_API_PUBL_937-1996.pdf

API PUBL*9379607322900559027422SPECIAL NOTES(1)API publications necessarily address problems of a general nature.With respect to particular circumstances,local,state,and federal laws and regulations should be reviewed.(2)API is not undertaking to meet the duties of employers,manufacturers,or suppliers to warn and properly train andequip their employees,and others exposed,concerning health and safety risks and precautions,nor undertaking theirobligations under local,state,or federal laws.(3)Information concerning safety and health risks and proper precautions with respect to particular materials andconditions should be obtained from the employer,the manufacturer or supplier of that material,or the material safety datasheet.(4)Nothing contained in any API publication is to be construed as granting any right,by implication or otherwise,for themanufacture,sale,or use of any method,apparatus,or product covered by letters patent.Neither should anything containedin the publication be construed as insuring anyone against liability for infringement of letters patent.(5)Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every five years.Sometimes aone-time extension of up to two years will be added to this review cycle.This publication will no longer be in effect five yearsafter its publication date as an operative API standard or,where an extension has been granted,upon republication.Status ofthe publication can be ascertained from the API Authoring Department telephone(202)682-8000.A catalog of APIpublications and materials is published annually and updated quarterly by API,1220 L Street,N.W.,Washington,D.C.20005.Copyright o 1996 Welding Research Council Inc.American Petroleum InstituteNot for ResaleAPI PUBL*93796073229005590283b9EVALUATION OF DESIGN CRITERIAFOR STORAGE TANKSWITH FRANGIBLE ROOF JOINTSDaniel Swenson,Co-InvestigatorDon Fenton,Co-InvestigatorZhi Lu,Graduate Research AssistantAsif Ghori,Graduate Research AssistantJoe Baalman,Graduate Research AssistantMechanical Engineering DepartmentKansas State UniversityManhattan,KS 66506API PUBLICATION 937-APRIL 1996American Petroleum Institute1220 L Street,NorthwestWashington,D.C.20005Not for ResaleAPI PUBL*9379b07322900559030T17CONTENTS1.0 ntroduction12.0 Background Information.22.1 Description of Typical Tank Design.22.2 API650 Design Rules for Frangible Roofs.22.8 Derivation of API650Rules.52.4 Derivation of We and Wh in API 650 Design Rules.72.4.1 Derivation of Wc.2.4.2 Derivation of Wh.82.5 Summary of Frangible Joint Study by British Researchers.108.0 Combustion Analysis.118.1 Combustion Wave Geometry.113.2 Combustion Calculation.143.2.1 Flame Temperature Calculation.143.2.2 Burning Velocity.153.2.8 Calculation of Pressure Rise.163.3 Venting183.4 Pressure Sensitivity Study.183.4.1 Effect of Ignition Source Location.183.4.2 Effect of Tank Size on Pressure Rise.203.4.3 Effect of Different Fuels and Air-to-Fuel Ratios.204.0 Structural Analysis.214.1 Scoping Analyses of Full Scale Tanks.214.1.1 Static Stresses at the Roof-to-Shell Joint.214.1.2 Axisymmetric Modal Analysis.284.1.8 Elastic Buckling Analysis.284.2 Analyses of Model Tanks Tested Dynamically.294.2.1 Axisymmetric Large Displacement Static Analysis.304.2.2 Axisymmetric Large Displacement Dynamic Analysis.304.2.8 3-D Large Displacement Analysis.304.2.4 Analysis of Stitch Welded Tank.304.3 Analyses of Small Model Tanks.345.0 Testing.855.1 Joint Details.855.2 Static Test of Small Scale Model Tanks.375.3 Dynamic Test of Model Tanks.385.3.10 bjectives.385.8.2 Design of Model Tanks.385.8.8 Test Description.395.8.4 Results of Testing.486.0 API-Tank:A Program for the Design/Analysis of Tanks with FrangibleRoofdoints.556.1 Automatic Design.556.2 Structural Analysis.556.8 Nonlinear Solution Procedure.55进opitAme PetroeumSepeaOnrnetaCngpedwthoten3etomHsNot for Resale