154838635 storage tank certification presentation
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resen e y ser em z
IndustryandCertificationDivision
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WHOWEARE
T RKLOYDUisanindependent,impartial
classification,
cer ca on,an conformityassesmentorganization.
WithitsMarineandIndustryDivisionsprovideswiderangeofservices;Classificationandstatutorysurveysofnewbuildingandexistingships,andcertificationofmarinematerialsandproducts.Thirdpartyinspections,CEmarkinginpressurevessels,systemcertifications,typeapprovalsaresomeofthebusinessesamongsttheothers.
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PHASES TO CERTIFICATION;
APPROVALOFPROJECTSAND
INSPECTIONOFFABRICATION
AND FINALTESTSQUALIFYINGOF
WELDINGPROCEDURESAND
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APPROVALOF
PROJECTS
AND
CALCULATIONS
ARE
EXECUTED
ACCORDING
TO
API
650,653
WealsouseCOADEsoftwaretoverifythecalculationsanddesign,
oana yse es ruc ureweuse program.
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BEFORECONSTRUCTIONOFATANKINTHEWORKSHOPANDINTHEPLANT
EXAMINATIONOF
QUALITYPLAN(ITP)
ISANESSENTIALSTEPNOTTOBEOVERLOOKED.
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QUALIFICATIONOFWELDINGPROCEDURES
WeldingprocedurequalificationrecordsmustmeettherequirementsofSectionIXoftheASMECode.Either AWSD1.1 or AWSD1.6 arealsoacceptablefor ladderand platformassemblies,handrails,stairways,andothermiscellaneous assemblies,butnottheirattachmentsto
.
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QUALIFICATIONOFWELDERS
Theweldersandweldingoperatorsmust bequalified inaccordancewithSectionIXoftheASMECode.
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INSPECTIONOFMATERIALS;
STEELPLATES
PROFILES
FLANGES
etc.
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MARKING
Toenablethevariousfabricatedcomponentstobeassembledtogethercorrectlyonsite,eachparthastobemarkedwithauniquenumbering
system.
Hardstampingmaybeusedaswell,butexceptfortheplateslessthan6mmthick.
Markingalso
provides
traceability
of
each
piece
of
material.
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AFTERFORMING
OF
SHELL
PLATES
RADIUSOFEACHPLATEMUSTBECHECKED
NOTTOSPENDMUCHTIMEDURINGTHISSTEP,APREFORMEDPATTERNMODEL
MADEOF
THIN
METAL
SHEET
CAN
BE
USED.
PRIMERSHOULDBEAPPLIEDBEFORETRANSPORTINGTHESHEETSTOPLANT,ANDINCASEOFNOTTOAFFECTTHEQUALITYOFWELDS,ALLWELDFACESSHOULDBE
.
INCASEANYDEFORMATIONMAYOCCURDURINGTRANSPORTANDSTACKING,
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CONCRETERINGWALL,
AND
BOTTOM
SURFACE
ARE
MEASURED
BY
MEANS
OF
TOTALSTATIONDEVICE.
ANCHORSARE
CHECKED
,MATERIALTYPELOCATION
Tensiletestisrequiredforeachpartyofsteelrodsusedintheconcrete
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BOTTOMPLATES
ARE
SETTLED
ACCORDING
TO
PLATE
ORIENTATION
SCHEME
IN
THE
APPROVEDPROJECT.
BOTTOMPLATESAREWELDEDAFTERCONSTRUCTINGOFCOARSES
LAPWELDEDBOTTOMPLATESUNDERTANK
SHELL
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TWOTYPES
OF
TANK
FLOORING
ARE;
BOTTOMDOWN:Generally,bottomdownisdesignforconerooftanks.Centreoftheflooringisinstalledwithdrainpit.Waterinthetankis accumulatedinthepit(lowestpointofthebottomplate/floor).
BOTTOMUP:Generally,thistypeofdesignisusedforfloatingrooftanks, 3to4collectorpitsareinstalled,closetotheshellplate. Eachofthepitisprovidedwithawaterdrawoffline.
Aslo e
of
1:120
is
suitable
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Theerectionprocedureshallincludethefollowingsteps:
(a)aholeshallbecutinthebottomplateorasumpshall
beplaced
in
the foundation
before
bottom
placement;
(b)aneatexcavationshallbemadetoconformtotheshapeofthedrawoffsump,thesumpshallbeput inplace,andthefoundationshallbecompactedaroundthesump
(c)the
sump
shall
be
welded
to
the
bottom.
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ADJUSTMENTOF
FIRST
COURSE
UPRIGHTNESS,ROUNDNESSANDDIAMETEROFTHECOURSEISMEASUREDMIN.AT8POINTS.
ITIS
CONSIDERED
THAT
THE
WELD
SEAMS
OF
BOTTOM
PLATES
AND
VERTICAL
SEAMSOFTHECOARSEARENOTTOBEINTERSECTEACHOTHER
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, . .
THEN,
VERTICAL
AND
CIRCUMFERENTIAL
WELDS
OF
THE
SECOND
COURSE
ARE
SUCHPRINCIPLEISFOLLOWEDFORTHEOTHERCOURSES.
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FOURTH
THIRD
FIRST
SECOND
COURSE
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TYPICAL ANCHORAGE
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TYPICAL ANCHORAGE
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, .THEN
VACUUM
TEST
IS
PERFORMED.
Vacuumtestingisperformedusingatesting boxapproximately150mm(6in.)wideby750mm(30in.)long withaclearwindowinthetop,whichprovidespropervisibility toviewtheareaunderinspection.
Durin testin ,illumination shallbeade uateforproperevaluationand interpretationofthe
test.
Theopenbottomshallbesealed againstthe. ,
valves,lightingandgauges,shallbeprovidedasrequired.
A soapfilm
solution
or commercial,
leak
detectionsolution, applicabletotheconditions,shallbeused.
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platestoshellplates.
method, oralternatively,byagreement betweenthepurchaserandthemanufacturer,usingtheultrasonic method.Inadditiontotheradiographic orultrasonicexamination theseweldsarealsovisuall examined.
Ingeneral,radiographic inspectionisrequiredforshellbuttwelds,annularplatebuttwelds,andflushtypeconnectionswithbuttwelds.
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TESTINGOF
THE
SHELL
Aftertheentiretankandroofstructureiscompleted,the shellis testedbyoneofthe
following methods:
1Ifwaterisavailablefortestingtheshell,thetankshallbe filledwithwateras follows:
itothemaximumdesignliquid level;iifor
atank
with
atight
roof,
to
50
mm
above
the
weld
connecting
the
roof
plate
or
compressionbar tothetopangleorshell
2
If
sufficient
water
to
fill
the
tank
is
not
available,
the
tank may
be
tested
by painting
a o e o n son e ns e w a g ypene ra ngo
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FIREPROTECTION
FireprotectionsystemshallbeestablishedaccordingtotheNFPAstandards.
Thiss stem
is
ins ected
durin
manufacturin
of
the
installation
and
after
that
functions,andperformanceareexamined.
Systemshallinclude;
Foambasedextinguishing,WatercoolingMonitorsDikeprotection
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FIREPROTECTION
Forthecoolingwaterratesthestandards donotprovidecogruentvalues.Theyonlyprescribeminimumwaterflowrates
API2030 :4.1 litersperminutepersquaremeterNFPA15 :10.5 liters/min.m2
IP19 :2 liters/min.m2
TobeonthesafesideforexposureprotectionwerecommendandapplyNFPArate.
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CATHODICPROTECTION
Bothsacrificialanodesystemorimpressedcurrentsystemareacceptable.
Themain
standard
for
this
ste
is
API
651.
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, .
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