pec_12C-1958_scan.pdf

nniiUIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIUIIIIIIIIIIIIIIIIIIIIIIIIIIInllnllnl1111111,n1111111,111111111111111111111111111111rnnnnull1nnunnnllllllllllllllll API SPECIFICATION FOR API STD 12C Fifteenth Editipn March 1958 WELDED OIL STORAGE TANKS This publication is distributacl as is and is no longer a current publication of the American Petroleum Institute.It is fumishacl solely for historic purposes and some or all of the information may be outdatacl.API MAKES NO WARRANTY OF ANY KIND,EXPRESS OR IMPUED,AND SPECIFICALLY THERE IS NO WARRANTY OF MERCHANTABIUTY OR FITNESS FOR A PARTICULAR ISSUE.AMERICAN PETROLEUM INSTITUTE NewYork,N.Y.Issued by AMERICAN PETROLEUM JNStlTOTE Division of Production Dallas 1,Texas 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 Copyright 1958 by American Petroleum Institute 2 American Petroleum Institute TABLE OF CONTENTS Page Suggestions for Ordering-.3 Foreword-4 1:Scope-5 2:Material-5 S:Design-6 3.1 Joint Design-6 3.2 Bottom Design-8 3.3 Shell Design-9 3.4 Design of Wind Girders for Open-Top Tanks-13 3.5 Roof Design-14 3.6 Tank Appurtenances-15 4:Fabrication-42 4.1 General-42 4.2 Shop Inspection-42 5:Erection-43 5.1 General-43 5.2 Details of Welding_ _ _ 48 5.3 Testing,Inspection,and Repairs.-44 6:Testing Shell J oints-46 6.1 Sectioning Method-.46 6.2 Radiographic Method-48 7:Welding Procedure and Welder Qualifications _ 54 7.1 General-54 7.2 Welding Procedure Quali:fication.-54 7.3 Welder Qualification-60 7.4 Welding Procedure Speci:fication.-63 8:Marking-64 Appendix A:Reference and Typical Design Data.-65 Appendix B:Recommended Practice for Construction of Foundations.-.71 Appendix C:Floating Roofs-75 Appendix D:Composite Tanks-76 Appendix E:Use of API Monogram.-77 Note This specillcation was originally adopted as tentative in 1935,and as standard in 1940.Revised editions were issued in 1942,1944,1946,1948,1960,1961,1962,1964,1966,and 1967.The present edition supersedes the 14th edition,dated October 1967.It includes changes adopted at the 1967 meeting,as detailed in Circ.PS-1117.This publictztim&IMliJ be fIIPfOdtt.CBd in whols or in part,efll:oept that the of!i.ciDJ publicatitni m0110gram a.ppeanng on the outside ccwer ma.71 not be feproduced.All f8pfOducti0118 shall CMf1J the sta.temellt,Repn-duced by pennission fom API Std 11C:Specijica.titm.of Welded Oil Storage Ta.f&ka.This pefmisBIOII does not include the right to f8ploduce this specifica.tiOII a.s a.separate publication for fBBa.le or a.s a.tnlftBla.tion.Suck ngkts MS granted.Olll71 on special a.v.th.oriza.titm.Welded Oil Storage Tanks 3 SUGGESTIONS FOR ORDERING The purchaser should state on his inquiry or pur-chase order the following:Specification.API Std 12C Number of tanks.Diameter,ft.Height,ft.Nominal capacity,bbl.Time of completion.Freight and hauling.Erection,location and facilities.-.Par.5.1.2 Tank grade details.Par.5.1.1,Appendix B Plate specifications(bottom,shell,and roof).Bolting.Par.2.9 Bottom design:Thiclmess of plates.Par.3.2.1 Size of plates.Par.3.2.1 Joint design.Par.3.2.3 Shell design:Max.Sp.Gr.of contents.Par.3.3.2 Thickness of plates(each course).Par.3.3.4 Width of plates.Par.3.3.7 Wind girders.Sect.3.4 Roof and roof support design.Sect.3.5,Appendix C Tank appurtenances(type,size,and location)-Sect.3.6 Stairways,platforms,and walkways.Tables 17,18,19 Shop Inspection-Sect.4.2 Field inspection-Sect.5.3 Bottom test.Par.5.3.4 Shell Test.Par.5.3.6 Roof test.Par.5.3.7 Painting requirements.Par.5.1.4 Special provisions(permits,fees,liability,etc.)The purchaser may exercise an option with respect to the following requirements.Mill test.reports.-.;Par.4.2.1 Bottom plate arrangement and welding procedure.Par.5.2.9,10 Shell plate aligmnent.Par.3.3.8 Top angle orientation.Par.3.3.10 Horizontal joint penetration and fusion.Par.3.3.12 Roof column.Par.3.5.6 Roof slope.Par.3.5.7 Shell manhole design.-.Fig.7 Shell nozzle design.Fig.8,&Cleanout fitting support.Par.3.6.9,Fig.ll Roof nozzle flange design.Fig.13,14 Drawotf elbow design._.Fig.15,16 Welding procedure qualification test reports.-.-.-Par.7.1.5 Welder or welding operator qualification test reports.Par.7.1.5,7.3.23 Welding procedure specifi.cation.-.Sect.7.4 The following requirements are subject to agree-ment between the purchaser and the manufacturer.Shell joint tests.Part 6 Shell plate width.,.Par.3.3.7 Sectioning method.Sect.6.1 Closure of openings.Par.6.1.19 Segment ownership.Par.6.1.27 Radiographic method.Sect.6.2 Film ownership.Par.6.2.17 This publlcallon is distributed as is and Is no longer a currant publication of the American Petroleum Institute.It is fumished solely for historic purposes and some or all of the Information may be outdated.API MAKES NO WARRANTY OF ANY KIND,EXPRESS OR IMPUED,AND SPECIFICALLY THERE IS NO WARRANTY OF ME