque,New Mexico C.E.Floren,Mueller Co.,Decatur,Illinois D.R.Frikken,Solutia,Inc.,St.Louis,Missouri R.Henrich,Minnegasco,Inc.,Golden Valley,Minnesota J.C.Inch,Mueller Refrigeration Products Co.,Hartsville,Tennessee G.A.Jolly,Vogt Valve Co.,Louisville,Kentucky W.G.Knecht,BW/IP International,Inc.,Williamsport,Pennsylvania R.Koester,The William Powell Co.,Cincinnati,Ohio W.N.McLean,Newco Valves,Palos Park,Illinois M.L.Nayyar,Bechtel Power Corp.,Gaithersburg,Maryland P.A.Reddington,The American Society of Mechanical Engineers,New York,New York R.A.Schmidt,Trinity-Ladish Co.,Russellville,Arkansas H.R.Sonderegger,Grinnell Corp.,Cranston,Rhode Island W.M.Stephan,Flexitallic,Inc.,Mount Laurel,New Jersey T.F.Stroud,Ductile Iron Pipe Research Association,Birmingham,Alabama M.D.Wasicek,ABS Americas,Houston,Texas R.E.White,Richard E.White and Associates,South Bend,Indiana D.A.Williams,Southern Company Services,Birmingham,Alabama L.A.Willis,The Dow Chemical Co.,Freeport,Texas W.R.Worley,Union Carbide Corp.,South Charleston,West Virginia PERSONNEL OF SUBCOMMITTEE B-THREADED FITTINGS(Except Steel)H.R.Sonderegger,C&S Chair,Grinnell Corp.,Cranston,Rhode Island B.P.Feder,Secretary,The American Society of Mechanical Engineers,New York,New York K.Barron,Ward Manufacturing,Blossburg,Pennsylvania M.A.Clark,Nibco,Inc.,Elkhart,Indiana A.Cohen,A.Cohen and Associates,Albuquerque,New Mexico A.A.Knapp,Canadian Copper/Brass,Ontario,Canada R.L.Larkin,American Darling Valve,Birmingham,Alabama P.1.McGrath,Consultant,Birmingham,Alabama W.N.McLean,Newco Valves,Palos Park,Illinois J.K.Schultz,Conine Manufacturing Co.,Tyler,Texas V CORRESPONDENCE WITH B16 COMMITTEE General.ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests.As such,users of this Standard may interact with the Committee by requesting interpretations,proposing revisions,and attending Committee meetings.Correspondence should be addressed to:Secretary,B16 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York,NY 10016-5990 Proposing Revisions.Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable,as demonstrated by the experience gained from the application of the Standard.Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard.Such proposals should be as specific as possible,citing the paragraph number(s),the proposed wording,and a detailed description of the reasons for the proposal,including any pertinent documentation.Interpretations.Upon request,the B16 Committee will render an interpretation of any requirement of the Standard.Interpretations can only be rendered in response to a written request sent to the Secretary of the B16 Main Committee.The request for interpretation should be clear and unambiguous.It is further recommended that the inquirer submit hisher request in the following format:Subject:Cite the applicable paragraph number(s)and the topic of the inquiry.Edition:Cite the applicable edition of the Standard for which the interpretation is being requested.Question:Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use,not as a request for an approval of a proprietary design or situation.The inquirer may also include any plans or drawings,which are necessary to explain the question;however,they should not contain proprietary names or information.Requests that are not in this format will be rewritten in this format by the Committee prior to being answered,which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available.Further,persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee.ASME does not“approve,”“certify,”“rate,”or“endorse”any item,construction,proprietary device,or activity.Artending Committee Meetings.The B16 Main Committee regularly holds meetings,which are open to the public.Persons wishing to attend any meeting should contact the Secretary of the B16 Main Committee.vii CONTENTS Foreword.Standards Committee Roster.Correspondence With the B 16 Committee.1 Scope.1.1 General.1.2 Quality Systems.1.3 References.2 Pressure-Temperature Ratings.2.2 Ratings of Flanged Joints.2.4 Temperature Considerations.2.1 General.2.3 Rating Temperature.2.5 Variances From Ratings.3 Size.3.1 Nominal Size.3.2 Reducing Fitting Sizes.3.3 Reducing Flange Sizes.4 Marking.5 Materials.5.1 Castings.5.2 Bolting.5.3 Gaskets.6 Dimensions.6.1 Center-to-Contact Surface and Center-to-End.6.2 Facings.6.3 Flange Bolt Holes.6.4 Spot Facing.6.5 Reducing Flanges.6.6 Threads for Threaded Flanges.6.7 Stud Bolts.Bolts,and Nuts.6.8 Gaskets.6.9 Drains.7 Tolerances.7.1 Wall Thickness.7.2 Center-to-Contact Surface and Contact Surface-to-Contact Surface.111 V vii 1 1 1 1 2 2 2 3 3 3 4 4 4 4 4 5 5 5 5 5 ix STD*ASME BLh-!Z-ENGL L778 m 0757b70 Ob070UL 522 D 7.3 Facings.5 7.4 Flange Thickness.5 7.6 Drilling and Facing.5 7.5 Bore of Flanges.5 8 Testing.5 8.1 General.5 8.2 Flange Testing.5 8.3 Fitting Shell Tests.5 Figures 2 Method of Designating Location of Tapped Holes for Drains 1 Method of Designating Outlets of Reducing Fittings.7 When Specified.8 1 Pressure-Temperature Ratings.U.S.Customary Units.2 2 Reducing Threaded Flanges for Class 150 and 300.9 3 Templates for Drilling Class 150 Ductile Iron Flanges.IO 4 Dimensions of Class 150 Ductile Iron Flanges.l i 5 Dimensions of Class 150 Elbows.Double Branch Elbows,Tees.Crosses.Laterals.True Ys(Straight Sizes).and Reducers.13 6 Dimensions of Class 150 Base Elbows and Base Tees.14 7 Templates for Drilling Class 300 Ductile Iron Flanges.15 8 Dimensions of Class 300 Ductile Iron Flanges.17 9 Dimensions of Class 300 Elbows.Tees.Crosses.Laterals.True Ys(Straight Sizes).and Reducers.19 10 Dimensions of Class 300 Base Elbows and Base Tees.20 Annexes A Methods for Establishing Pressure-Temperature Ratings.21 B References.23 C Quality System Program.25 Tables X ASME B16.42-1998 DUCTILE IRON PIPE FLANGES AND FLANGED FITTINGS Classes 150 and 300 1 SCOPE 2 PRESSURE-TEMPERATURE RATINGS 1.1 General 2.1 General This Standard covers minimum requirements for Class 150 and 300 cast ductile iron pipe flanges and flanged fittings.The requirements covered are as follows:(a)pressure-temperature ratings(b)sizes and method of designating openings(c)marking(d)materials(e)dimensions and tolerances(f)bolts,nuts,and gaskets(8)tests 1.2 Quality Systems Requirements relating to the product manufacturers Quality System Programs are described in Annex B.1.3 References 1.3.1 Referenced Standards.Standards and spec-ifications adopted by reference in this Standard are shown in Annex C,which is part of this Standard.It is not considered practical to identify the specific edition of each standard and specification in the individual references.Instead,the specific edition reference is identified in Annex C.1.3.2 Codes and Regulations.A flange or flanged fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code,the ASME Code for Pressure Piping,or a governmental regulation is subject to any limitation of that code or regulation.This includes any maximum temperature limitation,any rule governing the use of a material at low temperature,or provisions for operation at a pressure exceeding the pressure-temperature ratings in this Standard.Cast ductile iron pipe flanges and flanged fittings covered by this Standard shall be designated as one of the following:Class 150 or 300.Except as provided in para.2.5,ratings are,maximum allowable nonshock working pressures,expressed as gage pressure,at the service temperature from-20F to 650F.Ratings in Table 1 are in U.S.customary units.For intermediate temperatures,linear interpolation is permitted.Methods for establishing pressure-tempera-ture ratings are given in Annex A.2.2 Ratings of Flanged Joints Ratings in this Standard apply to flanged joints that conform to the limitations on bolting in para.5.2 and on gaskets in para.6.8,and which are made up in accordance with good practice for alignment and assem-bly.See also para.2.4.Use of the ratings for flanged joints not conforming to these limitations is the sole responsibility of the user.Requirements for alignment and assembly of joints are not given in this Standard.If the two flanges in a flanged joint do not have the same pressure-temperature ratings,the rating of the joint at any temperature is the lower of the two flange ratings at that temperature.2.3 Rating Temperature The temperature shown for a corresponding pressure rating is the temperature of the pressure-containing shell of the flange or flanged fitting.In general,this temperature is the same as that of the contained fluid.Use of a pressure