1、Provided by:www.spic.ir Licensee:NISOC LibraryA M E R C A N S T A Ma Ilea ble-1 ron Screwed Fittings ASA lll6.19-1951.-:UDC 621.643.4:669.13(R 3j on6or6 Heating,Piping,and Air Conditioning Contractors National Association Manufacturers Standardization Society of the Valve and Fittings Industry The A
2、merican Society of Mechanical Engineers 300 Lb BT COPY AVAJLABLE Reproduced By GLOBAL J ENGINEERING DOCUMENTS With The Pennission Of ANSI Under Royalty Agreement Putfi6eJ tJ THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 29 West 39th Street,New York 18,N.Y.OffCtP.L APPi-J.JEC C02Y Provided by:www.spic
3、.ir Licensee:NISOC LibraryForeword THE development of this standard was initi:lted in 1930 by the Manufacturers Standardization Society of the Valve and Fittings Industry in cooperation with the Association of American Railroads.The first edition of the MSS standard was published in 1932 under the t
4、itle,300-Lb Malleable-Iron Screwed Fittings(SP-31).After further study in the latest practice the MSS Ferrous Screw Fittings Com-mittee completed a revised edition,dated 1950,which was in agreement with the Association of American Railroads Purchase Specification M-404.The American Standards Associa
5、tion authorized the organization of Sectional Committee 816 on the Standardization of Pipe Flanges and Flanged Fittings in 1921 with the following organizations as joint sponsors:Heating,Piping,and Air Conditioning Contractors National Association;Manufacturers Standardization Society of the Val,e a
6、nd Fittings Industry;and The American Society of Mechani-cal Engineers.The MSS presented its Standard Practice No.SP-31-1950 to Subcommittee No.2 on Screwed Fittings of ASA Sectional Committee 816.It was accepted and,in turn,Subcommittee No.2 distributed a draft dated June,1950,to the members of the
7、 sectional committee for approval by l.:tter ballot.Following approval of the sectional committee and sponsor bodies,the proposal was presented to the American Standards Association with recommendation for approval as an American Standard.This approval was granted on March 28,1951.Copyright,1951,by
8、The American Society of Mechanical Engineers Printed in U.S.A.Provided by:www.spic.ir Licensee:NISOC LibraryOfficers of Sectional Committee on Standardization of Pipe Flanges and Fittings Dr.E.LaCrosse,Chairman L.W.Benoit,Secretary Personnel of Subcommittee No.l on Screwed Fittings L.W.Kattelle,Chai
9、rman,Asst.Chief Engr.,Walworth Company,New York,N.Y.F.J.Allen,Product Engr.,York Corporation,York Pa.C.T.Baker,Cons.Engr.,1070 Spring St.,Atlanta,Ga.L.W.Benoit,Exec.Secy.,Manufacturers Standardization Society of the Valve&Fittings Industry,New York,N.Y.A.L.Brown,Asst.Mgr.&Chief Engr.,Associated Fact
10、ory Mutual Fire Ins.Co.,Boston,Mass.Bureau of Ships,Code 350(liaison),Department of the Navy,Washington,D.C.T.M.Dugan,1308 Freemont St.,McKeesport,Pa.S.G.Flagg,Pres.,Stanley G.Flagg&Co.,Inc.,Philadelphia,Pa.E.L.Jacobsen,Engr.,Esso Engrg Oept.,Standard Oil Development Co.,Elizabeth,N.J.W.P.Kliment,En
11、gr.of Standards,Crane Company,Chicago,Ill.F.B.Lasette,Frank B.Lasette,Inc.,Long Island City,N.Y.Rowland Tompkins,Pres.,Rowland Tompkins&Son,New York,N.Y.H.L.Underhlll,Shelter Island Heights,N.Y.T.E.Ve1tfort,Mgr.,Copper&Brass Research Association,New York,N.Y.F.L.Scovill,Jr.(alternate forT.E.Vdtfort)
12、,Asst.to Mgr.,Copper&Brass Research Associa-tion,New York,N.Y.J.H.Wllllams,Mech.Engr.,Grinnell Corporation,Providence,R.I.J.H.Zlnk,Pres.,Heat&Power Corporation,Baltimore,Md.Any part of this standard may be quoted.Credit Jines should read:Extracted from American Standard Malleable-Iron Screwed Fittin
13、gs,300 L!J(ASA Br6.u;-I95I),with the permission of the publisher,The American Society of Mechanical Engineers,29 West.39th Street,New York r8,N.Y.Provided by:www.spic.ir Licensee:NISOC LibraryAmerican Standard Malleable-Iron Screwed Fittings 300Lb Introductory Notes 1 Scope 1.1 This standard practic
14、e covers minimum requirements for 300-lb malleable-iron screwed fittings in sizes 1/4 to 3 in.,inclusive.2 Pressure Ratings 2.1 All fittings made to the requirements of this standard shall have maximum nonshock serv-ice ratings as follows:STEAM AND OIL 1/c to 3 in.,incl.300 lb at 550 F LIQ.UID AND G
15、AS AT 150 F 1/c to 1 in.,incl.2000 lb 11/4 to 2 in.,incl.1500 lb 21/t and 3 in.,1000 lb 2.2 Street elbows are not recommended for pressures above 600 lb.3 Size 3.1 The size of the fittings scheduled in the following tables is identified by the corresponding nominal pipe size.3.2 In the case of reduc
16、ing tees,the size of the larger run opening shall be given first,followed by the size of the opening at the opposite end of the run.The size of the branch opening is given l11.st.4-Marking 4.1 Each fitting shall be marked for identifica-tion with(a)makers name or sr,mbol;(b)the numerals 300;(c)the letters MI to designate malleable iron;(d)the size;(e)other markings as permitted by MSS Standard Practice Marking System for Valves,Fittings,Flanges,and Unions(SP-25)and AAR standards.S Material 5.1 T