Explosion Vented Equipment System Protection Guide

194 Pages·2021·8.393 MB·English

by  Robert C. Comer

Explosion Vented Equipment System
Protection Guide
Robert C. Comer, P.E.
Thiseditionfirstpublished2021
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LibraryofCongressCataloging-in-PublicationData
Names:Comer,RobertCharles,1934–author.
Title:Explosionventedequipmentsystemprotectionguide/RobertCharles
Comer.
Description:Firstedition.|Hoboken,NJ,USA:JohnWiley&Sons,2020.|
Includesindex.
Identifiers:LCCN2020022867(print)|LCCN2020022868(ebook)|ISBN
9781119640035|ISBN9781119640066(adobepdf)|ISBN9781119640073
(epub)
Subjects:LCSH:Dustcontrol–Equipmentandsupplies.|Fire
prevention–Equipmentandsupplies.
Classification:LCCTD884.5.C6552020(print)|LCCTD884.5(ebook)|
DDC628.9/22–dc23
LCrecordavailableathttps://lccn.loc.gov/2020022867
LCebookrecordavailableathttps://lccn.loc.gov/2020022868
Coverdesign:Wiley
CoverImages:(background)©JoseA.BernatBacete/GettyImages
(graph)CourtesyofRobertComer
Setin9.5/12.5ptSTIXTwoTextbySPiGlobal,Pondicherry,India
PrintedintheUnitedStateofAmerica
10 9 8 7 6 5 4 3 2 1
Thisbookisdedicatedtomybeautiful,extraordinarywifeJeanandthe
beautiful,talentedfamilythatwehavebeenblessedwith.DaughterLynn,her
husbandJack,theirsonAdam,hiswifeJessica,theirsonAndrew,hiswife
Sarah;daughterDonna,herhusbandGeorge,theirsonJonathan,their
daughterJacqueline;anddaughterKerryAnn,herhusbandJohn,their
daughterSamantha,theirsonsChristopherandStephen.
v
Contents
Preface ix
Introduction xi
HowtoUseThisBook xiv
Symbols xv
TypicalDustCollectionSystemChecklist xix
Acknowledgments xxi
Part1 StructuralAnalysisandDesignforReinforcing
DustHandlingSystems 1
Part1:Introduction 3
1 DesignCriteriaandGeneralTheory 5
2 Square/RectangularDustCollectorWall,Roof,andHopperSections 9
RectangularPanelStresses 10
ReinforcingMembersAnalysisforExample2.1 13
DustCollectorSideandRearPanels 23
HopperPanels:ReinforcingHorizontalandVerticalMembers 23
HopperPanels:UsingHorizontalMembersOnly 25
RibbedDustCollectors 32
3 Round/CylindricalDustCollectors 35
Ports:(Nozzles) 40
VesselHeadNotFlat 45
4 ReinforcingMembertoPanelWeldAnalysesandPort(Nozzle)Weld
Analyses 47
CornerMiterJointReinforcingWeldAnalysis 54
Port(Nozzle)ReinforcingWeldAnalyses 56
vi Contents
5 AccessDoors,Hinges,andLatches 59
AccessDoor 59
ReinforcingMembertoAccessDoorWeldAnalysis 60
HingesandLatches 62
BoltedConfiguration 62
Welds 66
ToggleClampConfiguration 67
6 ExplosionVentDucts,MillInletAirDucts,BlastDeflectors,andFilterBag
CageDesign 69
VentDuctFlangeBoltLoadingandStress 73
FlangeGasketSealingDesignRequirements 73
HammermillAirInletDuct 102
BirdScreens 105
7 ExplosionVentDuctWeatherCovers 107
8 DustCollectorStability 115
WindForce(F ) 117
w
FloororGroundAnchor 118
9 SystemExplosionIsolation 121
PressureProfile 122
10 ScrewConveyors,RotaryAirlockValves,andIsolationValves 123
RotaryAirlockValves 123
IsolationValves 125
General 125
11 GroundingofSystems 127
12 HousekeepingandGeneralInformation 133
GeneralInformation 133
AppendixA Part1:Worksheet 135
StructuralTubing–PanelWorksheet(Example) 135
CompositeSectionofTubewithPanel 135
StructuralTubing–PanelWorksheet 136
CompositeSectionofTubewithPanel 136
StructuralAngle–PanelWorksheet(Example) 137
Contents vii
CompositeSectionofAnglewithPanel 137
StructuralAngle–PanelWorksheet 139
CompositeSectionofAnglewithPanel 139
StructuralChannel–PanelWorksheet 140
CompositeSectionofChannelwithPanel 140
ReinforcingRib–PanelWorksheet 141
CompositeSectionofRibwithPanel 141
Detail1:PaneltoPanelCornerJointWorksheet 142
Detail2:PaneltoPanelCornerJointReinforcedWorksheet 142
Detail3:ReinforcingMemberMiterJointWeldWorksheet 143
Detail4:Square/RectangularBoltedFlangeWorksheet 144
Detail5:RoundDuctBoltedFlangeWorksheet 145
Part2 ExplosionReliefElementandExplosionFlowing
PressureAnalyses 147
Part2:Introduction 149
13 KnowYourProcessDustCharacteristics 151
14 VentingAnalysisofDustHandlingSystems 155
Square/RectangularDustCollector 155
ExamplewithFigure14.1:ExistingVesselwithExplosionVentCloseto
Hopper 157
Symbols:RefertoNFPA68(2013) 158
ExamplewithFigure14.2:VesselwithExplosionVentHighon
Vessel 160
CylindricalDustCollector 162
ExamplewithFigure14.4:CylindricalVesselwithExplosion
VentontheSide 162
Symbols:RefertoNFPA68(2013) 164
ExamplewithFigure14.5:CylindricalVesselwithExplosion
VentontheTop 165
Symbols:RefertoNFPA68(2013) 166
15 DuctBackPressureConsiderations 169
DuctBackPressureCorrection 172
SummaryoftheExamples 174
Square/RectangularDustCollectors 174
CylindricalDustCollectors 175
viii Contents
16 OtherMethodsofExplosionPressureReduction 177
ChemicalSuppressionSystem 177
TenbarRatedMills 177
FlamelessVentingSystem 178
AppendixB Part2:Worksheet 179
DustCollectionSystemChecklist 179
References 181
Index 183
ix
Preface
Thisbookpresentspracticalapplicationsandguidanceforengineers.Itprovidesa
referencetomeettheneedsofacompanylicensedorcompetentunlicensedengi-
neer,thatbyeducationorexperienceunderstandstheconceptspresentedinthis
book.Itprovidesguidancetoanalyzeanddesignorretrofitdustcollectionequip-
menttoresistdustexplosions,toprotectemployeesandreduceproductiondown
time.Theintentofthebookisnottoencouragelicensedorcompetentunlicensed
engineerstopracticeoutsideoftheirfieldofexpertise,buttoprovideguidanceto
competentengineerstoenhancetheirknowledgeandapproachtothenarrowarea
ofdusthandlingexplosionventingandsystemreinforcing.Dustcollectorsystems
are not very complicated in scope and design. The reinforcing of thin panels is
commontoallsquare/rectangulardustcollectorsasarecylindricaldustcollector
roofsandaccessdoors.Boltedflangeconnections,hinges,andlatchesarecommon
and easily analyzed. This book providesguidance for these conditions. Licensed
engineersandengineeringconsultingfirmsmayfindthisbooktobeanadvantage
in obtaining the business of mitigating hazards for the many facilities that will
have their hazards exposed by the National Fire Protection Association (NFPA)
mandate of providing a dust hazard analysis of all facilities by September 2020.
Manyfacilitiesdonothaveanengineeronstaff,andtheywillbeobligatedtohire
anoutsideconsultanttomitigatetheirhazards.
Detailed explanations of formulas and tedious derivations are not necessary
andareavoided.Thedataarepresentedintablesandgraphsalongwithexamples
toillustratetheactualapplications.
For each topic, the general principles and theories are stated, followed by
extensive tables and worksheets for use in calculations of stress and strain and
to design reinforcing of equipment with adequate and economical reinforcing
members.
x Preface
The examples are based on actual proven designs developed by the author by
analyzing over 200 systems to clearly illustrate application of the information
provided.
The book is arranged to provide a means of solving practical engineering
problems.
Althougheveryefforthasbeenmadetoavoiderrors,itispossiblesomecould
exist.Iwillbegratefulforanyneededcorrections.
RobertC.Comer
Rockaway,NJ
09June2020