Fpso Hull Integrity

7/23/2019 Fpso Hull Integrity

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FPSO HULL INTEGRITY

MURDJITODepartment of Ocean Engineering ITS, Gedung WA

Kampu ITS Su!o"i"o, Sura#a$a %&'''

e(mai") murd*ito+oeitacid


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RULES & REGULATIONS

Shipbuilding vs. Offshore Stndrds! piping

! sele"tion of #terils

! ""o##odtions! "ontrol & sfet$ s$ste#s

Sfet$

! I%O %OU s referen"e

! SOLAS li#ited to spe"ifi" ite#s not "overed b$%OU

! %AR'OL (ith unified interprettion for)'SO*s


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+ULL STRENGT+ ISSUES


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+ULL GIRER ,-ENING %O%ENT

A'AIT/


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+ULL GIRER ,0A1E S+EAR


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GLO-AL +ULL ESIGN !0A1E -% & S)

Still (ter loding "onditions often #ore severe for )'SO 0ve loding depends upon site environ#entl "riteri2

! hrsh environ#ent (ve -% nd S) re "lose to nd #$ e3"eed ShipRule re4uire#ents

! benign environ#ent (ve -% nd S) re less thn Ship Rules 5but notto be t6en less thn 789 of unrestri"ted servi"e Ship Rule

re4uire#ent: %ulti,site opertion #$ re4uire ssess#ent To(ing; inspe"tion nd te#porr$ "onditions to be "onsidered Rules re4uire ssess#ent of site spe"ifi" (ve loding 5


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E3#ple Trnsit "se 5-ong:


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-U.. STRE/GT- 0 1ATIGUE 1E MODE.S

rgo > bllst tn6 re

%ooring stru"ture nd hull integrtion 5turret nd>or"hinstoppers:

Riser por"hes nd supporting stru"ture

Topsides support stru"ture nd hull integrtion

)lre to(er support stru"ture

Offloding sttion support stru"ture

%in "rne pedestls nd support stru"ture

+elide"6 stru"ture

Additionl lo"tions depending on vessel fun"tion ndo(ners re4uire#ents


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ARGO TAN? %OEL

Lodings2! +ull girder S) & -%

! E3ternl pressure

! rgo lods

! Topside lods


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%OORING TURRET INTEGRATION

.oading)! %ooring s$ste# nd

risers

! +ull girder S) & -%

! Internl > e3ternlpressure


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TO'SIE SU''ORT STRUTURE

Grvit$ lodings +ull #otions +ull girder stresses +ull girder defle"tions


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-OTTO% SLA%%ING


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-O0 AREA I%'AT

Effe"ts for(rd botto# stru"ture )"tors ffe"ting sl# pressure2

! bluffness of bo(

! pit"h response > (ve length

! (ve steepness! (ve height

! bre6ing (ves

! loding "ondition 5drft:

%odel testing dvisble Rules "ontin re4uire#ents relting to drft;

pressure; e3tent nd s"ntlings


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GREEN SEAS !-O0 AN %AIN E?


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GREEN SEAS !%AIN E?

Tn6er heding off the (ves due to! 0ind! urrent

0ve "rest trvels long ships (etherside

Energ$ is "on"entrted 0ve height in"reses 0ter is shipped on the #in de"6 in

#idship se"tion

I#p"t on stru"tures nd e4uip#ent


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GREEN SEAS

)"tors ffe"ting green ses2! pit"h response > (ve length

! (ve steepness

! (ve height

! bre6ing (ves! loding "ondition 5drft:

! bo( shpe

Rules for ships in"orporte llo(n"es (ithin

design heds for superstru"tures; de"6houses;bul(r6s nd de"6s.

%odel testing dvisble


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SLOS+ING IN ARGO OIL TAN?S


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SLOS+ING IN ARGO OIL TAN?S

Sloshing is the d$n#i" #gnifi"tion of pressures(ithin "rgo>bllst tn6s

'rtil fillings the nor# for )'SOs 5NOT so for trding oiltn6ers:

Influen"ing )"tors2!

Tn6 si@e! +ull for#! Environ#ent > 0ethervning! Nturl periods of both vessel nd fluid! Tn6 fill levels

Sloshing nl$sis re4uired 5e.g. LR )LUIS: Anl$sis #$ result in n in"rese in s"ntlings t tn6

tops Restri"tions #$ be pl"ed on fill levels in "ertin tn6s


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AIENTAL LOAS

ollision due to suppl$ bot > shuttle

tn6er > i"eberg

ropped obe"t

E3plosion > blst

Ulti#te strength "riteri 5


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)ATIGUE !the proble#

The effe"t on #etl of repeted "$"les of stress. There is no obvious (rning; "r"6 for#s

(ithout ppre"ible defor#tion of stru"ture#6ing it diffi"ult to dete"t the presen"e ofgro(ing "r"6s.

)r"tures usull$ strt fro# s#ll ni"6s ors"rt"hes or fillets (hi"h "use lo"li@ed"on"entrtion of stress.

)ilure "n be influen"ed b$ nu#ber of f"tors

in"luding si@e; shpe nd design of the"o#ponent; "ondition of the surf"e or opertingenviron#ent.

)tigue life of stru"turl detils need to bessessed for )'SO


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)ATIGUE LI)E ASSESS%ENT

Identifi"tion of "riti"l res

etiled finite ele#ent nl$sis to ssess Stresson"entrtion )"tors

Site spe"ifi" nl$sis of d$n#i" lods

'revious servi"e histor$ to be ssessed 5for "onversions:

Sele"tion of S>N "urves! Other relevnt issues2

! thodi" prote"tion > "otings

! )bri"tion; tolern"es; (elding

! Inspe"tion > Inspe"tbilit$! Repir > stru"turl detil i#prove#ent

! )r"ture #e"hni"s ssess#ent

Note2 ftigue is highl$ sensitive to loding 5stress rnge:


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ECA%'LE )E% %ES+ ARRANGE%ENT TO

ETER%INE S)S


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)ATIGUE LI)E ,)ATORS O) SA)ET/


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T/'IAL RITIAL AREAS


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)A-RIATION TOLERANES AN 0ELING

Tolern"es should be in ""ordn"e (ith good

shipbuilding pr"ti"e; nd greed (ith lss

So"iet$

Spe"il ttention given to ftigue sensitive res Enhn"ed NE levels (ill be ne"essr$ for

identified ftigue sensitive res

Assu#ptions used in nl$ti"l ftiguessess#ents to be "onsistent (ith "onstru"tion


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)'SO )ATIGUE EN+ANE%ENT ETAILS ON1ERSION


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IN SER1IE SUR1E/ 'ROGRA%

Sour"e 2! developed b$ the o(ner > opertor ginst list

of surve$ble ite#s

! Surve$ pln to be pproved b$ lss To ddress 2

! lss re4uire#ents

! Regultor$ re4uire#ents! Overll hull stru"ture "onfigurtion & "riti"l

res


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STRUTURAL INS'ETION

rried out on lo"tion

'rovides dete"tion > #onitoring "p"it$

Annul; inter#edite & #or surve$s

%or surve$ 5D $ers or "ontinuous: I0S in lieu of dr$ do"6ing

Internl surve$ "onsidertions2! "lening & gs freeing

! ""ess rrnge#ents>sfet$

! Lighting > ventiltion

! loding "onditions for strength


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IN 0ATER SUR1E/S

Re4uire#ents for OI0S* nottion

! thodi" prote"tion nd high resistn"e pint

! Under(ter #r6ing

! Tn6 inspe"tion "onditions in"luded in hull

girder nl$sis

! 1enting>isoltion rrnge#ents for tn6 entr$

!Arrnge#ents "onsidered for surve$>"hnge,out of thrusters; se "hests; rudder bering

et".


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'er#nent %ens of A""ess 5'%A:

SO.AS re2uirement for ne3#ui"d

4ee"

!All internl tn6s

! Eli#inte need for stging; rfting or rope

""ess

!A""ess for "lose up e3#intion

! Utilise tn6s stru"turl #e#bers; or provide

dedi"ted rrnge#ents! Stndrds for ldders; hndrils; et"

! 'ortble e4uip#ent #$ be used for so#e


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SOLAS 'er#nent %ens of A""ess 5'%A:


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GENERAL LI)E O) )IEL ISSUES

+olisti"* ppro"h for good integrted solution Offshore insted of Ship #intenn"e philosoph$ esign for ""identl lods; in"luding (ve i#p"t o#ptibilit$ of hull stru"turl; s$ste#s nd topsides !

interf"e design

)tigue esign 5& life to dte for "onversions: 'rodu"tion e4uip#ent for e3tre#e (ether "onditions %rine e4uip#ent robustness; prti"ulrl$ "rgo>bllst

s$ste#s OI0S* re4uire#ents nd "orrosion prote"tion A""ess 5operbilit$ > #intinbilit$ > inspe"tbilit$: In,servi"e surve$ !effe"t on do(nti#e 'rovision of spre prts


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)'SO INIENT +ISTOR/

E3#ples of proble#s

-u"" Structure

! Lo"lised ftigue filure

! bo( (ve i#p"t d#ge

! shuttle tn6er "ollision

! tn6 overpressuristion

! se(ter "isson preferentil "orrosion

! integrtion of surf"e nd subse "orrosion

prote"tion


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)'SO INIENT +ISTOR/ ,STATISTIS 5RE'ORTE:


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T/'IAL A%AGE


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ECA%'LES O) INTERNAL 0ELE RE'AIRS


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)'SO -O0 0A1E I%'AT A%AGE


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)'SO RULE A%EN%ENTS )OR )ORE EN

STRUTURES

-sis ,Ship Rule re4uire#ents using #in.

servi"e speed

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Fpso Hull Integrity