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Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regim e of right to information for citizens to secure access to information under the contr ol of public authorities, in order to promote transparency and accountability in the working of ev ery public authority, and whereas the attached publication of the Bureau of Indian Standards i s of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made ava ilable to promote the timely dissemination of this information in an accurate manner to the pu blic.

Satyanarayan Gangaram Pitroda

"Invent a New India Using Knowledge"

Jawaharlal Nehru

"Step Out From the Old to the New"

Mazdoor Kisan Shakti Sangathan

"The Right to Information, The Right to Live" Bhart hari - N ti atakam "Knowledge is such a treasure which cannot be stolen" "Invent a New India Using Knowledge" construction of steel chimneys, Part 1: Mechanical aspects [CED 7: Structural Engineering and structural sections]

IS 6533 ( Part 1) : 1989

Reaffirmed 1995)

REAFFIRMED 20

10

IndianStandard

DESIGNANDCONSTRUCTIONOF STEEL

CHIMNEY

C

ODEOFPRACTICE

PART1MECHANICAL ASPECT

( FirstRevision)

FourthReprintSEPTEMBER2003

U

DC697.8 [669.14] : 006.76

B

IS1990

BURE

AU OF INDIAN STANDARDS

MANAK BRAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEWDELHI110002

September

19 90

Price Group 8

II,)\II

'1'0

IS6533(PART1) :1'8'DESIGNANDCONSTRUCTION

orSTEILCHIMNEY-CODEOFPRAC'I'ICE

PART1 MECHANICAL ASPECT

(FirstR."u;oll) (,.,.15,c..·11-1.1) -SubsritutethefollowingCortheexisting tom.II:-l '8• {CEO')

ReproaraplayUait,81S.NewDelhi,lndia

FOREWORD

IndianStandard(Part1 ) (FirstRevision)wasadoptedbytheBureauofIndianStandards on 20April1989,afterthedraftfinalizedbytheStructuralEngineeringSectionalCommittee had beenapprovedbytheStructuralandMetalsDivisionCouncil. Thisstandardwasfirstpublishedin 1971.Onsuggestionsbypractisingengineersand a,follows:

Part 1Mechanical

aspects,and

Part2Structuralaspects.

on the heightofchimneyandthisaspecthasbeentakenintoaccountinthisrevisioninaddition dataavailable. only.Inthisstandard(Part1 ) amoregeneralizedapproachforthedetermination"ofheightof chimneysinrelationtoconcentrationofpollutantshasbeenincludedkeepingin viewan In thepreparationofthisstandard,considerableassistancehasbeenderivedfromBS 4076 : 1978 'Specificationforsteelchimneys',

IndianStandard

DESIGNANDCONSTRUCTIONOFSTEEL

CHIMNEY-CODEOFPRACTICE

PARTtMECHANICALASPECT

(FirstRevision)

1SCOPE4TERMINOLOGY

4.2BlaakiagOffPlate

An imperforateplatefittedimmediatelybeneath the inlet of a chimney to prevent thewaste gasesreaching the lowerportion of thechimney. 4.3

BollerEfticieDcy

Theratioofheatused intheboiler to the

available heat.

4.4Boiler-MountedChilDDey

Achimneysupportedbya boiler andits

foundation.

4.5Drart Loss

Drop in static pressure of gas between twopoints in a system.

4.6EffluxVelocity

Thespeed ofdischargeofgasesfromthetopof thechimney.

4.7 Flux

GISTemperature

Temperature offluegasat the chimneyoutlet.

4.8

ForcedDr.ft

IS8:1983

2.1ThefollowingIndianStandards

necessaryadjuncts to thisstandard:

ISNo.Title

IS 6 :1983Specificationforthe mode

rate heatdutyfireclayrefractories, group 'A'(fourth revision)

Specification

forhighheat dutyfireclayrefractories,group 'B'(fourthrevision)

IS460Specificationfor test sieves:( Part 1

):985Part 1Wirecloth test sieves (thirdrevision)

IS 460Specificationfortestsieves:

( Part2):1985Part2 Perforated plate testsieves( thirdrevision) IS

2042:1972Specification for insulating

bricks(firstrevision) lS4041:1987Glossary of terms relating torefractory materials(first revision) IS8829:1978Guidelinesformicrometeorological techniques in air pollutionstudies

1.1 This standard(Part1)covers design,4.0For thepurposeof this standardtermlno

construction, maintenanceandinspectionof10BYas defined in4.1to4.21shall apply.For mechanical aspects ofsteelchimneys.Thedefinitionsnot covered in this part, areference mechanicalaspects includelining,draftcalcula-shall be made toPart2 of the standard. and ashdisposal.4.1 ActualDraft

2REFERENCESThesuction producedatthebase of achimney

minusthe dropindraftdueto frictionalresist- are anee inftuegaspassages. 3

STATUTORYPROVISIONS

Systemwhich maintains the products of

3.1Compliancewith this code does notrelievecombustion,whenflownto or throughit,at a

anyonefrom theresponsibilityof observingpressureaboveatmospheric. provisionsasmayhave beenpromulgatedby4.9GroundLeyelCODceDtratloD anystatutory bodiesand/orobservingprovincialbuilding by-lawsand the civil aviation require- Concentration of air pollutant inma/ ml in themeats pertainingto such structures.breathing zone. I a) Steelchimneysareideally suited for processworkwhereashortheat up periodand low thermal capacity are requiredwhereasitencouragesacidcondensation and corrosion hencesmut tingand reduction in the lifeofchimney; b) Guyed steelchimneysare better suited where thesupporting capability of thesoil is low whereas itinvolvesregular maintenanceofguywiresanchorpointsand other fittingsin addition todifficulty infindingsuitableanchor pointsofguys at ground; c)

Reinforced cement concretechimneysare

moreexpensivethan other forms of construction up toabout4Smheight butabovethis,they are verycompetitive.

Above65mheight,theyaremore readily

acceptablebecauseof theirflexibilityof shape andflue layouts, in additionto the absenceofanylimitationon size;and d)Brickchimneysare suitable in clay industriesfor use withintermittentkiln firingandwith veryhighexhaust gastemperatures. They arecheaperforsmaller heights butrequire regularatten tionand,therefore,involvehigher maintenancecost.

SECTION 1 DESIGN

5GENEllALCONSIDERATIONS

5.1Claal8eatioDofClallDDeys

Onthe basisof types of construction ofthe

shaft, the chimneysareclassifiedinto twotypes, maybelinedeitherovertheentireor part heiahtdependinguponthe temperature and/or agressivenessofthefluegases.The inletforthe fluegasesmaybe belowor above the groundlevel.

5.2SelectioDofChi.Dey

5.2.1In theselectionofchimneys, advantages

anddisadvantagesofsteelchimneysversus chimneyswithotherconstruction material,suchas reinforced cementconcrete/masonry should be consideredwith reference tooverall economy.Some of the important advantagesand disadvantages ofchimneysof different materials ofconstruction areasfollows:

4.21TunDonRatioofBoller

Ratiooffuelfiringatmaximumandminimum

loads. '-.20TheoreticalDraft

Thesuction thatwouldbeproducedat thebaseof a

chimneywithnoftuelosses.5.%.%Someof the importantfactorstobe considered in choosingthechimneyareas follows: chimneyisdesigned,including

II833(r.1):1Mt

4.10Helilitof01..,

It i.the di.tancebetweenthe centrelineof

theincomiD-'lueItreemtotbetoporthe chimney.Howeyerthe heilhtofchimney foratmosphericdispersionmodelliolsballbe takenalthedistancebetweentheafoundlevel andthe chimney'.top.

4.11HorlzolltalTo,Plate

Ahorizontal calt ironplatefittedtothe top

orthestructural shellcoveriDItbe area betweenitand theliners.

4.12Ia."Draft

Systemwhichmaintainsthe products ofcom

bustion,whenflownto orthroUlhit,at apro

4.13 M..RateofEalllioD

Emissionofpollutantsfromachimneyin terms

ofmassperunitof time.

4.14NataralDnft

Draftcreated in theboiler unitduetochimney

only.

4.15Nomi.alCbilDDeyDiameter

Internaldiameterat the topmost opening of

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